Problem with Constrained Plane

Romarius · February 25, 2015, 17:47

Hello,

I am trying to get the averaged velocity in an axisymetrical nozzle inner section and for that, I created a 2D mesh and a constrained plane spaped to it. But the result shows 0 velocity on the constrained plane and that I looked up in the help and I found that to use a constrained plane, a volumic mesh is necessary.

But what I need is a 2D axisymetrical mesh and that confused me alot. Anyone can help me please? Thanks!

Jishen

me3840 · March 4, 2015, 22:17

I'm really confused as to what you're trying to do. If you have a 2D mesh, that mesh is already a plane. Why do you want to make a plane from that plane?

fluid23 · March 5, 2015, 10:55

Unless you are using the very latest version of Star-CCM+, it doesn't have a 2D mesh option. The volume mesh is basically your 2D geometry extruded so that it has a thickness, then the constrained plane cuts through the voume mesh and extracts a their 2D mesh.

However, that changed with v9.06.009 or maybe v10.

ggulgulia · March 6, 2015, 05:41

Hi Romarius

more over constrained planes are better to visualize the scalar or vector plots or get values where the flow enters a new zone and you don't have an interface to get the values.

A constrained plane hanging in the middle of a volume (or surface in your case) continua will not yield conservative values.

February 25, 2015, 17:47	Problem with Constrained Plane	#1
Romarius New Member Jishen Zhang Join Date: Jun 2014 Location: Vigo, Spain Posts: 12 Rep Power: 12	Hello, I am trying to get the averaged velocity in an axisymetrical nozzle inner section and for that, I created a 2D mesh and a constrained plane spaped to it. But the result shows 0 velocity on the constrained plane and that I looked up in the help and I found that to use a constrained plane, a volumic mesh is necessary. But what I need is a 2D axisymetrical mesh and that confused me alot. Anyone can help me please? Thanks! Jishen

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March 4, 2015, 22:17		#2
me3840 Senior Member Join Date: Nov 2010 Location: USA Posts: 1,232 Rep Power: 25	I'm really confused as to what you're trying to do. If you have a 2D mesh, that mesh is already a plane. Why do you want to make a plane from that plane?

March 5, 2015, 10:55		#3
fluid23 Senior Member Matt Join Date: Aug 2014 Posts: 947 Rep Power: 18	Unless you are using the very latest version of Star-CCM+, it doesn't have a 2D mesh option. The volume mesh is basically your 2D geometry extruded so that it has a thickness, then the constrained plane cuts through the voume mesh and extracts a their 2D mesh. However, that changed with v9.06.009 or maybe v10.

March 6, 2015, 05:41		#4
ggulgulia Senior Member Gajendra Gulgulia Join Date: Apr 2013 Location: Munich Posts: 144 Rep Power: 13	Hi Romarius more over constrained planes are better to visualize the scalar or vector plots or get values where the flow enters a new zone and you don't have an interface to get the values. A constrained plane hanging in the middle of a volume (or surface in your case) continua will not yield conservative values.