CFD Online Discussion Forums

CFD Online Discussion Forums (
-   CFX (
-   -   Convergence (

Mohaba July 22, 2002 08:23

hey guys

I am modeling a ventilated space. when I increase the number of cells the mass residual decreases only in an order of one. Is it possible to reduce it further? For a course grid I get a reduction of order 12, when I triple the grid size there is a problem.



James Date July 23, 2002 13:25

Re: Convergence
Just a little tip. Check that the Y+ of any cells near any solid walls is greater than 11, usually cell sizes should be such that the Y+ is in the range of 30 - 500. I have found in my research that failure to stick to the correct bounds for Y+ can result in lack of convergence and very long solution times.

Good luck


Mohaba July 29, 2002 05:32

Re: Convergence

All times are GMT -4. The time now is 05:18.