# Wedge (axi-symmetric BC) equation in OpenFOAM

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 August 9, 2016, 23:01 Wedge (axi-symmetric BC) equation in OpenFOAM #1 New Member   Fadhilah Mohd Sakri Join Date: Aug 2016 Posts: 1 Rep Power: 0 Sponsored Links Dear Foamers, I want to know the actual equation for the wedge in OpenFOAM. I appreciated for everybody reply me. Regards; -eypa-

 August 12, 2016, 10:19 #2 Super Moderator     Tobias Holzmann Join Date: Oct 2010 Location: Leoben (Austria) Posts: 1,842 Blog Entries: 6 Rep Power: 32 Hi, the equations we are solving are finally the same. We only use a wedge boundary condition. If you are asking about, the mechanism behind the wedge BC, just check the boundary source file and you will get what it will do. __________________ Keep foaming, Tobias Holzmann

October 10, 2016, 17:06
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Dear Tobi,

Based on the your answer, when we use 5 degree wedge to approximate the 3D axisymmetric geometries, we still save the NS equation in cartersian (x-y-z) system, rather than the cylindrical system (x-theta-r).

I checked the boundary files for wedge boundary but did not see any information about the mechanism for this type of boundary. Could you please see more about this?

cheers,
offo

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I understand that there are two key points if we would like to use the "wedge" BC:
1 - angle < 5 degree
2 - the front and back faces straddle along one coordinate axis (along the radial direction)

Do you know why we need to meet the above reqiurements in order to approximate the axisymmetric with ""wedge"?

Thank you

Quote:
 Originally Posted by Tobi Hi, the equations we are solving are finally the same. We only use a wedge boundary condition. If you are asking about, the mechanism behind the wedge BC, just check the boundary source file and you will get what it will do.

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