Multiphysics Coupling Simulation Method Based On MOOSE Framework

With the development of electronic devices towards integration,the multi-physical coupling effect between components and layers becomes more and more obvious.This situation places higher demands on the simulation method.The current multi-physics simulation is based on the data transfer between multiple physical simulation tools,which needs to solve the problems of data interface and heterogeneous grid mapping between different platforms.Not only that,but the coupled algorithms such as fixed-point iteration used in this method often have problems in solution efficiency,accuracy and convergence.Moreover,commercial simulation tools focus on general applications,and it is difficult to define individualized specific physical problems.In view of the above problems,this paper studies the multiphysics simulation method based on the open source simulation framework MOOSE(Multiphysics Object-Oriented Simulation Environment),including the following aspects:(1)Research on the principles and characteristics of the MOOSE simulation framework: The underlying architecture,physical module implementation,workflow,multiphysics modeling method and JFNK algorithm of the MOOSE framework are introduced.According to the theoretical research,a scheme of the framework for multifield coupling of electronic equipment is proposed.Then,according to the principle of full coupling of the framework,the verification and validation route of applying the MOOSE framework to electronic devices is established.Finally,according to the characteristics of the JFNK algorithm,the algorithm evaluation route is formulated.(2)Research on the construction and verification of physical simulation modules based on MOOSE framework: A multi-physics simulation application LABM1 covering fluid,thermal and mechanical modules is built using frame components.The calculation results of this program are then used to compare with commercial software,literature or theoretical solutions to verify the kernel of the physics module to confirm that the kernels are correct to support the establishment of a multi-field coupling method.Finally,the calculation accuracy and efficiency of JFNK algorithm and ordinary Newton method in each physical module are compared.The results show that the fluid,thermal and mechanical modules of LABM1 have high computational accuracy,but the computational efficiency is weaker than that of Newton's method,and further optimization is needed.(3)Research on multi-physics coupling simulation method based on MOOSE framework: After the coupling kernel is added to the verified physics modules,the fluid heat transfer and thermo-mechanical fully coupled methods are established,and the accuracy of the method is validated by benchmark cases.Subsequently,comparing the results of LABM1 with commercial software,and validating the feasibility of the simulation method for small-scale computing on a set of scaled models.Finally,the accuracy and efficiency of JFNK algorithm and Newton algorithm with different preprocessing methods in conjugate heat transfer and thermo-mechanical coupling calculation are compared.The results show that in the thermal-mechanical coupling,the displacement of LABM1 is consistent with the literature results.In the coupled calculation at the scale of meters to hundreds of microns,the temperature results and displacement results are consistent with commercial software,proving that LABM1 can be used for small-scale electronic device simulation.This paper studies the multiphysics coupling simulation method based on the MOOSE framework,and solves the feasibility of applying the MOOSE framework to the multiphysics simulation of electronic device.A scheme including pre-and postprocessing,kernel syntax,fully coupled implementation and error analysis is proposed.The kernels of the simulation are verifed and the accuracy of the method is validated using benchmark cases,commercial software and analytical solutions.In addition,the availability of the calculation results at the scale of meters to hundreds of microns is validated.Finally,the computational efficiency of JFNK and Newton method with different preprocessing in conjugate heat transfer,thermo-mechanic coupled scenarios is studied,which provides effective support for the realization of complex coupling of electronic devices based on this framework in the future.