
[Sponsors] 
Is it possible to use divergence in the source term of an scalar transport equation? 

LinkBack  Thread Tools  Display Modes 
January 8, 2010, 20:53 
Is it possible to use divergence in the source term of an scalar transport equation?

#1 
New Member
Join Date: Jan 2010
Posts: 5
Rep Power: 9 
Hey everyone!!
I have the following problem. I'm trying to implement "Thermophoretic Force/Velocity" in Ansys CFX12. The thermophoretic velocity/force depends on the temperature gradient, which is easy to get in CFX Pre. I want to include the thermophoretic force because of the effect of depostion on particles in aerosol flows. But the main problem I have is defining the source term of the scalar transport equation of the particles. The source term should look like this: div(rho*N_particle*u_th) The complete Transport Equation should look like this: d(rho*N_particle)/dt+div(rho*u*N_particle)=div((rho*N_particle*u_th) where N is the transported scalar, rho is the density an u_th is the termophoretic velocity vector. Is there any possibilty to define this source term with CEL or any other method. Is there a possibilty in CFX to calculate the divergence of a Sourceterm? Or is it possible to define something like a "slip velocity" for a scalar transport equation? The convection term should then look like this: div(rho*Psi*(U+U_slip)) where Psi is the general transported scalar Thanks a lot!!!!!! I tried a lot by using "diffusive transport equations" (the main idea was to hide the thermophoretic velocity in the duffusioncoefficient) but nothing works. I'm very thankful for every tip! With best regards, Jan Last edited by jannnesss; January 9, 2010 at 09:37. 

Thread Tools  
Display Modes  


Similar Threads  
Thread  Thread Starter  Forum  Replies  Last Post 
Problem of SOURCE term gradient in UDS  wind  Fluent UDF and Scheme Programming  5  June 21, 2013 05:39 
Adding implicit source term to momentum equation  fs82  OpenFOAM  6  September 23, 2009 03:29 
Scalar transport equation dimension problem  litonx  OpenFOAM Running, Solving & CFD  3  March 2, 2007 07:49 
how to set velocity in certain place in CFX5  cfxbeginer  CFX  6  July 7, 2003 18:38 
How to deal with this energy equation source term?  H.S.Fang  FLUENT  2  December 27, 2001 07:42 