CFD Online Logo CFD Online URL
Home > Forums > General Forums > Main CFD Forum

About a two phase simulation (gas-solid)

Register Blogs Members List Search Today's Posts Mark Forums Read

LinkBack Thread Tools Search this Thread Display Modes
Old   September 9, 2009, 12:56
Default About a two phase simulation (gas-solid)
New Member
Fernando Herrera
Join Date: Mar 2009
Posts: 18
Rep Power: 14
Benzaa is on a distinguished road
Hi, I was wondering if you could give me some advise regarding modeling of two phases system.

In my system, there is a solid reacting with a gas that is flowing inside the equipment. I have already developed a code that simulates the solution but, due the mass interaction between the gas and solid, the sum of the mass fractions is not always one.

I am addressing this problem by adjusting the density of the gas and solid with a mass balance and not with the ideal gas law. I havent finished the code, but, while working on it I found something that I would like to have some advise about it.

What I have done is to discretise the mass balance equation:

d(Rho)/dt + d(Rho Vel)/dx = S

into this with an upwind approach

(Ap)(RhoP) = (Ae)(RhoE) + (Aw)(RhoW) + Sc


Aw = max( VelW*Area, 0)
Ae = max( -VelE*Area, 0)
Ap = Aw + Ae + (VelE * Area - VelW * Area) + dt/dv - Sp
Sc = Sdt + dt/dv (Rho`)

My question is, in the central coefficient (Ap), when I use the term (VelE * Area - VelW * Area) the solution doesnt make sense at all.

When it is removed, the solution makes more sense. What could be the reason for that? and, is this a good approach for the solution of a reacting system like this one??

Please, any help will be appreciated
Benzaa is offline   Reply With Quote


Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are On
Refbacks are On

Similar Threads
Thread Thread Starter Forum Replies Last Post
Exhaust Gas manifold simulation shrinath Siemens 6 September 5, 2013 16:26
solid liquid phase change (melting/solidification) ernane CFX 0 February 3, 2009 14:24
Viscosity for solid dispersed phase in E-E modelin Kushagra FLUENT 0 June 27, 2008 19:01
allowed gas phase escape Abu-Khawlah FLUENT 0 August 20, 2005 10:14
UDFs for Scalar Eqn - Fluid/Solid HT Greg Perkins FLUENT 0 October 11, 2000 03:43

All times are GMT -4. The time now is 07:01.