IGNITING COMBUSTION MIXTURE IN reactingFoam HOW msha

msha · November 25, 2008, 06:27

HOW COULD BE A MIXTURE IN reactingFoam IGNITED?

markusrehm · November 25, 2008, 08:13

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, 01:48

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 1, 2008, 23:57

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

ash · December 2, 2008, 00:19

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, 04:06

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

niklas · December 2, 2008, 07:00

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, 03:00

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, 06:13

fixed!

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

msha · December 13, 2008, 02:27

thank you!

But this does not solve the problem NIKLAS!

Janaf thermo error still remains after enthalpy increase

msha · December 13, 2008, 02:31

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, 05:44

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, 05:46

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, 05:57

I thinks the problem arises when this function

"meshSearch::findCell" is called.

Is my guess true?

Any suggestion is appreciated!

msha · December 15, 2008, 03:00

Any help?

msha · December 18, 2008, 01:31

Isn't here Some one to help with this!

vijayakumar · January 15, 2009, 03:55

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, 03:58

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, 02:16

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

viji · February 4, 2009, 00:58

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

November 25, 2008, 06:27	HOW COULD BE A MIXTURE IN reac	#1
msha Member Mojtaba Shahmohammadian Join Date: Mar 2009 Posts: 73 Rep Power: 17	HOW COULD BE A MIXTURE IN reactingFoam IGNITED?

November 25, 2008, 08:13	Hello Mojtaba, set an initi	#2
markusrehm Senior Member Markus Rehm Join Date: Mar 2009 Location: Erlangen (Germany) Posts: 184 Rep Power: 17	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

December 1, 2008, 01:48	hi thank you for advice	#3
msha Member Mojtaba Shahmohammadian Join Date: Mar 2009 Posts: 73 Rep Power: 17	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.!

December 1, 2008, 23:57	IS NOT HERE ANY ONE TO SHARE E	#4
msha Member Mojtaba Shahmohammadian Join Date: Mar 2009 Posts: 73 Rep Power: 17	IS NOT HERE ANY ONE TO SHARE EXPERIENCE ON THIS!!?

December 2, 2008, 00:19	I think you have to look into	#5
ash New Member Arun Shourie Join Date: Mar 2009 Location: Singapore Posts: 12 Rep Power: 17	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.

December 2, 2008, 04:06	this is not the way you mentio	#6
msha Member Mojtaba Shahmohammadian Join Date: Mar 2009 Posts: 73 Rep Power: 17	this is not the way you mentioned Arun. ANY SUGGESTIONS???

December 2, 2008, 07:00	Yes, I have a suggestion. stop	#7
niklas Super Moderator Niklas Nordin Join Date: Mar 2009 Location: Stockholm, Sweden Posts: 693 Rep Power: 29	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

December 7, 2008, 03:00	thanks alot Nordin, it seems t	#8
msha Member Mojtaba Shahmohammadian Join Date: Mar 2009 Posts: 73 Rep Power: 17	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

December 8, 2008, 06:13	fixed! http://openfoamwiki.	#9
niklas Super Moderator Niklas Nordin Join Date: Mar 2009 Location: Stockholm, Sweden Posts: 693 Rep Power: 29	fixed! http://openfoamwiki.net/index.php/Contrib_reactingFoam

December 13, 2008, 02:27	thank you! But this does no	#10
msha Member Mojtaba Shahmohammadian Join Date: Mar 2009 Posts: 73 Rep Power: 17	thank you! But this does not solve the problem NIKLAS! Janaf thermo error still remains after enthalpy increase

December 13, 2008, 02:31	Niklas you must first compu	#11
msha Member Mojtaba Shahmohammadian Join Date: Mar 2009 Posts: 73 Rep Power: 17	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;

December 14, 2008, 05:44	Another vague problem: Duri	#12
msha Member Mojtaba Shahmohammadian Join Date: Mar 2009 Posts: 73 Rep Power: 17	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!!!

December 14, 2008, 05:46	Another vague problem: Duri	#13
msha Member Mojtaba Shahmohammadian Join Date: Mar 2009 Posts: 73 Rep Power: 17	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!!!

December 14, 2008, 05:57	I thinks the problem arises wh	#14
msha Member Mojtaba Shahmohammadian Join Date: Mar 2009 Posts: 73 Rep Power: 17	I thinks the problem arises when this function "meshSearch::findCell" is called. Is my guess true? Any suggestion is appreciated!

December 15, 2008, 03:00	Any help?	#15
msha Member Mojtaba Shahmohammadian Join Date: Mar 2009 Posts: 73 Rep Power: 17	Any help?

December 18, 2008, 01:31	Isn't here Some one to help wi	#16
msha Member Mojtaba Shahmohammadian Join Date: Mar 2009 Posts: 73 Rep Power: 17	Isn't here Some one to help with this!

January 15, 2009, 03:55	i am new to openfoam i am solv	#17
vijayakumar New Member VIJAYAKUMAR R Join Date: Mar 2009 Location: BANGALORE, KARNATAKA, INDIA Posts: 20 Rep Power: 17	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.

January 15, 2009, 03:58	i am new to openfoam i am solv	#18
vijayakumar New Member VIJAYAKUMAR R Join Date: Mar 2009 Location: BANGALORE, KARNATAKA, INDIA Posts: 20 Rep Power: 17	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.

January 17, 2009, 02:16	reactingFoam,dieselFoam and di	#19
msha Member Mojtaba Shahmohammadian Join Date: Mar 2009 Posts: 73 Rep Power: 17	reactingFoam,dieselFoam and dieselEngineFoam solve non-premixed combustion. Others solve premixed and partially premixed combustion

February 4, 2009, 00:58	hi to everyone i am new to	#20
viji New Member pavan Join Date: Mar 2009 Location: BANGALORE, KARNATAKA, INDIA Posts: 7 Rep Power: 17	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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