Non-rigid node displacement using Dynamic mesh

mrestrepo30 · September 28, 2009, 14:50

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, 22:27

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, 23:22

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, 23:37

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

September 28, 2009, 14:50	Non-rigid node displacement using Dynamic mesh	#1
mrestrepo30 Member Join Date: Jun 2009 Posts: 31 Rep Power: 17	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!

September 30, 2009, 22:27		#2
herntan Senior Member YH Tan Join Date: Mar 2009 Location: Malaysia Posts: 119 Rep Power: 17	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. __________________ Herntan, Add Reputation if I am right

September 30, 2009, 23:37		#4
herntan Senior Member YH Tan Join Date: Mar 2009 Location: Malaysia Posts: 119 Rep Power: 17	maybe u should post up the picture of ur model and mesh. Its hard to understand what u trying to do. __________________ Herntan, Add Reputation if I am right

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September 30, 2009, 23:22		#3
mrestrepo30 Member Join Date: Jun 2009 Posts: 31 Rep Power: 17	yes I did. When I defined my wall as a dynamic zone (user defined) I entered the neighbor cell size (which is the fluid)