Study On Numerical Method Of Fluid-Structure Interaction Based On OpenFoam

Fluid-structure interaction (FSI) phenomenon exists widely in the aerospace, impeller machinery, civil engineering, petrochemical industry, clean energy, and many other fields. The numerical simulation of fluid-structure interaction and other multi-physics coupling problems has drawn wide attention over the last decade. For the diversity of FSI problem, using the partitioned approach for numerical simulation of FSI problem has become the main trend more and more now.IQN-ILS algorithm is an implicit algorithm of FSI which belongs to partitioned approach. Compared with the traditional fixed point iteration algorithm, it yields a faster convergence rate. However, IQN-ILS can’t guarantee the stability of the calculation in some case, for example, the pipe flow simulation. For this deficiency, two kinds of improved algorithms that one is introducing the relaxation factor to IQN-ILS and the anther is combining Aitken with IQN-ILS are proposed.In development of new solver, firstly, based on the original FSI solver of OpenFoam which is an open source library of finite volume method developed by C++, the code of coupling part is added, the IQN-ILS FSI solver is developed. Secondly algorithm and the two new solvers based on proposed two kinds of improved algorithms are developed, the programs of two new solvers are divided into two versions, python and C++ code. In addition, a new solver that can simulate the FSI problem of free surface flow has been developed.The effectiveness of new solvers developed in this paper is verified by the benchmark. The convergence rate of different coupling algorithms are compared by using a two dimensional numerical example. Finally, the two improved algorithms are applied to the three dimensional pipe flow, the results indicate that the improved algorithms could enhance the computational stability and achieved good results.