CN112131639B - Numerical simulation method for high-speed train over-high ground temperature tunnel - Google Patents
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Abstract
The invention discloses a numerical simulation method for a high-speed train over-high ground temperature tunnel, which comprises the following steps: carrying out three-dimensional modeling on the tunnel and the train to obtain a three-dimensional model; importing the three-dimensional model into grid discrete software, and carrying out grid discrete division on the three-dimensional model by utilizing the grid discrete software to obtain a discrete model; importing a discrete model derived from grid discrete software into CFD simulation software to obtain a mathematical computation model; setting boundary conditions of the mathematical computation model in CFD simulation software; when boundary conditions are set, the initial temperature of the ground temperature in the tunnel model along the length direction is set by using a UDF program; and calculating and obtaining a pressure change curve at a specified position on the inner wall of the tunnel model and/or the outer surface of the train model based on the mathematical calculation model. According to the invention, through the research on the temperature field and the pressure transient of the high-ground-temperature tunnel, the influence of the high ground temperature on the pressure transient of the railway tunnel can be obtained, and a scientific basis is provided for the aerodynamic research in the high-ground-temperature environment.
Description
Technical Field
The invention belongs to the technical field of numerical simulation methods, and particularly relates to a numerical simulation method for a high-speed train over-high ground temperature tunnel.
Background
When a train passes through a high-temperature-difference railway tunnel, a strong nonlinear system consisting of a train-tunnel-running environment generates a complex aerodynamic dynamic response: the sound velocity changes due to high temperature difference and gas pressure, the pressure fluctuation in the tunnel is extremely easy to change, and when the pressure fluctuation is transmitted into the vehicle, passengers are easy to feel uncomfortable, and the comfort of the passengers is seriously affected.
Most road sections of the planned and constructed Sichuan-Tibet railway are located in Qinghai-Tibet plateau, a plurality of tunnels are arranged on the whole line, 10 high-temperature heat tunnels are arranged, the highest temperature of rocks can reach 86.0 ℃ (mulberry ridge tunnels), the temperature of air in the tunnels can reach 56 ℃, and the air outside the tunnels can reach over thirty degrees below zero under extreme conditions, so that a great temperature difference can be formed inside and outside the tunnels.
The current railway tunnel aerodynamic problem research mainly focuses on the aspects of the flow field evolution of train passing through the tunnel at normal temperature, the influence rule of the train and the tunnel parameters and the like. For extreme environments along Sichuan-Tibet railways and environmental characteristics such as low air pressure, high temperature difference, long tunnels formed by long and large tunnels of railways, no research on convection, heat and solid coupling exists so far.
Due to limitations of experimental research, high cost and the like, the current relevant research mainly focuses on numerical simulation, and reliable and accurate calculation results can be obtained through numerical simulation, so that the method for researching the heat-current coupling problem of the train passing through the tunnel in the high-ground-temperature environment through the numerical simulation is also an economical and practical method.
In conclusion, no report is found in the numerical simulation research directly aiming at the problems of the evolution mechanism of the transient pressure of the railway tunnel with high temperature difference and the influence on parameter sensitivity, and the corresponding numerical simulation research work of the tunnel with high temperature difference is urgently needed to be carried out.
Disclosure of Invention
The invention aims to fill the blank of the numerical simulation method research on the high-speed train over-high ground temperature tunnel at present, and provides a numerical simulation method for the high-speed train over-high ground temperature tunnel.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows:
a numerical simulation method for a tunnel with a high ground temperature of a high-speed train is characterized by comprising the following steps:
step A, performing three-dimensional modeling on a tunnel and a train to obtain a three-dimensional model;
b, importing the three-dimensional model into grid discrete software, and carrying out grid discrete division on the three-dimensional model by utilizing the grid discrete software to obtain a discrete model;
step C, importing a discrete model derived from grid discrete software into CFD simulation software to obtain a mathematical computation model;
step D, setting boundary conditions of the mathematical computation model in CFD simulation software; setting the initial temperature of the ground temperature in the tunnel model along the length direction by using a UDF program when setting the boundary condition;
and calculating and obtaining a pressure change curve at a specified position on the inner wall of the tunnel model and/or the outer surface of the train model based on the mathematical calculation model.
