CFView: Cut plane

MarcoPolo · May 25, 2018, 09:18

Hi there,

I am busy post processing a centrifugal compressor impeller in CFView and would like to create a cut plane at a constant radius in order to evaluate certain quantities there.

I have tried using the 'Create cutting plane' option under the 'Geometry' tab, but could not succeed. I have also consulted the Online Documentation, but could not find anything on how to create specific cut planes.

Any advice or steps to follow in order to create a cut plane at a constant radius ? (The idea is to evaluate properties at the impeller outlet and not the domain outlet)

Blessings
Marco

DarylMusashi · May 25, 2018, 10:10

To create a cutplane of a fixed radius you need to define a new quantity (Quantity - Field Data - Define New Quantity). Call it "r" and define it as "sqrt(x*x+y*y)" if z is the rotational axis.
Now please select this quantity and press SHIFT-I (Representation -> Isosurface) to create an iso-surface. In the bottom line please enter the value of the desired radius.
Finally, please save the iso-surface at Representation -> Iso-Surface Save. In the Surfaces tab in the top left part now you can select this radial cut surface and create contour plots on this surface.

Kind regards
Holger

eng.abdul · February 1, 2019, 04:21

what if we want to use sqrt(x*x+y*y) but not at a constant radius, rather we have a cut plane at a certain angle with z-axis which is an axis of rotation. For example, the hub of some machine is not at a constant radius rather it is profiled one

colinda1 · February 4, 2019, 03:57

You can create such cut plane in the cylindrical view, no?

eng.abdul · February 4, 2019, 13:15

I guess no, let me rephrase the question. for example, if you are working on endwall contouring and you want to see height variation with respect to some reference. if your reference endwall is cylindrical, then you can use this formula sqrt(x*x+y*y) to show the variation. but if the reference is not cylindrical rather a profiled endwall, then how to get the results?

colinda1 · February 5, 2019, 04:05

I am not sure to understand correctly but in that case the meridional view would be of help I guess. There you can make a cut plane at a certain span position and it will follow your profile of hub and shroud.

May 25, 2018, 09:18	CFView: Cut plane	#1
MarcoPolo New Member Marco Join Date: Oct 2017 Posts: 3 Rep Power: 9	Hi there, I am busy post processing a centrifugal compressor impeller in CFView and would like to create a cut plane at a constant radius in order to evaluate certain quantities there. I have tried using the 'Create cutting plane' option under the 'Geometry' tab, but could not succeed. I have also consulted the Online Documentation, but could not find anything on how to create specific cut planes. Any advice or steps to follow in order to create a cut plane at a constant radius ? (The idea is to evaluate properties at the impeller outlet and not the domain outlet) Blessings Marco

May 25, 2018, 10:10		#2
DarylMusashi Senior Member Holger Dietrich Join Date: Apr 2011 Location: Germany Posts: 174 Rep Power: 15	To create a cutplane of a fixed radius you need to define a new quantity (Quantity - Field Data - Define New Quantity). Call it "r" and define it as "sqrt(xx+yy)" if z is the rotational axis. Now please select this quantity and press SHIFT-I (Representation -> Isosurface) to create an iso-surface. In the bottom line please enter the value of the desired radius. Finally, please save the iso-surface at Representation -> Iso-Surface Save. In the Surfaces tab in the top left part now you can select this radial cut surface and create contour plots on this surface. Kind regards Holger eng.abdul and MarcoPolo like this.

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February 1, 2019, 04:21		#3
eng.abdul New Member abdul Join Date: Apr 2017 Posts: 24 Rep Power: 9	what if we want to use sqrt(xx+yy) but not at a constant radius, rather we have a cut plane at a certain angle with z-axis which is an axis of rotation. For example, the hub of some machine is not at a constant radius rather it is profiled one

February 4, 2019, 03:57		#4
colinda1 Senior Member Colinda Join Date: May 2012 Location: Brussels Posts: 153 Rep Power: 14	You can create such cut plane in the cylindrical view, no?

February 4, 2019, 13:15		#5
eng.abdul New Member abdul Join Date: Apr 2017 Posts: 24 Rep Power: 9	I guess no, let me rephrase the question. for example, if you are working on endwall contouring and you want to see height variation with respect to some reference. if your reference endwall is cylindrical, then you can use this formula sqrt(xx+yy) to show the variation. but if the reference is not cylindrical rather a profiled endwall, then how to get the results?

February 5, 2019, 04:05		#6
colinda1 Senior Member Colinda Join Date: May 2012 Location: Brussels Posts: 153 Rep Power: 14	I am not sure to understand correctly but in that case the meridional view would be of help I guess. There you can make a cut plane at a certain span position and it will follow your profile of hub and shroud.