Fluid-solid thermal coupling simulation method and system based on temperature change monitoring

Abstract

The invention relates to a fluid-solid-heat coupling simulation method and system based on temperature change monitoring, and the method comprises the following steps: monitoring the temperature change of a sealing structure in the operation process of the sealing structure in real time, and obtaining the average cooling rate in a preset time period according to the temperature change of the sealing structure; when the average cooling rate is larger than the upper limit of the cooling rate, fluid-solid thermal coupling simulation calculation is carried out; and when the upper limit of the cooling rate is greater than or equal to the average cooling rate and is greater than or equal to the lower limit of the cooling rate, acquiring the current maximum cooling duration corresponding to the average cooling rate, comparing the cooling duration with the current maximum cooling duration, and if the conditions are met, performing fluid-solid-heat coupling simulation calculation. According to the method, all-time fluid-solid thermal coupling analysis calculation is not needed, so that the pertinence and analysis efficiency of fluid-solid thermal coupling analysis are improved, and efficient analysis and evaluation on the failure risk of the sealing structure under various transient working conditions are achieved.

Description

Technical Field

[0001] This invention relates to the field of simulation technology, and in particular to a fluid-structure-thermal coupling simulation method and system based on temperature change monitoring. Background Technology

[0002] In existing technologies, it is usually necessary to evaluate the failure boundaries of various sealing structures (such as the sealing structure of the primary loop valve of a pressurized water reactor) based on the results of fluid-structure-thermal coupling simulation calculations. However, when performing fluid-structure-thermal coupling simulation calculations using CFD simulation software and finite element analysis software, the preset boundary conditions are generally determined by calculating the thermal-hydraulic parameters of the system in which the sealing structure is located through system analysis programs (such as Relap5). Therefore, it is necessary to perform full-time coupled calculation analysis between the system analysis program and the CFD simulation software and finite element analysis software.

[0003] However, due to the complexity of the calculation principles and processes involved in current CFD simulation software and finite element analysis software, and the generally large scale of simulation calculations, if full-time coupled calculations are performed, the overall coupled calculation efficiency between the system analysis program and the CFD simulation software and finite element analysis software will be very low. This further leads to the low practicality and analytical specificity of existing fluid-structure-thermal coupled simulation analysis methods, which cannot meet the needs of efficient multidimensional operational safety analysis. Summary of the Invention

[0004] The purpose of this invention is to provide a fluid-structure-thermal coupling simulation method and system based on temperature change monitoring, which eliminates the need for full-time fluid-structure-thermal coupling analysis and calculation, thereby improving the pertinence and efficiency of fluid-structure-thermal coupling analysis, and enabling efficient analysis and assessment of the failure risk of sealed structures under various transient conditions.

[0005] To achieve the above objectives, the present invention provides the following technical solution: On the one hand, a fluid-structure-thermal coupling simulation method based on temperature change monitoring is provided, which includes the following steps: Real-time monitoring of the temperature change of the sealing structure during operation, and obtaining the average cooling rate over a predetermined time period based on the temperature change of the sealing structure. v ΔT ; When the average cooling rate v ΔT >When the cooling rate reaches its upper limit, perform fluid-structure-thermal coupling simulation calculations and conduct failure assessments of the sealing structure based on the results of the fluid-structure-thermal coupling simulation calculations; And, when the upper limit of cooling rate is greater than or equal to the average cooling rate v ΔT When the cooling rate is greater than or equal to the lower limit of the cooling rate, the average cooling rate is obtained. v ΔTThe corresponding current maximum cooling duration t max And compare the cooling duration Δt with the current maximum cooling duration. t max For comparison, if Δt≥ t max Then, fluid-structure-thermal coupling simulation calculations are performed, and the failure assessment of the sealing structure is carried out based on the results of the fluid-structure-thermal coupling simulation calculations.

[0006] Preferably, the sealing structure includes a primary loop valve sealing structure for the pressurized water reactor.

