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August 26, 2007, 11:28 |
Hi guys,
I used lesInterFoam
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#1 |
New Member
morteza
Join Date: Mar 2009
Posts: 18
Rep Power: 17 |
Hi guys,
I used lesInterFoam to simulate flow around a wedge. My boundary conditions are as follows: Top and bottom boundaries are SYMMETRY Left boundary is INLET Right boundary is OUTLET wedge boundary is WALL I choose gamma=1 for both internal field and inlet value to disable the 2nd phase. Uinlet=100 m/s poutlet=1.0e5 pas rho=1000 nu=1.0e-6 But after solution the pressure is negative. |
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August 26, 2007, 11:39 |
If the flow can be approximate
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#2 |
Senior Member
Srinath Madhavan (a.k.a pUl|)
Join Date: Mar 2009
Location: Edmonton, AB, Canada
Posts: 703
Rep Power: 21 |
If the flow can be approximated as being incompressible, then I don't see anything wrong with the pressure being negative as only the pressure difference drives the flow.
Is the velocity field unphysical? |
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August 26, 2007, 11:45 |
Hi Madhavan,
thanks for your
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#3 |
New Member
morteza
Join Date: Mar 2009
Posts: 18
Rep Power: 17 |
Hi Madhavan,
thanks for your reply How can i make this negative pressure to possitive values. I want to implement a cavitation model and must have possitive pressure. thanks in advance |
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August 26, 2007, 12:09 |
I forgot to mention it.
I sol
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#4 |
New Member
morteza
Join Date: Mar 2009
Posts: 18
Rep Power: 17 |
I forgot to mention it.
I solved this case with oodles that is an incompressible solver, but there was no negative pressure. Morteza |
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August 26, 2007, 12:13 |
Perhaps by modifying the posit
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#5 |
Senior Member
Srinath Madhavan (a.k.a pUl|)
Join Date: Mar 2009
Location: Edmonton, AB, Canada
Posts: 703
Rep Power: 21 |
Perhaps by modifying the position and/or the value of reference pressure in the lesInterFoam code. I think, the following line in pEqn.H does that:
pdEqn.setReference(pdRefCell, pdRefValue); Check it out. Alternately, an easier way would be to add a sufficiently large quantity to the entire phase pressure field after each time-step and calling this new variable something else (say pve_pd) and using this in your model. Bear in mind that I know nothing about cavitation modeling and I could very well be misleading you here. Please wait for a more experienced user to comment. |
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