JPH09160939A - Device for simulating pipeline of water supply - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily convert the display between a data table and a pipe-line distribution chart displayed on a screen by displaying a pipeline diagram for designating a specific name out of names displayed on a data table and displaying a position corresponding to the specific name on the pipeline diagram in an emphasized state. SOLUTION: When a specific line out of lines related to names displayed on a node data table is designated with a mouse 5 in the displayed state of the node data table on a screen, a water pressure distribution chart as a pipeline diagram is displayed on the screen and a node name related to the specific line is acquired. A specific position on the pipeline diagram is retrieved by the node name and the specific position on the pipeline diagram corresponding to the specific node name in the node data table is displayed so as to be emphasized by a color different from a color corresponding to other nodes. Consequently, the display conversion between the data table and the pipeline distribution chart displayed on the screen can easily be executed.

Description

Detailed Description of the Invention

[0001]

INDUSTRIAL APPLICABILITY The present invention makes it possible to easily carry out display conversion between a data table displayed on a screen and a pipe network diagram, and the flow velocity distribution and flow direction on the pipe network diagram. The present invention relates to a water supply network simulation device capable of easily recognizing changes.

[0002]

2. Description of the Related Art Conventionally, a pipe network simulation device for water supply has a node input data related to a node as a junction / branch point of each pipe and a calculation result calculated by the pipe network based on the node input data. To create a node data table by relating each of the node names to each of the node names, and assign the pipeline input data related to each pipeline and the calculation result calculated by the pipeline network based on the pipeline input data to each pipeline name. Create a pipeline data table in relation to
In addition to displaying these data tables on the screen, the connection relationship between each pipeline and each node is displayed as a pipeline network diagram.

[0003]

However, in this conventional pipe network simulation apparatus, when a pipe network diagram is displayed on the screen, attention is paid to a specific node or pipe line, and a data table is displayed from this state. When changing the display to the state displayed in, it is not possible to recognize at a glance where in the data table the specific node or pipeline exists, and conversely, when the data table is displayed on the screen. In addition, paying attention to a specific node or pipeline, when changing the display from this state to the state in which the network diagram is displayed on the screen, in which part of the network diagram the specific node or pipeline is located. There is an inconvenience that you cannot recognize at a glance. Moreover, in the conventional pipe network simulation device, the pipe network calculation is performed based on a plurality of water demand sets to obtain the flow velocity flow distribution and flow direction change of each pipeline. There is an inconvenience that it cannot be recognized at a glance on the network diagram.

The present invention has been made in view of the above circumstances, and it is possible to easily perform display conversion between a data table displayed on a screen and a distribution map of a distribution network, and a distribution network. An object of the present invention is to provide a water supply pipe network simulation device capable of easily recognizing the flow velocity / flow distribution and the change in flow direction on the figure.

[0005]

In order to solve the above-mentioned problems, a water supply pipe network simulation apparatus according to claim 1 of the present invention inputs a node relating to a node as a confluence / branch point of each pipeline. A node data table is created by associating the data and the calculation result of the network calculation based on the node input data with each node name, and the pipeline input data related to each pipeline and the pipeline input data. A data table creating means for creating a pipeline data table by relating the calculation result calculated by the pipeline to each pipeline name, and the pipeline by graphically showing the connection relationship between each pipeline and each node. A network diagram creating means for creating a diagram and a distribution chart of the calculation results, a display selecting means for selecting and displaying the network diagram and the data table on the screen, and a data table displayed on the screen. Is displayed in the data table when When a specific name of the specified names is designated, the network diagram is displayed, and the location corresponding to the specific name on the network diagram is highlighted, and when the network diagram is displayed on the screen. And a display changing means for displaying a data table corresponding to the specified location on the screen when the specific location on the network diagram is designated and highlighting the name corresponding to the specific location.

