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Regarding problem with the buoyantBoussinesqPimpleFoam solver. |
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March 21, 2018, 09:38 |
Regarding problem with the buoyantBoussinesqPimpleFoam solver.
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#1 |
New Member
Vishwajit Kumar
Join Date: Jun 2017
Posts: 6
Rep Power: 9 |
Hello everyone.
I am trying to simulate flow in a nozzle using the buoyantBoussinesqPimpleFoam solver. But at the outflow i am getting back-flow. I have tried all the possible boundary condition. I am also attaching the case file for the reference and the screenshot the problem that i am getting. the screen shot attached shows the problem at the outlet..where instead of getting the fully developed profile i am getting two recirculating zones. Thank you in advance. |
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March 22, 2018, 22:41 |
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#2 |
Senior Member
Join Date: Aug 2015
Posts: 494
Rep Power: 15 |
Try an inletOutlet condition for your velocity at the outlet.
Caelan |
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March 23, 2018, 01:57 |
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#3 |
Senior Member
Uwe Pilz
Join Date: Feb 2017
Location: Leipzig, Germany
Posts: 744
Rep Power: 15 |
If you use an outflow b.c. you should have an outflow stream there: The flow should not contain any backflow components. The flow property you set (zeroGradient) should be realized by the flow itself.
I recommend to simulate a longer region for stabilizing the flow. Usual, 10 times the size of obstacles is the required minimum. You don't have an obstacle, so I recommend 10 times the size of the large eddies.
__________________
Uwe Pilz -- Die der Hauptbewegung überlagerte Schwankungsbewegung ist in ihren Einzelheiten so hoffnungslos kompliziert, daß ihre theoretische Berechnung aussichtslos erscheint. (Hermann Schlichting, 1950) |
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March 26, 2018, 02:20 |
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#4 | |
New Member
Vishwajit Kumar
Join Date: Jun 2017
Posts: 6
Rep Power: 9 |
Quote:
Thank you for the suggestions. I will try to implement it. |
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March 26, 2018, 02:20 |
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#5 |
New Member
Vishwajit Kumar
Join Date: Jun 2017
Posts: 6
Rep Power: 9 |
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Tags |
boundarycondition, buoyantboussinesq, openfoam, pimplefoam |
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