vorticity contour

mina.p · August 17, 2014, 02:12

Hi
I want to know how can i plot vorticity contour in cfx-post? i can't find vorticity in contour variables?

Opaque · August 18, 2014, 09:49

Did you request the output of the Vorticity variable ?

Alternatively, is the Velocity.Gradient variable available ? In such case, you can compute vorticity using a CEL expression with the Velocity.Gradient components.

mina.p · August 18, 2014, 11:20

yes. Velocity.Gradient is available
thanks

Lance · August 20, 2014, 02:59

Vorticity can be found i cfd-post even if you didnt specify it in the preprocessor. Under 'Derived/Vortex Core' in the variable selector you can choose to plot Velocity.Curl, which is curl of the velocity field.

mina.p · August 21, 2014, 02:50

http://uploads.im/3O6wu.png
http://uploads.im/yAXEV.png
http://uploads.im/xnLBS.png
the pictures are velocity, velocity curl and swirling velocity contours respectively. the swirling is the best one to show vortices but why its color is totally blue??
i want it to be like velocity contour.

Lance · August 21, 2014, 02:52

Change the color range?

August 17, 2014, 02:12	vorticity contour	#1
mina.p New Member mina Join Date: Nov 2013 Posts: 20 Rep Power: 13	Hi I want to know how can i plot vorticity contour in cfx-post? i can't find vorticity in contour variables?

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August 18, 2014, 09:49		#2
Opaque Senior Member Join Date: Jun 2009 Posts: 1,880 Rep Power: 33	Did you request the output of the Vorticity variable ? Alternatively, is the Velocity.Gradient variable available ? In such case, you can compute vorticity using a CEL expression with the Velocity.Gradient components.

August 18, 2014, 11:20		#3
mina.p New Member mina Join Date: Nov 2013 Posts: 20 Rep Power: 13	yes. Velocity.Gradient is available thanks

August 20, 2014, 02:59		#4
Lance Senior Member Lance Join Date: Mar 2009 Posts: 669 Rep Power: 22	Vorticity can be found i cfd-post even if you didnt specify it in the preprocessor. Under 'Derived/Vortex Core' in the variable selector you can choose to plot Velocity.Curl, which is curl of the velocity field.

August 21, 2014, 02:50		#5
mina.p New Member mina Join Date: Nov 2013 Posts: 20 Rep Power: 13	http://uploads.im/3O6wu.png http://uploads.im/yAXEV.png http://uploads.im/xnLBS.png the pictures are velocity, velocity curl and swirling velocity contours respectively. the swirling is the best one to show vortices but why its color is totally blue?? i want it to be like velocity contour.

August 21, 2014, 02:52		#6
Lance Senior Member Lance Join Date: Mar 2009 Posts: 669 Rep Power: 22	Change the color range?