[Mondal131211]

Hi all,

I have preliminary knowledge about turbulence modeling. Currently, I am trying to reproduce a result.
"Natural convection flow along a heated vertical plate"

Please have a look in the picture attached here. Everything is fine when dealing with laminar flow. But the problem arises when I try to introduce turbulence the simulation crushed. I can understand this may be because of applying the wrong BC of turbulence modeling. As I said before, I am like new in turbulence modeling. In my model, a heated plate is placed just middle of an external domain. The external domain should behave like atmosphere. In order to solve the problem, I am using buoyantPimpleFoam (solver of OpenFOAM 3.0.1). Can anyone suggest me what will be the realistic atmospheric BC for this problem? I am continuously struggling with that. This might be a simple solution for someone. Anyways, please comment or give me any thread that will help me to solve this problem.

Note that: Picture attached here for the laminar case.

Cheers
Razon

[yambanshee]

I think this post would be more applicable in the pre-processing forum.

I would suggest using the inletOutlet boundary condition, where the inlet value is based on a turbulence intensity and length scale. For appropriate calculators, see this tool: https://www.cfd-online.com/Tools/turbulence.php

The inletOutlet BC is handy in that for outflow, a zeroGradient condition is applied, but for inflow a value is specified. This normally leads to a stable solution, and makes a reasonable amount of sense in the physical world.