油浸式变压器电磁-热-流多物理场耦合模型的自适应有限元方法OA

This study investigates the numerical solution of the coupled electromagnetic-thermal-fluid multiphysics model inside oil-immersed power transformers.To reduce the complexity of the actual geometric configuration,the transformer is simplified to a representative three-dimensional single-phase structure.A Picard linearization strategy is employed to decouple the strongly coupled system,thereby splitting the full multiphysics model into an alternating iterative framework consisting of the electromagnetic A-V-A formulation and the thermo-fluid coupled equations.Based on this decomposition,efficient solvers for each individual physical field are developed by combining the backward Euler time discretization with an adaptive finite element method,enabling the treatment of nonlinearities,coefficient jumps,and highly irregular subdomains inherent in the model.Finally,these single-field adaptive solvers are incorporated into the overall coupling procedure,yielding a unified adaptive finite element algorithm tailored for the multiphysics system of oil-immersed transformers.