Convergence criteria for DPM and Non Premixed combustion

pkp · April 13, 2016, 18:47

I am working on a Non Premixed combustion module with DPM for spray modelling. For first few time steps I can reach to the convergence easily, but once fuel starts injecting, the convergence is really a big problem. The problem is fully unsteady and it has more complexities like evaporation of spray, breakup of particles and wall film. Generally I face problems with the continuity residual, which goes up to max 2e-2.
Is this value acceptable for the nearby answers ? Can anybody tell me the solution for this convergence ?

Thanks !! :B

gush · April 16, 2016, 18:03

hi pkp,
my study field is far more different than yours (contaminant transport in rooms).
i can simulate continuous phase as you said easily with 10e-06. but when i interact it with DPM especially continuity does not converge. it stucked nearly at 10e-2.
many researchers from different areas have also the same problem which i read in this forum.

i could not solve it yet. please let me know if you reach any proper solution for that.

April 13, 2016, 18:47	Convergence criteria for DPM and Non Premixed combustion	#1
pkp New Member Presteina Join Date: Feb 2016 Location: Canada Posts: 16 Rep Power: 11	I am working on a Non Premixed combustion module with DPM for spray modelling. For first few time steps I can reach to the convergence easily, but once fuel starts injecting, the convergence is really a big problem. The problem is fully unsteady and it has more complexities like evaporation of spray, breakup of particles and wall film. Generally I face problems with the continuity residual, which goes up to max 2e-2. Is this value acceptable for the nearby answers ? Can anybody tell me the solution for this convergence ? Thanks !! :B

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April 16, 2016, 18:03		#2
gush Member yun Join Date: Jul 2015 Posts: 37 Rep Power: 12	hi pkp, my study field is far more different than yours (contaminant transport in rooms). i can simulate continuous phase as you said easily with 10e-06. but when i interact it with DPM especially continuity does not converge. it stucked nearly at 10e-2. many researchers from different areas have also the same problem which i read in this forum. i could not solve it yet. please let me know if you reach any proper solution for that.