In order to solve the above-mentioned problems, a water supply pipe network simulation apparatus according to a second aspect of the present invention is provided with a plurality of water input in relation to each pipe line and a node as a confluence / branch point thereof. Network calculating means for calculating a network based on the demand volume set, and a low flow rate pipeline for extracting a pipeline having a predetermined value or less for any of the demand volume sets out of the flow rate obtained by the pipeline calculation. Extraction means, flow direction changing pipe line extraction means for extracting pipes whose flow direction changes according to the demand set, and a network for creating a pipe network diagram by graphically showing the connection relationship between each pipe and each node Based on the extraction result of the drawing creation means and the low-velocity pipeline extraction means, the flow-rate / flow-velocity diagram identification display means for identifying and displaying the low-velocity pipeline in the network diagram, and the extraction result of the flow-direction change pipeline extraction means Based on the above-mentioned network diagram, the flow direction change pipelines are identified and displayed. That flow and a direction change identification unit.

[0007]

According to the water supply pipe network simulation apparatus of the first aspect of the present invention, the data table creating means produces the nodal point input data and nodal point input data related to the nodal points as the merging / branching points of the respective pipelines. Create a node data table by associating the calculation result calculated based on the above with each node name, and calculate the pipe network based on the pipeline input data related to each pipeline and the pipeline input data. A pipeline data table is created by relating the results and each pipeline name. Pipe network diagram creation means
The connection relationship between each pipeline and each node will be plotted to create a pipe network diagram and the calculation results will be plotted as a distribution chart. The display selecting means selects and displays the network diagram and the data table on the screen. The display changing means displays the network diagram when the specific name among the names displayed in the data table is specified while the data table is displayed on the screen, and also corresponds to the specific name on the network diagram. If you specify a specific location on the network diagram when the network diagram is displayed on the screen, the data table corresponding to this location will be displayed on the screen and the name corresponding to the specific location will be displayed. Is highlighted.

According to the water supply pipe network simulation apparatus of the second aspect of the present invention, the pipe network calculation means is provided with a plurality of water input in relation to each pipe line and a node as a junction / branch point thereof. Pipe network calculation is performed based on the demand set of The low-velocity pipeline extracting means extracts pipelines whose flow velocity obtained by the pipeline calculation is equal to or less than a predetermined value for any demand amount set. The flow direction changing pipe line extracting means extracts a pipe line whose flow direction changes according to the demand amount set. The pipe network diagram creating means creates a pipe network diagram by visualizing the connection relationship between each pipeline and each node. The flow rate / velocity diagram identification display means identifies and displays the low flow rate pipeline on the network diagram based on the extraction result of the low flow rate pipeline extraction means. The flow direction change identification display means identifies and displays the flow direction change pipeline in the network diagram based on the extraction result of the flow direction change pipeline extraction means.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a schematic diagram of a water supply pipe network simulation apparatus according to the present invention. In FIG. 1, 1 is a computer, 2 is a display, 3 is a hard disk as an external storage device, and 4 is Keyboard, 5
Is a mouse and 6 is a printer. Various programs related to the pipe network simulation are installed in the computer 1. When the power supply of the computer 1 is turned on, the water supply pipe network simulation apparatus displays the menu screen shown in FIG. On the menu screen, data input, input end, pipe network drawing, pipe network calculation, water pressure distribution drawing, flow velocity display, stagnant water simulation, water multiple demand set data creation, manual correction, correction end, flow direction change display, etc. Command items are displayed, and screen page selection items are displayed at the bottom of the menu screen. There are nine types of screen page selection items, and when the content described in the screen page selection item is clicked on with the mouse 5, a screen related to the content is displayed.

