FSI 2D - dynamic mesh

destroy · June 6, 2018, 10:08

Hi,

I am preparing 2D FSI analysis in ANSYS Fluent and Mechanical. For this purpose, I created extruded (sweep) mesh for the one layer.
I am using smoothing and 2.5D remeshing.

Unfortunately, I had the NCV (Negative Cell Volume) problem.
My case is some flap in the water stream.

In the below picture, I showed the cell volume contour and mesh; it shows only negative cell volumes.

Please give me some advices, what could be wrong. I tested many time step sizes, the min and max cell size in dyn mesh settings is OK.

Regards
Destroy

destroy · June 6, 2018, 17:10

It seems to me like the information about the flap deformation is not transferred from Mechanical to Fluent.
The mesh before calculation:

and after calculation, with negative cell volumes:

It's strange - I set appropriate data transfers and dynamic mesh zones.

But I'm not sure if I should search the mistake here - maybe it's only dynamic mesh issue?

June 6, 2018, 10:08	FSI 2D - dynamic mesh	#1
destroy Member Marcin Join Date: Jun 2016 Posts: 96 Rep Power: 9	Hi, I am preparing 2D FSI analysis in ANSYS Fluent and Mechanical. For this purpose, I created extruded (sweep) mesh for the one layer. I am using smoothing and 2.5D remeshing. Unfortunately, I had the NCV (Negative Cell Volume) problem. My case is some flap in the water stream. In the below picture, I showed the cell volume contour and mesh; it shows only negative cell volumes. Please give me some advices, what could be wrong. I tested many time step sizes, the min and max cell size in dyn mesh settings is OK. Regards Destroy

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June 6, 2018, 17:10		#2
destroy Member Marcin Join Date: Jun 2016 Posts: 96 Rep Power: 9	It seems to me like the information about the flap deformation is not transferred from Mechanical to Fluent. The mesh before calculation: and after calculation, with negative cell volumes: It's strange - I set appropriate data transfers and dynamic mesh zones. But I'm not sure if I should search the mistake here - maybe it's only dynamic mesh issue?