JP2014119395A - Tuft test alternate device, tuft test alternative method, and tuft test alternative program - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a tuft test alternate device in which a PIV device may be used as an alternative for a tuft test.SOLUTION: The tuft test alternate device includes: a time average calculation unit which calculates time average of respective flow velocity vectors of a plurality of measure points on each of a plurality of periods and generates time average data; and a data generating unit which generates image data displaying each time average data of the plurality of periods in chronological order as tuft alternative data.

Description

  The present invention relates to a tuft test alternative device and a tuft test alternative method.

  Tuft tests may be performed to visualize the airflow.

  FIG. 1 is a schematic diagram illustrating an example of a tuft test. As shown in FIG. 1, in order to perform a tuft test, a plurality of tufts 16 (silk threads) are attached to a plurality of supports 15 (for example, piano wires). The plurality of tufts 16 are attached in a lattice shape. Each of the plurality of tufts 16 is light enough to ignore the weight. Each tuft 16 moves following the airflow. The movements of the plurality of tufts 16 indicate airflow. Thereby, airflow can be visualized.

  On the other hand, as another method for visualizing an airflow, a method using a PIV (Particle Image Velocity) device is also known.

  In relation to the above, Patent Document 1 (Japanese Patent Laid-Open No. 2000-155124) discloses a visualization device for airflow measurement. This visualization device for airflow measurement is provided with a water tank, a tracer generator for generating mist as a tracer by ultrasonic waves, and connected to the tracer generator, and a plurality of jet holes are provided at predetermined intervals in the longitudinal direction. A tracer jet pipe, a long light source with a reflector that is integrally and vertically provided directly below the tracer generating portion, and condenses and emits visible light in the direction of the tracer jet pipe, the tracer jet pipe, and the reflector And a leg portion for setting the long light source at a predetermined height position in the measurement chamber.

JP 2000-155124 A

  In order to perform a tuft test, it is necessary to assemble a test device and install it in the measurement part. Adjustment is required each time the measurement area is changed. Therefore, time is spent preparing for the test. Moreover, even if instantaneous data and averaged data can be displayed with the PIV, it is difficult to obtain a moving image similar to the tuft test because of the high resolution of the PIV.

  Therefore, the present inventors have considered using the PIV device as an alternative to the tuft test by solving various difficulties. If a PIV device can be used instead of a tuft test, the burden on test preparation can be reduced.

  In the PIV apparatus, a flow velocity vector at each of a plurality of measurement points set in the measurement region is obtained based on the captured image of the measurement region. Then, image data indicating a flow velocity vector at each measurement point is obtained. The inventors of the present application considered using the PIV apparatus as an alternative to the tuft test by displaying the obtained flow velocity vector image data in time order.

  However, the PIV device has a higher time resolution than the tuft test. Therefore, the obtained image data of the flow velocity vector includes high frequency components that are not reflected in the tuft test. Therefore, there is a problem that it cannot be used as an alternative to the tuft test as it is.

  Therefore, an object of the present invention is to provide a tuft test alternative device and a tuft test alternative method in which a PIV apparatus can be used as an alternative to a tuft test.

  A tuft test alternative device according to the present invention obtains time series data of PIV data obtained by a PIV (Particle Image Velocity) device, and simulates a tuft test result based on the PIV data acquisition unit and the PIV data. A tuft substitute data generating unit for generating tuft substitute data. The PIV device acquires captured images of a measurement region in which a tracer is introduced at different times, and an image data acquisition unit, and a plurality of measurement points set in the measurement region based on the acquired captured images. A PIV data generation unit that calculates a flow velocity vector and generates data indicating the calculation result as the PIV data. The tuft substitute data generation unit calculates a time average of flow velocity vectors of the plurality of points for each of a plurality of periods, and generates time average data. A data generation unit configured to generate, as the tuft substitute data, image data that displays each time-averaged data in order of time.

