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How to add transport equations

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Old   January 8, 2009, 18:16
Default Hi guys I am trying to simu
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Ali Mansouri
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Hi guys

I am trying to simulate a simple mixing problem,
2D, single phase, turbulent and mixing in cross flow jets...

how can I add two species equations? should I use turboFoam ?

is there any tutorial etc ?

thank you!
Ali.
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Old   January 9, 2009, 06:37
Default Hi Ali, here's a simple exa
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Ville Tossavainen
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Hi Ali,

here's a simple example how to add a (passive) scalar to an existing solver:

http://openfoamwiki.net/index.php/Ho...ure_to_icoFoam

The example is for laminar solver, but in the similar way you can start from turbulent flow solver. "simpleFoam" is for steady-state problems and "turbFoam" for transient problems.

Hope this helps!

Ville
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Old   January 9, 2009, 18:05
Default thanks Ville! have you see
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Ali Mansouri
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thanks Ville!

have you seen any tutorial in this area ?

Ali.
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Old   January 11, 2009, 08:33
Default At the end of the wiki webpage
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Ville Tossavainen
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At the end of the wiki webpage there is a case file for the cavity flow case. But once you have created the solver, most of the work is done. Then you can just apply it to your case.

Or if you insist to have a simpler case, you can first modify icoFoam elbow mixing tutorial for one passive scalar.
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Old   January 12, 2009, 16:00
Default Hi Ville If I would like to
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Ali Mansouri
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Hi Ville

If I would like to have two passive scalars, then should I add two equations ?

since in Fluent you add only one and the second one its just decuction from the whole field (e.g. concentration).

do you also have any idea about this error

Foam Fatal error" attempt to read beyond EOF"

thanks alot!
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Old   January 12, 2009, 16:46
Default Yes, that's correct. Two equat
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Ville Tossavainen
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Yes, that's correct. Two equations for two passive scalars. Twice as much to write

I'm not sure what you mean about Fluent? Practically you can do the same thing with Fluent and OpenFOAM.

The last error... check your code if you're missing any closing parenthesis or ";".

Good luck with foaming!
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Old   January 12, 2009, 17:20
Default Hi Ali! What you're talking
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Bernhard Gschaider
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Hi Ali!

What you're talking about ("in Fluent") is the case that for the two scalars the relation s1+s2==1 is always true (because there are no other species)?

In that case you can always solve for s1 and then calculate s2=1-s1

Bernhard
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