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CN-121995756-A - Intelligent grid control system and method for hypersonic flow field calculation

CN121995756ACN 121995756 ACN121995756 ACN 121995756ACN-121995756-A

Abstract

The invention discloses an intelligent grid control system and method for hypersonic flow field calculation, which relate to the technical field of hypersonic flow field calculation and flow field numerical simulation intersection, and adopt an integrated deep coupling framework of resonance sensing-coupling regulation-cooperative adaptation-closed loop verification, wherein the integrated deep coupling framework comprises a parallel deviation chaotic characteristic sensing and resonance threshold calibration module, a flow field deviation resonance coupling regulation module and a resonance coupling cooperative regulation core module; according to the invention, the chaotic characteristic of the super-calculation parallel synchronous deviation is captured, a controllable resonance coupling mechanism with flow field fluctuation is established, integrated cooperative regulation and control are realized through bidirectional gain adjustment, accurate coupling coefficient calculation and closed loop verification, the problems of efficiency loss caused by parallel deviation inhibition, linear feedback adjustment hysteresis, fixed threshold redundancy and insufficient flow field calculation precision and stability in the prior art are solved, the synchronous improvement of hypersonic flow field calculation efficiency, precision and stability is realized, and the effects of adapting to different working conditions and needing no hardware transformation are realized.

Inventors

  • ZHOU DONGLONG

Assignees

  • 太原工业学院

Dates

Publication Date
20260508
Application Date
20260128

Claims (9)