[0007] Preferably, the temperature change of the sealing structure is monitored in real time during operation, and the average cooling rate within a predetermined time period is obtained based on the temperature change of the sealing structure. v ΔT It includes the following steps: Real-time acquisition of the sealing structure at the current time t i Temperature T i And the next moment t i+1 Temperature T i+1 And if T i+1 <T i Then the current time t i Temperature T i These correspond to the cooling start time t0 and the cooling start temperature T0, respectively. Starting from the cooling start time t0, the temperature of the sealing structure is obtained at different times within a predetermined time period; If the sealing structure temperature at the next moment is lower than the sealing structure temperature at the previous moment, and within the predetermined time period, except for the cooling start time t0, the sealing structure temperature at every other moment is lower than the cooling start temperature T0, then the average cooling rate within the predetermined time period is calculated. v ΔT And the duration of cooling Δt.

[0008] Preferably, the temperature change of the sealing structure is monitored in real time during operation, and the average cooling rate within a predetermined time period is obtained based on the temperature change of the sealing structure. v ΔT It also includes the following steps: If the current time t m The temperature of the sealing structure T m Greater than or equal to the previous time t m-1 The temperature of the sealing structure T m-1 If, within the predetermined time period, the temperature of the sealing structure is lower than the initial cooling temperature T0 at every moment except for the initial cooling time t0, then the average cooling rate within the predetermined time period is calculated. vΔT And the duration of cooling Δt.

[0009] Preferably, the current cooling start time t0' = t m The current cooling start temperature T i =T m , so as to set the current time t m Current time t m The temperature T of the sealing structure itself m This serves as the starting point for reassessing whether the temperature has decreased.

[0010] Preferably, the operation of the sealing structure is monitored in real time. The temperature change of the sealing structure is measured, and the average cooling rate within a predetermined time period is obtained based on the temperature change of the sealing structure. v ΔT It also includes the following steps: If, within the predetermined time period, the temperature of the sealed structure is greater than or equal to the cooling start temperature T0 at at least one moment, then the cooling start point is redefined.

[0011] Preferably, the lower limit of the cooling rate is in the range of [0.5, 1.0], and the upper limit of the cooling rate is in the range of [500, 2000].

[0012] Preferably, the maximum cooling duration t max The acquisition process includes the following steps: By using the rate of temperature decrease of the sealing structure as a variable, the temperature of the sealing structure is set to decrease at different rates. v ΔT0 Cooling is performed, and for each cooling rate... v ΔT0 The duration of cooling is iteratively calculated to obtain different cooling rates. v ΔT0 The maximum cooling duration that causes the sealing structure to fail. t max0 ; According to different cooling rates v ΔT0 With the maximum cooling duration t max0 Calculation of the correspondence between the average cooling rate and the average cooling rate v ΔT The corresponding current maximum cooling duration t max .

[0013] Preferably, the fluid-structure-thermal coupling simulation calculation includes the following steps: Obtain the simulation template for fluid-structure-thermal coupling, and parametrically design the preset boundary conditions and output data of the simulation calculation; The fluid-structure-thermal coupling simulation calculation template is recorded using a Journal script to generate an initial Python script file, which is then edited to obtain a complete Python script file. The system receives the thermal-hydraulic parameters of the sealed structure, preprocesses the thermal-hydraulic parameters to obtain the current boundary conditions, and automatically modifies the corresponding parameters in the complete Python script file according to the current boundary conditions to complete the update of the complete Python script file. The simulation software is invoked via batch commands, and the updated Python script file is executed automatically to perform fluid-structure-thermal coupling simulation calculations and output the simulation results.

[0014] On the other hand, a fluid-structure-thermal coupling simulation system for implementing the above-mentioned fluid-structure-thermal coupling simulation method is also provided, which includes: A thermal-hydraulic parameter calculation unit is used to obtain the thermal-hydraulic parameters of the sealing structure, and the thermal-hydraulic parameters include the temperature of the sealing structure. A monitoring unit, connected to the thermal-hydraulic parameter calculation unit, is used to monitor the thermal-hydraulic parameters and determine the average cooling rate based on the thermal-hydraulic parameters. v ΔT Does the fluid-structure-thermal coupling simulation calculation trigger condition meet? The trigger condition includes: average cooling rate. v ΔT > Upper limit of cooling rate, or, upper limit of cooling rate ≥ average cooling rate v ΔT ≥ Lower limit of cooling rate, and cooling duration Δt ≥ Current maximum cooling duration t max ; The Python script generation unit is used to record the fluid-structure-thermal coupling simulation calculation template through the Journal script, generate an initial Python script file, and edit the initial Python script file to obtain a complete Python script file. The Python script updates the unit, which is used to update the average cooling rate. v ΔT When the triggering conditions for fluid-structure-thermal coupling simulation calculation are met, the thermal-hydraulic parameters are preprocessed to obtain the current boundary conditions, and the corresponding parameters in the complete Python script file are automatically modified according to the current boundary conditions to complete the update of the complete Python script file. The simulation calculation unit is used to automatically execute the updated Python script file to perform fluid-structure-thermal coupling simulation calculations and output the simulation calculation results.

