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October 16, 2017, 05:52 |
Inserting a Cavity
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#1 |
New Member
Michael Hopfinger
Join Date: Mar 2017
Posts: 14
Rep Power: 9 |
Hello,
I try to simulate the mass flow within a shroud cavity that is infront and after my stator blade. Therefore, I need to connect my hub with the cavity domain somehow. Unfortunately, I don't know how to implemet an interface between this specific hub region and my cavity as the mesh simply has a single hub domain. Please check my attachment. In other words: I want to tell CFX that there are two openings on the hub where mass is streaming in/out. Is a user surface an option? |
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October 16, 2017, 06:28 |
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#2 |
Super Moderator
Glenn Horrocks
Join Date: Mar 2009
Location: Sydney, Australia
Posts: 17,665
Rep Power: 143 |
I do not understand your question. Please post a labelled image showing where the fluid paths are, where the inlets and outlets are and the cavities you are trying to model.
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October 16, 2017, 07:42 |
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#3 |
New Member
Michael Hopfinger
Join Date: Mar 2017
Posts: 14
Rep Power: 9 |
Hey,
thank you for dealing with my problem. Sorry, I was afraid that I didn't describe the situation properly. Basically, I want to simulate the mass flow through my stator cavity. So, I need to link the mesh of my cavity domain to my main channel. In CFX Pre, I merely can assign the entire hub as a "Wall" but I need to tell CFX that there is a linkage to the cavity where the fluid is going in/out. In the picture, I labelled the various domains. I hope it becomes clearer now. |
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October 16, 2017, 08:05 |
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#4 |
Super Moderator
Glenn Horrocks
Join Date: Mar 2009
Location: Sydney, Australia
Posts: 17,665
Rep Power: 143 |
You need to make sure the interface between the cavity and the channel is one surface and the walls are another surface. Then you simply need to define a GGI to link the cavity and channel and the other surfaces will be walls.
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October 16, 2017, 08:16 |
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#5 |
New Member
Michael Hopfinger
Join Date: Mar 2017
Posts: 14
Rep Power: 9 |
Ok, so the specific surfaces need to be generated during the mesh generation, right? I was hoping there was any other solution in CFX-Pre
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October 16, 2017, 19:19 |
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#6 |
Super Moderator
Glenn Horrocks
Join Date: Mar 2009
Location: Sydney, Australia
Posts: 17,665
Rep Power: 143 |
Recent versions of CFX-Pre show the component surfaces of some meshes. Then you won't need to remesh. But this is only available in recent versions of CFX (from about V17 I think) and only works for meshes generated by some software.
But if you remesh and make the surfaces different named groups then it is easy to assign different boundary/interface conditions onto them. |
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