# Integral Equation to Foam Equation

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 October 25, 2011, 14:32 Integral Equation to Foam Equation #1 New Member   Thilo Michels Join Date: Oct 2011 Posts: 11 Rep Power: 8 Hi Everyone, can someone please tell me, if I have implemented my equation right? As this is my first task I implement into openFoam, I'm not sure wether there are errors in my code which is running so far, but crashes after some timesteps. My Equation is: with f: velocity times density U: velocity p: pressure My OpenFoam code is: fvVectorMatrix aFEeqn ( fvm::ddt(aF) + fvm::div(ac_phi,aF) + rho * fvc::div(ac_phi_2,U) + fvc::grad(aP) ); Thank you very much in advanced, Thilo Last edited by Thilo; November 23, 2011 at 05:06. Reason: Equation in latex form

 November 22, 2011, 19:01 #2 Senior Member     Daniel P. Combest Join Date: Mar 2009 Location: St. Louis, USA Posts: 614 Rep Power: 22 You may have answered this already, but to make your question a little clearer...why not write it using latex (http://www.cfd-online.com/Forums/sit...ne-forums.html). Code: \oint_{S} \vec{U}\vec{U}\cdot \hat{n}dA produces see link above for more explanation __________________ Dan Find me on Twitter @dancombest LinkedIn WordPress

 November 24, 2011, 04:17 #3 Senior Member   Cyprien Join Date: Feb 2010 Location: Stanford University Posts: 262 Rep Power: 12 What about the pressure equation ? Indeed, your equation depends on the pressure field. Consequently the pressure must be evaluated elsewhere. The classical method is to use SIMPLE or PISO algorithms.. (cf simpleFoam or pisoFoam or icoFoam) regards, Cyp

 November 24, 2011, 05:53 #4 New Member   Thilo Michels Join Date: Oct 2011 Posts: 11 Rep Power: 8 Hi Cyp, thanks for this advice. Indeed there is a pressure and a density equation, which I didn't mention. I was not shure, if I implemented the mentioned equation right and I didn't want to ask for to much help. Meanwile I solved my problem! With kind regards, Thilo

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