# L-shaped duct

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January 6, 2010, 09:34
L-shaped duct
#1
Senior Member

Sebastian Gatzka
Join Date: Mar 2009
Location: Frankfurt, Germany
Posts: 729
Rep Power: 13
Hello world.

I'm trying to simulate the flow in an L-shaped duct.
See the picture attached.

I'm using velocity-inlet and outflow as boundary conditions.
The rest are walls.

Unfortunately the case does not converge.
Residuals are stuck at some level.

On what does the convergence of such a case depend?
Any ideas?
Attached Images
 lduct.jpg (71.9 KB, 10 views)
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 January 6, 2010, 10:42 #2 Senior Member     Svetlin Filipov Join Date: Mar 2009 Location: United Kingdom Posts: 176 Rep Power: 10 First of all try to remesh the domain...as I see it is a bit of luck that you got constant residuals..... and.... I do not know the dimensions of the pipe, but..... outflow BC assumes fully developed flow... (for good results)

January 6, 2010, 11:55
#3
Senior Member

Sebastian Gatzka
Join Date: Mar 2009
Location: Frankfurt, Germany
Posts: 729
Rep Power: 13
Quote:
 Originally Posted by Philipov First of all try to remesh the domain...as I see it is a bit of luck that you got constant residuals..... and.... I do not know the dimensions of the pipe, but..... outflow BC assumes fully developed flow... (for good results)
Remesh? I guess I should create a finer mesh?
Dimensions are 1m x 1m cross-section, with 10 meters overall-length.
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Schrödingers wife: "What did you do to the cat? It's half dead!"

 January 6, 2010, 13:46 #4 Senior Member     Svetlin Filipov Join Date: Mar 2009 Location: United Kingdom Posts: 176 Rep Power: 10 yes, refine the mesh, take into account the inlet BC (velocity, Re, adequately calculate the equivalent diameter, fluid type and so on)...

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