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-   -   IGNITING COMBUSTION MIXTURE IN reactingFoam HOW msha (http://www.cfd-online.com/Forums/openfoam-solving/57974-igniting-combustion-mixture-reactingfoam-how-msha.html)

msha November 25, 2008 07:27

HOW COULD BE A MIXTURE IN reac
 
HOW COULD BE A MIXTURE IN reactingFoam IGNITED?

markusrehm November 25, 2008 09:13

Hello Mojtaba, set an initi
 
Hello Mojtaba,

set an initial temperature and a composition which will ignite. E.g. start the calculation without reaction and use setField to set the temperature at a ignition point to say 1500K.

Regards markus

msha December 1, 2008 02:48

hi thank you for advice
 
hi

thank you for advice

but with an initial high temperature the domain will be purged after some time steps.

this is not the way

I want a better method(to ignite)

ANY SUGGESTIONS PLS.!

msha December 2, 2008 00:57

IS NOT HERE ANY ONE TO SHARE E
 
IS NOT HERE ANY ONE TO SHARE EXPERIENCE ON THIS!!?

ash December 2, 2008 01:19

I think you have to look into
 
I think you have to look into diesel foam for this. Mixture is ignited over there. You can view its tutorial file to get an idea about ignition and stuff.

msha December 2, 2008 05:06

this is not the way you mentio
 
this is not the way you mentioned Arun.
ANY SUGGESTIONS???

niklas December 2, 2008 08:00

Yes, I have a suggestion. stop
 
Yes, I have a suggestion. stop using caps!!!

After that you can go here and have a look.

http://openfoamwiki.net/index.php/Contrib_reactingFoam

N

msha December 7, 2008 04:00

thanks alot Nordin, it seems t
 
thanks alot Nordin, it seems to be useful.
but if a better trick could be applied instead of increasing enthalpy I think it would be better,because in some circumstances temperature rises above of therm.dat limits (3500) and we have a janaf thermo error

niklas December 8, 2008 07:13

fixed! http://openfoamwiki.
 
fixed!

http://openfoamwiki.net/index.php/Contrib_reactingFoam

msha December 13, 2008 03:27

thank you! But this does no
 
thank you!

But this does not solve the problem NIKLAS!

Janaf thermo error still remains after enthalpy increase

msha December 13, 2008 03:31

Niklas you must first compu
 
Niklas

you must first compute temprature after:
h[ignCell] += ignSite.strength()*magH;

then evaluate enthalpy increase(enthalpy icrease must not cause T>3500),and after that apply:

h[ignCell] += ignSite.strength()*magH;

msha December 14, 2008 06:44

Another vague problem: Duri
 
Another vague problem:

During parallel run the term "ignSites.cells()" in file "ignite.H" returns no cell and ignition does not occur.

but with a single cpu there is no problem.

Any suggestions!!!

msha December 14, 2008 06:46

Another vague problem: Duri
 
Another vague problem:

During parallel run the term "ignSites.cells()" in file "ignite.H" returns no cell and ignition does not occur.
it does not depend on the number of cpus or the method of decomposition.
but with a single cpu there is no problem.

Any suggestions!!!

msha December 14, 2008 06:57

I thinks the problem arises wh
 
I thinks the problem arises when this function

"meshSearch::findCell" is called.

Is my guess true?

Any suggestion is appreciated!

msha December 15, 2008 04:00

Any help?
 
Any help?

msha December 18, 2008 02:31

Isn't here Some one to help wi
 
Isn't here Some one to help with this!

vijayakumar January 15, 2009 04:55

i am new to openfoam i am solv
 
i am new to openfoam i am solving one combustion problem, i need to run a combustion problem.... i used XI-foam as solver, while running some errors are coming... i need to know which solver is good for combustion problem.. and few guidelines for solving combustion problem.

vijayakumar January 15, 2009 04:58

i am new to openfoam i am solv
 
i am new to openfoam i am solving one combustion problem, i need to run a combustion problem.... i used XI-foam as solver, while running some errors are coming... i need to know which solver is good for combustion problem.. and few guidelines for solving combustion problem.

msha January 17, 2009 03:16

reactingFoam,dieselFoam and di
 
reactingFoam,dieselFoam and dieselEngineFoam solve non-premixed combustion.
Others solve premixed and partially premixed combustion

viji February 4, 2009 01:58

hi to everyone i am new to
 
hi to everyone
i am new to openfoam, i am using openfoam1.4, i want to solve simple methane combustion problem so which solver can i use for solving in openfoam.. already i solved in fluent... plz reply me


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