基于浸入边界法的涡激振动流固耦合数值模拟方法

针对涡激振动的精确数值模拟,基于浸入边界法建立了一种处理涡激振动问题的流固耦合分区迭代数值求解模型,采用浸入边界方法处理振动结构的移动边界,并在Navier-Stokes方程中添加附加体力项以体现流固之间的相互作用.为实现流体与固体之间的强耦合作用,采用分区算法,在同一时间步内进行多次迭代求解直至收敛.为验证该方法,选...

Immersed boundary approach-based method for numerical simulation of fluid-solid interaction of vortex-induced vibration

Aiming at the accurate numerical simulation of vortex-induced vibration，a fluid-solid interaction-partition iteration numerical solution model for dealing with the problem of vortex-induced vibration is established herein based on the immersed boundary approach，from which the moving boundary of vibrating structure is dealt with the immersed boundary approach，and then the interaction between fluid and solid is reflected through adding additional physical items into Navier-Stokes equations． In order to realize the strong interaction between fluid and solid，the partitioning algorithm is adopted to carry out several times of iterations within the same time step until convergence． For verifying the method proposed herein，two calculation cases，i． e． the flow around a stationary cylinder and the 8-shaped vortex-induced vibration of a circular cylinder，are chosen to be compared with the results obtained the relevant previous experiments and numerical calculations． The results show that the method has better applicability，effectiveness and accuracy for dealing with the problem of the vortex-induced vibration． The study result can provide an effective calculation method for the accurate simulation of the vortex-induced vibration within the engineering field concerned．