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Old   July 2, 2001, 09:17
Default CFX4 2d geometry
  #1
sanjib das sharma
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Hi, I am a new user of CFX4.I am having problems to create simple 2-D geometries like parallel plates,axisymmetric pipe,circular cylinder etc.I am a bit confused about CFX-Build and CFX-Meshbuild.I have read the manuals carefully,but cannot figure out.Please help me on this regard. Thanks Sanjib.
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Old   July 2, 2001, 15:00
Default Re: CFX4 2d geometry
  #2
Jan Rusås
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Dear Sanjib,

Create a surface in i.e. the x-y plane, create a solid by extruding this surface in the z direction, extrude by say 1.

For axisymmetric the low-j should be a symmetry plane.

Create the mesh and REMEMBER only one cell in the z-direction for 2d geometries.

If you are using build and want to create an axisymmetric geometry, remember in the analyse to activate the slab=wedge.

From mesh-build I think for creating axisymmetric geometry you should convert the geometry in mesh import where there is an option for axi-symmetry.

Hope it helps,

Regards Jan

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Old   July 3, 2001, 00:47
Default Re: CFX4 2d geometry
  #3
sanjib das sharma
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Dear Jan, Thanks a lot for the suggestions. Regards, Sanjib.
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Old   July 3, 2001, 01:18
Default Re: CFX4 2d geometry
  #4
sanjib das sharma
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Dear Jan, can you expalin the main difference between CFX-Build and CFX Meshbuild? Regards, Sanjib
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Old   July 4, 2001, 06:08
Default Re: CFX4 2d geometry
  #5
sanjib das sharma
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Hi, Can anyone please tell me how to run CFX-Meshbuild i.e,how to get into that environment and start building geometries?I am new to this software and facing a lot of difficulties.I can run the CFX-Build,but it seems to be good for 3D geometries. Regards, Sanjib
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Old   July 4, 2001, 15:50
Default Re: CFX4 2d geometry
  #6
P.Fonteijn
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What kind of system are you working on? Winnt? Unix?

You don't need Meshbuild. It is a little old fashioned. Build can do it all (well, almost everything).

Cheers
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Old   July 5, 2001, 00:56
Default Re: CFX4 2d geometry
  #7
sanjib das sharma
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Hi Fonteijn, The system is Unix.Can u please give me hints on how to build a parallel plate geometry and a vertical axisymmetric pipe.I've tried a lot,but as I'm completely new to this,I'm not able to do it. thanks for your reply Regards, sanjib
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Old   July 5, 2001, 02:58
Default Re: CFX4 2d geometry
  #8
Gert-Jan van der Gulik
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Meshbuild?

From the environment menu go to

>>Pre-process
:>Other pre-processing
:>CFX-meshbuild

That's not hard to find.

Building a 2D-geometry?

- Give in all free points in the x-y-plane

- Create faces in the x-y-plane

- Extrude the plane to a block in the z-direction

- Create the grid and just use 1 grid cel in y-direction.

- write the grid.

I am sure there is nice example in the manual for a start.

Regs, Gert-Jan van der Gulik
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Old   July 5, 2001, 06:51
Default Re: CFX4 2d geometry;Thanks
  #9
sanjib das sharma
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Hi van der Gulik

Thanks a lot.I've followed your instructions and obtained the geometry.Now I've some idea how things actually work. Regards, Sanjib.
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Old   July 6, 2001, 02:30
Default Re: CFX4 2d geometry
  #10
sanjib das sharma
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Hi, I'm having a difficulty to write a 2d geometry(parallel plates)file.Can anyone sort that out please. Regards, Sanjib.
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Old   July 7, 2001, 05:53
Default Re: CFX4 2d geometry
  #11
Gert-Jan van der Gulik
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Now, what's the problem?
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Old   July 9, 2001, 06:27
Default Re: CFX4 2d geometry
  #12
sanjib das sharma
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Hi, does anyone know how to remove patches from the command line or how to modify a patch? Thanks, Sanjib.
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Old   July 9, 2001, 06:40
Default Re: CFX4 2d geometry
  #13
Matej Forman
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Hi, to modify a patch in command file:

>>MODEL TOPOLOGY

>>MODIFY PATCH

OLD PATCH NAME,NEW PATCH NAME,NEW PATCH TYPE keywords are avalible. If you want to change a location, you can do it through the renaming to new patch,or - specify it either in meshbuild (or Build)and generate+write the mesh again, or in command file, which is more flexible when setting the case.I strongly sudgest to go through introductory examples. it takes you 1 day but saves much more back. good luck! matej
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Old   July 9, 2001, 08:12
Default Re: CFX4 2d geometry
  #14
Jan Rusås
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Don't you have a manual? Many of your questions are very well described in the manual. I know it is difficult to start with a new code, but it is usefull to get familiar with the manual.

Good Luck Jan

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Old   July 9, 2001, 08:18
Default Re: CFX4 2d geometry
  #15
sanjib das sharma
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Hi Jan & Matej, thanks both of you for the suggestions. regards, Sanjib
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Old   July 10, 2001, 04:36
Default Re: CFX4 2d geometry
  #16
bin xia
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hi,Sanjib I am also a beginner of CFX 4.1. Now I am learning CFX-build, but in my manual there is little examples, would you please tell me how many examples in your manual and can you use the on-line maual?

Thanks a lot.

Wish we learn CFX smoothly.

bin xia
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Old   July 10, 2001, 05:56
Default Re: CFX4 2d geometry
  #17
sanjib das sharma
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Hi Bin, There are 5 examples in CFX-BUILD and 14 examples in CFX-MESHBUILD.If you have only CFX-BUILD like me,then you have to access the online manual only.Initially it will be a bit difficult,you need to get accustomed.I am trying to solve some simple 2d problems eg.flow through parallel plates,pipes.I think this approach will be okay. Regards, Sanjib.
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