CFD Online Discussion Forums

CFD Online Discussion Forums (http://www.cfd-online.com/Forums/)
-   STAR-CD (http://www.cfd-online.com/Forums/star-cd/)
-   -   star cd convergence error (http://www.cfd-online.com/Forums/star-cd/92424-star-cd-convergence-error.html)

gagi September 14, 2011 03:53

star cd convergence error
 
hi im a chemical engineering post graduate student and i have to model and simulate a tray dryer using STAR CD and im somewhat new to CFD. i started my model as a .IGES file and created the surface mesh in pro-surf as a .dbs file n then as a .mdl file in pro amm. when i run the model there are convergence errors and when i check the residuals and browse the standard output file, after 2 iterations there is an error message saying,
"FLUID FLOW DETECTED AT SOME OUTFLOW BOUNDARIES MASS FLUX IS FORCED TO ZERO. IF THIS CONDITION PERSISTS, YOUR CALCULATIONS MAY BE WRONG "

the mesh didn't get converged after 100000 iterations. my mesh got around 1 500 000 fluid (air) trimmed cells, with 5ms-1 air speed at the inlet and flow is steady state and laminar. used SIMPLE method to solve it. and in the star guide panel, i make all the input parameters like i did in the STAR tutorial 2nd example, (flow in a partially blocked elbow).

im new to CFD and STAR CD and spend considerable time to figure out whats wrong with my model .. can you please give me some advice?


All times are GMT -4. The time now is 16:11.