# Boundery plane definition

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November 3, 2019, 14:03
Boundery plane definition
#1
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FHydro
Join Date: Jan 2013
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Hello. I have a question about a geometry shown in image below. I will be grateful if you help me.

As you can see there is a part that is out of main model (the part that is signed with A and B). What would happen if I define the boundary plane on the A and B? I imagine If I define the plane that crosses from A and B, there will be extra grids between AB and CD wall (the space that there is no need to be simulated). Furthermore, the upstream boundary I think will face another problem as its length will increase when the side boundary (AB) is out of model.
I hope I could explain those problems.

Thanks
Attached Images
 Untitled1.jpg (19.9 KB, 15 views)

Last edited by flow_CH; November 4, 2019 at 10:42.

November 19, 2019, 11:45
#2
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Quote:
 Originally Posted by flow_CH Hello. I have a question about a geometry shown in image below. I will be grateful if you help me. As you can see there is a part that is out of main model (the part that is signed with A and B). What would happen if I define the boundary plane on the A and B? I imagine If I define the plane that crosses from A and B, there will be extra grids between AB and CD wall (the space that there is no need to be simulated). Furthermore, the upstream boundary I think will face another problem as its length will increase when the side boundary (AB) is out of model. I hope I could explain those problems. Thanks
Use multiple mesh blocks to capture only the geometry that matters.

November 25, 2019, 14:55
#3
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FHydro
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Quote:
 Originally Posted by thunde47 Use multiple mesh blocks to capture only the geometry that matters.

I am a beginner in Flow 3d. The plan view of the model has been attached.

I want to define a boundary for red segment (red square in image - Air shaft) as well as green one. The green line is inclined related to model. The yellow one is in flow direction.
Can I define red and inclined green boundaries in flow 3d? As I have seen, the shape of meshing in flow 3d is like a cube which requires same length of inflow and outflow boundary but in my case those are not equal in length as you can see from the image.
Attached Images
 uu.jpg (31.9 KB, 11 views)