|February 28, 2012, 21:51||
Mesh sensitivity when using phase change models
Join Date: Sep 2011
Posts: 5Rep Power: 7
I am having problems with the variation of solidification rate when solving different mesh sizes while using the Eularian multiphase VOF model with enthalpy-melting-solidification models enabled in CCM+.
I am solving the simplest model I could make (a 10x10x10mm cube) and using adiabatic surfaces on all boundary conditions bar two. The two faces that aren't adiabatic are set at different temperatures causing a delta T across the phase change material to induce melting. I am solving in unsteady state because I want to measure the rate at which the cube will melt.
The mesh size is causing large variances in the rate at which the cube melts. A finer mesh will cause the cube to react slowly and melting takes a long time. Where as a coarser mesh will cause the cube to react faster and melt quickly. I varied the mesh from 16 cells to around 37 million cells and I haven't been able to reach convergence on my mesh sensitivity test simply because I ran out of memory (96GB!) due to fact that the finest mesh I can create is too fine (100 million cells). Has anyone experienced such a large sensitivity in mesh size before?
Feel free to ask any questions you need to.
|cd-adapco, melting, mesh, phase change, sensitivity|
|Thread||Thread Starter||Forum||Replies||Last Post|
|engrid -> save as .stl with boundarie codes||Zymon||enGrid||31||August 29, 2011 13:40|
|Change parameters for Hybrid mesh||karananand||ANSYS Meshing & Geometry||3||July 18, 2010 16:37|
|Solid/liquid phase change using large viscosity||gregor.vidmar153||OpenFOAM Running, Solving & CFD||3||June 10, 2010 06:31|
|Thermal phase change model||Piti||CFX||0||February 9, 2009 10:27|
|thermal phase change question||CFDflying||CFX||1||February 18, 2004 05:10|