[0015] In summary, the present invention has the following advantages compared with the prior art: This invention uses the average cooling rate over a predetermined time period as a trigger condition to execute different fluid-structure-thermal coupling simulation calculation strategies accordingly. It eliminates the need for full-time fluid-structure-thermal coupling analysis calculations, thereby improving the relevance and efficiency of fluid-structure-thermal coupling analysis and enabling efficient analysis and assessment of the failure risk of sealed structures under various transient conditions. Attached Figure Description

[0016] Figure 1 This is a flowchart of the steps of the fluid-structure-thermal coupling simulation method based on temperature change monitoring in this invention; Figure 2 This is a temperature curve diagram showing that the sealing structure temperature at each subsequent moment is lower than the sealing structure temperature at the previous moment in this invention. Figure 3 This is a temperature curve diagram showing the current sealing structure temperature in this invention when it is greater than or equal to the sealing structure temperature at the previous moment. Figure 4 This is a schematic diagram of the fluid-structure-thermal coupling simulation system based on temperature change monitoring in this invention. Detailed Implementation

[0017] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention. Example 1

[0018] During the operation of a sealed structure (such as the sealing structure of a primary loop valve in a pressurized water reactor), the thermal shock caused by the rapid temperature drop of the sealed structure is the main factor causing the failure of the sealed structure. Therefore, this embodiment performs fluid-structure-thermal coupling simulation based on the dynamic temperature change of the sealed structure, and further evaluates whether the sealed structure has failed based on the fluid-structure-thermal coupling simulation calculation results.

