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[ICEM] Hexa Prism layer NOT USING hexa (Blocking tab) |
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July 3, 2011, 20:29 |
Hexa Prism layer NOT USING hexa (Blocking tab)
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#1 |
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Hi Everyone,
could someone tell me how to create hexa prism layers (rextangular bricks) or quad elements extruded to a hexahedral elements (distorted bricks)? Ive always used blocking method before but now I must use volume/surface/prism meshing methods on a 3d geometry... I have another question: how to create such a mesh on a 3d wing (again not using blocking) as depicted there (http://www.cfd-online.com/Forums/ans...tml#post258691) on the 4th pic? How can you tell the prims mesher to just stop at a point without stair stepping? For me either you tell Icem prism generator to do stair stepping and you give up the boundary layer resolution (middle picture) there or you uncheck stair stepping getting crap like that on the left and right pictures. Any help would be greatly appreciated! Last edited by la7low; July 3, 2011 at 21:38. |
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July 5, 2011, 10:30 |
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#2 |
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Simon Pereira
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The problem is that if you don't stair step, but transition directly to tetras, you have very thin pyramids right up against the tetras and the tetra quality is very poor. If you want to do that, you can force a remesh by selecting those pyramids (and a few tetras attached) and remeshing them with tetras (Edit Mesh => Remesh => Subset).
I recommend a 4th option... Try the trailing edge baffle (as you did on your 3rd image), but with stair stepping... This will taper off the prism layer along the baffle. To take it one step further, you could actually transition the initial height along the baffle. To do this, make sure you don't set an initial height on the baffle its self, but rather set the height on the curves. On the wing trailing edge side, set the small initial height that you set on the wing. On the other end of the baffle, set a larger height that will allow for easier transition to the volume...
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July 5, 2011, 13:18 |
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#3 | ||
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Quote:
So I rather liked your first suggestion to remove the prisms and then remesh it: Quote:
Then I went Edit Mesh => Repair Mesh => Remesh Elements. There I opted for the followings: Mesh type: Tetra Elements: the subset I created (without tetras nearby) Part: Inherited Surface Projection/ Ignore Projection was left unckeched Unfortunately, the pyramids were barely replaced by tetras (look at 3rd picture)...What should I do different? Thanks for the help! |
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July 8, 2011, 02:43 |
Success but further questions..
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#4 |
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I could make it, see picture below. I even scripted it and have a question about the "ic_uns_subset_add_pick_polygon" command. Its arguments are: "what name poly vect from_names partial convex etype [""]".
What is "vect"? I could not figure it out and Programmer's Guide only says: "Add elements in a screen polygon area to the subset, what can be one of edge, node, element, or a list of one or more of 0d, 1d, 2d, 3d." In addition, I still welcome suggestions on how to extrude Autoblock surface mesh to layers containing hexa (topic title)? For me the prism layers always die prematurely when starting off with all quad surfaces... Thanks for the help so far! |
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July 11, 2011, 16:49 |
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#5 |
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Simon Pereira
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Vect is probably the screen view vector...
The polygon select assumes that you are viewing the polygon from a particular orientation (normal to the screen), and so needs a direction vector...
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----------------------------------------- Please help guide development at ANSYS by filling in these surveys Public ANSYS ICEM CFD Users Survey This second one is more general (Gambit, TGrid and ANSYS Meshing users welcome)... CFD Online Users Survey |
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January 29, 2012, 00:50 |
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#6 | |
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Ming Cai
Join Date: Mar 2011
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Quote:
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