# BOUNDARY LAYER MESH

 Register Blogs Members List Search Today's Posts Mark Forums Read

 December 5, 2008, 03:47 BOUNDARY LAYER MESH #1 Kostas Pan Guest   Posts: n/a Sponsored Links I have made a surface in gambit and i want to make a "boundary layer" near at one edge. I make the boundary layer with a tool "create boundary layer". But the remainder surface of this surface how i fill it with mesh??

 December 5, 2008, 04:12 Re: BOUNDARY LAYER MESH #2 zongtwi Guest   Posts: n/a Just mesh it like you normally would, using create surface mesh. Hope that helps.

 December 5, 2008, 06:22 Re: BOUNDARY LAYER MESH #3 Kostas Pan Guest   Posts: n/a Yes, i do this but it make a mesh over the boundary mesh... Thus, appear two mesh (the boundary mesh and the mesh from cretion surface mesh)one over other...

 December 5, 2008, 07:45 Re: BOUNDARY LAYER MESH #4 zongtwi Guest   Posts: n/a Then you must have done something wrong...the mesh should not overlap. In the GAMBIT documentation, there are a number of tutorials that teaches you how to do that. Try that out. Hope that helps.

 December 6, 2008, 03:43 Re: BOUNDARY LAYER MESH #5 Kostas Pan Guest   Posts: n/a Thanks...ok

 December 6, 2008, 17:20 Re: BOUNDARY LAYER MESH #6 kostas Guest   Posts: n/a I do the boundary layer and after i try to fill all surface with mesh. For mesh of remender surface i use Sheme: map , Quad. Now the mesh stick up the boundary mesh but at some points the mesh it wrong as well as look the above picture which i sent. http://www.users.otenet.gr/~meenseto/p1j.jpg http://www.users.otenet.gr/~meenseto/p2j.jpg what i do??? thanks...

 December 8, 2008, 06:52 Re: BOUNDARY LAYER MESH #7 mahi Guest   Posts: n/a Is it a planar surface? Looks like you have meshed the other edges first. Remove the edge meshes in all the other edges, put the boundary layer at the required edge, then mesh the remaining edges. Now it should be meshable fine.

 December 8, 2008, 13:06 Re: BOUNDARY LAYER MESH #8 kostas Guest   Posts: n/a Yes, first i make the boundary layer and after i put the nodes at other edges. What you mean with planar surface?

 December 9, 2008, 00:33 Re: BOUNDARY LAYER MESH #9 mahi Guest   Posts: n/a OK in that case you might have given a coarse mesh on the other edges. Please do one thing, use the ratio option on the other edges and check if it make any difference. Or else you can split the other edges and have a transition from fine to coarse mesh

 December 9, 2008, 08:16 Re: BOUNDARY LAYER MESH #10 kostas Guest   Posts: n/a Can you tell me the all steps? I do these but i dont understant. How operete the boundary layer? First you must make the boundary layer and after a procedure for other nodes? When i make the boundary layer and make the other nodes at other-near edge and after split the nodes at two mesh, the boundary layer dissapear.

 December 9, 2008, 09:09 Re: BOUNDARY LAYER MESH #11 mahi Guest   Posts: n/a Hi, can you put a picture of the surface alone here? I want to see it without the boundary layer.

 December 9, 2008, 13:56 Re: BOUNDARY LAYER MESH #12 kostas Guest   Posts: n/a Is the right surface which has not mesh. http://www.users.otenet.gr/~meenseto/g1.jpg The boundary layer must be maked at a edge of airfoil.

 December 9, 2008, 23:36 Re: BOUNDARY LAYER MESH #13 mahi Guest   Posts: n/a kostas, if the whole domain is a part of a circle, you can do one thing, delete the faces to teh left of the domain, and reflect the faces to the right about the centre axis. You didn't even have to make the 4 quarters. You could then just make one quarter, reflect it about any axis, and then reflect the resultant 2 faces in the same way. Then you need to connect edgesusing the edge connect option. Or else, you can link the face meshes and proceed with the meshing.

 December 9, 2008, 23:52 Re: BOUNDARY LAYER MESH #14 mahi Guest   Posts: n/a Ignore my earlier mail. The thing is that in your case, the boundary layer will get deformed at the ends as there is already a mesh on the right side. The thing is that you first put an edge mesh on the aerofoil surface. Then go for a boundary layer. On the outer surface(circle), have the same number of intervals as you have on the aerofoil surface. It would be better if you connect join the edges that form the aerofoil (looks like you have the aerofoil surface made of many edges). If you are going for a quad mesh, the the no of intervals on the right unmeshed edge and the horizontal edge should be the same. For the small facenear the centre, same applies. Mesh the small face first. Then proceed further.

 December 10, 2008, 13:54 Re: BOUNDARY LAYER MESH #15 kostas Guest   Posts: n/a Why can not make mesh up the boundary layer??? Why the up place of boundary layer hasnt nodes??? Is there a produse for make mesh up the boundary layer without compute the appearenceof boundary layer... mahi, i do this which you tell me but the same state...

 December 11, 2008, 05:05 Re: BOUNDARY LAYER MESH #16 sushil Guest   Posts: n/a Hi Kostas, I think, it would be better if you check your geometry first. with the first figure you posted I suspect that these are two different faces you are trying to mesh. Please check that the faces you are trying to mesh are connected properly and there is no extra face. Regards, Sushil

 December 11, 2008, 08:51 Re: BOUNDARY LAYER MESH #17 kostas Guest   Posts: n/a With "The boundary layer tool", you have the capability to make a real mesh or make a help control mesh (not real but as driver of real mesh)????

 December 12, 2008, 00:16 Re: BOUNDARY LAYER MESH #18 sushil Guest   Posts: n/a Boundary layer is not meant to creat mesh. It just helps you to distribute your cell sizes when you mesh the domain or face.

 December 12, 2008, 05:53 Re: BOUNDARY LAYER MESH #19 kostas Guest   Posts: n/a ok... I find the problem....!!!! I put the 2.3.16 edition of gambit... and i do the same procedure. The mesh was fine.... May , there is problem at gambit 2.2.3 .. I dont know...

 Thread Tools Display Modes Linear Mode

 Posting Rules You may not post new threads You may not post replies You may not post attachments You may not edit your posts BB code is On Smilies are On [IMG] code is On HTML code is OffTrackbacks are On Pingbacks are On Refbacks are On Forum Rules

 Similar Threads Thread Thread Starter Forum Replies Last Post fra76 OpenFOAM Meshing Format & General Technical 0 May 21, 2006 03:32 ryan FLUENT 2 November 17, 2005 15:21 frank FLUENT 2 July 26, 2005 13:55 Question Man. FLUENT 1 August 14, 2001 15:05 merac FLUENT 1 June 19, 2001 11:45