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An accurate integral equation method for simulating multi-phase Stokes flow. (English) Zbl 1349.76635
Summary: We introduce a numerical method based on an integral equation formulation for simulating drops in viscous fluids in the plane. It builds upon the method introduced by Kropinski in 2001 , but improves on it by adding an interpolatory quadrature approach for handling near-singular integrals. Such integrals typically arise when drop boundaries come close to one another, and are difficult to compute accurately using standard quadrature rules. Adapting the interpolatory quadrature method introduced by Helsing and Ojala in 2008 to the current application, very general drop configurations can be handled while still maintaining stability and high accuracy. The performance of the new method is demonstrated by some challenging numerical examples.

MSC:
76M25 Other numerical methods (fluid mechanics) (MSC2010)
65R20 Numerical methods for integral equations
45E05 Integral equations with kernels of Cauchy type
76D07 Stokes and related (Oseen, etc.) flows
76Txx Multiphase and multicomponent flows
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