A modified fractional step method for fluid–structure interaction problems
Visualitza/Obre
10.1016/j.rimni.2015.09.002
Inclou dades d'ús des de 2022
Cita com:
hdl:2117/185827
Tipus de documentArticle
Data publicació2017-01
Condicions d'accésAccés obert
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Reconeixement-NoComercial-SenseObraDerivada 4.0 Internacional
Abstract
We propose a Lagrangian fluid formulation particularly suitable for fluid–structure interaction (FSI) simulation involving free-surface flows and light-weight structures. The technique combines the features of fractional step and quasi-incompressible approaches. The fractional momentum equation is modified so as to include an approximation for the current-step pressure using the assumption of quasi-incompressibility. The volumetric term in the tangent matrix is approximated allowing for the element-wise pressure condensation in the prediction step. The modified fractional momentum equation can be readily coupled with a structural code in a partitioned or monolithic fashion. The use of the quasi-incompressible prediction ensures convergent fluid–structure solution even for challenging cases when the densities of the fluid and the structure are similar. Once the prediction was obtained, the pressure Poisson equation and momentum correction equation are solved leading to a truly incompressible solution in the fluid domain except for the boundary where essential pressure boundary condition is prescribed. The paper concludes with two benchmark cases, highlighting the advantages of the method and comparing it with similar approaches proposed formerly.
CitacióRyzhakov, P. A modified fractional step method for fluid–structure interaction problems. "Revista internacional de métodos numéricos para cálculo y diseño en ingeniería", Gener 2017, vol. 33, núm. 1-2, p. 58-64.
ISSN0213-1315
Versió de l'editorhttps://www.sciencedirect.com/science/article/pii/S0213131515000589
Altres identificadorshttps://www.scipedia.com/public/Ryzhakov_2016a
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