Negative Volume Cells in 2-D Airfoil

najiee · June 2, 2021, 01:53

I designed an airfoil in Design Modeller by importing coordinates from a .txt file. I was assigned to generate C-topology mesh in Pointwise. I imported my model in Pointwise, created the mesh but when I import it back into FLUENT, I always get the error for Negative Cell Volume.
I have attached an image that shows the inner area of my foil and I think that the problem is right here. The mesh shouldn't be inside the foil. Can someone point me in the right direction?
Thanks in advance.

pdp.aero · June 2, 2021, 12:24

Quote:

Originally Posted by najiee

I designed an airfoil in Design Modeller by importing coordinates from a .txt file. I was assigned to generate C-topology mesh in Pointwise. I imported my model in Pointwise, created the mesh but when I import it back into FLUENT, I always get the error for Negative Cell Volume.
I have attached an image that shows the inner area of my foil and I think that the problem is right here. The mesh shouldn't be inside the foil. Can someone point me in the right direction?
Thanks in advance.

I strongly suggest you to Google Pointwise tutorial on 2d airfoil mesh.

dgarlisch · June 3, 2021, 18:26

There should not be any mesh "inside" the airfoil. It looks like the domains are folded over on each other. If it is small, ZIP the pw file and attach it here.

Shamoon Jamshed · February 28, 2025, 00:14

your mesh lies inside airfoil which is wrong!

schristopher · April 14, 2025, 12:14

This was my problem. I didn't subtract the solid from the fluid.

It is best to post the solution to a question like this so that others can learn from it.

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June 3, 2021, 18:26		#3
dgarlisch Senior Member David Garlisch Join Date: Jan 2013 Location: Fidelity Pointwise, Cadence Design Systems (Fort Worth, Texas Office) Posts: 307 Rep Power: 15	There should not be any mesh "inside" the airfoil. It looks like the domains are folded over on each other. If it is small, ZIP the pw file and attach it here.

February 28, 2025, 00:14		#4
Shamoon Jamshed Senior Member Shamoon Jamshed Join Date: Apr 2009 Location: Islamabad Posts: 405 Rep Power: 20	your mesh lies inside airfoil which is wrong!

April 14, 2025, 12:14		#5
schristopher New Member Steven Christopher Join Date: Apr 2025 Posts: 1 Rep Power: 0	This was my problem. I didn't subtract the solid from the fluid. It is best to post the solution to a question like this so that others can learn from it.