[remir]

Hi,

I actually took all my thermo datas from GRI-Mech, so I don't really know how to retrieve the species' data you are asking.

Good luck with that !

[Howard]

Originally Posted by remir

Hi,

I actually took all my thermo datas from GRI-Mech, so I don't really know how to retrieve the species' data you are asking.

Good luck with that !

Hi, remir. I am thinking that in XiFoam there is a reaction progress variable for premixed combustion, but for reacting foam why there is not such parameter? Only because XiFoam using the flamelet concept?

[Howard]

Originally Posted by remir

Hi,

I actually took all my thermo datas from GRI-Mech, so I don't really know how to retrieve the species' data you are asking.

Good luck with that !

Hi, Remir. I tried the case you uploaded, and I modified it with multi-step but after I run it for a period of time, I found there is no combustion. Do you think what the reason is?
I think if the one step could work, my modification should also work, since I only changed the mechanism. I am really confused. Could you give me some advice? Thank you!

[fcrl-zxr]

Hi Remir,

I downloaded your case "methanePremixed.zip", however it seems something wrong with the file. Would you please send me the case via email? Thank you so much. my email address: 13903423r@connect.polyu.hk

[reza_65]

Originally Posted by Howard

Thank you so much for your reply! Really beneficial. I will have a try of what you told.
Now I operate the reactingFoam and XiFoam, but the result seems not the same. I am considering the 'combustion properties' maybe the reason, for your reactingFoam case, the combustionMoel is PaSR_ but XiFoam not. So do you know is there any other combustionMoel available in reactionFoam? or where to find this information.
The other thing is in XiFoam 'combustionProperties' has some paramerters like ignitionthickness,ignitionSphereFraction which your reactingFoam case doesn't have. Do you think the sentences of ignition can be added to reactingFoam?

I am sure you should've resolved your problem, but just in case if anybody else, has got the same problem for ignition, I am answering this post:

One of the easiest ways for igniting your fuel in reactingFoam, is; you can put a cylinder or sphere patch in your setFields, and add burned products value in that fields. (such as High Temperature, 0 or nearly zero reactant, and products).
Best Luck
Reza

[AhmedSamy]

Originally Posted by remir

Hi,

couldn't open the dropbox link, I wanted to check your reaction file.

Anyways, if you want to artificially ignite, you can use a fvOptions file in the /system dir.
You could also set a flame front using a setField (try swak4foam if you havn't already).

If the reaction is not too complex, you can try another chemistry ODE solver than SIBS.

To answer Howard as well, here is a typical methane-air premixed case I work on, using the PitzDaily tut as a base and a simple chemistry.

Hope it helps,

Remi

Hi, when I run the problem submitted by Remir as a premixed reactingfoam under Oenfoam9, Iget the following error. What should I change on that?

hePsiThermo pureMixture sutherland janaf incompressiblePerfectGas specie sensibleInternalEnergy
hePsiThermo pureMixture sutherland janaf perfectGas specie sensibleEnthalpy
hePsiThermo pureMixture sutherland janaf perfectGas specie sensibleInternalEnergy


From function static typename Table::iterator Foam::basicThermo::lookupThermo(const Foam::dictionary&, Table*, int, const char**, const Foam::word&) [with Thermo = Foam:siReactionThermo; Table = Foam::HashTable<Foam::autoPtr<Foam:siReactionThe rmo> (*)(const Foam::fvMesh&, const Foam::word&), Foam::word, Foam::string::hash>; typename Table::iterator = Foam::HashTable<Foam::autoPtr<Foam:siReactionThe rmo> (*)(const Foam::fvMesh&, const Foam::word&), Foam::word, Foam::string::hash>::iterator]
in file /home/ubuntu/OpenFOAM/OpenFOAM-8/src/thermophysicalModels/basic/lnInclude/basicThermoTemplates.C at line 46.

FOAM exiting