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Advective BC with specified direction (outlet-velocity)

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Old   August 19, 2018, 21:50
Default Advective BC with specified direction (outlet-velocity)
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Gazi Yavuz
Join Date: Apr 2018
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Hello dear all,

I try to simulate flow over a Low Pressure Turbine Blade. For my case, i use pisoFoam solver in a full structured domain having cyclic conditions on two faces along y direction, inlet and outlet along x direction, a casing wall and symmetryPlane along z direction. I ran a few seconds of calculation in OpenFoam and checked the analysis but noticed that there is a problem about the direction that flow goes through at the outlet. At the inlet For the velocity, i have defined
 type fixedValue;
value uniform ( 0.79 0.61 0);
At the outlet, i specified

type advective;
As a result of that, flow is leaving the domain as the same angle as inlet velocity enters the domain. However, the designed exit flow angle is -63,2 degree. Before the analysis, i thought that flow would leave the domain with that angle on its own but now i clearly saw that i should specify that direction somehow. Thus, i must give some detail to the advective outlet so that flow would leave the domain with that angle or change my boundary condition at the outlet.
I contemplated that i could perhaps change something about the outlet for P however it s a scalar quantity, to which i cannot define direction. It seems the trick is about the velocity.
Do you know how to specify a direction to the outlet for advective bc or have any other solution to that problem? I just should direct the flow, should not specify a value.

Best regards.
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advective bc, les, pisofoam

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