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Old   March 16, 2010, 11:15
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Emanuele Leoni
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Hi, i'm trying to put here the mail i wrote to the creator of the funkySetField application in openfoam wiki. I didn't get any answer yet so i try also in this forum, maybe someone is able to help me.
Thank you Emanuele


Hi, i'm a master student of Politecnico di Milano, and I'm developing my master thesis work on openfoam. I found your utility and i think it is what I need. My problem is about a non premixed flame in which I have a very simple axial symmetric mesh with some boundaries. The point is that i need to set some non uniform initial conditions on this boundaries, principally related to U, epsilon and k. I tried using your utility and I managed to set the U field, but i tried to set the inletfuel patch using this command:

funkySetFields -field U -valuePatches "inletfuel" -expression 'vector((2.+0.167)*(1.+0.167)/2.*pow((pow(1.01,2.167)-pow(0.01,2.167)-(2.+0.167)*pow(0.01,1.167)),-1.)*117.2*pow((1.01*pos().x/0.0018),0.167),0,0)' -time 0

the result was:

Create time

Create mesh for time = 0

Time = 0
Using command-line options

Putting "vector((2.+0.167)*(1.+0.167)/2.*pow((pow(1.01,2.167)-pow(0.01,2.167)-(2.+0.167)*pow(0.01,1.167)),-1.)*117.2*pow((1.01*pos().x/0.0018),0.167),0,0)" into field U at t = "0" if condition "true" is true
Setting the patches
1
(
inletfuel
)
to fixed value

Setting 15830 of 15830 cells
Writing to "U"
End

In this way all the cells are filled with this condition, but i need the condition only in the inlet. So i think I didn't understand very well the -valuePatches option.

I have a question more: I want the condition for every time step: how i can set this?

I really hope you can help me.
Thank you very much

Emanuele
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Old   March 16, 2010, 13:07
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Michael Jaworski
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I don't know about the -valuePatches option, but if this is a boundary condition, why not use groovyBC instead?
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Old   March 17, 2010, 08:57
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Bernhard Gschaider
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Quote:
Originally Posted by lions85 View Post
In this way all the cells are filled with this condition, but i need the condition only in the inlet. So i think I didn't understand very well the -valuePatches option.
Rerun FSF with the -keepPatches-option and "clear" the field. See http://openfoamwiki.net/index.php/Co...t-Room_Example
Quote:
Originally Posted by lions85 View Post
I have a question more: I want the condition for every time step: how i can set this?
A fixedValue is not changed during the simulation. So if you set the patch at 0 it will keep that value. If your BC is transient then have a look at groovyBC as suggested in the other posting

Bernhard
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