[0019] Based on this, this embodiment provides a fluid-structure-thermal coupling simulation method based on temperature change monitoring, such as... Figure 1 As shown, it includes the following steps: S1. Monitor the temperature change of the sealing structure in real time during operation, and obtain the average cooling rate within a predetermined time period based on the temperature change of the sealing structure. v ΔT Specifically, it includes the following steps: S21. Perform thermo-hydraulic parameter calculations using the Relap5 system to obtain the real-time status of the sealing structure at the current time t. i Temperature T i And the next moment t i+1 Temperature T i+1 Where, at the current time t i The next moment t i+1 These are two adjacent moments; And if T i+1 <T i If the temperature starts to drop, it indicates that monitoring needs to continue. Therefore, the current time t should be set to... i Temperature T i These correspond to the starting time t0 of cooling and the starting temperature T0 of cooling (i.e., T0 = T). i , t0=t i ), and record the starting point of cooling as (t0, T0); If T i+1 ≥T i Then the temperature information of the sealing structure is retrieved again; S22. Starting from the cooling start time t0, within a predetermined time period (e.g., 10s), at different times t0, t1, t2, ... t k-1 t k The corresponding sealing structure temperatures T0, T1, T2, ... T are obtained. k-1 T k ; If the temperature of the sealing structure at the next moment is always lower than the temperature of the sealing structure at the previous moment, that is, T always holds. k <T k-1 Furthermore, within the predetermined time period, except for the initial cooling time t0, the sealing structure temperatures T1, T2, ... T1 at each of the other times are... k-1 T k If all values ​​are less than the initial cooling temperature T0, then the average cooling rate within the predetermined time period is calculated. v ΔT and the duration of cooling Δt; for example, such as Figure 2 As shown, if time t0 to t6 is a predetermined time period, then within this predetermined time period, the temperature of the sealing structure at the next time moment is lower than the temperature of the sealing structure at the previous time moment. The temperature of the sealing structure continuously decreases from T0 to T6, which indicates that the cooling process within this predetermined time period is a continuous cooling process. If the current time t mThe temperature of the sealing structure T m Greater than or equal to the previous time t m-1 The temperature of the sealing structure T m-1 , m∈(0,k], and within the predetermined time period, except for the cooling start time t0, the temperature of the sealed structure at each other time is T1, T2, ...T k-1 T k If all values ​​are less than the initial cooling temperature T0, then the average cooling rate within the predetermined time period is calculated. v ΔT and the duration of cooling Δt; for example, such as Figure 3 As shown, if time t0 to t6 is a predetermined time period, although the sealing structure temperature T3 at time t3 is greater than the sealing structure temperature T2 at time t2, and the sealing structure temperature T5 at time t5 is greater than the sealing structure temperature T4 at time t4, the overall temperature trend from time t0 to t6, relative to the initial cooling temperature T0, is still downward. Therefore, it is also considered that the cooling process of the sealing structure temperature is continuous during the predetermined time period from time t0 to t6. Meanwhile, let the current cooling start time t0' = t m The current cooling start temperature T i =T m , so as to set the current time t m Current time t m The temperature T of the sealing structure itself m As a starting point for reassessing whether the temperature has decreased, for example Figure 3 Since T3 > T2, (t3, T3) is taken as the starting point for re-judging whether the temperature of the sealing structure has decreased. The temperature of the sealing structure at the next moment (i.e., t4) is compared with T3 to determine whether the next stage is still a cooling process. If, within the predetermined time period, the temperature of the sealed structure is greater than or equal to the cooling initiation temperature T0 at at least one moment, it indicates that the cooling process is interrupted, and there is no need to calculate the average cooling rate. v ΔT And return to step S21 to redetermine the cooling start point, for example, as Figure 3 As shown, if time t0 to t7 is a predetermined time period, when time t 7, When the temperature of the sealed structure T7 ≥ T0, it indicates that the cooling process is complete and we need to return to step S21. Furthermore, in this embodiment, according to the formula Δt=t k -t0、 v ΔT =(T0-T k Calculate the cooling duration Δt (in seconds) and the average cooling rate, respectively. v ΔT (Unit: ℃ / min); S2, based on the average cooling rate v ΔT The corresponding fluid-structure-thermal coupling simulation calculation strategy is executed, which specifically includes the following steps: When the average cooling rate v ΔT When the cooling rate is below the lower limit, it indicates that the temperature of the sealing structure drops slowly, resulting in a small thermal shock and a low probability of sealing structure failure. Therefore, there is no need to perform fluid-structure-thermal coupling simulation calculations to assess the failure of the sealing structure. When the average cooling rate v ΔT >When the cooling rate reaches the upper limit, it means that the temperature of the sealing structure drops extremely rapidly in a short period of time, resulting in a huge thermal shock and a very high probability of sealing structure failure. Therefore, it is necessary to perform fluid-structure-thermal coupling simulation calculations and evaluate the failure of the sealing structure based on the results of the fluid-structure-thermal coupling simulation calculations. When the upper limit of cooling rate is greater than or equal to the average cooling rate v ΔT When the cooling rate is greater than or equal to the lower limit of the cooling rate, the average cooling rate is obtained. v ΔT The corresponding current maximum cooling duration t max And compare the cooling duration Δt with the current maximum cooling duration. t max For comparison, if Δt≥ t max This indicates that the continuous cooling time is too long, and the probability of seal structure failure is high. Fluid-structure interaction (FSI) simulation calculations are still needed, and the seal structure failure should be assessed based on the FSI simulation results. The current maximum cooling duration... t max This refers to the average cooling rate starting from the initial cooling time t0 at the current average cooling rate. v ΔT The cooling time required for the sealing structure to fail; The lower limit of the cooling rate ranges from [0.5, 1.0], and the upper limit of the cooling rate ranges from [500, 2000], both in °C / min. For example, in this embodiment, the lower limit of the cooling rate is set to 0.5, and the upper limit of the cooling rate is set to 1500. The fluid-structure-thermal coupling simulation calculation can be completed using simulation software such as ANSYS Workbench. In addition, S3, the failure risk of the sealing structure is assessed based on fluid-structure-thermal coupling simulation calculations.

