# Porosity function

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

 October 18, 2002, 03:13 Porosity function #1 Pawel Guest   Posts: n/a Hello, Have you ever heard about using so-called porosity function to describe boundary conditions in case when the physical boundary is not linear with the edges of the computational cells? I know that the idea is based on implementing a function, with values between 0 and 1 (0 - a cell is filled with boundary, 1 - a cell is filled with fluid only, between 0 and 1 - a cell is partially filled with fluid and boundary. The same you do with the cell edges). You modify the equations of conservation by putting the values into them (just as it is done for porous media). It is something I would like to do: to use the Cartesian mesh with objects on it, but the objects are not going to be rectangular at all - you may assume that they have a staircase geometry or use the porosity function or .... Have anybody of you tried the technique? Or maybe you know another method for doing the same (the walls or objects are not "rectangular" but the mesh is) - it seems to me that some ideas from VOF may be adapted but I do not know too much about it. Maybe you know some references to that (Internet sites, papers, and so on)? Best regards, Pawel

 October 21, 2002, 12:47 Re: Porosity function #2 Wen Long Guest   Posts: n/a Hi, pawel: please look at : Surf Zobe dynamics simulated by a Boussinesq type Model. Part I. Model description and cross-shore motion of regular waves. By P.A.Madsen, O.R.Sorensen and H.A.Schaffer, Coastal Engineering, V32, 1997, pp255-287 It's a good simple approach for waves on a beach, but it needs necessary numerical filtering and some other tricks in the code. wen

 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 ivanyao OpenFOAM Running, Solving & CFD 1 October 12, 2012 09:31 Chrisi1984 OpenFOAM Installation 0 December 31, 2010 07:42 phsieh2005 OpenFOAM Bugs 25 February 9, 2010 05:37 skabilan OpenFOAM Installation 3 July 28, 2009 00:35 Rasmus Gjesing (Gjesing) OpenFOAM Native Meshers: blockMesh 10 April 2, 2007 14:00

All times are GMT -4. The time now is 16:47.