  1. 1. The intelligent grid control system for hypersonic flow field calculation is characterized by adopting an integrated deep coupling framework of resonance sensing-coupling regulation and control-cooperative adaptation-closed loop verification, and the intelligent grid control system comprises a parallel deviation chaos characteristic sensing and resonance threshold calibration module, a flow field deviation resonance coupling regulation and control module, a resonance coupling cooperative regulation core module, an intelligent grid dynamic resonance adaptation module and a closed loop resonance stability verification and optimization module, wherein the modules are sequentially connected in a signal manner to form a cooperative regulation and control link, and a controllable resonance coupling mechanism of the cooperative regulation and control link with flow field fluctuation is established by capturing the chaos characteristic of hypersonic parallel synchronization deviation, so that the resonance coupling characteristic is converted into an integrated cooperative regulation and control instruction of grid parameters and CFL threshold values, and the integrated deep coupling mechanism is used for hypersonic flow field efficient, accurate and stable calculation.
  2. 2. The intelligent grid control system for hypersonic flow field calculation, as set forth in claim 1, is characterized in that the parallel deviation chaotic characteristic sensing and resonance threshold calibration module comprises a deviation chaotic parameter acquisition sub-module, a chaotic characteristic extraction sub-module and a deviation flow field resonance threshold calibration sub-module, wherein the deviation chaotic parameter acquisition sub-module synchronously acquires and super calculates deviation amplitude, fluctuation frequency and phase difference of each core under each time step by adopting a time step-core node two-dimensional acquisition strategy, the sampling frequency and flow field calculation time step 1:1 are mapped, the chaotic characteristic extraction sub-module extracts three core parameters of the chaotic intensity, the fluctuation dominant frequency and the phase stability of deviation based on an improved Lyapunov index algorithm, and the deviation flow field resonance threshold calibration sub-module establishes an effective resonance interval library of the deviation chaotic parameter and the flow field fluctuation parameter by pre-calculating a typical hypersonic flow field case.
  3. 3. The intelligent grid control system for hypersonic flow field calculation according to claim 1 is characterized in that the flow field deviation resonance coupling regulation and control module comprises a flow field fluctuation characteristic sensing submodule and a bidirectional resonance gain regulation submodule, wherein the flow field fluctuation characteristic sensing submodule synchronously collects flow field shock wave intensity, vortex breaking frequency and pressure gradient change rate, extracts flow field fluctuation main frequency and amplitude change rate, and the bidirectional resonance gain regulation submodule adopts bidirectional gain regulation design of deviation to flow field and flow field deviation to realize gain coefficient self-adaptive correction through the following formula: ; Wherein the method comprises the steps of In order to correct the bi-directional resonance gain coefficient, In order to correct the pre-correction bi-directional resonance gain coefficient, In order to provide a gain adjustment factor, As the chaotic strength of the current deviation, The upper limit value of the chaotic intensity corresponding to the effective resonance interval.
  4. 4. The hypersonic flow field computing intelligent grid control system of claim 1, wherein the resonance coupling cooperative adjustment core module comprises a resonance coupling coefficient adaptation submodule and a cooperative instruction generation submodule, wherein the resonance coupling coefficient adaptation submodule calculates a resonance coupling coefficient according to the following formula: ; Wherein the method comprises the steps of As a result of the resonance coupling coefficient, , , The weight coefficients of the chaotic intensity, the flow field fluctuation amplitude change rate and the resonance gain are respectively satisfied, As the chaotic intensity of the deviation, the difference between the two values, For the flow field fluctuation amplitude change rate, For the bi-directional resonant gain coefficient, Is the phase difference of the deviation fluctuation and the flow field fluctuation.
  5. 5. The intelligent grid control system for hypersonic flow field computation of claim 1, wherein the intelligent grid dynamic resonance adaptation module comprises a grid resonance response sub-module and a local time step coupling sub-module, wherein the local time step coupling sub-module computes the local time step of the grid encryption area by the following formula: ; Wherein the method comprises the steps of For a local time step of the grid encryption area, As a base time-step size of the time, As a result of the resonance coupling coefficient, To account for the phase difference of the offset fluctuation and the flow field fluctuation, Is a time step safety factor.
  6. 6. The hypersonic flow field computing intelligent grid control system of claim 1, wherein the closed loop resonance stability verification and optimization module comprises a resonance stability verification sub-module and a coupling parameter feedback correction sub-module, the resonance stability verification sub-module uses residual error change rate not more than 10 -3 and flow field shock wave position error not more than 3% as resonance stability criteria, if the residual error change rate is greater than 10 -3 , the resonance gain coefficient is reduced, if the error is greater than 3%, the effective resonance interval threshold is corrected, the coupling parameter feedback correction sub-module reversely feeds the verification result back to the resonance threshold calibration sub-module and the coupling coefficient adaptation sub-module, and the effective resonance interval threshold and the coupling coefficient computing weight are corrected.
  7. 7. An intelligent grid control method for hypersonic flow field calculation is characterized by taking controllable resonance coupling as a core main line and comprising the following steps: Initializing resonance parameters and a computing environment, loading a typical flow field resonance threshold library, and setting offset acquisition frequency to be synchronous with flow field computing time step 1:1; step (2) starting flow field parallel calculation, and synchronously collecting parallel deviation chaotic parameters and flow field fluctuation parameters; step (3), controllable resonance coupling of deviation and flow field fluctuation is realized through bidirectional gain adjustment, and a resonance coupling coefficient is calculated; Generating and executing an integrated cooperative instruction of grid parameters, CFL thresholds and core resource allocation according to the resonance coupling coefficients; Step (5), performing closed-loop resonance stability verification through residual error change rate and flow field parameter error, and correcting resonance parameters; And (6) iterating the steps (2) to (5) until the flow field calculation termination condition is met, and outputting a calculation result and grid parameters.
  8. 8. The intelligent grid control method for hypersonic flow field calculation as set forth in claim 7, wherein the parameters initialized in the step (1) include effective resonance interval parameters of deviation Lyapunov index 0.45-0.65, fluctuation main frequency difference value less than or equal to 0.2Hz, and resonance coupling coefficient calculation weight coefficient =0.3、 =0.4、 =0.3, The bi-directional resonance gain initial value=0.7, the time step safety factor=0.95, and the resonance stability check period is 1 time every 5 time steps.
  9. 9. The intelligent grid control method for hypersonic flow field calculation according to claim 7 is characterized in that in the step (3), if the difference between the deviation and the main frequency of flow field fluctuation is more than 0.2Hz, the main frequency of the deviation fluctuation is close to the main frequency of flow field fluctuation through software adjustment of the super-calculation core data interaction delay, if the adjustment is invalid, the grid of a non-critical area of the flow field is thinned by a thinning coefficient of 1.1, and when the chaos intensity of the deviation is more than or equal to 0.7, the gain coefficient is corrected through a bidirectional resonance gain adjustment formula.