On the menu screen, when the tip of the arrow-shaped cursor is moved to the command item and the mouse 5 is clicked, the program having the contents corresponding to the command item is activated and the contents are executed. For example, when data input is clicked and designated, a message to input the data name, number of nodes, number of pipelines, number of water sources, etc. is displayed, and the operator follows the message and uses the keyboard 4 to input the data name. Enter the number of nodes, the number of pipelines, and the number of water sources. Here, the number of nodes is 48, the number of pipelines is 73, and the number of water sources is 3. Next, the node data of the screen page selection item is clicked and designated by the mouse 5 to display the screen for creating the node data table shown in FIG. 4, and the keyboard 4 is used to display the node name, head of water source, water demand, elevation, X Enter the coordinates and Y coordinate. In addition, in the node data table creation screen shown in FIG.
Before data input, input data, NO and numerical value related to this NO, node name, head of water source, demand, elevation, X coordinate,
Items such as Y-coordinates, marks to be described later, calculation results, water source inflows, etc. are displayed, and actual values of input data and output data as calculation results are not displayed. Then, the pipeline data of the screen page selection item is clicked and designated by the mouse 5 to display the pipeline data table creation screen shown in FIG. 5, and the keyboard 4 is used to display the pipeline name, the start node, the end node, Enter the demand amount, pipe type, flow velocity coefficient, pipe extension, pipe diameter. In the pipeline data table creation screen shown in FIG. 5, before data input, input data, NO and numerical values related to this NO, pipeline name, start node, end node, demand amount, pipe type, flow velocity coefficient, Items such as pipe extension, pipe diameter, marks to be described later, calculation results, flow rate, head loss, and flow velocity are displayed, but actual values of input data and output data as calculation results are not displayed. After finishing the input work, click the end input and click to draw the pipe network diagram. Then, the pipe network diagram creating means is executed and the connection relationship between each pipeline and each node is diagrammed. In addition, when the pipe network calculation is clicked and specified on the menu screen, the data table creating means program is executed, and the node input data related to the node as a confluence / branch point of each pipeline and the pipe input data are used. A node data table is created by relating the net-calculated calculation results to each node name, and the pipeline input data related to each pipeline and the calculation results calculated based on the pipeline input data Is associated with each pipeline name, and a pipeline data table is created.

That is, when the pipe network calculation is clicked and designated by the mouse 5 on the menu screen shown in FIG. 2, the flow shown in FIG. 3 is executed to read the node data (S.
1), the pipeline data is read (S.2), and the graph analysis by the mesh and the adjacent mesh is performed (S.2).
3). Then, the structural solution of the pipe network equation is executed (S.4), and the graph analysis result and the structural solution result are written to the external storage device 3 as an intermediate result file (S.5). Next, the initial value of the mesh flow rate is set (S.6), the head difference and variational resistance calculation of each pipeline are executed by the Newton-Raphson method (S.7), and whether the head closing condition is satisfied. Whether or not it is determined (S.8), when the result is NO, matrix coefficient calculation is executed (S.9), and then
The linear equation is solved (S.10), and S. 7-S.
The processing of 10 is executed until the head closing condition is satisfied,
S. When the answer is YES in 8, the node data table is displayed first, and the numerical values in each column of the calculation result are sequentially displayed, and then the pipeline data table is displayed and the numerical values in each column of the calculation result are sequentially displayed. The calculation result is displayed (S.11), the pipe network calculation process ends, and the screen returns to the menu screen shown in FIG.

The mesh flow rate method itself is, for example, a paper entitled "High-speed calculation of large-scale pipe network and high accuracy by pipeline extraction model" in Waterworks Association Magazine No. 53 No. 12 (No. 603). Although it is well known in the art, a little supplementary explanation will be given below.

In the mesh flow rate method, an algebraic equation having a mesh flow rate as a variable is solved. If this mesh flow rate is obtained, the flow rate in the pipeline and the pressure at the node can be calculated. This algebraic equation is a non-linear algebraic equation because the flow rate and the head loss (water pressure) have a non-linear relationship. That is, the empirical formula hi = ri · Qi · | Qi | ^{0.85 of} Basen Williams becomes non-linear.

Here, Qi is the flow rate of the pipe i, and ri is the resistance coefficient of the pipe i determined by the flow velocity coefficient, the pipe diameter and the pipe length.

