|May 22, 2014, 18:09||
Problem with validation of regionCouple solver
Join Date: Aug 2013
Posts: 34Rep Power: 4
I am working on a solver for Stefan problems - i.e. a sharp interface (typically moving) separating two different regions. I started with conjugateHeatFoam from foam-extend-3.0. I solve a Laplace equation for the pressure in two regions with different permeability and then solve for a concentration field (convection-diffusion) in the inner region. Solver is attached (stefanFoam.tar.gz).
In the test problem the interface between the regions has a cosine profile x=1+A*cos(2*pi*y) with -0.5<y<0.5, with A constant. For clarity I choose both perms to be unity so that on the boundary between the domains the pressure should be simply -x if the pressure at the inlet is zero and the pressure gradient at the outlet is -1. The plots show the pressure from OpenFOAM (blue) vs the analytic solution (red). If the amplitude A is 0.02 (or larger) the solution is correct but for A=0.01 the variation in pressure is much too small (by more than an order of magnitude). In fact there is a more or less discontinuous change in behavior; A=0.014 is fine and A=0.013 is not. I have played with grid resolution, domain size, fvSchemes and fvSolution but to no avail.
The illustrated problems can be run from the attached tarballs. The python functions in scripts/tools/py can be used to make new blockMeshDict files if needed.
Does anyone have any suggestions?
Last edited by tladd; May 23, 2014 at 08:12. Reason: Correct x to -x in paragraph 2 (after simply)
|Thread||Thread Starter||Forum||Replies||Last Post|
|Is there a problem in the Euler solver?||Combas||SU2||4||March 28, 2014 16:48|
|[ANSYS Meshing] Problem with axisymmetric solver||Rasel||ANSYS Meshing & Geometry||0||June 20, 2012 04:35|
|CFX-Pre problem, pls help!!!||cth_yao||CFX||0||February 17, 2012 01:52|
|mesh.update problem in a new FSI solver||ICL||OpenFOAM||0||October 8, 2011 14:16|
|patching problem unsteady solver||yellow-stuff||Main CFD Forum||0||September 25, 2009 01:26|