  A tuft test alternative method according to the present invention includes a step of obtaining time series data of PIV data obtained by a PIV (Particle Image Velocity) device, and tuft substitute data that simulates tuft test results based on the PIV data. Generating. The PIV device acquires captured images of a measurement region in which a tracer is introduced at different times, and an image data acquisition unit, and a plurality of measurement points set in the measurement region based on the acquired captured images. And a PIV data generation unit that calculates a flow velocity vector for and generates data indicating a calculation result as the PIV data. The step of generating the tuft substitute data includes calculating a time average of each flow velocity vector of the plurality of points for each of a plurality of periods, generating time average data, and a time of each of the plurality of periods. Generating image data for displaying average data in time order as the tuft substitute data.

  According to the present invention, a tuft test alternative device and a tuft test alternative method that can use a PIV device as an alternative to a tuft test are provided.

FIG. 1 is a schematic diagram illustrating an example of a tuft test. FIG. 2 is a schematic diagram showing a tuft test alternative system according to the first embodiment. FIG. 3 is a schematic diagram showing PIV data. FIG. 4 is a block diagram illustrating the tuft substitute data generation unit. FIG. 5 is a flowchart showing the operation method of the tuft test alternative device. FIG. 6 is a conceptual diagram showing an example of time average data. FIG. 7 is a block diagram illustrating the tuft substitute data generation unit. FIG. 8 is a flowchart illustrating an operation method of the tuft test alternative device according to the second embodiment. FIG. 9 is a conceptual diagram illustrating an example of PIV data. FIG. 10 is a diagram illustrating the converted PIV data. FIG. 11 is a block diagram illustrating a tuft substitute data generation unit according to the fourth embodiment. FIG. 12 is a flowchart showing an operation method of the tuft test alternative device. FIG. 13 is a conceptual diagram illustrating an operation method of the data generation unit. FIG. 14 is a block diagram illustrating the tuft substitute data generation unit. FIG. 15 is a schematic diagram for explaining an operation method of the spatio-temporal average calculation unit.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

(First embodiment)
FIG. 2 is a schematic diagram showing the tuft test alternative system 1 having the tuft test alternative device 3 according to the present embodiment. The tuft test alternative system 1 includes a PIV device 2 and a display device 4 in addition to the tuft test alternative device 3.

  First, the PIV device 2 will be described. The PIV device 2 has a function of analyzing the airflow in the measurement region 6. The PIV device 2 includes a tracer supply mechanism 5, a laser irradiation mechanism 28, an imaging device 7, an image data acquisition unit 9, a PIV data generation unit 10, and an analysis unit 11. Among these, the image data acquisition unit 9, the PIV data generation unit 10, and the analysis unit 11 are realized, for example, when the CPU executes a computer program 8 stored in a ROM (Read Only Memory).

  The tracer supply mechanism 5 has a function of injecting the tracer 20 into the measurement region 6. The laser irradiation mechanism 28 has a function of irradiating the measurement region 6 with a laser. The imaging device 7 has a function of imaging the measurement region 6. The image data acquisition unit 9 has a function of acquiring image data from the imaging device 7. The PIV data generation unit 10 has a function of generating PIV data based on image data. The analysis unit 11 has a function of analyzing the statistic of the airflow in the measurement region 6 based on the PIV data.

  Subsequently, an operation method of the PIV apparatus 2 will be described.

  First, the tracer 20 is injected into the measurement region 6 by the tracer supply mechanism 5. Further, the laser irradiation mechanism 28 irradiates the measurement region 6 with laser. Then, the measurement region 6 is imaged by the imaging device 7. For example, the imaging device 7 performs imaging a plurality of times at predetermined intervals (for example, at intervals of 1/30 seconds).

  The image data acquisition unit 9 acquires image data of the measurement region 6 from the imaging device 7.

