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Old   May 29, 2010, 10:10
Default To ALL Combustion Foamers please join
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Hassan Kassem
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Dear Foamers,

I am a new OpenFOAM user working on non-premixed combustion flames (diffusion flames). I was using Fluent before.
Currently, I am searching for all available combustion models in OpenFOAM and I noticed the following;
  1. The models descriptions in OpenFOAM are not enough to figure out which model it is.
  2. The current combustion models in OpenFOAM 1.6.x are missing many important models, however there are many universities and research groups already implemented theses models. Unfortunately they are not sharing their codes.
For the the first point, I think by more searching and reading the codes itself man can figure out the details of the solver which is one of the main OpenFOAM advantages.
The problem is the second point because it makes open source codes lose it's essence. That will make each new user or group decides to use OpenFOAM to build its own solvers and models which already done by others. I hope that these codes are shared somewhere and it was my fault to find it. Can anyone show me where can I find the combustion models codes especially for diffusion flames? and which models are never implemented in OpenFOAM before? Where are the active combustion groups? or should we make a one?!
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Old   May 30, 2010, 11:15
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MSR CHANDRA MURTHY
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Wait for few days, in the upcoming 5th OpenFOAM workshop considerable advancement in combustion modelling is expeted.

http://web.student.chalmers.se/group...stractOFW5.pdf
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Old   May 30, 2010, 11:22
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Hassan Kassem
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Thank you
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Old   May 30, 2010, 13:05
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Alberto Passalacqua
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Quote:
Can anyone show me where can I find the combustion models codes especially for diffusion flames? and which models are never implemented in OpenFOAM before? Where are the active combustion groups? or should we make a one?!
I'm interested in the combustion group too for a project with a student. Is there one somewhere? :-)

However I don't see a major problem in re-implementing the model. Sometime it is easier than understanding others code, if not written very cleanly and documented. And in these years I have learnt that "announcements" of new features and solvers by members of the community do not mean these features will be released by the authors, and, sometime, they don't mean they are actually ready. In other words, if you need a model, start coding, don't wait
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Old   May 30, 2010, 13:23
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Hassan Kassem
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You are right. I should start coding what I need. What is your advice for a new foamer?

What do you think, should we start a new combustion group? I did not find anyone also.
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Old   May 30, 2010, 17:13
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Laurence R. McGlashan
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What exactly are you trying to model? If your chemistry is complex then you'll have to use flamelet methods. My group has a flamelet equation solver available on sourceforge which is written in C++, and I have used that to solve lagrangian style flamelets for a laminar diffusion flame successfully. Takes a long time to solve though... You're probably best off just writing it yourself to be honest, it didn't take that long.

Regarding point 2), have you actually contacted other research groups? In my experience they are often very willing to share code, you just have to ask nicely
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Old   May 30, 2010, 18:11
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Alberto Passalacqua
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Originally Posted by hk318i View Post
You are right. I should start coding what I need. What is your advice for a new foamer?

What do you think, should we start a new combustion group? I did not find anyone also.
It would be useful.

My knowledge of combustion is purely theoretical and quite limited though, since I have never actually worked on it (my interest is elsewhere, aka multiphase flow), so I doubt my contribution could be of much use :-)
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Old   May 31, 2010, 04:32
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Originally Posted by l_r_mcglashan View Post
What exactly are you trying to model? If your chemistry is complex then you'll have to use flamelet methods. My group has a flamelet equation solver available on sourceforge which is written in C++, and I have used that to solve lagrangian style flamelets for a laminar diffusion flame successfully. Takes a long time to solve though... You're probably best off just writing it yourself to be honest, it didn't take that long.

Regarding point 2), have you actually contacted other research groups? In my experience they are often very willing to share code, you just have to ask nicely
I am trying to model turbulent non-premixed flames of hydrogen-hydrocarbons fuels.
I am new OpenFOAM user and I do not have experience yet about the working groups in this area .
What is the name of your group project in sourceforge?
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Old   May 31, 2010, 04:56
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http://sourceforge.net/projects/mopssuite/ is the site, you can svn clone the repository and the flamelet solver is called 'camflow'. It can use CVODE or RADAU5 which come with the repository. There are some examples you can run it on and also you can generate some partially completed documentation using doxygen.
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Old   May 31, 2010, 05:02
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Laurence R. McGlashan
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Also, if you want an overview of turbulent combustion, I like this book:

http://www.amazon.co.uk/INTRODUCTION.../dp/1860947794

Maybe I'm slightly biased because I went on the course, but it covers almost everything and you can take it as a starting point.
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Old   May 31, 2010, 05:03
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Quote:
Originally Posted by l_r_mcglashan View Post
http://sourceforge.net/projects/mopssuite/ is the site, you can svn clone the repository and the flamelet solver is called 'camflow'. It can use CVODE or RADAU5 which come with the repository. There are some examples you can run it on and also you can generate some partially completed documentation using doxygen.

Thank you
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Old   June 8, 2010, 14:47
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Hassan Kassem
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Quote:
Originally Posted by l_r_mcglashan View Post
What exactly are you trying to model? If your chemistry is complex then you'll have to use flamelet methods. My group has a flamelet equation solver available on sourceforge which is written in C++, and I have used that to solve lagrangian style flamelets for a laminar diffusion flame successfully. Takes a long time to solve though... You're probably best off just writing it yourself to be honest, it didn't take that long.

Regarding point 2), have you actually contacted other research groups? In my experience they are often very willing to share code, you just have to ask nicely
I downloaded it, but I did not find any .C files.
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Old   June 8, 2010, 16:06
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Are you sure? What can you see? There should be trunk folders within each software directory, and they'll have include/ and source/ folders in them.
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Old   June 8, 2010, 16:24
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Hassan Kassem
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Quote:
Originally Posted by l_r_mcglashan View Post
Are you sure? What can you see? There should be trunk folders within each software directory, and they'll have include/ and source/ folders in them.

I found the following folders/
auxilliary
sweep2
xmlf90
gpl.html
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Old   June 8, 2010, 16:49
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Laurence R. McGlashan
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Ah, this code is under development, so you have to get it from the svn repository:

svn co https://mopssuite.svn.sourceforge.net/svnroot/mopssuite mopssuite

You can view the svn repository here:

http://mopssuite.svn.sourceforge.net/viewvc/mopssuite/
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Old   June 8, 2010, 17:01
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Hassan Kassem
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Quote:
Originally Posted by l_r_mcglashan View Post
Ah, this code is under development, so you have to get it from the svn repository:

svn co https://mopssuite.svn.sourceforge.net/svnroot/mopssuite mopssuite

You can view the svn repository here:

http://mopssuite.svn.sourceforge.net/viewvc/mopssuite/
Thank you
I downloaded it
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Old   June 9, 2010, 08:30
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Hassan Kassem
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Dear All,

I need your advice. I am wondering, is it possible for a new OpenFOAM user to implement the flamelet model for turbulent non-premixed flames of hydrocarbons mixture fuels like (ch4/h2) alone (as a master student)? How long will it take? How complex is it? concerning that, I will try to follow the available codes as mush as possible, It will be my full time work and I need to have some output by next September.

What do you think?
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