|September 9, 2009, 12:56||
About a two phase simulation (gas-solid)
Join Date: Mar 2009
Posts: 18Rep Power: 6
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
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