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November 9, 2011, 01:07 |
Need help on Boundary Condition
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#1 |
New Member
S Park
Join Date: Oct 2011
Posts: 2
Rep Power: 0 |
Hello,
I'm still learning about OpenFoam, and I need some helps. I want to model a converging flow, so there are two inlets coming in and a single outlet. However, instead of assigning velocity differences at inlets and outlets, I want to make this a pressure-driven flow (thus assigning only pressure values and possibly assigning velocity values as zeroGradients) - and two inlets should have different initial pressure values. So any suggestions for good boundary conditions for two inlets and an outlet? Thank you in advance. |
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December 8, 2011, 17:27 |
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#2 | |
Senior Member
Daniel P. Combest
Join Date: Mar 2009
Location: St. Louis, USA
Posts: 621
Rep Power: 0 |
Quote:
http://www.cfd-online.com/Forums/ope...-inlet-bc.html and http://www.cfd-online.com/Forums/ope...-openfoam.html and then search the forum a little more for "pressure inlet" I do remember that specifying pressure at the inlet, it is very easy to create hypersonic flow (not sure where I read that)...so be careful. Also, remember that if you use solvers like simpleFoam, the value you are specifying is actually pressure divided by fluid density. Cheers, |
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April 26, 2012, 08:15 |
Need help boundary conditions using groovyBC
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#3 |
New Member
Darwin
Join Date: Apr 2012
Posts: 2
Rep Power: 0 |
Hi guys,
I´m pretty new in OpenFoam (i m using Openfoam2.1). I consider the geometry of a cylinder and i would like to simulate a swirling turbulent flow (LES Simulation). I want to change the entry condition for the velocity field with the following expression: (i want a tangetial velocity profil which depends on radius) " variables: Ur (radial velaocity), Ut (tangential velocity), r_vc (radius of the vortex), v_max (maximal velocity) expression: for 0 < radius < r_vc Ur = V_max * radius / r_vc for r_vc < radius < R (radius of the cylinder) Ur = V_max *r_vc / radius" Thanks in advance for your help !! |
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April 26, 2012, 09:42 |
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#4 | |
Senior Member
Daniel P. Combest
Join Date: Mar 2009
Location: St. Louis, USA
Posts: 621
Rep Power: 0 |
Quote:
This is usually my go to answer on these, but why not try groovyBC (http://openfoamwiki.net/index.php/Contrib_groovyBC) or go ahead and install swak4foam (http://openfoamwiki.net/index.php/Contrib/swak4Foam) to get even more tools, and look at http://www.cfd-online.com/Forums/ope...locity-bc.html that will cover it for you. As always, use your search skills on the forum. Good luck. |
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