Coordinate system definition in porous zones
Hi,
I'm new with openFOAM and cfd :). As assignment for a university course, I should simulate a DOC-DPF system (teacher gave me a tutorial). I have set the porous zone in that way: porosity1 { type DarcyForchheimer; active yes; cellZone catZoneCells; DarcyForchheimerCoeffs { d d [0 -2 0 0 0 0 0] (2e8 1e8 1e8); f f [0 -1 0 0 0 0 0] (0 0 0); coordinateSystem { e1 (0.866 0.5 0); // asse cilindro e2 (0 0 1); // ortogonale a e1 } } } I did not completely understand the meaning of e1 and e2. I think these unitary vectors are the local coordinate system of the zone, but how can I set the origin of the system? What is the kind of relation they have with the global system? Thanks to all! Best regards, Matteo. |
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Thank you, |
Hello everyone,
Guys Please help me with the how to set the origin, e1, e2, and e3. |
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e1 is the direction in which the first entry of the "d" and "f" vectors are acting. So in direction e1 d is 2e8, in direction e2 it is 1e8 and in direction e3 (which is perpendicular to the plane defined by e1 and e2) we also have 1e8. The Forchheimer coefficients are 0 in all directions. The current setup means that there is more resistance in the e1 direction than in the other directions. Hope this helps. Regards, Tom |
Hello Tom,
Thank you very much for your quick reply and suggestion, the Chalmers University material by Haukur Elvar Hafsteinsson will give a brief details about how to setup and used in OpenFOAM. The link for the material given below http://www.tfd.chalmers.se/~hani/kur...ukurReport.pdf |
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