incompressible unbounded flow, open boundary condition, Leith type third order upwind scheme, QUICKEST scheme, Sommerfeld radiation condition, phase speed, stream line, vorticity
Four open boundary conditions for incompressible unbounded flows are evaluated in the framework of the Leith type third order upwind scheme (QUICKEST scheme), and each effectiveness is compared by two means of difference of flows among open boundary conditions and between short and long open boundaries. Three test problems used for the open boundary condition evaluation are the backward facing step flow, the blunt based body flow and the rectangular cylinder obstacle flow in a channel. The investigated open boundary conditions are four. The author proposes to take the uniform inlet velocity as the phase speed in the Sommerfeld radiation condition. As the conclusion, this is shown to be the most excellent open boundary condition among the four open boundary conditions.
On the open boundary conditions for incompressive unbounded flows
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