Acta mathematica scientia,Series A ›› 2020, Vol. 40 ›› Issue (5): 1362-1380.

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A Viscosity-Splitting Finite Element Method for the Fluid-Fluid Interaction Problem

Wei Li(),Pengzhan Huang*()   

  1. College of Mathematics and System Sciences, Xinjiang University, Urumqi 830046
  • Received:2019-07-10 Online:2020-10-26 Published:2020-11-04
  • Contact: Pengzhan Huang E-mail:lywinxjst@yeah.net;hpzh007@yahoo.com
  • Supported by:
    the NSFC(11861067)

Abstract:

In this paper, a fully discrete viscosity-splitting finite element method is developed and studied for the fluid-fluid interaction model. This method applies decomposition technique of viscosity in time and mixed finite element method in space, where the temporal term includes two steps. In the first step, a backward Euler scheme is utilized for the temporal discretization, semi-implicit scheme is applied for the nonlinearity term and the geometric averaging method is used to deal with the fluid interface. Then, in the second step, we only solve a linear Stokes problem without spatial iteration per time step for each individual domain. Hence, the viscosity-splitting finite element method splits nonlinearity and incompressibility. Moreover, the stability and convergence of the method are established by rigorous analysis. Finally, numerical experiments are presented to show the performance of the proposed method.

Key words: Fluid-fluid interaction model, Viscosity-splitting method, Stability, Convergence, Finite element method

CLC Number: 

  • O242
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