Solving transport equations with known velocity field
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 ~ 
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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. 
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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 
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.

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while (simple.loop()) 
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Thanks chegdan ~ 
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