To solve this non-linear algebraic equation, the Newton-Raphson method is used. The Newton-Raphson method linearizes the non-linear equation and repeats the procedure for solving this linear equation until the solution converges. In the case of calculation, it will be repeated until the head closing condition of all meshes is satisfied. Here, when the nonlinear equation is linearized, the Jacobian matrix having the variation resistance of the mesh as an element appears as the coefficient of this linear equation. This Jacobian matrix has a very small percentage of non-zero elements when the scale of the pipe network increases. In other words, most of the matrix elements have a value of "0". Therefore, when solving a linear equation using such a matrix, if the normal sweep-out calculation is performed, the calculation speed becomes very slow and the processing efficiency decreases. Therefore, a method is adopted in which the values of only the non-zero elements of the matrix are stored in the memory and the sweep calculation is executed only for the values of the non-zero elements.

For example, CA (I) is a pointer indicating the storage position for storing the start of the value of the non-zero element of the I-th row in the memory, JA (J) is the column number of the non-zero element, and A
(J) is the value of the non-zero element corresponding to JA (J),
If you store the following determinant,

[Equation 1] In the pipe network calculation, since the matrix is symmetrical with respect to the diagonal line, only the upper right triangular portion is stored in the memory in the format shown below.

[0017]

(Equation 2) In this format, the numbers 1, 3, 5, and 7 simply indicate the storage locations in the memory, and the numerical value itself has no specific meaning.

When the sweep-out calculation is performed on the matrix stored in such a format, the element whose value is 0 at first is non-zero.
Comes out with the value of. In such a case, it is necessary to secure a memory storage area in the same format for the newly generated non-zero element and make that value available for subsequent sweep calculations, which is a troublesome process. However, if the structure of the pipe network is the same, even if the values of demand, pipe diameter, and pipe length are changed, in the Jacobian matrix, "0"
(The property that the position of the element with the value of does not change)
If it is used, it is not necessary to perform this process each time in the iterative calculation of the Newton-Raphson method, it is only necessary to perform this process once in advance, and the result is stored in the external memory 3 as an intermediate result. This is called structural solution. .

If this structural solution is performed once, in the iterative calculation of the Newton-Raphson method using this result, only the numerical sweep-out calculation is required, and the calculation time can be shortened. Regarding the mesh flow rate, the value of the mesh flow rate when the pipe network simulation is performed for the reference demand amount is saved and used as the initial value of the mesh flow rate when performing the stagnant water simulation described later. For example, the total sum of the standard demands is D ₀ , the total sum of the demands of a certain demand set of the stagnant water simulation is D 1, and the mesh flow rate value m ₀ when the pipe network simulation is performed on the standard demands. (I). Here, the code I means the I-th mesh.
At this time, the initial value m ₁ (I) of the mesh flow rate when performing the pipe network simulation for the demand amount set is obtained by the following formula.

M ₁ (I) = m ₀ (I) × D ₁ / D ₀ If the distribution ratio of the demand amount to each node is similar between the reference demand amount and the demand amount set to be calculated, the final Since the initial value is close to the value, the number of iterations of the Newton-Raphson method can be reduced and the calculation time can be similarly shortened.

That is, when solving an algebraic equation by the Newton-Raphson method, it is necessary to give an initial value to the mesh flow rate, which is a variable. However, if an initial value that is as close as possible to the final value is given, the number of calculations can be saved. .

Therefore, if this structural solution is performed, it is possible to speed up the pipe network calculation time when creating a plural demand set table which will be described later.