[0020] Therefore, this embodiment uses the average cooling rate over a predetermined time period as a trigger condition to execute different fluid-structure-thermal coupling simulation calculation strategies accordingly. For example, only when the average cooling rate... v ΔT > Upper limit of cooling rate, or, upper limit of cooling rate ≥ average cooling rate v ΔT ≥ Lower limit of cooling rate and maximum cooling duration t max Subsequent fluid-structure-thermal coupling simulations are only performed when the conditions are met, eliminating the need for full-time fluid-structure-thermal coupling analysis and calculations. This improves the relevance and efficiency of fluid-structure-thermal coupling analysis, enabling efficient analysis and assessment of the failure risk of sealed structures under various transient conditions. Example 2:

[0021] The only difference between this embodiment and Embodiment 1 is the maximum cooling duration. t max The acquisition process includes the following steps: By using the rate of temperature decrease of the sealing structure as a variable, the temperature of the sealing structure is set to decrease at different rates. v ΔT0 Cooling is performed, and for each cooling rate... v ΔT0 The duration of cooling is iteratively calculated to obtain different cooling rates. v ΔT0 The maximum cooling duration that causes the sealing structure to fail. t max0 ; Thus, different cooling rates were ultimately obtained. v ΔT0 With the maximum cooling duration t max0 The correspondence can be expressed as a cooling rate. v ΔT0 The independent variable is the maximum cooling duration. t max0 The curve is the dependent variable, and for each cooling rate v ΔT0 Each has a maximum cooling duration that would cause the sealing structure to fail. t max0 ; According to different cooling rates v ΔT0 With the maximum cooling duration t max0 Calculation of the correspondence between the average cooling rate and the average cooling rate v ΔT The corresponding current maximum cooling duration t maxFor example, in this embodiment, different cooling rates v ΔT0 With the maximum cooling duration t max0 The correspondence can be obtained by fitting a Reciprocal nonlinear function model, etc., to determine the average cooling rate. v ΔT Substituting into this relationship, the corresponding current maximum cooling duration can be calculated. t max . Example 3:

[0022] The only difference between this embodiment and Embodiment 1 or 2 is that the fluid-structure-thermal coupling simulation calculation includes the following steps: Obtain a fluid-structure-thermal coupling simulation calculation template, and parametrically design the preset boundary conditions and result output data of the simulation calculation. The fluid-structure-thermal coupling simulation calculation template includes one or more of the following: a finite element calculation model of the sealed structure, solution settings of the calculation module, calculation process, and result output format. The boundary conditions include one or more of the following: temperature boundary conditions, wall temperature boundary conditions, and pressure boundary conditions. The fluid-structure-thermal coupling simulation calculation template is recorded using a Journal script to generate an initial Python script file. The initial Python script file is then edited (such as modified and added) by writing a specific script to obtain a complete Python script file. The system receives the thermal-hydraulic parameters of the sealed structure, preprocesses the thermal-hydraulic parameters to obtain the current boundary conditions, and automatically modifies the corresponding parameters (e.g., preset boundary conditions) in the complete Python script file according to the current boundary conditions to complete the update of the complete Python script file. In this embodiment, the thermal-hydraulic parameters include one or more of temperature, pressure, etc., which can be calculated and obtained by the Relap5 system. The simulation software (such as ANSYS Workbench) is invoked through batch commands, and the updated Python script file is executed automatically to perform fluid-structure-thermal coupling simulation calculations and output the simulation results. Example 4:

