采用快速动网格技术的时空同步流固耦合算法

摘要

To reduce the computing time for fluid-structure interactions,a time-space synchronizing fluid structure coupling method is developed in this paper.During each coupling iteration,the RANS (Reynolds Averaged Navier Stokes) equations are solved firstly.Then the nodal displacement of the structure and flow meshes are calculated using a fast dynamic mesh technique proposed by the authors' research team.The flow mesh is updated and the flow and structural vibrations are space-synchronously computed.In each time step,the convergence of the flow calculation is accomplished using coupling iterations and the convergence of the structural vibration analysis is accomplished synchronously.The flow and structural vibration are time-synchronously computed.The fluid structure coupling vibration response of an elastic beam is computed and the wing 445.6 flutter boundary was predicted with the proposed method.The results in this paper agree well with the data reported in other literatures.The computing time is reduced by 81.2％ compared with the pre-existing time synchronized fluid structure coupling method reported in other literatures.%为了减少流固耦合计算时间,发展了一种时空同步流固耦合算法.在每一次耦合迭代中,首先求解RANS(Reynolds Averaged Navier Stokes)方程,然后采用本课题组所提出的快速动网格技术计算结构及流场网格节点位移,并更新流场网格,实现流场与结构振动的空间同步求解.在每一时间步,通过多次耦合迭代,使流场计算收敛,同时保证结构振动计算的收敛,实现流场与结构振动的时间同步求解.采用该算法对弹性梁流固耦合振动及Wing 445.6颤振问题进行了研究,计算结果与文献中的结果一致.与已有文献的时间同步算法相比,此算法可以减少计算时间81.2％.