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Search: Posts Made By: ghorrocks
Forum: CFX September 11, 2012, 20:26
Replies: 14
Views: 2,856
Posted By ghorrocks
mactech - No, you determine what convergence...

mactech - No, you determine what convergence tolerance is required using a sensitivity analysis looking at output variables of interest to you.

Danial - In a transient simulation smaller time...
Forum: CFX September 11, 2012, 08:22
Replies: 14
Views: 2,856
Posted By ghorrocks
I need some context to answer that question -...

I need some context to answer that question - steady state or transient? A run which is converging nice and you wish to go faster, or a run which is having difficulties converging at all?
Forum: CFX September 10, 2012, 19:19
Replies: 14
Views: 2,856
Posted By ghorrocks
Your graph shows that at the start of the run you...

Your graph shows that at the start of the run you have loose convergence (in terms of residuals), and as the run progresses the residuals for each time step get tighter. By the end they are very...
Forum: CFX September 8, 2012, 08:28
Replies: 14
Views: 2,856
Posted By ghorrocks
"characteristic" just means something...

"characteristic" just means something representative. So for a pipe the characteristic length could be the diameter, for flow along a surface the distance along the surface, for a square in cross...
Forum: CFX June 19, 2012, 20:47
Replies: 14
Views: 2,856
Posted By ghorrocks
In that case use it as the starting point for a...

In that case use it as the starting point for a sensitivity analysis. The sensitivity analysis will find the real answer. This is the case for CFX, Fluent or any other solver actually.



This is...
Forum: CFX June 17, 2012, 20:56
Replies: 14
Views: 2,856
Posted By ghorrocks
Patience is a virtue. Questions from your...

Patience is a virtue.

Questions from your first post.
1. I have no idea why you say time step = 1/3 residence time. You set time step size through a sensitivity analysis.
2. I do not recommend...
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