  Next, the PIV data generation unit 10 generates PIV data based on the image data. FIG. 3 is a schematic diagram showing PIV data. As shown in FIG. 3, a plurality of measurement points 18 are set in the measurement region 6. The plurality of measurement points 18 are set so as to have a lattice shape. The PIV data generation unit 10 detects the positions of the tracer particles at different times, and calculates the flow velocity vector 17 at each measurement point 18 based on the detection result. The PIV data generation unit 10 generates image data indicating the flow velocity vector 17 of each measurement point 18 as PIV data.

  PIV data is generated for each of a plurality of times. For example, the PIV data generation unit 10 generates PIV data for the time t1 based on the image data at the time t1 and the image data at the time t0 before the time t1.

  The generated PIV data is notified to the analysis unit 11. The analysis unit 11 performs analysis of air flow statistics. However, the processing in the analysis unit 11 is not related to the tuft test alternative device 3.

  Next, the tuft test alternative device 3 will be described.

  As shown in FIG. 3, the PIV data also reflects high frequency components that are not reflected in the tuft test. Therefore, simple time-series PIV data cannot be used as a substitute for tuft test. Therefore, the tuft test substitute device 3 generates tuft substitute data based on the time-series data of the PIV data so that it can be used as a substitute for the tuft test. The tuft substitute data is displayed on the display device 4.

  As shown in FIG. 2, the tuft test alternative device 3 includes a PIV data acquisition unit 13 and a tuft alternative data generation unit 14. The tuft test alternative device 3 is realized by a computer, for example. For example, the tuft test alternative device 3 is realized by the CPU executing the tuft test alternative program 12 stored in a storage medium such as a ROM.

  The PIV data acquisition unit 13 has a function of acquiring time-series PIV data from the PIV data generation unit 10. The time-series PIV data is sent to the tuft substitute data generation unit 14.

  The tuft substitute data generation unit 14 has a function of generating tuft substitute data based on time-series PIV data. Hereinafter, the configuration and operation of the tuft substitute data generation unit 14 will be described in detail.

  FIG. 4 is a block diagram showing the tuft substitute data generation unit 14. As shown in FIG. 4, the tuft substitute data generation unit 14 includes a time average calculation unit 22 and a data generation unit 23.

  FIG. 5 is a flowchart showing an operation method of the tuft test alternative device 3. With reference to FIG.4 and FIG.5, the operation | movement method of the tuft test alternative apparatus 3 is demonstrated.

Step S1: Acquisition of PIV Data First, the PIV data acquisition unit 13 acquires time-series PIV data from the PIV data generation unit 10.

Step S2: Time Average Calculation Next, the time average calculation unit 22 generates time average data based on the time-series PIV data. FIG. 6 is a conceptual diagram showing an example of time average data. The time average calculation unit 22 calculates the time average 24 of the flow velocity vector for each of the plurality of periods. The time average 24 of the flow velocity vector is calculated for each measurement point 18. The time average calculation unit 22 generates data indicating the time average 24 as a vector for each of the plurality of measurement points 18 as time average data.

Step S3: Tuft Substitution Data Generation Next, the data generation unit 23 generates tuft substitution data based on the time average data of a plurality of periods. The data generation unit 23 generates data that displays time average data of a plurality of periods in time order as tuft substitute data. That is, moving image data of time average data is generated as tuft test alternative data. The tuft substitute data is displayed on the display device 4 (for example, a display).

  As described above, according to the present embodiment, the time average of the flow velocity vectors at each measurement point 18 is calculated in the tuft test alternative device 3. By calculating the time average, the high frequency component reflected in the PIV data can be removed. As a result, by generating data that displays time average data in time order as tuft substitute data, it is possible to obtain data that shows the same movement as the tuft in the tuft test. Alternatives can be made.

  In addition, it is preferable that the time average calculation part 22 calculates the time average of the flow velocity vector by a moving average, for example. However, the time average calculation unit 22 may calculate the time average for each of a plurality of non-overlapping periods.

  Moreover, the time average calculation part 22 may calculate the time average of the flow velocity vector by the unit vector average, and may calculate the time average of the flow velocity vector by the vector average.

