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Problems with 3D turbulent flow
Posted Mar 28, 2011, 2:43 a.m. EDT Fluid & Heat, Computational Fluid Dynamics (CFD) Version 4.1 1 Reply
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Hi All,
I have been trying to use comsol to study turbulent flow in a 3D domain. The Reynolds number is around 470.000, so we are talking about fully turbulent flow.
I can get under control the wall lift-off distance, both dimensional and dimensionless, and I do obtain a solution.
Unfortunately the solution is quite wrong: there is a large difference between the computed pressure drop and what is actually measured on the test bench. The numerically computed head loss is about 0.12 bar with comsol, the actual pressure drop is about 0.54 bar.
Has anyone experienced similar problems while using the CFD package?
Here is the model:
I have been trying to use comsol to study turbulent flow in a 3D domain. The Reynolds number is around 470.000, so we are talking about fully turbulent flow.
I can get under control the wall lift-off distance, both dimensional and dimensionless, and I do obtain a solution.
Unfortunately the solution is quite wrong: there is a large difference between the computed pressure drop and what is actually measured on the test bench. The numerically computed head loss is about 0.12 bar with comsol, the actual pressure drop is about 0.54 bar.
Has anyone experienced similar problems while using the CFD package?
Here is the model:
Attachments:
1 Reply Last Post Apr 20, 2011, 9:08 a.m. EDT
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Posted:
1 decade ago
So far no good luck.
Has anyone ever tried to get a 3D turbulent flow done?
The only reply I got from support was that I needed to redraw my geometry because it caused the mesh to be too fine on a surface and that prevented Comsol to operate properly.
A too refined mesh may cause problems in resolving the boundary layer and it may create artifacts, but how is it possible that Comsol cannot work if the mesh varies from very fine to fine?
Has anyone any idea?
Has anyone ever tried to get a 3D turbulent flow done?
The only reply I got from support was that I needed to redraw my geometry because it caused the mesh to be too fine on a surface and that prevented Comsol to operate properly.
A too refined mesh may cause problems in resolving the boundary layer and it may create artifacts, but how is it possible that Comsol cannot work if the mesh varies from very fine to fine?
Has anyone any idea?