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Old   August 20, 2013, 09:29
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mohsen kh
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Hi dear friends

I have some problems with my case.I want to model a furnace as a porous medium with constant porosity of 0.5,so I modeled my case with Gambit and import it to OF using "fluent3dtofoam".then, I decided to modify my porous domain so I used "setSet"
I did these things in terminal
1. I define "porous.setSet" file and box (min X min Y min Z)(max X max Y max Z).


2. setSet -batch porous.setSet

3. setsToZones

4. finally I used my solver "myPorousSimpleFoam"

but it seems something is wrong with my simulation.I also don't know how to set porosity equal to 0.5 in "porosityproperties" file in constant folder.I'm not sure I set "e1" and "e2" properly.I look forward for your useful replies.
Attached Images
File Type: jpg Gambit_ImageFile1.jpg (11.6 KB, 9 views)
File Type: jpg Gambit_ImageFile2.jpg (36.4 KB, 13 views)
File Type: jpg Gambit_ImageFile4.jpg (55.8 KB, 10 views)
File Type: jpg 2.jpg (22.9 KB, 9 views)
File Type: jpg 1.jpg (22.2 KB, 8 views)
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Old   August 21, 2013, 13:35
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Goncalo Pedro
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Hard to tell what you mean by "something is wrong with my simulation".

e1 and e2 are the axis directions that define the coordinate system local to your porous media. Seems from the images that you should be able to align them to the cartesian coordinate system ((1 0 0) and (0 1 0)) for example) and set your coefficients in relation to that.

You need to set the Darcy Forcheimer coefficients that are applicable to your material. I suggest digging into some literature to find that.

Take a look at the angledDuct tutorials (porousSimpleFoam) for some help.

Goncalo
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Old   August 25, 2013, 07:06
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mohsen kh
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Quote:
Originally Posted by gonpe View Post
Hard to tell what you mean by "something is wrong with my simulation".

e1 and e2 are the axis directions that define the coordinate system local to your porous media. Seems from the images that you should be able to align them to the cartesian coordinate system ((1 0 0) and (0 1 0)) for example) and set your coefficients in relation to that.

You need to set the Darcy Forcheimer coefficients that are applicable to your material. I suggest digging into some literature to find that.

Take a look at the angledDuct tutorials (porousSimpleFoam) for some help.

Goncalo

Hi dear Goncalo
I want to know how should I set porosity of 0.5 for my case and what I should do to find a,b which are used for alpha and beta to define D and f in my porosityProperties file in my constant folder.
please see this thread
http://www.cfd-online.com/Forums/ope...ous-zones.html
where can I found these coefficients for sponge iron
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Old   August 27, 2013, 18:31
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Goncalo Pedro
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Hi Mohsen

I've never tried to find porous media coefficients for that type of material, so can't help you on that specific point.

I typically find basic porous media info in engineering handbooks (simple weaves etc.). I haven't come across pig iron yet

I suspect you will need to do some digging into papers and material handbooks.

Sorry can't help you any more than that!

Goncalo
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