Preferably, the initial temperature of the earth temperature in the tunnel model is changed or unchanged along the length direction.
Preferably, the initial temperature of the earth temperature in the tunnel model changes continuously or discontinuously along the length direction.
Preferably, the initial temperature of the earth temperature in the tunnel model changes in a parabolic shape along the longitudinal direction.
Due to the particularity of the temperature field, in order to achieve convergence of the calculation and reliability of the result, as a preferred mode, the step D comprises:
d1, the train model slides outside the tunnel model at a speed V1 lower than the test speed V0 without heating the inside of the tunnel model, whether the inside and outside flow fields of the tunnel model reach a stable state or not is judged based on the calculation of the mathematical calculation model, and the step D2 is skipped when the inside and outside flow fields of the tunnel model reach the stable state;
d2, because the low-speed air flow in the tunnel model can affect the temperature field, the speed of the train model is set to 0 at the moment, the tunnel model is not heated, whether the air flow speed in the tunnel model is less than 0.05m/s (namely the air in the tunnel model flows slightly) is judged based on the calculation of the mathematical calculation model, and the step D3 is skipped when the air flow speed in the tunnel model is less than 0.05 m/s; when the air flow rate is less than 0.05m/s, the air flow does not influence the distribution of the temperature field, and the tunnel heating can be carried out at the moment;
d3, setting the speed of the train model to be 0, starting and heating the tunnel model at the set ground temperature initial temperature, judging whether the temperature of the specified point of the tunnel model reaches the preset target temperature required by the experiment according to the temperature monitoring data, and jumping to the step D4 when the temperature of the specified point of the tunnel model reaches the preset target temperature;
and D4, continuing heating the tunnel model, simultaneously enabling the train model to pass through the tunnel model at the test speed V0, and calculating to obtain a pressure change curve at a designated position on the inner wall of the tunnel model and/or the outer surface of the train model based on the mathematical calculation model.
Further, still include:
and E, repeating the steps A to D corresponding to different ground temperature initial temperatures, monitoring the temperature change of a specified point in the tunnel model under different ground temperature initial temperature conditions, and obtaining the pressure propagation rule of the specified position on the inner wall of the tunnel model and/or the outer surface of the train model under different ground temperature initial temperature conditions and the influence weight of the different ground temperature initial temperatures on the pressure peak value fluctuation.
Preferably, in step D1, when the difference between the amount of air flowing into the tunnel model and the amount of air flowing out of the tunnel model is within a predetermined range, it is determined that the internal and external flow fields of the tunnel model are in a steady state.
In the setting of the boundary condition of the calculation process, since the energy option needs to be started due to the existence of the temperature field, in order to realize the convergence of the calculation, the mathematical calculation model adopts a differential format QUICK format with first-order precision as a preferable mode.
Compared with the prior art, the method can obtain the influence of the high ground temperature on the pressure transient of the railway tunnel through the research on the temperature field and the pressure transient of the high ground temperature tunnel, and provides scientific basis for the aerodynamic research in the high ground temperature environment.
Detailed Description
The present invention will be further described with reference to the following examples.
The method is mainly realized through CFD simulation software and an UDF program, and the UDF program mainly performs input and control of ground temperatures in different forms, so that numerical simulation in different ground temperature forms is realized, and finally, the pressure transient law in the train and the tunnel in a high-temperature environment is obtained. The tunnel model can be divided into a heating area and a non-heating area, and can also be completely heated.
Specifically, the numerical simulation method for the high-speed train passing through the high ground temperature tunnel comprises the following steps:
step A, performing three-dimensional modeling on a tunnel and a train to obtain a three-dimensional model;
b, importing the three-dimensional model into grid discrete software, and carrying out grid discrete division on the three-dimensional model by utilizing the grid discrete software to obtain a discrete model;
step C, importing a discrete model derived from grid discrete software into CFD simulation software to obtain a mathematical computation model;
step D, setting boundary conditions of the mathematical computation model in CFD simulation software; setting the initial temperature of the ground temperature in the tunnel model along the length direction by using a UDF program when setting the boundary condition; and calculating and obtaining a pressure change curve at a specified position on the inner wall of the tunnel model and/or the outer surface of the train model based on the mathematical calculation model.
