Coal Gasification

lalannitw · February 12, 2018, 04:31

Hi everyone,
I am doing 2-D simulation of coal gasification.

reversed flow in 18 faces on pressure-outlet 7.
# Divergence detected in AMG solver: x-momentum -> Increasing relaxation sweeps!
# You may try the enhanced divergence recovery with (rpsetvar 'amg/protective-enhanced? #t)

I am getting this error at the start of iteration. Please do share if anyone know how to fix this error.

Thank you.

lalannitw · February 15, 2018, 02:35

Yeah, i have fixed the problem.

Thank You.

cesaralonzo · March 9, 2018, 08:40

Dear kumar

Which approach, did you use? Euler-Euler or Euler-Lagrange.

lalannitw · March 15, 2018, 03:43

Hi Dear,

I am using euler- lagrangian method for gas solid phase interaction.

Thanks.

cesaralonzo · March 15, 2018, 05:04

Dear Kumar,

Thanks for replying, i am working in cfd simulation of biomass gasification.
i've heard it is necessary to use a udf fonction for ractions rates.

For the reactions rate did you have to use a udf fonction?
I would be very glad to ask you some questions about. Can i have your email ?

My email is: luisreyesalonzo@gmail.com

lalannitw · March 21, 2018, 00:18

Hi Dear,
i am working on CFD modelling of coal slurry gasification. And in my case, there no udf used for reactions.

Thanks.

susilonr · March 21, 2018, 11:03

Quote:

Originally Posted by lalannitw

Hi everyone,
I am doing 2-D simulation of coal gasification.

reversed flow in 18 faces on pressure-outlet 7.
# Divergence detected in AMG solver: x-momentum -> Increasing relaxation sweeps!
# You may try the enhanced divergence recovery with (rpsetvar 'amg/protective-enhanced? #t)

I am getting this error at the start of iteration. Please do share if anyone know how to fix this error.

Thank you.

hello there,
how you solve the problem, because i get the same problem like you
please help

Thanks in advance..

lalannitw · March 22, 2018, 03:26

Hi there,
You are doing 2-D or 3-D simulation?

February 12, 2018, 04:31	Coal Gasification	#1
lalannitw New Member lalan kumar singh Join Date: Aug 2017 Posts: 12 Rep Power: 8	Hi everyone, I am doing 2-D simulation of coal gasification. reversed flow in 18 faces on pressure-outlet 7. # Divergence detected in AMG solver: x-momentum -> Increasing relaxation sweeps! # You may try the enhanced divergence recovery with (rpsetvar 'amg/protective-enhanced? #t) I am getting this error at the start of iteration. Please do share if anyone know how to fix this error. Thank you.

March 9, 2018, 08:40	Model Used	#3
cesaralonzo New Member luis Reyes Alonzo Join Date: Oct 2017 Location: Rouen France Posts: 5 Rep Power: 8	Dear kumar Which approach, did you use? Euler-Euler or Euler-Lagrange. __________________ Luis Reyes PhD student Insa Rouen France

March 15, 2018, 05:04	udf	#5
cesaralonzo New Member luis Reyes Alonzo Join Date: Oct 2017 Location: Rouen France Posts: 5 Rep Power: 8	Dear Kumar, Thanks for replying, i am working in cfd simulation of biomass gasification. i've heard it is necessary to use a udf fonction for ractions rates. For the reactions rate did you have to use a udf fonction? I would be very glad to ask you some questions about. Can i have your email ? My email is: luisreyesalonzo@gmail.com __________________ Luis Reyes PhD student Insa Rouen France

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February 15, 2018, 02:35		#2
lalannitw New Member lalan kumar singh Join Date: Aug 2017 Posts: 12 Rep Power: 8	Yeah, i have fixed the problem. Thank You.

March 15, 2018, 03:43		#4
lalannitw New Member lalan kumar singh Join Date: Aug 2017 Posts: 12 Rep Power: 8	Hi Dear, I am using euler- lagrangian method for gas solid phase interaction. Thanks.

March 21, 2018, 00:18		#6
lalannitw New Member lalan kumar singh Join Date: Aug 2017 Posts: 12 Rep Power: 8	Hi Dear, i am working on CFD modelling of coal slurry gasification. And in my case, there no udf used for reactions. Thanks.

March 22, 2018, 03:26		#8
lalannitw New Member lalan kumar singh Join Date: Aug 2017 Posts: 12 Rep Power: 8	Hi there, You are doing 2-D or 3-D simulation?