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

Autor: Li-Chieh Chen, Mei-Jiau Huang
Rok vydání: 2017
Předmět:
Zdroj: Journal of Computational Physics. 330:749-769
ISSN: 0021-9991
DOI: 10.1016/j.jcp.2016.10.050
Popis: 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. The direct-forcing fictitious domain method and the spectral element method are combined.Direct interpolation of Eulerian variables onto Lagrangian mesh is not necessary.Non-fluctuating pressure fields are obtained with a smoothed pseudo body force.The proposed method possesses a spectral accuracy.Both small and large solid-to-fluid density ratios are applicable.
Databáze: OpenAIRE
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