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-   -   Negative cell volume detected, dynamic mesh (http://www.cfd-online.com/Forums/fluent/96874-negative-cell-volume-detected-dynamic-mesh.html)

tony25800 February 3, 2012 11:08

Negative cell volume detected, dynamic mesh
 
Hi,

I am doing dynamic mesh using FLUENT, but always encounter the problem of 'Negative cell volume detected'. So what is simpliest way to solve this?

Because my case is very simple. :)A rectangle car is moving in a tunnel with speed of 1m/s. (I have to use dynamic mesh). I am try all the three method 'layering, remeshing and smoothing', but none of them work. Mesh simply deformed and did not merge or split so that Negative cell volume occurred. May I ask what method is the simplist one and what parameter should I use?

I have also tried to shorten to step time, but still of no use.


Thanks a lot!

delaneyluke February 10, 2012 02:49

Under the dynamic mesh tab, use the preview mesh motion to and figure out where exactly your mesh is failing during motion.
And for your case, I would suggest keep the car stationary and move a flow of 1 m/s over it --> no dynamic mesh (if what you are analysing is the external flow over the car)
Else, Layering can be used only for a hex/quad mesh AND Remeshing can only be done on a tri/tet mesh.
Need more details on what you're analysing to help you better.

Regards
Luke

abdulrauf.abdulrazak May 13, 2012 09:15

negative cell volume detected
 
1 Attachment(s)
http://www.cfd-online.com/Forums/att...1&d=1336914803


Hi..i am having the same problem regarding on negative cell volume.. my case was like in the picture..please help me...

KITetima October 22, 2013 10:03

Hey,

Have you find any solution to your problem?

PNSK March 7, 2014 06:32

Negative cell volume exists
 
1 Attachment(s)
Hey abdulrauf.abdulrazak i to had same problem did u solve it

PNSK March 7, 2014 06:34

Negative cell volume exists
 
1 Attachment(s)
Hey abdulrauf.abdulrazak i to had same problem did u solve it

if so can you help me?

Thanks
Naga Suresh Kumar

razi.me05 September 17, 2014 19:50

Hi did anyone of you guys find a solution to this problem?


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