A DFFD simulation method combined with the spectral element method for solid-fluid-interaction problems

作者：Chen Li Chieh; Huang Mei Jiau^*

来源：Journal of Computational Physics, 2017, 330: 749-769.

DOI：10.1016/j.jcp.2016.10.050

• Direct forcing fictitious domain
• Immersed boundary
• Spectral element method
• Sub-cell scheme

A 2D simulation method for a rigid body moving in an incompressible viscous fluid is proposed. It combines one of the immersed-boundary methods, the DFFD (direct forcing fictitious domain) method with the spectral element method; the former is employed for efficiently capturing the two-way FSI (fluid-structure interaction) and the geometric flexibility of the latter is utilized for any possibly co-existing stationary and complicated solid or flow boundary. A pseudo body force is imposed within the solid domain to enforce the rigid body motion and a Lagrangian mesh composed of triangular elements is employed for tracing the rigid body. In particular, a so called sub-cell scheme is proposed to smooth the discontinuity at the fluid-solid interface and to execute integrations involving Eulerian variables over the moving-solid domain. The accuracy of the proposed method is verified through an observed agreement of the simulation results of some typical flows with analytical solutions or existing literatures.

• 出版日期2017-2-1