Numerical Solution for the Time-Dependent Two-Dimensional Viscous F1ows past Obstacle : Part 2,Flow past an Obstacle in a Uniform Flow

概要

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A numerical method is presented for analysing the unsteady 2-D incompressible laminar flows past an obstacle in a uniform flow. In general, in the methods using the stream function and the vorticity, a unique solution can be obtained only taking account of the one-valued pressure condition. In Part 2,first the method to satisfy this condition for the duct flows proposed in Part 1 is extended to the flows past in obstacle in a free stream. For such flows, it is also important how to treat the outer boundary condition. Therefore, next a pitching method is proposed in which outside of the outer boundary a potential flow is supplemented, the flow is solved analytically, and the solution is patched smoothly to the inside numerical solution. By the mithod the solution satisfying the uniform flow condition accurately can be obtained in a relatively short computer time.
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