[0023] This embodiment provides a fluid-structure-thermal coupling simulation system, which can implement the fluid-structure-thermal coupling simulation method described in any one of embodiments 1-3, such as... Figure 4 As shown, the fluid-structure-thermal coupling simulation system includes: The thermal-hydraulic parameter calculation unit 1 is used to obtain the thermal-hydraulic parameters of the sealing structure. In this embodiment, the thermal-hydraulic parameter calculation unit 1 includes the Relap5 system, and the thermal-hydraulic parameters include one or more of the following: sealing structure temperature, pressure, etc. The monitoring unit 2, connected to the thermal-hydraulic parameter calculation unit 1, is used to monitor the thermal-hydraulic parameters and determine the average cooling rate based on the thermal-hydraulic parameters. v ΔT Does the fluid-structure-thermal coupling simulation calculation trigger condition meet? The trigger condition includes: average cooling rate. v ΔT > Upper limit of cooling rate, or, upper limit of cooling rate ≥ average cooling rate v ΔT ≥ Lower limit of cooling rate, and cooling duration Δt ≥ Current maximum cooling duration t max Among them, the average cooling rate v ΔT Current maximum cooling duration t max The method of obtaining it is the same as in Example 1 or Example 2; Python script generation unit 3 is used to record the fluid-structure-thermal coupling simulation calculation template through Journal script, generate an initial Python script file, and edit the initial Python script file by writing a specific script to obtain a complete Python script file; Python script updates unit 4, which is used to update the average cooling rate. v ΔT When the triggering conditions for fluid-structure-thermal coupling simulation calculation are met, the thermal-hydraulic parameters are preprocessed to obtain the current boundary conditions, and the corresponding parameters in the complete Python script file are automatically modified according to the current boundary conditions to complete the update of the complete Python script file. The simulation calculation unit 5 is used to automatically execute the updated Python script file to perform fluid-structure-thermal coupling simulation calculations and output the simulation calculation results. In this embodiment, the simulation calculation unit 5 includes systems such as ANSYS Workbench.

[0024] In summary, this invention uses the average cooling rate over a predetermined time period as a trigger condition to execute different fluid-structure-thermal coupling simulation calculation strategies accordingly. For example, only when the average cooling rate... v ΔT > Upper limit of cooling rate, or, upper limit of cooling rate ≥ average cooling rate vΔT ≥ Lower limit of cooling rate and maximum cooling duration t max Subsequent fluid-structure-thermal coupling simulations are only performed when the conditions are met, thus eliminating the need for full-time fluid-structure-thermal coupling analysis calculations, thereby improving the relevance and efficiency of fluid-structure-thermal coupling analysis.

[0025] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A fluid-structure-thermal coupling simulation method based on temperature change monitoring, characterized in that, Includes the following steps: Real-time monitoring of the temperature change of the sealing structure during operation, and obtaining predictions based on the temperature change of the sealing structure. Average cooling rate over a given time period v ΔT ; When the average cooling rate v ΔT >When the cooling rate reaches its upper limit, perform fluid-structure-thermal coupling simulation calculations and conduct failure assessments of the sealing structure based on the results of the fluid-structure-thermal coupling simulation calculations; And, when the upper limit of cooling rate is greater than or equal to the average cooling rate v ΔT When the cooling rate is greater than or equal to the lower limit of the cooling rate, the average cooling rate is obtained. v ΔT The corresponding current maximum cooling duration t max And compare the cooling duration Δt with the current maximum cooling duration. t max For comparison, if Δt≥ t max Then, fluid-structure-thermal coupling simulation calculations are performed, and the failure assessment of the sealing structure is carried out based on the results of the fluid-structure-thermal coupling simulation calculations.

2. The fluid-structure-thermal coupling simulation method as described in claim 1, characterized in that, The sealing structure includes the primary loop valve sealing structure of the pressurized water reactor.

3. The fluid-structure-thermal coupling simulation method as described in claim 1, characterized in that, The system monitors the temperature change of the sealing structure in real time during operation and obtains the average cooling rate over a predetermined time period based on the temperature change. v ΔT It includes the following steps: Real-time acquisition of the sealing structure at the current time t i Temperature T i And the next moment t i+1 Temperature T i+1 And if T i+1 <T i Then the current time t i Temperature T i These correspond to the cooling start time t0 and the cooling start temperature T0, respectively. Starting from the cooling start time t0, the temperature of the sealing structure is obtained at different times within a predetermined time period; If the sealing structure temperature at the next moment is lower than the sealing structure temperature at the previous moment, and within the predetermined time period, except for the cooling start time t0, the sealing structure temperature at every other moment is lower than the cooling start temperature T0, then the average cooling rate within the predetermined time period is calculated. v ΔT And the duration of cooling Δt.

4. The fluid-structure-thermal coupling simulation method as described in claim 3, characterized in that, The system monitors the temperature change of the sealing structure in real time during operation and obtains the average cooling rate over a predetermined time period based on the temperature change. v ΔT It also includes the following steps: If the current time t m The temperature of the sealing structure T m Greater than or equal to the previous time t m-1 The temperature of the sealing structure T m-1 If, within the predetermined time period, the temperature of the sealing structure is lower than the initial cooling temperature T0 at every moment except for the initial cooling time t0, then the average cooling rate within the predetermined time period is calculated. v ΔT And the duration of cooling Δt.

