Non Convergence of 3D Heat transfer cfd problem

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 December 8, 2004, 12:04 Non Convergence of 3D Heat transfer cfd problem #1 Balraj Guest   Posts: n/a I am trying to perform cfd analysis on 3D rectangular cavity problem with a hot and cold opposite sides with a temp difference of 10 deg and the other 2 sides being adiabatic. I did a couple of runs with the following parameters: 1) Aspect ratio - 25:1 (H/L), Secondary Aspect ratio - 1:2 (W/L), Ra = 92,625, vertical (90deg) and horizontal orientation(0deg) of the cavity. I was able to achieve convergence in both the cases 2) I changed the secondary aspect ratio to 5:1 and did the run again. This time around i could not achieve convergence for 0deg orientation. I am using fluent to perform the analysis. I cannot describe the entire simulation parameters here. But if someone could let me know, by their experience, the parameters I can target to achieve convergence. I am trying to get constant flux on the heat and cold sides for over atleast 100 iterations. I would appreciate your help in this regard.

 December 9, 2004, 00:03 Re: Non Convergence of 3D Heat transfer cfd proble #2 Joe Brian Guest   Posts: n/a Sounds you are facing quite a classical problem. You may want to look for papers already published. I am not sure what the number is. Ra or Gr??? You will be able to find the result with the same non-dimensionalized number from the papers. Or from my past experience, the flow may not be steady but transient or there my be some bifurcations. Good luck!! -Joe

 December 9, 2004, 00:19 Re: Non Convergence of 3D Heat transfer cfd proble #3 Joe Brian Guest   Posts: n/a Forgot to mention. CFX was one of the three got into consideration. -Joe

 December 9, 2004, 00:24 Re: Non Convergence of 3D Heat transfer cfd proble #4 Joe Brian Guest   Posts: n/a Sorry! This shouldn't be here. Should be under Re: FLUENT/CFX/STARCD as CFD modelers - I've been too busy posting messages. -Joe

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