# planar vorticity calculation

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 October 7, 2010, 07:33 planar vorticity calculation #1 New Member   harry Join Date: May 2009 Posts: 29 Rep Power: 10 Hi all, I'm working on a secondary flow induced mixing in a T-shape channel. I'm interested in calculating the cross sectional or transversal directional planar vorticity which I believe can lead to the secondary flow pattern. However, the channel is not straight, zigzag shape instead. The difficulty is how to obtain the planar vorticity value on a certain cross sectional plane which is not parallel to any axis, i.e, x, y or z direction. I can't find any solution in CFX POST so far. Could anyone share me some advice plz? thanks. Harry

October 7, 2010, 14:38
#2
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Michael P. Owen
Join Date: Mar 2009
Posts: 196
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Quote:
 Originally Posted by rystokes Hi all, I'm working on a secondary flow induced mixing in a T-shape channel. I'm interested in calculating the cross sectional or transversal directional planar vorticity which I believe can lead to the secondary flow pattern. However, the channel is not straight, zigzag shape instead. The difficulty is how to obtain the planar vorticity value on a certain cross sectional plane which is not parallel to any axis, i.e, x, y or z direction. I can't find any solution in CFX POST so far. Could anyone share me some advice plz? thanks. Harry
Just do the math. Transform to find the vorticity component normal to the plane, square its magnitude, subtract that from the square of the full vorticity magnitude (which is independent of coordinate system), and take the square root.

 October 8, 2010, 03:36 #3 New Member   harry Join Date: May 2009 Posts: 29 Rep Power: 10 Hi, I used function calculator in POST to obtain the value. Do you know how to get the normal component of vorticity？I established a vector normal to the plane, but I still don't know how to make use of this vector to get the normal component. Thanks.

October 12, 2010, 15:34
#4
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Michael P. Owen
Join Date: Mar 2009
Posts: 196
Rep Power: 10
Quote:
 Originally Posted by rystokes Hi, I used function calculator in POST to obtain the value. Do you know how to get the normal component of vorticity？I established a vector normal to the plane, but I still don't know how to make use of this vector to get the normal component. Thanks.
Again, just do the math. Just project the vector vorticity onto the plane normal, i.e. calculate the dot product of the vorticity vector and the plane normal.

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