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Old   October 16, 2017, 04:52
Default Inserting a Cavity
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Michael Hopfinger
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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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File Type: jpg meridional_effect.jpg (91.7 KB, 10 views)
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Old   October 16, 2017, 05:28
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Glenn Horrocks
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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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Old   October 16, 2017, 06:42
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Michael Hopfinger
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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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Old   October 16, 2017, 07:05
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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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Old   October 16, 2017, 07:16
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Michael Hopfinger
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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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Old   October 16, 2017, 18:19
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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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