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-   -   Dynamic mesh "connectivity Error"?? (http://www.cfd-online.com/Forums/fluent/93880-dynamic-mesh-connectivity-error.html)

Catthan October 29, 2011 07:22

Dynamic mesh "connectivity Error"??
 
Dear all,

I'm trying to model a 3D case of 2 Wankel rotors connected by pipes sideways.

I have my dynamic mesh UDFs right and working, non-critical skewness (0.60 in the begining up to .85 max during simulation) and a conservative time step.

At about half of the cycle or towards the end of it my model crashes with a message saying smth like
"cavity along longest edge-mesh connectivity error"

the case I am running at the moment is just air, laminar flow, energy equation off.
I am using a tetrahedral mesh from ICEM (passed all checks) with smoothing and remeshing (local cell & face).

I don't remember seeing such error during dynamic mesh preview..
Maybe some skewness warnings which I dealt with by improving the mesh and dropping the time-step.

I've only seen one unanswered similar post from 2005 so I am guessing I am missing smth very obvious.

I would really appreciate any help.

All the best,

mvee October 31, 2011 02:33

connectivity error
 
Hi Catthan

Can you put some images of your mesh on starting of simulation and before your simulations crashes?

rgds
mvee

Catthan October 31, 2011 05:32

Hi mvee, thanks.

I lowered the time step a bit and slightly improved the mesh and it worked.
However it would be good if I got it to run a bit faster.

I haven't saved any pics but I'll try to recreate the problem and post them when I do although I don't believe they would be conclusive.


Anything particular you are thinking of - expecting to see?

All the best,


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