(Second Embodiment)
Next, the second embodiment will be described. In the present embodiment, the configuration and operation of the tuft alternative data generation unit 14 are devised with respect to the first embodiment. Since other points can be the same as those in the first embodiment, a detailed description thereof will be omitted.

  FIG. 7 is a block diagram showing the tuft substitute data generation unit 14. The tuft substitute data generating unit 14 includes a missing point identifying unit 25, a complementing unit 26, a time average calculating unit 22, and a data generating unit 23.

  FIG. 8 is a flowchart showing an operation method of the tuft test alternative device 3 according to the present embodiment.

Step S11: Acquisition of PIV Data In the present embodiment, first, time-series PIV data is acquired by the PIV data acquisition unit 13, as in the above-described embodiment.

  Here, when the PIV data is acquired, the tracer may not be spread over the entire measurement region 6. FIG. 9 is a conceptual diagram illustrating an example of PIV data. As described above, the flow velocity vector 17 is calculated based on the position of the tracer particle. Therefore, the flow velocity vector is not calculated for the measurement point 18 where no tracer particle exists. As a result, as shown in FIG. 9, there may occur a measurement point where the flow velocity vector 17 does not exist (hereinafter, missing measurement point 19).

Step S12: Identification of Missing Point Therefore, in this embodiment, the missing point identifying unit 25 is provided. The missing point identifying unit 25 identifies the missing point 19 based on the PIV data, and generates missing point data indicating the identification result.

Step S13: Complementation Missing point data is notified to the complement unit 26. The complement unit 26 supplements the flow velocity vector at the missing point 19. Specifically, the complementing unit 26 supplements the flow velocity vector by interpolation (or extrapolation) using the flow velocity vector 17 of the measurement point 18 existing around the missing measurement point 19. Thereby, as shown in FIG. 10, the flow velocity vector 21 at the missing point 19 is added, and the converted PIV data is obtained.

  For example, the complementing unit 26 can perform the complementation by calculating various amounts F of the flow velocity vector at the missing point 19 by the following formula 1.

(Formula 1); F = Σ (fi * (1 / ri) / Σ (1 / ri)
In Equation 1, fi represents various quantities at the adjacent measurement point i, and ri represents the distance between the missing measurement point 19 and the adjacent measurement point i.

Steps S14 and 15: Time average calculation and tuft substitute data generation The subsequent processing is the same as in the first embodiment. That is, the time average calculation unit 22 generates time average data based on the converted (after complement) PIV data (step S14). The data generation unit 23 generates tuft substitute data based on the time average data (step S15).

  As described above, according to the present embodiment, even when the missing point 19 occurs, the PIV data device can be used in place of the tuft test.

  In addition, the complement part 26 can complement a flow velocity vector by linear complementation, for example.

(Third embodiment)
Subsequently, a third embodiment will be described. In the present embodiment, the operation of the complementing unit 26 is changed as compared with the second embodiment. About another point, since the structure similar to 2nd Embodiment is employable, detailed description is abbreviate | omitted.

  In the second embodiment, the complement unit 26 performs the complement based on the data (flow velocity vector) at the measurement points 18 around the missing point 19. On the other hand, in this embodiment, the complement part 26 performs a complement process using the PIV data in the time before and behind.

  Specifically, the complementing unit 26 performs complementation based on PIV data at the previous and subsequent times and for which the flow velocity vector is obtained at the missing point 19.

  For example, various quantities F of the flow velocity vector at the missing point 19 can be calculated by the following equation 2.

(Formula 2); F = {(t0−t1) * f2 + (t2−t0): f1} / (t2−t1)
In the above equation 2, t0 indicates the time of the PIV data to be complemented. Moreover, t1 and t2 are the times before and after, respectively, and indicate the time when the flow velocity vector is obtained at the missing point 19. The time t1 is before the time t0, and the time t2 is after the time t0. Further, f1 and f2 respectively indicate various quantities of the flow velocity vector at the missing point 19 at time t1 and various quantities of the flow velocity vector at the missing point 19 at time t2.

