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Katabatic flow using buoyantboussinesqpisofoam |
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April 18, 2013, 11:30 |
Katabatic flow using buoyantboussinesqpisofoam
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#1 |
New Member
Join Date: May 2011
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Hi all,
I am using a bouyantBoussinesq solver (LES) to model a katabatic wind flow along a slope. The surface temperature (wall) is slightly cooler than the overlying stably stratified atmosphere (see figure 1). I like to use cyclic boundary conditions for the left and right patch, in order to get a fully developed turbulent wind field. Since the inlet and outlet are not at the same height, this causes a jump of the pressure field (see picture 2). It is probably not possible to use a cyclic boundary condition here, or is there a way to solve this problem? The other solution might be to rotate the frame of reference by aligning the x-axis with the slope, but I am not quite sure how to do this. Thank you in advance Tobias |
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April 19, 2013, 04:43 |
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#2 |
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Nima Samkhaniani
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you can use cyclic BC with pressure Jump, pressure Jump can be accessed by fan type BC at inlet-outlet, search in forum about fan BC
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April 19, 2013, 05:05 |
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#3 |
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Hi Nima Sam,
Thank you very much for your response. I'll check it out. Cheers, Tobias |
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April 19, 2013, 10:09 |
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#4 |
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Hi Niam,
I have applied the following boundary conditions to the left and right patch, respectively. But the result is still the same. Do I make something wrong? Code:
left { type fan; patchType cyclic; jump uniform 0; f 2(100 -1.0); value uniform 0; } right { type fan; patchType cyclic; jump uniform 0; f 2(100 -1.0); value uniform 0; } Tobias |
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Tags |
buoyantboussinesqpisofoam, cyclic boundaries, les model, pressure boundary |
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