
[Sponsors] 
August 6, 2012, 05:20 
Solving transport equations with known velocity field

#1 
Senior Member

Hi.
1) I want to solve 2 transport equations with known velocity field. First i want to solve coupled equations of momentum, energy and mass conservation to compute velocity field and pressure and also temperature. after solving these equations and by known velocity field i want to solve 2 other transport equations. How can i do that in openFoam? 2) my second question is that is there anyway to include heat transfer coefficient in openfoam? or it will be computed automatically? if yes, then how can I find it? 3) I am modeling a room with heat sources which both natural convection and forced convection are significant. my case is incompressible. which solver do u suggest to use and how can i see the effects of forced convection? Regards Mojtaba ~ 

August 6, 2012, 05:49 

#2  
Senior Member
Daniel P. Combest
Join Date: Mar 2009
Location: St. Louis, USA
Posts: 573
Rep Power: 20 
Quote:
2. Not sure 3. buoyantBoussinesqSimplFoam? Give the forum a good search for passive scalar transport, natural convection, buoyancy,.... This will answer all of your questions. Hopefully this will get you started. 

August 6, 2012, 06:08 

#3  
Senior Member

Quote:
1) well i have already seen that tutorials. i want to know how can i solve transport equation after finishing solving for U,p and T. is it possible? regards Last edited by Mojtaba.a; August 6, 2012 at 06:38. 

August 6, 2012, 06:27 

#4 
Senior Member
Daniel P. Combest
Join Date: Mar 2009
Location: St. Louis, USA
Posts: 573
Rep Power: 20 
Yes, its possible. You will need to add your volScalarField for your scalar, formulate the implicit equation and then solve it as usual. If it is strongly coupled with the momentum equation (active) you can solve it inside the PISO/SIMPLE loop and if its a passive scalar (oneway coupled) you can solve it at the end of the timestep.


August 6, 2012, 06:42 

#5  
Senior Member

Quote:
Quote:


August 6, 2012, 07:24 

#6 
Senior Member
Daniel P. Combest
Join Date: Mar 2009
Location: St. Louis, USA
Posts: 573
Rep Power: 20 
Code:
while (simple.loop()) { Info<< "Time = " << runTime.timeName() << nl << endl; p_rgh.storePrevIter(); // Pressurevelocity SIMPLE corrector { #include "UEqn.H" #include "TEqn.H" //<here for active scalar #include "pEqn.H" } turbulence>correct(); //< here for passive scalar that depends on turbulence runTime.write(); Info<< "ExecutionTime = " << runTime.elapsedCpuTime() << " s" << " ClockTime = " << runTime.elapsedClockTime() << " s" << nl << endl; } 

August 6, 2012, 07:43 

#7  
Senior Member

Quote:
Thanks chegdan ~ 

Tags 
heat transsfer, hvac, room, transport equation 
Thread Tools  
Display Modes  


Similar Threads  
Thread  Thread Starter  Forum  Replies  Last Post 
Multiple floating objects  CKH  OpenFOAM Running, Solving & CFD  12  March 21, 2016 14:05 
transsonic nozzle with rhoSimpleFoam  Unseen  OpenFOAM Running, Solving & CFD  7  April 16, 2014 03:38 
High Courant Number @ icoFoam  Artex85  OpenFOAM Running, Solving & CFD  9  January 3, 2012 09:06 
MRFSimpleFOAM goes divergenced!  renyun0511  OpenFOAM Running, Solving & CFD  0  November 19, 2009 03:11 
Problems with simulating TurbFOAM  barath.ezhilan  OpenFOAM  13  July 16, 2009 05:55 