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Forum: ANSYS July 16, 2014, 10:43
Replies: 50
Views: 18,538
Posted By stumpy
To avoid over-damping it is best to start with...

To avoid over-damping it is best to start with the unstable solution and increase the coefficient until you approach the converged solution. The unstable solution will have oscillations that grow in...
Forum: ANSYS July 14, 2014, 09:57
Replies: 50
Views: 18,538
Posted By stumpy
1) The number of Coupling Iterations can vary...

1) The number of Coupling Iterations can vary from case to case, but it should be possible to converge just about any case in 10 or less Coupling Iteration. The key point is not to use too much...
Forum: ANSYS July 10, 2014, 08:53
Replies: 50
Views: 18,538
Posted By stumpy
Can you assume the min pressure of 10964.52 Pa is...

Can you assume the min pressure of 10964.52 Pa is consistent with the MRI scan geometry? Then you could adjust your pressure levels so that you always pass a positive pressure.
For force I find it...
Forum: ANSYS July 9, 2014, 10:52
Replies: 50
Views: 18,538
Posted By stumpy
I'm not sure why the continuity residuals would...

I'm not sure why the continuity residuals would be high. If other residuals are low then it could just be the way the residuals are normalized. The default residual normalization in Fluent is not...
Forum: ANSYS July 8, 2014, 09:29
Replies: 50
Views: 18,538
Posted By stumpy
To check if Fluent is initialized correct you can...

To check if Fluent is initialized correct you can scroll up the Fluent transcript file and look for some output that says Fluent is reading the dat file. If you don't see this, then something went...
Forum: ANSYS July 7, 2014, 09:59
Replies: 50
Views: 18,538
Posted By stumpy
So yes, since the geometry is based on the MRI...

So yes, since the geometry is based on the MRI scan then it represents a pre-stressed geometry. Let ignore linear/non-linear material properties for now. The forces you send to System Coupling...
Forum: ANSYS July 4, 2014, 14:34
Replies: 50
Views: 18,538
Posted By stumpy
From the looks of the geometry this is an artery...

From the looks of the geometry this is an artery simulation. A few things to keep in mind...

What does the geometry/mesh represent? Is it probably the pre-stressed structure due to blood...
Forum: ANSYS July 4, 2014, 08:57
Replies: 50
Views: 18,538
Posted By stumpy
You cannot select pseudo-transient when Fluent is...

You cannot select pseudo-transient when Fluent is in transient mode. The idea is to get the transient solver to behave as close as possible to the pseudo-transient approach.

1 iteration per time...
Forum: ANSYS July 3, 2014, 13:17
Replies: 50
Views: 18,538
Posted By stumpy
Yes, it means to use a large time step. ...

Yes, it means to use a large time step. Typically you might choose some fraction (perhaps 20%) of the residence time of the fluid in the domain, but this can be very much case dependent. Larger...
Forum: ANSYS July 3, 2014, 10:47
Replies: 50
Views: 18,538
Posted By stumpy
Regarding initializing a transient FSI with...

Regarding initializing a transient FSI with steady-state FSI results....

As you found you cannot mix Transient Structural with steady-state Fluent (this is the approach used with CFX FSI). Also,...
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