  As in the present embodiment, the flow velocity vector at the missing point 19 can be complemented by using the flow velocity vectors at the previous and subsequent times as in the second embodiment.

  In addition, the complement part 26 can complement a flow velocity vector by linear complementation, for example.

  Moreover, in this embodiment, the complement part 26 complements based on the flow velocity vector in the time before and behind. That is, interpolation is performed by interpolation. However, it is not always necessary to use interpolation. For example, interpolation may be performed by extrapolation.

(Fourth embodiment)
Subsequently, a fourth embodiment will be described. In the present embodiment, the configuration of the tuft substitute data generation unit 14 is changed from the above-described embodiment. About another point, since the structure similar to embodiment mentioned above can be employ | adopted, detailed description is abbreviate | omitted.

  FIG. 11 is a block diagram illustrating a configuration of the tuft substitute data generation unit 14 in the present embodiment. The tuft substitute data generation unit 14 includes a missing point identification unit 25, a time average calculation unit 22, a data generation unit 23, and a tracer control unit 27.

  The missing point identifying unit 25 has the same functions as those of the second and third embodiments, and has a function of identifying missing points from PIV data and generating missing point data indicating the identification result. doing.

  The tracer control unit 27 has a function of controlling the operation of the tracer supply mechanism 5 (see FIG. 2) of the PIV apparatus 2. The tracer control unit 27 controls the operation of the tracer supply mechanism 5 based on the missing point data so that the tracer is supplied to the missing point.

  The time average calculation unit 22 has the same function as the above-described embodiment. That is, the time average calculation unit 22 calculates the time average of the flow velocity vector based on the PIV data, and generates time average data.

  The data generation unit 23 also has the same function as the above-described embodiment. That is, the data generation unit 23 generates tuft substitute data based on the time average data.

  Next, an operation method of the tuft test alternative device 3 according to this embodiment according to this embodiment will be described. FIG. 12 is a flowchart showing an operation method of the tuft test alternative device 3.

  First, as in the above-described embodiment, the PIV data acquisition unit 13 acquires time-series PIV data (step S21).

  Next, the missing point identifying unit 25 identifies whether or not a missing point exists (step S22). When no missing point exists, the time average calculation unit 22 generates time average data based on the PIV data (step S23), and the data generation unit 23 performs time-series time average data, as in the first embodiment. The tuft substitute data is generated based on (step S24).

  On the other hand, when there is a missing point in step S22, the tracer control unit 27 controls the tracer supply mechanism 5 to inject the tracer into the missing point (step S25). Thereafter, the operations after step S21 are repeated.

  According to this embodiment, when a missing point exists, the tracer control unit 27 reinjects the tracer into the missing point. Accordingly, the flow velocity vector at the missing point 19 can be obtained during the measurement again. Thereby, even if the missing point 19 occurs, the PIV data device can be used as an alternative to the tuft test.

  In the present embodiment, a case has been described in which when a missing point exists, a tracer is supplied to the missing point (step S25), and the operations after step S21 are repeated. At this time, in the operation after step S21 again, it is sufficient that the flow velocity vector can be obtained only for the missing point. Therefore, in the operation after step S21 again, it is not always necessary to perform processing for the entire measurement region 6. Processing only needs to be performed for the area where the missing point exists.

(Fifth embodiment)
Subsequently, a fifth embodiment will be described. In the present embodiment, the operation of the data generation unit 23 is devised with respect to the above-described embodiment. Since the other points can be the same as those of the above-described embodiment, detailed description thereof is omitted.

  FIG. 13 is a conceptual diagram illustrating an operation method of the data generation unit 23. The data generation unit 23 generates moving image data that displays time average data in time order as tuft substitute data. Here, as shown in FIG. 13, in the time average data, the length of the vector indicating the time average 24 is determined according to the flow velocity. Accordingly, the length of the vector is not constant among the plurality of measurement points 18. On the other hand, the length of the tuft used in the tuft test is constant regardless of the flow rate.