Next, on the menu screen, for example, when a pipe network diagram is drawn or a pipe network diagram is selected as a screen selection item, the pipe network diagram shown in FIG. 6 is displayed on the screen. In FIG. 6, □ (square mark) means a water source, and ○ (circle mark)
Means a node as a merging / branching point of a pipeline, and → (arrow) means each pipeline. In addition, for example, on the menu screen, the node data of the screen page selection item is displayed by the mouse 5
When you click to specify, numerical values of absolute head and effective head as calculation results are displayed together with the input data as a list as shown in FIG. 4. When you click and specify the conduit data of the screen page selection item with the mouse 5, As shown in, the calculated flow rate, head loss, and flow velocity are displayed together with the input data. Further, for example, when the water pressure distribution drawing is clicked on the menu screen, a water pressure distribution map as a pipe network diagram is drawn on the screen as shown in FIG.
Functions as a selection display unit for selecting and displaying a network diagram on the screen. Further, when the flow rate / velocity table drawing is clicked on the menu screen, a flow rate / velocity diagram is drawn on the screen as shown in FIG.
It is identified and displayed as 1.

As shown in FIG. 7, when a mouse 5, for example, selects a node as a specific portion (object) indicated by the reference numeral N1 on the screen where a water pressure distribution map is displayed as a pipe network diagram (see FIG. 9). No. S1), the node data table corresponding to this particular place N1 is displayed on the screen, and the name corresponding to this particular place N1 is acquired (see S2 in FIG. 9). The name corresponding to the specific place N1 is searched (see symbol S3 in FIG. 9), and the line related to the name N1 is highlighted as shown by the hatched line in FIG. 4 (see symbol S4 in FIG. 9). Further, as shown in FIG. 7, on a screen where a water pressure distribution map as a pipe network diagram is displayed, for example, when a pipeline as a specific portion (object) indicated by reference symbol P1 is selected (see reference symbol S1 in FIG. 9). ), The pipeline data table corresponding to this specific location P1 is displayed on the screen, and the name corresponding to this specific location P1 is acquired (see reference numeral S2 in FIG. 9). The name corresponding to P1 is searched (see symbol S3 in FIG. 9), and the line related to the pipeline name is highlighted as shown by the hatched line in FIG. 5 (see symbol S4 in FIG. 9).

Then, when the node data table shown in FIG. 4 is displayed on the screen, a specific row N1 of the rows related to the name displayed in the node data table is designated by the mouse 5 ( (See reference numeral S1 in FIG. 10), the water pressure distribution diagram as the pipe network diagram shown in FIG. 7 is displayed on the screen, and the node name N1 related to the specific row N1 is acquired (see reference numeral S2 in FIG. 10). , A specific portion N1 of the network diagram is searched by this node name N1 (reference numeral S3 in FIG. 10).
), The specific location N1 on the network diagram corresponding to the specific node name N1 in the node data table is highlighted in a color different from the colors for the other nodes (see symbol S3 in FIG. 10). Further, in the state where the pipeline data table shown in FIG. 5 is displayed on the screen, when a specific row P1 of the rows related to the name displayed in the pipeline data table is designated (reference numeral S1 in FIG. 10). 8), the flow velocity diagram as a network diagram shown in FIG. 8 is displayed on the screen, and the pipeline name N1 related to the specific row P1 is acquired (see symbol S2 in FIG. 10). A specific location P1 on the network diagram is searched by the name N1 (see reference numeral S3 in FIG. 10), and the specific location P1 on the network diagram corresponding to the specific pipeline name P1 in the pipeline data table is changed to another location. It is highlighted in a color different from the color for the conduit. Therefore, the mouse 5 displays the network diagram when the specific name among the names displayed in the data table is specified when the data table is displayed on the screen, and the mouse 5 displays the specific name on the network diagram. If you highlight the corresponding part and specify a specific part on the network diagram when the network diagram is displayed on the screen, the data table corresponding to this part will be displayed on the screen and the specific part will be displayed. It functions as a display changing means for highlighting the name.

