# Volumetric Control Problems

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 March 9, 2017, 13:25 Volumetric Control Problems #1 New Member   grossz Join Date: Jul 2016 Posts: 3 Rep Power: 3 Hi!I have a problem when generating polyhedral meshes with Volumetric Control mine.png Attach 1(with color) is what I generated paper.jpg Attach 2 is a image of a paper. It's obvious that meshes in attach 2 used Volumetric Control but has difference with mine and with the User's Guide. I wonder how to generate meshes like it?

 March 9, 2017, 13:46 #2 Senior Member   Join Date: Nov 2010 Location: USA Posts: 947 Rep Power: 15 You need to decrease the volume blending factor. Start at 0.3 or so.

 March 10, 2017, 10:44 #3 New Member   grossz Join Date: Jul 2016 Posts: 3 Rep Power: 3 mine2.png Hi,me3840! Thanks a lot! I've regenerated mesh. But the refinement of Volumetric Control is still different from the image in that paper. In the paper's case ,I think, the author set the maximum size in Volumetric Control and use some method to let cells grow irregularly as same as in the core region. But cells in my case is in regular following the shape of rectangle.

 March 10, 2017, 10:53 #4 Senior Member   Join Date: Nov 2010 Location: USA Posts: 947 Rep Power: 15 Yes, you have to play with it. If you lower the value you will get something like that in the paper. Sometimes though, depending on the sizes involved, you can't lower the blending factor enough to get rid of the volume control template. There's no hard or fast rule on what the value should be, you just progressively lower and remesh until you get (hopefully) what you want. Though the paper has a very smooth outline, are you sure that refinement is in a volume and not on a symmetry plane or wall? That's what it looks like to me.

 March 10, 2017, 11:36 #5 New Member   grossz Join Date: Jul 2016 Posts: 3 Rep Power: 3 Well, you're right.I just emailed the author. It's a symmetry face ~ XD. Thank you very much!

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