耦合对流换热分区求解收敛特性分析

Based on ANSYS FLUENT commercial CFD codes, the numerical investigation was performed on conjugate convective heat transfer. An alternative computation method was used to investigate conjugate convective heat transfer problem, with the coupling of boundary conditions. Convergence characteristics, error propagation were theoretically analyzed and main influence factors upon the numerical iteration procedure were revealed. The results show that the ratio of convective heat transfer coefficient (RCHTC) has a great impact upon convergence characteristics. The computation could lead to converged result only under the case of the ratio smaller than 1 and the smaller the ratio, the faster the convergence. Meanwhile, the results show that the convergence characteristics of iteration depend on the type of boundary conditions to chose and the choice of initial calculating domain. In addition, an improved strategy was proposed to deal with the divergence situation with complex RCHTC distribution, and the results show good convergence behavior and better speed. At last, the results from partitioned solution were compared to those from monolithic solution, and perfect agreements were found, which indicates that the numerical method is right.