# Modelling cylinder in CFX

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 February 5, 2008, 02:28 Modelling cylinder in CFX #1 Ken Guest   Posts: n/a Hi, Does anyone knows any good examples or tutorials or has any idea on how to model a cylinder using CFX ? I am planning to start with a 2d model first before going to 3d model, is that a good idea? or they are totally different?

 February 5, 2008, 08:27 Re: Modelling cylinder in CFX #2 jakjak Guest   Posts: n/a Can you be more specific? what kind of flow condition you are looking to simulate with a cylinder? e.g. flow inside a cylinder? flow across/along a cylinder??

 February 5, 2008, 19:58 Re: Modelling cylinder in CFX #3 Ken Guest   Posts: n/a i am looking on flow around a cylinder, first with 2d cylinder (which is basically a cylinder) then with a 3d cylinder, which will include free surface effects. Any nice examples or tips on doing these? Will really appreciate if you can help. Thanks

 February 6, 2008, 06:47 Re: Modelling cylinder in CFX #4 Nathan Guest   Posts: n/a Ken one tip - in order to capture unsteady vortex shedding (in 2D) I found it was sometimes necessary to provide a perturbation - e.g. by using a step function in CEL to set up an asymmetric initial condition. Nathan

 February 6, 2008, 12:12 Re: Modelling cylinder in CFX #5 Dre Guest   Posts: n/a If you are interested in vortex shedding, I wasn't able to get any with a turbulent flow. However, laminar works nicely.

 February 6, 2008, 12:36 Re: Modelling cylinder in CFX #6 Nathan Guest   Posts: n/a I've modelled vortex shedding in turbulent flow using the k-epsilon model, if I remember correctly.

 February 12, 2008, 22:02 Re: Modelling cylinder in CFX #7 Ken Guest   Posts: n/a Do you still have the CFX files? Did you do that in 3d? Will really appreciate it if i can have the files by sending them to my email....

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