# How to get a particular plane in CFD-Post?

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 April 2, 2014, 23:06 How to get a particular plane in CFD-Post? #1 Member   JESS Join Date: Nov 2010 Posts: 31 Rep Power: 7 Hi, all. I want to get a circular region in CFD-Post and the equation is x^2+y^2<=1 && Z=1. I insert a plane Z=1, but this region is too big. I just want to display the circular region. How to do this ? Thanks.

April 3, 2014, 01:09
#2
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Quote:
 Originally Posted by Raijin Thunderkeg Hi, all. I want to get a circular region in CFD-Post and the equation is x^2+y^2<=1 && Z=1. I insert a plane Z=1, but this region is too big. I just want to display the circular region. How to do this ? Thanks.
1. Insert plane.
2. Definition -> Method = XY Plane
3. Plane Bounds -> Type = Circular
4. Plane Bounds -> Radius = 1

Z is not radius but distance between coordinate system XY plane and your plane. Also note that by default plane type is "slice", so you'll see only intersection with your geometry. If you want to see full cyrcle then set plane type to "sample".

 April 3, 2014, 01:14 #3 Senior Member   Bharath kumar Join Date: Apr 2009 Posts: 168 Rep Power: 9 You can go to turbo mode in CFD post and intialise Rotational axis by setting axis definition then you will get Radius as variable. With this Radius as variable you can use Surface of revolution for circular plane.

April 3, 2014, 02:19
#4
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JESS
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Quote:
 Originally Posted by Antanas 1. Insert plane. 2. Definition -> Method = XY Plane 3. Plane Bounds -> Type = Circular 4. Plane Bounds -> Radius = 1 Z is not radius but distance between coordinate system XY plane and your plane. Also note that by default plane type is "slice", so you'll see only intersection with your geometry. If you want to see full cyrcle then set plane type to "sample".
Thanks for your reply. If this circle is eccentric, this method doesn't work.

 April 3, 2014, 02:24 #5 Member   JESS Join Date: Nov 2010 Posts: 31 Rep Power: 7 Thanks. I will try what you said.

April 3, 2014, 04:06
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Quote:
 Originally Posted by Raijin Thunderkeg Thanks for your reply. If this circle is eccentric, this method doesn't work.
You then may insert "User Surface" with "method" = "offset from surface", "type" = "translational" and define direction and distance. This will give you circle which center is shifted from the origin of coordinates.

 April 3, 2014, 06:30 #7 Super Moderator   Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 12,638 Rep Power: 98 You can define any shape you can define analytically by defining a variable as function of x,y and z; and then doing a user surface of a contour plot of it. For instance, if you define a variable as r = sqrt(x^2+y^2), then you can draw a contour at any radius you like and make it into a user surface. Likewise you can extend this to ellipses, parabolas or anything else you can define analytically. Raijin Thunderkeg and hwangpo like this.

April 3, 2014, 21:39
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JESS
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Quote:
 Originally Posted by ghorrocks You can define any shape you can define analytically by defining a variable as function of x,y and z; and then doing a user surface of a contour plot of it. For instance, if you define a variable as r = sqrt(x^2+y^2), then you can draw a contour at any radius you like and make it into a user surface. Likewise you can extend this to ellipses, parabolas or anything else you can define analytically.
This is awesome. Thank you.

 January 31, 2015, 14:25 ANSYS help #9 New Member   Join Date: Sep 2014 Posts: 5 Rep Power: 4 Can I select a specific Region? Can I vary the plane size? I want a very small plane at a specific location. I have a box let say 1m x1m x10m. I want a plane at 0.2 x 0.2 and 5m in the z axis of that box. How is that possible? Awaiting reply Thanks.

 January 31, 2015, 17:42 #10 Super Moderator   Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 12,638 Rep Power: 98 You can define arbitrary shapes using limits on planes, or using contours. For instance the contour between x=1 and x=2 will be a strip 1m wide.

January 31, 2015, 23:58
Help!!
#11
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Hassan Iftekhar
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I am having the same issue. I could not shift the plane

Could you explain further
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February 1, 2015, 15:01
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Quote:
 Originally Posted by ghorrocks You can define arbitrary shapes using limits on planes, or using contours. For instance the contour between x=1 and x=2 will be a strip 1m wide.

 February 1, 2015, 18:48 #13 Super Moderator   Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 12,638 Rep Power: 98 You are seeing the elements which lie wholly within the plane. That is why it is jagged.

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