# [GAMBIT] Pave + Hard edges

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 February 10, 2011, 14:16 Pave + Hard edges #1 Member   kostas Join Date: Jun 2010 Posts: 35 Rep Power: 9 Sponsored Links I use Gambit software. If i want to have more dense mesh (in pave method at 2d-face) at a region in one domain, i must make "hard edges" at this region. Right? After Can i delete all hard edges and to remain the face and its mesh? With word "hard edges", we mean the split of face by an edge? This is Right?

 February 11, 2011, 02:18 #2 Super Moderator     Maxime Perelli Join Date: Mar 2009 Location: Switzerland Posts: 3,232 Rep Power: 34 an hard edge is an edge which splits partially a surface. That means it doesn't divide you surface into 2 separated surfaces and it can give you meshing trouble. Sans titre.png If you want to refine your surface (homogeneous), you can decrease the value of element size in the meshing panel. Or you can use split and size fonctions combination. __________________ In memory of my friend Hervé: CFD engineer & freerider

February 12, 2011, 22:47
#3
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Santiago
Join Date: Dec 2009
Posts: 85
Rep Power: 9
Regarding hard edges. I'm trying to model a a plate inside a turbulent BL using LES and Gambit. Take a look at the attahced mesh. The simulation gets screwed up at the intersection of the structured and unstructered mesh. There are artificial eddies formed and the flow gets disturbed. Is there any way to solve this type of problem? I tried using Hex elements only, but my plate in a void inside the middle volume and I'm forced to use tet elements. Any sugestions?
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 February 14, 2011, 02:00 #4 Super Moderator     Maxime Perelli Join Date: Mar 2009 Location: Switzerland Posts: 3,232 Rep Power: 34 I don't understand why you can't use hexa instead of tetra. Can you post a picture of your result at the intersection between structured and unstructured mesh. __________________ In memory of my friend Hervé: CFD engineer & freerider

February 17, 2011, 20:32
#5
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Santiago
Join Date: Dec 2009
Posts: 85
Rep Power: 9
Thanks for your reply Max and sorry for my late answer. take a look at the picture. I'm basically exporting my mesh to OpenFoam. LEt em know what you think. Thanks
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 February 18, 2011, 02:19 #6 Super Moderator     Maxime Perelli Join Date: Mar 2009 Location: Switzerland Posts: 3,232 Rep Power: 34 Regarding your picture your are working with unsteady solver, right? Did you try to run your model with steady solver? __________________ In memory of my friend Hervé: CFD engineer & freerider

 February 18, 2011, 08:00 #7 Member   Santiago Join Date: Dec 2009 Posts: 85 Rep Power: 9 yes im using an unsteady solver because this is an LES simulation. Would a steady solver work in conbination with LES?

 February 18, 2011, 08:04 #8 Super Moderator     Maxime Perelli Join Date: Mar 2009 Location: Switzerland Posts: 3,232 Rep Power: 34 Indepedantly from your physics, you may switch to steady solver and standard turbulent model, just for be sure that your problem comes from your mesh (or not). __________________ In memory of my friend Hervé: CFD engineer & freerider

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