A large-scale parallel computing surface-to-surface radiation heat transfer algorithm

Abstract

The invention discloses a surface-to-surface radiation heat transfer algorithm suitable for large-scale parallel computing, which comprises the following steps of: after initialization, backing up temperature field data of a structure, and setting an initial value of a cavity temperature; calculating a stiffness matrix and a load vector, and solving a linear equation set to obtain structural temperature distribution; calculating the contribution Qr of the surface-to-surface radiation heat transfer boundary condition to the system heat, judging whether the Qr is within a tolerance range or not,if yes, ending the program, otherwise, recovering the structure temperature field, updating the cavity temperature, and performing calculation again. According to the algorithm, an iteration mode isadopted, the contribution of thermal radiation to system heat energy is analyzed, the numerical value of the cavity temperature is gradually corrected, balance of the system heat is achieved, and therefore large-scale parallel computing of thermal radiation heat transfer between faces is achieved.

Description

technical field [0001] The invention relates to the technical field of finite element engineering numerical simulation calculation and large-scale parallel calculation, in particular to a surface-to-surface radiation heat transfer algorithm suitable for large-scale parallel calculation. Background technique [0002] The finite element method plays an important role in the analysis of actual engineering structures. With the continuous improvement of the requirements for numerical simulation, the structural analysis has gradually developed from the analysis of components and subsystems to the analysis of the whole system, and it is necessary to establish a high-fidelity geometric model and discrete In order to refine the finite element model, these will lead to a large increase in the scale of degrees of freedom, so it is necessary to use the parallel capabilities of high-performance computers to perform calculations. [0003] There are three basic ways of heat energy transfer...

AI Technical Summary

Problems solved by technology

In the surface-to-surface radiation heat transfer analysis, the temperature T of the additional node b is an unknown quantity, which is a quantity after the heat transfer of the object reaches equilibrium. For serial programs, the additional node temperature can be used as the degree of freedom to be obtained, and the additional node temperature can be obtained by solving the equation. However, for parallel programs, in large-scale parallel When calculating, the structure is divided into multiple regions according to the number of CPU cores. Each CPU core only processes the structure of this region to form the stiffness matrix of this region. It is difficult to directly expand the degree of freedom on the overall stiffness matrix.

It is necessary to establish the relationship between the additional nodes and the nodes on the radiation surface, and after parallel partitioning, the radiation surface may be in different CPU cores, so it is difficult to establish the relationship between the additional nodes and each area

Even if the relationship between additional nodes and radiation surface nodes is established in a way similar to rod elements, the amount of parallel communication data will increase during parallel solution, which will bring difficulties to the solution of large-scale linear equations

Images