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how to solve isat problem in fluent?

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Old   September 9, 2004, 08:55
Default how to solve isat problem in fluent?
  #1
yinyue
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i am using fluent6.1 to solve combustion problem.when i use isat under EDC model,fluent gives me the error message: Error: isat_table_init: xscale must be positive; xscale = 0.000000e+00 Error Object: () what is it meaning? how can i solve the problem? thanks for your answer.
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Old   September 9, 2004, 22:17
Default Re: how to solve isat problem in fluent?
  #2
cg
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I think that this was a bug that occurs when the operating pressure was set to zero. I think that this has been fixed in the latest version of Fluent (6.1.22). What version are you using now?
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Old   September 10, 2004, 08:48
Default Re: how to solve isat problem in fluent?
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yinyue
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i am using 6.1.22 thank you for your answer have you some way to solve it?
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Old   September 10, 2004, 09:01
Default Re: how to solve isat problem in fluent?
  #4
yinyue
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i change operating pressure to 12Pa, and FLUENT does not gives the error message. but i want to know whether it will do some harm to the result
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Old   September 13, 2004, 09:10
Default Re: how to solve isat problem in fluent?
  #5
cg
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You can raise the operating pressure to 12Pa and then decrease your (initial) gauge pressure in the Solve -> Initialize panel by 12Pa. Please see the Fluent user guide.
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Old   October 6, 2004, 13:48
Default how to solve combustiona problem
  #6
rajagopal
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hello sir,

kindly need your help.

let me have a brief introduction. i am rajagopal doing final mechanical in bannari amman institute of technology, sathyamangalam.

i am learning the fluent in PSG technology, coimbatore.

i am analyzing the flame path and shape inside an bagasse fired combustion chamber of bannari amman cogeneration unit.

till date i have constructed the combustion chamber model in gambit and have meshed and exported it.

also just for sample purpose i have given air as input and checked the flow.

let me first describe the inlet points. there are 5 inlets for bagasse, 5 inlets for air justbelow the bagasse inlets to make the bagasse spread inside the combustion chamber . also air enters through undergrate which is the bottom portion oof the combustion chamber.

now my doubt is::

1. bagasse is not given in the materials list. so how to add it to the materials list.

2. i have created prepdf for bagasse. but the thing is that how can i think that bagasse will flow exactly in the inlet meant for it.

3.how could i differentiate the bagasse and air getting inside the comustion chamber.

even some more little doubts i have.

so sir if you could clarify these doubts, i could ensue my project.

and if u wish i can even send the works which we have performed till date.

awaiting for your valuale reply.

thanks in advance.
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Old   October 13, 2004, 07:18
Default Re: how to solve combustiona problem
  #7
Karthick
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Dear Rajagopal

I think u are solving the problem through non-premixed combustion model. In that you can add your oxidiser and fuel composition through pre-pdf

Regards Karthick
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