[sangram]

Hello everyone,
I am new to OpenFOAM. I want to solve natural convection problem. I have 3 blocks placed one over other. One of the block is power source. I want to determine the temperature distribution.
How should I proceed?

Thanks & Regards,
Sangram Valkunde

[Saideep]

I guess this should help you out.

https://openfoamwiki.net/index.php/H...ure_to_icoFoam

In short you need to choose a suitable solver for your case. Later if you are developing your case from an isothermal case you need to include the temperature field in order to work over it.

Later, you need to include the temperature into the solver so that the temperature field is being calculated every time step.

Hope this helps;
Saideep

[D_LEE]

Just to add to the answer, you are going to need a density change to drive the flow, or more easily you could use the boussinesq approximation, in which case you add a term next to the external force, something like (someConstant) * g * (T0-T), where T0, g and someConstant are dimensionedScalar or dimensionedVector and T is a volScalarfield exactly like p.

[vsang]

Thank You Saideep and D_Lee.
Do I need to make changes in the source code of solver?
How I should define different material properties to different regions?

Regards,
Sangram

[ssss]

If the boussinesq approximation is valid in your case, you can use the buoyantBoussinesq*Foam solvers, that are included in OpenFOAM, if not you should use DE buoyant*Foam solvers which can take into account more compressibility effects

[Mojtaba.a]

Originally Posted by ssss

If the boussinesq approximation is valid in your case, you can use the buoyantBoussinesq*Foam solvers, that are included in OpenFOAM, if not you should use DE buoyant*Foam solvers which can take into account more compressibility effects

Hi, I am a bit confused by this. It would be a great help if you could answer the following question for me:

What is the difference between buoyant*Foam solvers and rho* solvers? For example the difference between buoyantSimpleFoam and rhoSimpleFoam. Aren't they both compressible? So how come one does include buoyancy effect and one does not? Isn't buoyancy due to change in density which is considered in both solvers?

Thank you,
Mojtaba.

[hoai nguyen]

Hello everyone,

I am a new OpenFOAM users. I am using OpenFOAM to simulate 2D natural convection in square cavity. However, my results is not same benchmark.
My problem: square cavity (0.1x0.1), air inside.
Boundary conditions:
T: Hot temperature is 274K, cold temperature is 273K, top and bottom are adiabatic.
Velocity: v=0
Initial condition:
T =273K
Could you please explain for me?
Thank you so much!

[damu1414]

Hi Hoai Nguyen

Thank you for the post. I was trying to validate the same. I would like to know which OF version you are using and the solver in specific because I came to know from one of the other threads about issues/bugs with OF v7.