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March 27, 2009, 11:13 
Two phase flow

#1 
New Member
Fernando Herrera
Join Date: Mar 2009
Posts: 18
Rep Power: 9 
Hi,
I am working on modelling a two phase flow; one is solid and the other is a gas. I have a doubt regarding the continuity equation for the gas. I hope you can help me to get around this. In my model, solid and gas are reacting, while solid is falling due to gravity. The mass generated by the gassolid reactions is transfered to the gas. The continuity equation for a gas is: D(rho)/Dt = 0. But, I am wondering, if for my problem, I have to add another term that represents the total mass that is added to the gas flow. I am thinking that it should look something like this: D(rho)/Dt = R Where R is the sum of all the mass generated by the gassolid reaction. By using this equation, the SIMPLE algorithm changes a little bit. Is it ok to do this, or, should I just consider the first equation. Thanks is advance for your help. 

March 27, 2009, 19:21 
Twophase flow

#2  
Senior Member

Hi Benzaa,
If the mass of gas is increasing or decreasing  or solid mass is dec or increasing...you would require a source term on the volume fraction eqn. If you are simply solving a eulerian gas phase eqn and a lagrangian tracker for the solid phase, no rhs term exist. CFDtoy Quote:


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