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-   -   Non-rigid node displacement using Dynamic mesh (http://www.cfd-online.com/Forums/fluent/68670-non-rigid-node-displacement-using-dynamic-mesh.html)

mrestrepo30 September 28, 2009 13:50

Non-rigid node displacement using Dynamic mesh
 
Hi all,

I'm using the dynamic mesh capability to displace a wall in a model using GRID_MOTION, however I keep getting negative volumes.
I'm displacing each node separately, and I'm using remeshing and smoothing on a unstructured mesh. I've tried different parameters for dynamic zones and parameters, and also different time steps; however I keep getting negative volumes.
What I wanted to know is if anyone knows if there's a way to limit the node displacement so I don't get skewness over 0.95, or if there's a way to do non-rigid displacement using a different macros (maybe displacing each cell as a whole)

Thanks!

herntan September 30, 2009 21:27

u have set the neighbour cell size?

I think that is the parameter to let Fluent know about what size u need to remesh or layering.

mrestrepo30 September 30, 2009 22:22

yes I did. When I defined my wall as a dynamic zone (user defined) I entered the neighbor cell size (which is the fluid)

herntan September 30, 2009 22:37

maybe u should post up the picture of ur model and mesh.
Its hard to understand what u trying to do.


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