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axisymmetric geometry within engineFoam

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Old   April 13, 2010, 14:21
Default axisymmetric geometry within engineFoam
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Antonella
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hello everyone,

I am a beginner with OpenFoam and specifically I have some problems with the engineFoam.
I'm trying to set up an axi-symmetric geometry in order to simulate (employing the wedge patch type) just a few degrees slice of the combustion chamber instead of the entire cylinder geometry.
The problem I encounter is that the code seems to necessarily require the piston motion to be alligned with the z-axis and at the same time that the symmetry axis (when the wedge patch type is used) must be the x-axis.
This makes impossible to set-up my case, since the symmetry axis (which is, of course, the cylinder axis) and the piston motion direction in the considered geometry should be the same.
Has someone else encountered the same issue? Do you know if any kind of solution has been found?

I would be very grateful of any help you can give me.

Thank you
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Old   April 14, 2010, 13:58
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Quote:
Originally Posted by antonellaP View Post
that the symmetry axis (when the wedge patch type is used) must be the x-axis.
Are you sure? Where did you get this information?
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Old   April 14, 2010, 15:16
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hello, tanks for your reply,

I'm not exactly sure, but, since I was having problems with this geometry, I had a look on the web and on this url: http://openfoamwiki.net/index.php/Si...nical_diffuser

at section 1.6 Case1.3: Case1 as a 2D wedge case
I have read: "This case is similar to Case1, but the simulation is now done in 2D using a wedge geometry (2D radial mesh) and wedge boundary conditions. OpenFOAM requires such geometries to have the symmetry axis along the x-axis, so Case1.3 is transformed to use the x-axis as the main flow direction instead of the z-axis."

Do you have different information or advice? Have you solved similar problems successfully?

Thanks a lot for your help



Last edited by antonellaP; April 14, 2010 at 17:22.
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Old   April 15, 2010, 06:59
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I wasn't aware that wedge cases are that restrictive!?
Any comments from the pros?
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Old   August 30, 2012, 04:55
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Old thread, but worth adding I don't think this is true. See http://www.openfoam.org/docs/user/bo...hp#x24-1390014, figure 5.4 and table 5.1.
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