Dynamic Mesh - negative cell volume

orie · January 9, 2011, 05:21

Hello All and thanks for reading,

I am trying to build a model for a peristaltic pump in 2 dimensions.

I used the "DEFINE_GRID_NOTION" to program a motion of progressive wave, to the walls.

When I am trying to run the calculation FLUENT tells me it couldn't proceed because of "negative cell volume detected".

If anyone know what sould I do, I will be glad

Thnks

Ori

tschump · January 22, 2011, 06:05

Lower your time step. If you are doing layering, time step must be adapted so that only one layer of cell will be destroyed in one time step. Doing otherwise will result in negative volume cells.

January 9, 2011, 05:21	Dynamic Mesh - negative cell volume	#1
orie New Member Join Date: Jan 2011 Posts: 2 Rep Power: 0	Hello All and thanks for reading, I am trying to build a model for a peristaltic pump in 2 dimensions. I used the "DEFINE_GRID_NOTION" to program a motion of progressive wave, to the walls. When I am trying to run the calculation FLUENT tells me it couldn't proceed because of "negative cell volume detected". If anyone know what sould I do, I will be glad Thnks Ori

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January 22, 2011, 06:05		#2
tschump New Member Denis Tschumperle Join Date: Mar 2009 Posts: 5 Rep Power: 17	Lower your time step. If you are doing layering, time step must be adapted so that only one layer of cell will be destroyed in one time step. Doing otherwise will result in negative volume cells.