The boundary condition setting requires the ground temperature input to be controlled by the UDF program and the heating items to be started according to the steps. When boundary conditions are set, the initial temperature of the ground temperature with various complex changes can be input through the UDF program, and the method is closer to the ground temperature form with various complex changes in reality and is closer to reality. Preferably, the initial temperature of the ground temperature in the tunnel model is changed or unchanged along the length direction. When the initial temperature changes, the initial temperature of the ground temperature in the tunnel model changes continuously or discontinuously along the length direction, and the change rule is in other forms such as a parabola and the like.
In the setting of the boundary condition of the calculation process, since the existence of the temperature field needs to start energy option, in order to realize the convergence of the calculation, the mathematical calculation model adopts a QUICK format with first-order precision in a differential format.
Due to the particularity of the temperature field, in order to achieve convergence of the calculation and reliability of the result, the step D comprises:
d1, the train model slides outside the tunnel model at a speed V1 which is far lower than the test speed V0, the tunnel model is not heated, whether the inner flow field and the outer flow field of the tunnel model reach a stable state or not is judged based on the calculation of a mathematical calculation model, and the step D2 is skipped when the inner flow field and the outer flow field of the tunnel model reach the stable state; speed V1 is very low, set as needed;
d2, because the low-speed air flow in the tunnel model can affect the temperature field, the speed of the train model is set to 0 at the moment, the interior of the tunnel model is not heated, whether the air flow speed in the tunnel model is less than 0.05m/s (namely the air in the tunnel model flows slightly) is judged based on the calculation of the mathematical calculation model, and the step D3 is skipped when the air flow speed in the tunnel model is less than 0.05 m/s; when the air flow rate is less than 0.05m/s, the air flow does not influence the distribution of the temperature field, and the tunnel heating can be carried out at the moment;
d3, setting the speed of the train model to be 0, starting and heating the tunnel model at the set ground temperature initial temperature, judging whether the temperature of the specified point of the tunnel model reaches the preset target temperature required by the experiment according to the temperature monitoring data, and jumping to the step D4 when the temperature of the specified point of the tunnel model reaches the preset target temperature;
and D4, continuing heating the tunnel model, simultaneously enabling the train model to pass through the tunnel model at the test speed V0, and calculating to obtain a pressure change curve at a designated position on the inner wall of the tunnel model and/or the outer surface of the train model based on the mathematical calculation model.
In order to analyze the influence of temperature on the pressure wave propagation and the pressure wave peak, the invention also comprises:
and E, repeating the step A to the step D corresponding to different ground temperature initial temperatures, monitoring the temperature change of a specified point in the tunnel model under different ground temperature initial temperature conditions through a UDF program, and then obtaining the pressure propagation rule of a specified position on the inner wall of the tunnel model and/or the outer surface of the train model under different ground temperature initial temperature conditions and the influence weight of the different ground temperature initial temperatures on the pressure peak value fluctuation according to specific temperature values.
Preferably, in step D1, when the difference between the air amount flowing into the tunnel model and the air amount flowing out of the tunnel model is within a predetermined range, it is determined that the internal and external flow fields of the tunnel model are in a steady state.
In the specific embodiment, the high-speed train motor train unit selects a double-layer high-speed motor train unit, the tunnel model adopts all heating modes, boundary conditions are set by utilizing a UDF program, the ground temperature mode of the tunnel model is set to be an initial ground temperature mode of parabolic growth input along the length direction of the tunnel model, and a heating mode and heating power of the initial ground temperature are set. By utilizing the method, the train pressure transient rule under the high ground temperature field can be obtained, and the feasibility of the method is verified.
