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1 Inlet 2 Outlet BC setup problem

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Old   March 7, 2013, 17:36
Default 1 Inlet 2 Outlet BC setup problem
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Chris L
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Hi all,

I have been working on a software solution to the following problem and thought I may be headed down the wrong road. Any alternate solutions would be great insight.

I have a mesh with 1 inlet and 2 outlets.
Its a two phase problem (alpha/beta).
The solver is multiphase bubbleFoam (OF v2.0).

I have specified alpha phase fraction at the inlet as well as the velocities for both alpha and beta. I have specified the upper (relative to gravity) outlet as fixed value pressure = 0.

I would like to ensure a constant flux for alpha only at the lower outlet.

My current solution is to modify the solver to adjust the p boundary value for the lower outlet continuously to insure a alpha flux of 1/2 of the the inlets alpha flux.

Any ideas or thoughts would be greatly appreciated.
Thanks,
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Old   March 8, 2013, 01:38
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Niklas Nordin
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Quote:
Originally Posted by vbchris View Post
Hi all,

I have been working on a software solution to the following problem and thought I may be headed down the wrong road. Any alternate solutions would be great insight.

I have a mesh with 1 inlet and 2 outlets.
Its a two phase problem (alpha/beta).
The solver is multiphase bubbleFoam (OF v2.0).

I have specified alpha phase fraction at the inlet as well as the velocities for both alpha and beta. I have specified the upper (relative to gravity) outlet as fixed value pressure = 0.

I would like to ensure a constant flux for alpha only at the lower outlet.

My current solution is to modify the solver to adjust the p boundary value for the lower outlet continuously to insure a alpha flux of 1/2 of the the inlets alpha flux.

Any ideas or thoughts would be greatly appreciated.
Thanks,
have you tried to specify a negative massflow inlet (also this requires you to set zero gradient for pressure at that outlet)

Code:
    outlet1
    {
        type                 flowRateInletVelocity;
        value                uniform ( 0 0 0 );
        flowRate           -1;
    }
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