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-   -   Flow is not converging in natural convection problem of boussinesq model for air (https://www.cfd-online.com/Forums/fluent/72075-flow-not-converging-natural-convection-problem-boussinesq-model-air.html)

rahulsharma January 25, 2010 02:16

Flow is not converging in natural convection problem of boussinesq model for air
 
hey guys
this is rahul working on cfd analysis of natural convection cross ventilation of a room inside a computational domain. the heat source is provided on a wall.
1. is it fine to define a heat source at wall in boundary condition panel as heat source W/m2
2. Solution is not converging than what should be the problem.
can anyone help me.
thanks,.

rlahlou December 15, 2015 10:19

Hey rahulsharma,

did you finally solve your issue?
I am facing convergence issue as well using Fluent for a free convection problem in a side-heated vertical channel. When I use Boussinesq assumption with pressure inlet and pressure outlet BC, I get the AMG solver divergence ( Although I reduced the under-relaxation factors, checked the mesh quality and a bunch of other changes recommended on forums for AMG solver divergence ...).
Using the ideal gas law for density instead of Boussinesq, I obtain a solution but it is unphysical.

Thanks a lot for your (or anyone else's) feedback!


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