  Therefore, in the present embodiment, the data generation unit 23 converts the time average data so that the length of the vector becomes a predetermined constant length. And the data generation part 23 produces | generates the moving image data which display the time average data after conversion in time order as tuft alternative data.

  According to the present embodiment, the vector length is constant in the tuft substitute data. Therefore, it is possible to express a result more similar to the tuft test result by the tuft substitute data.

(Sixth embodiment)
Subsequently, a sixth embodiment will be described. FIG. 14 is a block diagram showing the tuft substitute data generation unit 14 according to the present embodiment. In the present embodiment, the time average calculation unit 22 (see FIG. 4) is replaced with a spatiotemporal average calculation unit 29 as compared to the above-described embodiment. Since the other configuration can adopt the same configuration as the above-described embodiment, detailed description thereof is omitted.

  The spatio-temporal average calculation unit 29 generates spatial average data based on the time-series PIV data. FIG. 15 is a schematic diagram for explaining an operation method of the spatio-temporal average calculation unit 29. As shown in FIG. 15, the spatiotemporal average calculation unit 29 sets a plurality of surrounding measurement points as adjacent measurement points for each measurement point 18. Then, the average of the flow velocity vector of the target measurement point 18 and the flow velocity vectors of a plurality of adjacent measurement points is calculated as the spatial average vector of the target measurement point 18. For example, in the example shown in FIG. 15, the measurement point (18-1, 18-2, 18-3, 18-5, 18-7, 18-9, 18-10, and 18) is measured for the measurement point 18-6. -11) is set as the adjacent measurement point. As a spatial average vector of the measurement point 18-6, a plurality of measurement points (18-1, 18-2, 18-3, 18-5, 18-6, 18-7, 18-9, 18-10, And the average of the flow velocity vectors in 18-11) is calculated. Similarly, for measurement point 18-9, a plurality of measurement points (18-4, 18-5, 18-6, 18-8, 18-9, 18-10, 18-12, 18-13, and 18 The average of the flow velocity vectors in -14) is calculated as the spatial average vector.

  Thereafter, the spatio-temporal average calculation unit 29 calculates the spatial average of the spatial average vector in each period, as in the above-described embodiment, and generates spatial average data. The data generation unit 23 generates data representing the spatial average data in time order as tuft substitute data.

  According to this embodiment, since the spatiotemporal average calculation unit 29 calculates the spatial average vector, it is possible to make the tuft substitute data closer to the moving image data obtained by the tuft test.

  In the present embodiment, the case where the time average is calculated after the spatial average vector is calculated has been described. However, after the time average is calculated, the spatial average may be calculated for each measurement point.

  The present invention has been described above using the first to sixth embodiments. Note that these embodiments are not independent and can be used in combination within a consistent range.

DESCRIPTION OF SYMBOLS 1 Tuft test alternative system 2 PIV apparatus 3 Tuft test alternative apparatus 4 Display apparatus 5 Tracer supply mechanism 6 Measurement area 7 Imaging apparatus 8 PIV program 9 Image data acquisition part 10 PIV data generation part 11 Analysis part 12 Tuft test alternative program 13 PIV data Acquisition unit 14 Tuft substitute data generation unit 15 Support line 16 Tuft 17 Flow velocity vector 18 Measurement point 19 Missing point 20 Tracer 21 Complementary vector 22 Time average calculation unit 23 Data generation unit 24 Vector 25 Missing point identification unit 26 Complementary unit 27 Tracer Control unit 28 Laser irradiation mechanism 29 Spatio-temporal average calculation unit

Claims (11)

