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Search: Posts Made By: ghorrocks
Forum: CFX February 4, 2014, 18:12
Replies: 15
Views: 2,256
Posted By ghorrocks
This seems very strange. Can you get the...

This seems very strange.

Can you get the flow rates over these areas? If the flow is faster in one than the other then I cannot see how they are both conserving mass. Also integrate the velocity...
Forum: CFX February 1, 2014, 06:19
Replies: 15
Views: 2,256
Posted By ghorrocks
Your convergence on the symmetry plane one is...

Your convergence on the symmetry plane one is quite a bit looser. Can you converge it tighter?

Also, use larger psuedo-time steps than auto time step. Run maybe 20 iterations with a time step...
Forum: CFX January 31, 2014, 07:02
Replies: 15
Views: 2,256
Posted By ghorrocks
OK, fair enough. Can you post your output...

OK, fair enough.

Can you post your output file?
Forum: CFX January 31, 2014, 06:10
Replies: 15
Views: 2,256
Posted By ghorrocks
That changes things - now I am thinking of a...

That changes things - now I am thinking of a different error :)

Did you use a mass flow rate to specify the flow? When you use a symmetry you halve the inlet area so that would result in double...
Forum: CFX January 31, 2014, 05:19
Replies: 15
Views: 2,256
Posted By ghorrocks
You have not shown the one which looks different....

You have not shown the one which looks different. The no symmetry and the symmetry plane on the XZ plane look the same in your first post. It is the one with the symmetry plane in the XY plane which...
Forum: CFX January 30, 2014, 17:47
Replies: 15
Views: 2,256
Posted By ghorrocks
Have you checked the secondary flows? The...

Have you checked the secondary flows? The symmetry plane might be stopping a secondary flow.

Plot vectors in the YZ plane on your cross sections and I bet the secondary flows are different.
Forum: CFX January 30, 2014, 07:36
Replies: 15
Views: 2,256
Posted By ghorrocks
It sounds like you have covered the basic...

It sounds like you have covered the basic numerical accuracy stuff.

Can you explain what you are modelling? Especially what is happening upstream and downstream, with what boundary conditions you...
Forum: CFX January 30, 2014, 07:20
Replies: 15
Views: 2,256
Posted By ghorrocks
Before you start thinking about any physical...

Before you start thinking about any physical reason for this, first you must make sure your result is an accurate representation of the simulation you set up. Is the simulation fully converged? Is...
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