5. The fluid-structure-thermal coupling simulation method as described in claim 4, characterized in that, Let the current cooling start time be t0' = t m The current cooling start temperature T i =T m , so as to set the current time t m Current time t m The temperature T of the sealing structure itself m This serves as the starting point for reassessing whether the temperature has decreased.

6. The fluid-structure-thermal coupling simulation method as described in claim 3, characterized in that, Real-time monitoring of the sealing structure operation process The temperature change of the sealing structure is measured, and the average cooling rate within a predetermined time period is obtained based on the temperature change of the sealing structure. v ΔT It also includes the following steps: If, within the predetermined time period, the temperature of the sealed structure is greater than or equal to the cooling start temperature T0 at at least one moment, then the cooling start point is redefined.

7. The fluid-structure-thermal coupling simulation method as described in claim 1, characterized in that, The lower limit of the cooling rate is in the range of [0.5, 1.0], and the upper limit of the cooling rate is in the range of [500, 2000].

8. The fluid-structure-thermal coupling simulation method as described in claim 1, characterized in that, The maximum cooling duration t max The acquisition process includes the following steps: By using the rate of temperature decrease of the sealing structure as a variable, the temperature of the sealing structure is set to decrease at different rates. v ΔT0 Cooling is performed, and for each cooling rate... v ΔT0 The duration of cooling is iteratively calculated to obtain different cooling rates. v ΔT0 The maximum cooling duration that causes the sealing structure to fail. t max0 ; According to different cooling rates v ΔT0 With the maximum cooling duration t max0 Calculation of the correspondence between the average cooling rate and the average cooling rate v ΔT The corresponding current maximum cooling duration t max .

9. The fluid-structure-thermal coupling simulation method as described in claim 1, characterized in that, The fluid-structure-thermal coupling simulation calculation includes the following steps: Obtain the simulation template for fluid-structure-thermal coupling, and parametrically design the preset boundary conditions and output data of the simulation calculation; The fluid-structure-thermal coupling simulation calculation template is recorded using a Journal script to generate an initial Python script file, which is then edited to obtain a complete Python script file. The system receives the thermal-hydraulic parameters of the sealed structure, preprocesses the thermal-hydraulic parameters to obtain the current boundary conditions, and automatically modifies the corresponding parameters in the complete Python script file according to the current boundary conditions to complete the update of the complete Python script file. The simulation software is invoked via batch commands, and the updated Python script file is executed automatically to perform fluid-structure-thermal coupling simulation calculations and output the simulation results.

10. A fluid-structure-thermal coupling simulation system for implementing the fluid-structure-thermal coupling simulation method according to any one of claims 1-9, characterized in that, include: A thermal-hydraulic parameter calculation unit is used to obtain the thermal-hydraulic parameters of the sealing structure, and the thermal-hydraulic parameters include the temperature of the sealing structure. A monitoring unit, connected to the thermal-hydraulic parameter calculation unit, is used to monitor the thermal-hydraulic parameters and determine the average cooling rate based on the thermal-hydraulic parameters. v ΔT Does the fluid-structure-thermal coupling simulation calculation trigger condition meet? The trigger condition includes: average cooling rate. v ΔT > Upper limit of cooling rate, or, upper limit of cooling rate ≥ average cooling rate v ΔT ≥ Lower limit of cooling rate, and cooling duration Δt ≥ Current maximum cooling duration t max ; The Python script generation unit is used to record the fluid-structure-thermal coupling simulation calculation template through the Journal script, generate an initial Python script file, and edit the initial Python script file to obtain a complete Python script file. The Python script updates the unit, which is used to update the average cooling rate. v ΔT When the triggering conditions for fluid-structure-thermal coupling simulation calculation are met, the thermal-hydraulic parameters are preprocessed to obtain the current boundary conditions, and the corresponding parameters in the complete Python script file are automatically modified according to the current boundary conditions to complete the update of the complete Python script file. The simulation calculation unit is used to automatically execute the updated Python script file to perform fluid-structure-thermal coupling simulation calculations and output the simulation calculation results.

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