# Morph mesh given displacement of boundary points

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

 November 5, 2011, 02:12 Morph mesh given displacement of boundary points #1 Super Moderator     Praveen. C Join Date: Mar 2009 Location: Bangalore Posts: 265 Blog Entries: 6 Rep Power: 11 Hello Is there anything in openfoam which allows me to morph the interior mesh, given the displacement of the boundary mesh nodes ? praveen

 November 5, 2011, 04:04 #2 Super Moderator   Bruno Santos Join Date: Mar 2009 Location: Lisbon, Portugal Posts: 10,021 Blog Entries: 39 Rep Power: 109 Hi Praveen, Does this tutorial suit your requirements: "tutorials/mesh/moveDynamicMesh/simpleHarmonicMotion" Best regards, Bruno __________________ OpenFOAM: FAQ | Getting started Forum: How to get help, to post code/output and forum guide What am I doing/planning: blog/wiki Read this before sending me PM

 November 5, 2011, 07:05 #3 Super Moderator     Praveen. C Join Date: Mar 2009 Location: Bangalore Posts: 265 Blog Entries: 6 Rep Power: 11 Thanks. That seems relevant to me. I will check it out. Is it possible to specify the displacement of each individual boundary mesh point ?

 November 5, 2011, 08:33 #4 Senior Member   Niels Gjoel Jacobsen Join Date: Mar 2009 Location: Deltares, Delft, The Netherlands Posts: 1,757 Rep Power: 29 Hi Praveen, Yes, it is possible to specify the displacement on the point level. This type of boundary condition can be put into two categories: 1. You know the motion by an algebraic equation, hence you loop over every boundary point and specify the displacement (Note: Some solvers use the boundary velocity, thus differentiate your algebraric equation with respect to time and evaluate it). Furthermore, if you are using tet-decomposition (available in 1.6-ext), you specify both the motion on the points and in the centers of the boundary faces. On the boundary, they are ordered as [ ]. 2. You move the mesh based on results from the state of your simulation. Typically you can compute the motion in the face centers, and then you perform an interpolation to the points on the boundary. Again, be aware when you are using displacement or velocity solvers for the mesh motion. With respect to the interpolation methods you can either look through the forum, or so-forth you have 1.6-ext installed, you can see an example of the implementation in the file "freeSurface.C" located somewhere in the "applications/solvers" directory. A final comment: If the boundary you are moving also has a very fine boundary layer resolution, then my experience is that laplaceFaceDecomposition (1.6-ext) is the most robust combined with a very stiff mesh diffusivity next to that boundary. The diffusivity is the term in the following Laplace equation for the velocity of the mesh motion: The diffusivity is specified in the dynamicMeshDict in /constant. Good luck and kind regards, Niels fumiya likes this.

 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 tomyangbath FLUENT 18 October 12, 2016 06:57 virginie_e OpenFOAM Meshing Format & General Technical 3 February 28, 2014 01:05 Vinzent CFX 2 September 17, 2010 07:09 ARC Open Source Meshers: Gmsh, Netgen, CGNS, ... 0 February 27, 2010 11:56 michele OpenFOAM Other Meshers: ICEM, Star, Ansys, Pointwise, GridPro, Ansa, ... 2 July 15, 2005 04:15

All times are GMT -4. The time now is 14:13.