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Moti May 31, 2012 20:45

Meshing issue in sharp edges
 
Hi every one;

I have hard time in getting the good mesh quality in sharp edges of my model using the STAR-CCM+. I am putting the feature curves in all the edges and used cutsome value size for feature curves with no success in improvingthe the surface mesh quality and I am still getting poor surface mesh. Any idea on how to improve the quality of surface mesh?
Your feedbacks are greatly appreciated

Thanks;

rwryne May 31, 2012 22:39

Quote:

Originally Posted by Moti (Post 364194)
Hi every one;

I have hard time in getting the good mesh quality in sharp edges of my model using the STAR-CCM+. I am putting the feature curves in all the edges and used cutsome value size for feature curves with no success in improvingthe the surface mesh quality and I am still getting poor surface mesh. Any idea on how to improve the quality of surface mesh?
Your feedbacks are greatly appreciated

Thanks;

Screenshots will help. "Poor surface mesh" can mean lots of things!

Moti May 31, 2012 22:54

I mean faces who are creating a corner or a sharp edge will collapsing to each other randomly along that edge or corner and in the created surface mesh there would be no corner or sharp edge.

rwryne June 1, 2012 08:32

Quote:

Originally Posted by Moti (Post 364202)
I mean faces who are creating a corner or a sharp edge will collapsing to each other randomly along that edge or corner and in the created surface mesh there would be no corner or sharp edge.

Try using a custom surface size along the edge where the collapse is occuring.

Moti June 1, 2012 11:50

3 Attachment(s)
Hi Ryne
I have already defined feature curve in the edges and used custom surface size for the feature curves in the regions with no effect on the surface mesh results. Is ther any other place that I can define custome size mesh for the edges?

Thanks

rwryne June 1, 2012 12:23

Quote:

Originally Posted by Moti (Post 364318)
Hi Ryne
I have already defined feature curve in the edges and used custom surface size for the feature curves in the regions with no effect on the surface mesh results. Is ther any other place that I can define custome size mesh for the edges?

Thanks


Under your Surface Remesher (Continua->Mesh 1>Models->Surface Remesher), try disabling "Retain Geometric Features" and remeshing. Despite what it name says, this feature often makes my meshes not follow geometry, specifically around edges

Not sure if it will help here, but might also try upping your Surface Curvature->Basic Curvature value. I typically change this to 72 for every simulation.

Lastly, and this probably wont help, but try lowering your Surface Growth Rate. I usually change the default of 1.3 to 1.2

rwryne June 1, 2012 12:27

After looking at the pictures again, it really doesn't seem like you have a feature curve applied....

The best way to check is to do surface repair on the initial surface and make sure the edge shows up as a dark black line. (Representations -> Right click on Initial surface and hit Repair)

Moti June 1, 2012 12:40

Thanks Ryne for your suggestions. I will try them to see how they work. And about the features curves, I have checked them inm the repair surface and all these edges are shown as dark black line.

Thanks again

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