Problem of Geo-reconstruction (Picture) -- CFD Online Discussion Forums

April 1, 2015, 20:49	Problem of Geo-reconstruction (Picture)	#1
lovvv New Member Danniel Join Date: Apr 2015 Posts: 1 Rep Power: 0	Hi, guys! I need to use the normal vector of multiphase interface in udf, which equals to the gradient of the volume fraction. I tried both C_VOF_G and C_VOF_RG variables and found they had the same direction. White arrows in the following picture represents the direction of normal vector (both C_VOF_G and C_VOF_RG ). http://imageshack.com/a/img905/3714/0QBvOf.png According to the Young vof model used in fluent, the direction of the center cell should be [2,1], but it turns out to be [1,1] in the result. Could anyone give me some suggestions ? Thanks

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