ANALYSIS OF A COUPLED FLUID-STRUCTURE MODEL WITH APPLICATIONS TO HEMODYNAMICS

作者：Rebollo T Chacon^*; Girault V^*; Murat F^*; Pironneau O^*

来源：SIAM Journal on Numerical Analysis, 2016, 54(2): 994-1019.

DOI：10.1137/140991509

• fluid-structure interaction
• compliant walls
• finite element method
• convergence analysis
• Navier-Stokes equations
• blood flow

We propose and analyze a simplified fluid-structure coupled model for flows with compliant walls. As in [F. Nobile and C. Vergara, SIAM J. Sci. Comput., 30 (2008), pp. 731-763], the wall reaction to the fluid is modeled by a small displacement viscoelastic shell where the tangential stress components and displacements are neglected. We show that within this small displacement approximation a transpiration condition can be used which does not require an update of the geometry at each time step, for pipe flow at least. Such simplifications lead to a model which is well posed and for which a semi-implicit time discretization can be shown to converge. We present some numerical results and a comparison with a standard test case taken from hemodynamics. The model is more stable and less computer demanding than full models with moving mesh. We apply the model to a three-dimensional arterial flow with a stent.

• 出版日期2016