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-   -   Unstructured grid problem - Laminar flow pipe (http://www.cfd-online.com/Forums/fluent/39213-unstructured-grid-problem-laminar-flow-pipe.html)

Roby January 12, 2006 06:54

Unstructured grid problem - Laminar flow pipe
 
In order to perform complex pipe geometry with laminar flow simulations, i've tried to mesh a simple straight duct with a t-grid scheme using the size function in gambit to preserve the boundary layer detection. I set an udf to have a laminar fully developed flow profile at the inlet. I set a size function in gambit to obtain a value of about R/38 for the first cell height as suggested by the fluent manual. I set outflow for the outlet bc. The results i obteined are unespected... e.g. the max velocity plotted on an axial line decreased of about 20% respect to the max inlet value! I've checked the mass balance and it seems to be all right. With structured mesh i obtained good results. Have you got any ideas for non structured grids?!?! I thought it could be a not correct prediction of the boundary layer flow or even some solver parameter i missed...

thanks in advance.


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