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premixed combustion using Zimont model

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Old   May 7, 2004, 10:19
Default premixed combustion using Zimont model
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bob
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Hi Is somebody has done some premixed combustion simulations using zimont I want to discuss some issues. Please respond. Bob
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Old   May 7, 2004, 10:29
Default Re: premixed combustion using Zimont model
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Tom
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I have used this model for methane-air combustion. It works well.
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Old   May 7, 2004, 11:24
Default Re: premixed combustion using Zimont model
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bob
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Thanks I have some simple questions.

I started simulating the propane-air combustion using Zimnot model and adiabatic.

During starting of the simulation residual was decresing and then suddenly it started to increase do you know th reason or help me.

Also how can I dcribe outflow boundary condition for progress variable is it specified in pressure outlet boundary condition where back flow progress variable is taken to be 1.0.

Also what is the best way do simulations first compute the steady using non-reactive flows and then start the combustion calculation.

Thanks for your asnwers bob
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Old   May 7, 2004, 11:47
Default Re: premixed combustion using Zimont model
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Tom
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1. If you post your e-mail address I can send you some information that may help.

2. What residuals started to increase. This could be for many reasons, for example, grid quality, how you initialized the solution, under relaxation factors etc...

3. For your outlet condition you can either use Pressure Outlet or Outflow. Pressure Outlet may be more stable and in a combustion simulation which is never easy may give better stability. The progress variable states that if the mixture is burnt then c=1, therefore at the outlet where you would expect this the backflow value should be set to 1.

4. This is up to you and depends on the complexity of the flow field. In general you should start with a isothermal model and build up. I have used this model with combustion form the start and patched a fluid region to iginite the mixture.

Hope this helps Tom
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Old   May 7, 2004, 12:33
Default Re: premixed combustion using Zimont model
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bob
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Thanks it works fine when you have non-adiabatic combustion when you have adiabatic combustion it is giving me a problem.

By the way how to specify equaivalence ratio of the mixture let us say I want to simulate lean premix so Equivalence ratio=0.6. Thanks for your response bob
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Old   May 10, 2004, 01:49
Default Re: premixed combustion using Zimont model
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bob
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Hi tom I am expecting answers for this question I hope you know the answer. Bye Bob By the way you can send me the helpful document in

bob_00_bob2001@yahoo.com

Thanks for your help Bye bob
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Old   May 10, 2004, 05:48
Default Re: premixed combustion using Zimont model
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Tom
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I have sent you some info to your email which should answer your question.

Hope it helps.
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Old   November 22, 2012, 06:50
Question How to specify equivalence ratio in premixed combustion model?
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Hesham Khalil
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Hey guys, i have the same problem of not knowing how to specify the equivalence ratio in the premixed combustion model either in adiabatic or non-adiabatic case?
could you please help? my mail is hekhalil@gmail.com
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Old   March 19, 2015, 06:04
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Howar
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Quote:
Originally Posted by bob
;112380
Hi Is somebody has done some premixed combustion simulations using zimont I want to discuss some issues. Please respond. Bob
Hello, I'm a new user of OpenFoam. Could I ask how to use this zimont model? In XiFoam or reactiongFoam? Could you give me some information
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