A PIV data acquisition unit that acquires time-series data of PIV data obtained by a PIV (Particle Image Velocity) device;
A tuft substitute data generating unit that generates tuft substitute data that simulates a tuft test result based on the PIV data;
Comprising
The PIV data is data indicating a flow velocity vector at each of a plurality of measurement points set in a measurement region,
The tuft alternative data generation unit
For each of a plurality of periods, calculate the time average of the flow velocity vectors of each of the plurality of measurement points, and generate the time average data, the time average calculation unit,
A tuft test alternative device comprising: a data generation unit that generates, as the tuft alternative data, image data that displays time average data of each of the plurality of periods in time order. A tuft test alternative device according to claim 1,
The time average calculation unit is a tuft test alternative device configured to calculate a moving average as a time average of the flow velocity vector. A tuft test alternative device according to claim 1 or 2,
The data generation unit converts the time average data so that a vector has a predetermined length, and generates the tuft substitute data based on the converted time average data. It is configured.
Alternative tuft test device. A tuft test alternative device according to any one of claims 1 to 3,
The tuft substitute data generation unit further identifies, based on the PIV data, a missing point for which a flow velocity vector is not calculated at the plurality of measurement points, and generates missing point data indicating an identification result. A tuft test alternative device with a measuring point identification unit. A tuft test alternative device according to claim 4,
The tuft substitute data generation unit further includes a complementing unit that converts the PIV data based on the missing point data so that a flow velocity vector at the missing point is complemented,
The time average calculation unit is a tuft test alternative device that generates the time average data based on the converted PIV data. A tuft test alternative device according to claim 5,
The tuft test alternative device configured to supplement the flow velocity vector at the missing point based on a flow velocity vector at a time before or after the time when the flow velocity vector was not calculated. The tuft test alternative device according to claim 5 or 6,
The tuft test alternative device configured to complement the flow velocity vector of the missing point based on the flow velocity vector of the measurement point set around the missing point. The tuft test alternative device according to any one of claims 4 to 7,
The PIV device is
A tracer supply mechanism for supplying a tracer to the measurement region;
An imaging device for imaging the measurement region;
A PIV data generation unit that calculates a flow velocity vector based on the position of the tracer indicated in the captured image of the measurement region and generates PIV data based on the calculation result;
The tuft substitute data generation unit further includes a tracer control unit that controls the operation of the tracer supply mechanism so that a tracer is supplied to the missing point based on the missing point data. apparatus. Acquiring time series data of PIV data obtained by a PIV (Particle Image Velocity) device;
Generating tuft substitution data that simulates tuft test results based on the PIV data;
Comprising
The PIV data is data indicating a flow velocity vector at each of a plurality of measurement points set in a measurement region,
The step of generating the tuft substitute data includes:
For each of a plurality of periods, calculating a time average of flow velocity vectors of each of the plurality of measurement points, and generating time average data;
A tuft test alternative method comprising: generating, as the tuft substitute data, image data that displays the time average data of each of the plurality of periods in time order. Acquiring time series data of PIV data obtained by a PIV (Particle Image Velocity) device;
Generating tuft substitution data that simulates tuft test results based on the PIV data;
Comprising
The PIV data is data indicating a flow velocity vector at each of a plurality of measurement points set in a measurement region,
The step of generating the tuft substitute data includes:
For each of a plurality of periods, calculating a time average of flow velocity vectors of each of the plurality of measurement points, and generating time average data;
A tuft test substitute program for realizing, by a computer, a tuft test substitute method comprising: generating image data that displays time average data of each of the plurality of periods in time order as the tuft substitute data. A PIV data acquisition unit that acquires time-series data of PIV data obtained by a PIV (Particle Image Velocity) device;
A tuft substitute data generating unit that generates tuft substitute data that simulates a tuft test result based on the PIV data;
The PIV data is data indicating a flow velocity vector at each of a plurality of measurement points set in a measurement region,
The tuft alternative data generation unit
For each period, calculate the average of the flow velocity vectors of the plurality of measurement points and the flow velocity vectors of the plurality of adjacent measurement points, and generate the spatial average data, the spatiotemporal average calculation unit,
A tuft test alternative device comprising: a data generation unit that generates, as the tuft alternative data, image data that displays spatial average data of each of the plurality of periods in time order.

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