# A tilted 3D cube inside a wind tunnel

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

 February 28, 2008, 16:34 Is it possible to simulate thi #1 Member   Alain Martin Join Date: Mar 2009 Posts: 40 Rep Power: 10 Is it possible to simulate this problem? I have looked in the forum and the closest I found was a 3d cube but with two faces parallel to the outside boudary and touching it. -Alain

 February 28, 2008, 16:41 Hi Alain, In principle, you #2 Member   Ola Widlund Join Date: Mar 2009 Location: Sweden Posts: 87 Rep Power: 10 Hi Alain, In principle, your case is different only in geometry. You need a grid-generator for making your mesh, though. It's too complicated for blockMesh. The problem may be large, however, if you want to resolve transient features and finer details of the flow. But that's another story... /Ola

 February 28, 2008, 17:23 Thanks Ola, I have no problem #3 Member   Alain Martin Join Date: Mar 2009 Posts: 40 Rep Power: 10 Thanks Ola, I have no problem generating the mesh with Gmsh. I have to define the outside box with boundary condition like inlet and outlet and wall. For the inside cube which boundary condition can I define? With gmshToFoam, I get no patches available for anything inside that big box. I have the following messages : . .Finding faces of patch 10 --> FOAM Warning : Not using gmsh face 3(11 188 13) since zero vertex is not on boundary of polyMesh . . -Alain

 February 28, 2008, 17:54 Sorry to state the obvious: Th #4 Member   Ola Widlund Join Date: Mar 2009 Location: Sweden Posts: 87 Rep Power: 10 Sorry to state the obvious: The bc on the cube walls should be "wall". Not so sure how to deal with the Gmsh mesh, though. What you are looking for is an empty hole for the cube in the middle of your mesh. If that is not what you have, let's hope an expert user of Gmsh reads this thread and comes to your rescue... Thing is that boundaries in OF have cells only on one side, i.e. they must be exteriour faces (="on boundary of polyMesh", see your warning message). If you *do* have a whole in the middle, then there should be tools to pick up those faces (e.g. using the faceSet utility), and then create a wall patch for them (with some other utility). There are plenty of nifty utilities, the trick is just to know of their existens and understand how they work... /Ola

 February 29, 2008, 07:46 I have downloaded a 3d case fr #5 Member   Alain Martin Join Date: Mar 2009 Posts: 40 Rep Power: 10 I have downloaded a 3d case from somewhere in this forum ( 3d_tar-1985.tgz) . In that case, two faces of the cube are touching the chamber walls.What I want to know is if it is possible to have a cube completely inside the chamber? -Alain

 February 29, 2008, 13:21 Good news. I have a solution f #6 Member   Alain Martin Join Date: Mar 2009 Posts: 40 Rep Power: 10 Good news. I have a solution for a cube completely inside the chamber.I am using the sonicTurboFoam solver with the prism case. I have to look carrefully at how I got it, starting from Gmsh and producing a mesh and then using gmshToFoam to generate a mesh to be used in the solution. -Alain

 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 Jack Martinez FLUENT 13 August 11, 2010 06:29 kit Autodesk Simulation CFD 1 September 19, 2006 07:37 spepsicho FLUENT 3 March 8, 2006 07:23 wilson CFX 5 July 4, 2005 19:16 Anders Hagberg Main CFD Forum 9 June 1, 2004 17:42

All times are GMT -4. The time now is 23:04.