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outflow boundar condition problem, mutiphase flow

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Old   April 29, 2012, 14:11
Default outflow boundar condition problem, mutiphase flow
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Mieszko Młody
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Hello,
I am doing some multiphase flow computations using twoLiquidMixigFoam solver.
Simulation (see attached figure:
computational_domain.jpg
calculates flow with inflow (emergency valves inflow of the fluid1 to the tunnel filled with fluid2 ) and outfolw from the tunnel.

After fluid1 reaches end of the tunnel a problem appears. Because there is a "recirculation zone" trying to leave the tunnel , imposed boundary conditions does not allow it to leave the computational domain, see attached next 3 figures for different time :
recirculation_time_1.jpg
recirculation_time_2.jpg
recirculation_time_3.jpg
I was trying many different BC for velocity (zeroGradient, InletOutlet, mixedDirections) but result/problem is the same...

Does any one know if there is some simple (or any using proper BC) solution for this problem ? To just allow fluid to leave domain, without doing mass at the outflow ??

Best
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Old   April 29, 2012, 14:27
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Mieszko Młody
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interesting is , that after setting (gravity) g = 0, problem disappears ...
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