Abstract
We introduce a domain decomposition method for simulating 2D external, incompressible viscous flows. In each subdomain that is close to a connected physical boundary, the velocity and the pressure are approximated on a body fitted, finite difference grid. In the subdomain that is far from the solid boundary (i.e., the neighborhood of infinity), we develop a characteristics method to approximate the velocity and the vorticity on a Cartesian grid. The two methods are coupled by means of a Schwarz type strategy. This method is tested by simulating the flow past one or two cylinders. Some tests are performed with moving cylinders. Comparisons with numerical and experimental data illustrate the efficiency of the method.
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