Pressure-based viscous flow computation using multiblock overlapped curvilinear grids

A pressure-based multiblock computational method is developed for solving the incompressible Navier-Stokes equations in general curvilinear grid systems. A conservative interface scheme is devised with desirable accuracy to handle the information transfer between blocks. The scheme is based on the semiimplicit-type flow solver with the staggered grid. Issues concerning discontinuous grids, global mass conservation, viscous term treatment, and boundary conditions at the grid interface are addressed. The method is tested for two flow problems, a curved channel flow and a bifurcated channel flow. The calculations demonstrate that, besides maintaining desirable solution characteristics across discontinuous grid interfaces, the present multiblock algorithm can achieve convergence rates comparable to that of the single-block algorithm, yielding an improved computational capability for treating complex flow problems.

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