convergence problem of a simple DPM simulation

amin.z · December 16, 2015, 13:17

Hi everybody,

I'm trying to simulate a 2-phase flow passing some bends using Discrete Phase Method. air is the career phase and the discrete phase is coal powder.
I have convergence problem and tried several trick to control the solution, but I'm afraid I wasn't able to make it converge adequately.
I will be appreciate if everybody share with me his suggestion for my trouble.

Here there are some specification:
Grid: Quad, 3D
iso-thermal condition, incompressible gas
sst k-omega turbulent model,
injection from surface,
steady state solver
two-way turbulent coupling: active

Thanks in advance

gush · April 11, 2016, 16:36

hi amin,
did you solved your problem?
i have a similar problem. steady continuous phase converged without DPM. but when i interact them (two way coupling) it became impossible.

in some tutorials that i found in the web there are some advises for this problem:
-increase "number of continuos phase iterations per DPM iteration"
-in "Numerics" tab "Enable Node based averaging" (this can increase solution time)
etc.

but i tried all of them and nothing changed!!

valuable comments appreciated!

December 16, 2015, 13:17	convergence problem of a simple DPM simulation	#1
amin.z Senior Member Amin Join Date: Oct 2013 Location: Germany Posts: 397 Rep Power: 15	Hi everybody, I'm trying to simulate a 2-phase flow passing some bends using Discrete Phase Method. air is the career phase and the discrete phase is coal powder. I have convergence problem and tried several trick to control the solution, but I'm afraid I wasn't able to make it converge adequately. I will be appreciate if everybody share with me his suggestion for my trouble. Here there are some specification: Grid: Quad, 3D iso-thermal condition, incompressible gas sst k-omega turbulent model, injection from surface, steady state solver two-way turbulent coupling: active Thanks in advance

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April 11, 2016, 16:36		#2
gush Member yun Join Date: Jul 2015 Posts: 37 Rep Power: 11	hi amin, did you solved your problem? i have a similar problem. steady continuous phase converged without DPM. but when i interact them (two way coupling) it became impossible. in some tutorials that i found in the web there are some advises for this problem: -increase "number of continuos phase iterations per DPM iteration" -in "Numerics" tab "Enable Node based averaging" (this can increase solution time) etc. but i tried all of them and nothing changed!! valuable comments appreciated!