Description

Intelligent grid control system and method for hypersonic flow field calculation Technical Field The invention relates to the technical field of super-computing parallel computation and flow field numerical simulation intersection, in particular to an intelligent grid control system and method for hypersonic flow field computation. Background Hypersonic flow field calculation is a core technology for aircraft design and flow field characteristic analysis in the aerospace field, and the calculation precision and efficiency directly determine the research and development period and reliability. Because the hypersonic flow field has complex unsteady state phenomena such as shock wave-boundary layer interaction, vortex breaking and the like, the grid parameters are required to be dynamically adjusted by depending on an intelligent grid control system, the evolution characteristics of the flow field are adapted, and the calculation accuracy is ensured. In order to improve the computing efficiency, the prior art generally adopts a super-computing multi-core parallel computing architecture, and large-scale grid data is processed through multi-core collaborative parallel processing. However, in the parallel computing process, unavoidable parallel synchronization deviation exists among multiple cores, and the prior art regards the parallel synchronization deviation as unordered interference, and the inherent characteristics and potential values of the parallel synchronization deviation are not deeply explored only through hardware optimization, synchronous instruction reinforcement and other modes for suppression. Meanwhile, the stability of hypersonic flow field calculation depends on stability criteria such as CFL conditions, and the prior art mostly adopts a fixed threshold value or a linear feedback adjustment mode based on flow field physical parameters. A large amount of safety redundancy is reserved for fixing the threshold value, so that the calculation efficiency is obviously lost, obvious hysteresis exists in linear feedback adjustment, calculation divergence is easily caused in critical areas such as steady-unsteady transition of a flow field, and the calculation stability and accuracy cannot be guaranteed. The prior art is not aware of the chaotic characteristic of the parallel synchronous deviation in a specific flow field scene, and a correlation mechanism of the characteristic and a stability criterion is not established, so that the dynamic characteristic of the super-calculation parallel architecture cannot provide support for flow field stability control, and the high-efficiency, accurate and stable calculation requirements of the hypersonic flow field are difficult to meet. Disclosure of Invention The invention aims to provide an intelligent grid control system and method for hypersonic flow field calculation, which are used for solving the problems in the background technology. In order to solve the technical problems, the intelligent grid control system for hypersonic flow field calculation provided by the invention adopts an integrated deep coupling framework of resonance sensing-coupling regulation and control-cooperative adaptation-closed loop verification, and comprises a parallel deviation chaos characteristic sensing and resonance threshold calibration module, a flow field deviation resonance coupling regulation and control module, a resonance coupling cooperative regulation core module, an intelligent grid dynamic resonance adaptation module and a closed loop resonance stability verification and optimization module, which are sequentially connected by signals to form a cooperative regulation and control link, and a controllable resonance coupling mechanism of the hypersonic flow field calculation is established by capturing the chaos characteristic of the hypersonic parallel synchronization deviation, so that the resonance coupling characteristic is converted into an integrated cooperative regulation and control instruction of grid parameters and CFL threshold, and the integrated deep coupling framework is used for hypersonic flow field efficient, accurate and stable calculation. The parallel deviation chaotic characteristic sensing and resonance threshold calibration module comprises a deviation chaotic parameter acquisition sub-module, a chaotic characteristic extraction sub-module and a deviation flow field resonance threshold calibration sub-module, wherein the deviation chaotic parameter acquisition sub-module adopts a time step-core node two-dimensional acquisition strategy to synchronously acquire and super-calculate deviation amplitude, fluctuation frequency and phase difference of each core under each time step, the sampling frequency and flow field calculation time step is mapped by 1:1, the chaotic characteristic extraction sub-module extracts three core parameters of the chaotic intensity, the fluctuation main frequency and the phase stability of the deviation based on an impr