双向流固耦合动态换热的分析方法

Double-sided fluid-structure coupling dynamic thermal analysis method

为解决以往单向流固耦合方法难以实现动态物理量的传递以及强耦合方法中耦合方程解耦困难等问题,获得了与实际情况较为吻合且可以选取优势求解器的双向流固耦合分析方法。本文以发动机排气歧管的流固耦合换热分析为例,通过MpCCI双向流固耦合接口将有限元分析软件Abaqus与CFD软件Fluent进行连接,实现了动态数据交换的流固耦合传热分析;该方法与单向流固耦合分析方法相比更能与实际相吻合,且不存在强耦合方法中的解耦困难问题。本文还针对耦合计算的特点,提出了求解优化方案,此方案可以减少CFD软件多次的残差迭代中结构求解器的低速求解所带来的时间损耗,本文的案例计算效率提高达500%,有效缩短了产品开发周期。

In order to overcome the traditional fluid-structure interaction analysis unidirectional coupling, or deficiencies in the strong coupling, to search an analysis method easier and more consistent with the actual fluid-structure interaction situation is needed. In present contribution, take the fluid-solid coupled heat transfer analysis of the engine exhaust manifold as an example, to solve the fluid-structure coupling thermal by connecting the FEM software Abaqus and CFD software Fluent through fluid-structure coupling program MpCCI software. Results obtained are coinciding with actual values better than other methods. Furthermore, the optimization method is put forwarded based on the feature of fluid-structure coupling. Using this optimization method, the time consumption which brings by low structural solver in the CFD residuals iterative processing can be eliminated and the simulation efficiency can be improved up to 500% for the engine exhaust manifold example. Thus the development cycle of the product can be shortened effectively.