Mass balance
 

Hi everyone

I have a problem with the mass balance.

It is multi-phase (three phases) model. There are two inlets.

Inlet1: Only phase 1 Inlet2: Phase 2 and Phase 3 (0.9 and 0.1 volume fraction respectively)

Outlet is as pressure boundary. Ambient conditions and initial guess are set (vol. fraction of phase 2 is almost 1.0).

K-eps turbulence model is used and the inlet boundary conditions are set with proper parameters.

But the mass flow rate through the pressure boundary flactuate with the number of iterations.

It is very difficult to converge 3 orders. At the moment it converge near about 3 orders.

But I don't know why the mass is flactuating through the pressure boundary.

Could any one help me on this regard. Any suggestion or tips will appreciate.

Regards

Sumon

Re: Mass balance
 

Whatprogram do you use? CFX 5.5, 4.4 or Tascflow?

Astrid

Re: Mass balance
 

Hi Astrid

I am using CFX 4.3 for multi phase flow at the moment. Mass should be balance in inlets and pressure boundaries. But I have still problems.

Regards

Sumon