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Combined interface boundary condition method for unsteady fluid-structure interaction
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DOI：10.1016/j.cma.2010.06.039.png)
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摘要
En 中文
Traditionally, continuity of velocity and traction along interfaces are satisfied through algebraic interface conditions applied in a sequential or staggered fashion. In existing staggered procedures, the numerical treatment of the interface conditions can undermine the stability and accuracy of coupled fluid-structure simulations. This paper presents a new loosely-coupled partitioned procedure for modeling fluid-structure interaction called combined interface boundary condition (CIBC). The procedure relies on a higher-order treatment for improved accuracy and stability of fluid-structure coupling. By utilizing the CIBC technique on the velocity and momentum flux boundary conditions, a staggered coupling procedure can be constructed with similar order of accuracy and stability of standalone computations for either the fluids or structures. The new formulation involves a coupling parameter that adjusts the amount of interfacial traction in the form of acceleration correction, which plays a key role in the stability and accuracy of the coupled simulations. Introduced correction terms for velocity and traction transfer are explicitly added to the standard staggered time-stepping stencils based on the discretized coupling effects. The coupling scheme is demonstrated in the classical 1D closed- and open-domain elastic piston problems, but further work is needed to consider the analytical stability of these schemes, 3D problems and comparison to monolithic integration. (C) 2010 Published by Elsevier B.V.
Keyword:
Fluid-structure interaction
Staggered scheme
Stability
Interface conditions
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IF:
7.3
论文数:
1.3W
被引数:
5.6W
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