|March 21, 2012, 20:59||
how does CFX deal with mass conservation?
Join Date: Mar 2009
Posts: 22Rep Power: 8
As we know, CFX uses control volume finite volume method (CVFEM) to discretize the equations. These equations are integrated over each control volume,and Gauss' Divergence theorem is applied to convert volume integrals to surface integrals. The solution field must be approximated at integration points. CFX used finite-element shape functions to perform these approximations.
So, at transport equation, the convection term is discretized as:
where, rho, density;U, velocity; dnj, surface area of j direction; np, number of integral points.
But, using the exported CFX conservative velocity, i found mass is not conserved in some control volume when i calculate the mass flux through all the control volume faces.
So, i wondered, is the velocity at the iintegration point performed using shape function ? Or how does it use the mass flux at integration point when calculating the transport equation such as heat transfer?
|Thread||Thread Starter||Forum||Replies||Last Post|
|Mass conservation in VOF steady state||deepak7937||FLUENT||0||November 21, 2011 07:58|
|Mass conservation in COMSOL||Diego||Main CFD Forum||1||December 27, 2010 06:14|
|Mass conservation problem in mixing tank multiphase simulation||rockewan||FLUENT||0||April 6, 2010 12:34|
|CFX mass flow boundary condition||Michele Cagna||CFX||3||February 22, 2007 16:52|
|Mass Conservation||Balaji||FLUENT||0||May 11, 2005 07:16|