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IGNITING COMBUSTION MIXTURE IN reactingFoam HOW msha |
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#1 |
Member
Mojtaba Shahmohammadian
Join Date: Mar 2009
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HOW COULD BE A MIXTURE IN reactingFoam IGNITED?
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#2 |
Senior Member
Markus Rehm
Join Date: Mar 2009
Location: Erlangen (Germany)
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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 |
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#3 |
Member
Mojtaba Shahmohammadian
Join Date: Mar 2009
Posts: 73
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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.! |
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#4 |
Member
Mojtaba Shahmohammadian
Join Date: Mar 2009
Posts: 73
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IS NOT HERE ANY ONE TO SHARE EXPERIENCE ON THIS!!?
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#5 |
New Member
Arun Shourie
Join Date: Mar 2009
Location: Singapore
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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.
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#6 |
Member
Mojtaba Shahmohammadian
Join Date: Mar 2009
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this is not the way you mentioned Arun.
ANY SUGGESTIONS??? |
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#7 |
Super Moderator
Niklas Nordin
Join Date: Mar 2009
Location: Stockholm, Sweden
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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 |
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#8 |
Member
Mojtaba Shahmohammadian
Join Date: Mar 2009
Posts: 73
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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 |
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#9 |
Super Moderator
Niklas Nordin
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#10 |
Member
Mojtaba Shahmohammadian
Join Date: Mar 2009
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thank you!
But this does not solve the problem NIKLAS! Janaf thermo error still remains after enthalpy increase |
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#11 |
Member
Mojtaba Shahmohammadian
Join Date: Mar 2009
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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; |
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#12 |
Member
Mojtaba Shahmohammadian
Join Date: Mar 2009
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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!!! |
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#13 |
Member
Mojtaba Shahmohammadian
Join Date: Mar 2009
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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!!! |
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#14 |
Member
Mojtaba Shahmohammadian
Join Date: Mar 2009
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I thinks the problem arises when this function
"meshSearch::findCell" is called. Is my guess true? Any suggestion is appreciated! |
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#15 |
Member
Mojtaba Shahmohammadian
Join Date: Mar 2009
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Any help?
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#16 |
Member
Mojtaba Shahmohammadian
Join Date: Mar 2009
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Isn't here Some one to help with this!
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#17 |
New Member
VIJAYAKUMAR R
Join Date: Mar 2009
Location: BANGALORE, KARNATAKA, INDIA
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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.
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#18 |
New Member
VIJAYAKUMAR R
Join Date: Mar 2009
Location: BANGALORE, KARNATAKA, INDIA
Posts: 20
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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.
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#19 |
Member
Mojtaba Shahmohammadian
Join Date: Mar 2009
Posts: 73
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reactingFoam,dieselFoam and dieselEngineFoam solve non-premixed combustion.
Others solve premixed and partially premixed combustion |
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#20 |
New Member
pavan
Join Date: Mar 2009
Location: BANGALORE, KARNATAKA, INDIA
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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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