Next, assuming that the standard demand amount has already been input, when the user clicks to create multiple demand amount data on the menu screen, the number of demand sets, the maximum coefficient value, and the minimum coefficient value are input. A message to the effect that it should be displayed, etc., and the operator follows the message to enter the number of demand sets, the maximum coefficient value, and the minimum coefficient value on the keyboard 4
Enter by. Next, when the node data 2 of the screen selection item is clicked with the mouse 5, the screen is automatically switched to the node data table creation screen shown in FIG. 11, and the water demand is automatically created for each set. Here, four sets of water demand are input. The absolute head and effective head columns remain white columns until the stagnant water simulation described below is executed. Next, in the screen shown in FIG. 11, when the pipeline data 2 of the screen selection item is clicked with the mouse 5, the pipeline data table creation screen is automatically switched,
Water demand is automatically created for each set. Again, four sets of water demand should be entered,
The column for inputting the demand amount for the fourth set of water is outside the screen, and when the column for displaying the demand amount for the fourth set of water is displayed on the screen, the screen is scrolled to the left. It should be noted that here, since the demand amount when water is taken out from each node is considered and the demand amount when water is taken out from each pipeline is not considered, it is set to “0”. The columns of flow rate, head loss, and flow velocity remain white columns until the stagnant water simulation described below is executed.

Returning to the menu screen shown in FIG. 2, when the stagnant water simulation is clicked by the mouse 5, the flow shown in FIG. 13 is executed and a plurality of demand amount sets are input (S1). The intermediate result file is read from the external storage device 3 (S2), the initial value of the mesh flow rate is set (S3),
The solution by the Newton-Raphson method is executed for one demand amount set (S4), and it is determined whether or not the calculation of all demand amount sets is completed (S5). Here, since the demand amount set is 4, the pipe network calculation is executed four times.
Then, for any demand amount set among the flow velocities obtained by the pipe network calculation, a pipe line having a predetermined value or less is extracted, and a pipe line whose flow direction changes according to the demand amount set is extracted (S .6) First, the demand amount set table for the nodes is displayed, and the numerical values in each column of the calculation result are sequentially displayed. Then, the demand amount set table for the pipeline is displayed, and the numerical values of the respective columns of the calculation result are displayed. The calculation result display (S7) of sequentially displaying is performed, the pipe network calculation processing ends, and the screen returns to the menu screen shown in FIG. Therefore, the mouse 5 and the stagnant water simulation program function as a low flow velocity conduit extracting means and a flow direction changing conduit extracting means. Here, the change in the flow direction means that the direction of the water flow for one demand amount set and the direction of the water flow for another demand amount set are opposite in the same pipeline.

Next, returning to the menu screen shown in FIG. 2,
When the flow direction change display is clicked and designated by the mouse 5, the flow direction change diagram shown in FIG. 14 is displayed, and the pipeline showing the flow direction change is identified and displayed as a diamond-shaped mark M2.
Note that in FIG. 11, the absolute head and effective head data of set 4 are outside the screen, and in FIG. 12, a part of the head loss, flow velocity, flow rate of set 4, head loss, and flow velocity of set 3 are displayed on the screen. These are outside, but when you scroll the screen to the left, the numerical values are displayed on the screen.

[0029]

According to the pipe network simulation apparatus of the first aspect of the present invention, the display conversion between the data table displayed on the screen and the pipe network distribution map can be easily achieved. Has the effect.

According to the water supply pipe network simulation device of the second aspect of the present invention, the pipe network calculation is performed based on a plurality of demand sets of water to obtain the flow velocity flow distribution and flow direction change of each pipeline. At this time, there is an effect that the flow velocity / flow rate distribution and the flow direction change can be recognized at a glance on the pipe network diagram.

[Brief description of the drawings]

FIG. 1 is a diagram showing an overall configuration of a water supply pipe network simulation apparatus according to the present invention.

FIG. 2 is a diagram for explaining the contents of a menu screen displayed on the screen of the display shown in FIG.

FIG. 3 is a flowchart showing an example of a pipe network calculation.

4 is a diagram showing an example of a node data table displayed on the screen of the display shown in FIG.

5 is a diagram showing an example of a pipeline data table displayed on the screen of the display shown in FIG.

