[agustinvo]

Hello!

I am setting up a natural convection boundary layer, where I impose a heat source (heat flux or fixed temperature) at a wall, but I don't know if the set up I am planning is good enough.

In the figure you can see my initial set up, and I will use buoyantBoussinesqPimpleFoam. The BC's I am imposing are:

• Velocity
  • Wall = [0 0 0]
  • Inlet & outlet = zeroGradient
  • Free Stream = zeroGradient
• Temperature
  • Wall = fixedTemperature_1 or turbulentHeatFluxTemperature
  • Inlet = fixedTemperature_2 (fixedTemperature_1>fixedTemperature_2)
  • Free Stream = zeroGradient
• k,epsilon, nut: low Re correction at the wall, zeroGradient in the rest of boundaries
• p_rgh: equal to 0 at inlet, zeroGradient in the rest of boundaries

I am wondering if I should move to fixedValues in the Free Stream boundary (T_inf and U=[0 0 0]), but I don't like this idea since it will affect my boundary layer profiles, and setting very far from the wall this boundary can be done at this moment, but not in the future (LES simulations are planned).


If you think that I could improve my simulation by modifying some parameters, I would be grateful! Thank you!

[dodobenq]

Hey Agustín,

I want to simulate the same case. Do you have some News? Do you have improved/modified your parameters?

Kind Regards!

[agustinvo]

Hello Dominik,

I am still dealing with the boundary conditions. I am imposing inletOutlet for temperature in the free stream region and inlet, and a zeroGradient at the outlet.

For velocity I set zeroGradient, and the pressure is now my problem. Recently I have know about fixedFluxPressure and buoyantPressure (the last one not available in 2.3.x), and I want to use them and see their effect.

In the other hand, the solver is always a pain. I have developed an incompressible solver which is not working ok at all, and there is other option: to use buoyantPimpleFoam with an incompressible configuration.

And you? How is it going on?

[kishore208]

Hi Agustin
I am working on the same problem, but I am facing problems to give boundary conditions for pressure and velocity at inlet and outlet.
Please share the boundary conditions.