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-   -   Cyclone separator RSM mesh problem (http://www.cfd-online.com/Forums/fluent/44449-cyclone-separator-rsm-mesh-problem.html)

kharnab April 16, 2007 09:02

Cyclone separator RSM mesh problem
 
Hello, i want to know if it is necessary to precise an operating pressure or a guage pressue to simulate the motion in a cyclone separator with a high mach number (supposition of incompressibility) My other question is that the simulation converge with a low number of cells (10000-35000) by the RSM model, when the mesh is rafined the solution diverge, ho can tell me what's the problem? thanks


Daniele Nanni April 16, 2007 09:24

Re: Cyclone separator RSM mesh problem
 
For the second question: fine grid can result in numerical instability due to a natural oscillation of the flow (residuals persistently occillating). The problem in known in literature (CSIRO 1997 - Turbulence modelling of single phase flow in a spray dryer).



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