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Zbynžk May 24, 2002 05:48

Inflation CFX-5.5
Dear CFX users, is it possible to create inflation layers inside the domain without any BC? I'm trying to simulate flat water jet. I want to use inflation within jet. But there is no fluid boundary there, so I can not locate it. As well locating by "thin surface" and subdomain is not suitable because then there is wall BC in jet. Thanks,


Neale May 24, 2002 10:07

Re: Inflation CFX-5.5
Hmm, I don't think there is a way around this. Is your geometry simple enough to make a hex mesh using the patran mesher instead of the default?


Sharks May 26, 2002 13:42

Re: Inflation CFX-5.5

You can create a subdomain in CFX-5 (i.e. without specifying sources), and inflate from it using the 'Surfaces' option under Create>Inflated Boundary. No BC is required, and no BC is generated during the inflation. Is this what you require ?


steve May 26, 2002 17:02

Re: Inflation CFX-5.5
You need the latest patch to do this though.

stuart May 27, 2002 05:40

Re: Inflation CFX-5.5
If your geometry is simple enough, you could devide it into 2 sections along the centre line of the jet. Create two separate solids from the 2 sections and specify both of these int he domains form. At the junction between the solids you may be able to inflate from those surfaces. I'd check it out on a simple box first. alternatively If the geom's simple enough use the hex mesh approach Neale suggested.

Zbynžk May 27, 2002 05:50

Re: Inflation CFX-5.5
Thank you for your answers.

Neale:It will take me much more time to create proper mesh.But it is possible solution. Sharks:If I utilize your approach, I always get message "No surfaces to be inflated!".Is it coused by missing patch? Steve:I will install it immediately,It will help me I hope. Stuart:It seems interesting,thanks.

Joel May 29, 2002 18:05

Re: Inflation CFX-5.5
Instead of using inflation. Just start with a good quality mesh and turn on mesh adaption in the solver control panel. Adapting to velocity will cause the mesh to be refined at the edge of the jet.

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