While embodiments of the present invention have been described, the present invention is not limited to the above-described embodiments, which are intended to be illustrative rather than limiting, and many modifications may be made by those skilled in the art without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (6)
1. A numerical simulation method for a tunnel with a high ground temperature crossed by a high-speed train is characterized by comprising the following steps:
step A, performing three-dimensional modeling on a tunnel and a train to obtain a three-dimensional model;
b, importing the three-dimensional model into grid discrete software, and carrying out grid discrete division on the three-dimensional model by utilizing the grid discrete software to obtain a discrete model;
step C, importing a discrete model derived from grid discrete software into CFD simulation software to obtain a mathematical computation model;
step D, setting boundary conditions of the mathematical computation model in CFD simulation software; setting the initial temperature of the ground temperature in the tunnel model along the length direction by using a UDF program when setting the boundary condition;
calculating and obtaining a pressure change curve at a specified position on the inner wall of the tunnel model and/or the outer surface of the train model based on the mathematical calculation model;
the step D comprises the following steps:
d1, sliding the train model outside the tunnel model at a speed V1 lower than the test speed V0 without heating the inside of the tunnel model, calculating and judging whether the inside and outside flow fields of the tunnel model reach a stable state based on a mathematical calculation model, and jumping to the step D2 when the inside and outside flow fields of the tunnel model reach the stable state;
d2, setting the speed of the train model to be 0, not heating the tunnel model, calculating and judging whether the air flow rate in the tunnel model is less than 0.05m/s or not based on the mathematical calculation model, and jumping to the D3 when the air flow rate in the tunnel model is less than 0.05 m/s;
d3, setting the speed of the train model to be 0, starting and heating the tunnel model at the set ground temperature initial temperature, judging whether the temperature of the specified point of the tunnel model reaches the preset target temperature required by the experiment according to the temperature monitoring data, and jumping to the step D4 when the temperature of the specified point of the tunnel model reaches the preset target temperature;
d4, continuing to heat the tunnel model, enabling the train model to pass through the tunnel model at a test speed V0, and calculating to obtain a pressure change curve at a designated position on the inner wall of the tunnel model and/or the outer surface of the train model based on the mathematical calculation model;
and E, repeating the steps A to D corresponding to different ground temperature initial temperatures, monitoring the temperature change of a specified point in the tunnel model under different ground temperature initial temperature conditions, and obtaining the pressure propagation rule of the specified position on the inner wall of the tunnel model and/or the outer surface of the train model under different ground temperature initial temperature conditions and the influence weight of the different ground temperature initial temperatures on the pressure peak value fluctuation.
2. The numerical simulation method for the high-speed train passing through the high-ground-temperature tunnel according to claim 1, wherein the initial temperature of the ground temperature in the tunnel model is changed or unchanged along the length direction.
3. The numerical simulation method for a high-speed train passing through a high-ground-temperature tunnel according to claim 2, wherein the initial temperature of the ground temperature in the tunnel model changes continuously or discontinuously along the length direction.
4. The numerical simulation method for a high-speed train passing through a high-ground-temperature tunnel according to claim 3, wherein the initial temperature of the ground temperature in the tunnel model changes in a parabolic shape along the length direction.
5. The numerical simulation method for a tunnel with a high ground temperature through a high-speed train according to claim 1, wherein in step D1, when a difference between an amount of air flowing into the tunnel model and an amount of air flowing out of the tunnel model is within a set range, it is determined that an internal and external flow field of the tunnel model reaches a steady state.
6. The numerical simulation method for a high-speed train passing through a high-ground-temperature tunnel according to claim 1, wherein the mathematical calculation model adopts a QUICK format with first-order precision in a differential format.
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| CN105569709A (en) * | 2016-01-25 | 2016-05-11 | 西南交通大学 | Control method for cooling and ventilation of high-ground-temperature railway tunnel |
| CN107237646A (en) * | 2017-06-28 | 2017-10-10 | 山东科技大学 | The quantitative method for protecting support in large deformation constant resistance supporting grouted anchor bar, anchor cable and tunnel |
| CN108278130A (en) * | 2017-12-07 | 2018-07-13 | 淮阴工学院 | A kind of tunnel in cold area temperature field monitoring device and its test method |
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