6 is a diagram showing an example of a network diagram displayed on the screen of the display shown in FIG.

FIG. 7 is a diagram showing an example of a water pressure distribution map displayed on the screen of the display shown in FIG.

8 is a diagram showing an example of a flow velocity / flow rate diagram displayed on the screen of the display shown in FIG. 1. FIG.

FIG. 9 is a flowchart showing an example of a jump from a network diagram to a data table.

FIG. 10 is a flowchart showing an example of a jump from a data table to a network diagram.

FIG. 11 is a diagram showing an example of a multiple demand amount data table for nodes displayed on the screen of the display shown in FIG. 1.

FIG. 12 is a diagram showing an example of a plural demand amount data table for a pipeline displayed on the screen of the display shown in FIG. 1.

FIG. 13 is a flowchart showing an example of stagnant water simulation according to the present invention.

14 is a diagram showing an example of a flow direction change diagram displayed on the screen of the display shown in FIG.

[Explanation of symbols]

 1 ... Computer 2 ... Display 3 ... External storage device 4 ... Keyboard 5 ... Mouse

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Ryuichi Matsuki 4-14-31 Nakamuneoka, Shiki City, Saitama Prefecture (72) Shinichiro Miyaoka 8333 Ohkuno, Hinode-cho, Nishitama-gun, Tokyo

Claims (4)

[Claims] 1. A nodal data table is obtained by correlating nodal input data related to a nodal point as a merging / branching point of each pipeline and a calculation result calculated by a pipe network based on the nodal input data with each nodal name. A data table for creating a pipeline data table by creating pipeline data related to each pipeline and a pipeline network calculation result calculated based on the pipeline input data to each pipeline name. A means for creating, a network diagram creating means for graphically representing the connection relationship between each of the pipelines and each of the nodes, and for creating a distribution chart of the calculation results, and selecting the network diagram and the data table on the screen. When the display selection means to be displayed and a specific name among the names displayed in the data table when the data table is displayed on the screen are specified, the network diagram is displayed and the network diagram is displayed. Highlighting the part corresponding to the specific name of When a particular location on the network diagram is specified while the network diagram is displayed on the screen, a data table corresponding to the location is displayed on the screen and the name corresponding to the particular location is highlighted. A pipe network simulation device for water supply, comprising display changing means. 2. Pipe network calculation means for performing a pipe network calculation based on a set of a plurality of demands of water input in relation to each pipe and its joint / branch node, and said pipe network calculation means. Of the obtained flow velocity, for any demand volume set, a low flow velocity pipe line extracting means for extracting pipe lines having a predetermined value or less,
Flow direction changing pipe line extracting means for extracting a pipe line whose flow direction changes according to the demand amount set, and a pipe network diagram creating means for creating a pipe network diagram by graphically showing the connection relationship between each pipe line and each node. And a flow rate flow velocity map identification display means for identifying and displaying the low flow velocity pipeline in the pipe network diagram based on the extraction result of the low flow velocity pipeline extraction means, and the pipe based on the extraction result of the flow direction change pipeline extraction means. A pipe network simulation device for water supply, comprising: flow direction change identification display means for identifying and displaying flow direction change pipelines on a network diagram. 3. The pipe network calculation means is a mesh flow method, and the result of structurally solving the pipe network equation of the mesh flow method is stored in a memory as an intermediate result and for a specific demand set. Saving the obtained mesh flow rate calculation result in the memory and executing the calculation for multiple demand sets using the initial value of the mesh flow rate created from the intermediate result and the mesh flow rate calculation result reduces the execution time. The pipe network simulation device for water supply according to claim 2, wherein 4. A demand quantity set table for creating a plurality of water demand quantity set tables related to the names of respective nodes and a plurality of water demand quantity set tables related to the names of the respective pipelines. The means according to claim 2, further comprising: means for changing the display state of the screen between the demand amount set table displayed on the screen and the network diagram displayed on the screen. Water supply pipe network simulation device.