How to create solid-fluid interface in CFX?

Hamda · August 6, 2018, 07:24

Hi,
I need to define an interface between solid (spheres) and Fluid (the space between spheres). I was wondering if I should return to the first stage, Geometry creating or meshing to define solid-fluid interface or I can create it at the current stage (CFX)?
Many thanks

cfd seeker · August 6, 2018, 07:31

The patches/surfaces which needs to be defined as Interfaces should be defined as separate parts or surfaces. Then in CFX it would be easy to identify those patches/surfaces and set them as interfaces. Like it would be easy to identify them with their names in CFX-pre.

Regards

Hamda · August 6, 2018, 08:01

Thanks
you mean that I should define the common surface by using name selection? But when I want to save it I got error! should I mesh it separately?

cfd seeker · August 6, 2018, 08:19

I do the meshing in ICEM CFD. But you have to name the common surfaces as some logical names in the geometry module so that you can define them interfaces in CFX-pre.

Hamda · August 6, 2018, 11:29

Thanks. But as you see in geometry section, I have 2 parts, solid and fluid that are separated from each other. I don't know it is correct or not but I was told that if you want CFX itself creates the interface you should unite these fluid and solid and indeed in geometry section I have just one geometry. I don't know it is correct or not. What is your idea? I asked my questions in different sites and got different answers and so it makes me confused!
By the way, I will try that.
Thanks

cfd seeker · August 6, 2018, 11:42

I haven't dealt with interfaces since long, so I kind of forgot it how I was doing it. I am kind of guessing it, just give it a try.

Combine the solid and fluid parts in Design Modeler and then at the joining interface/face you will get a single surface. In CFX-pre define this surface/face as Fluid-Solid interface.

August 6, 2018, 07:31		#2
cfd seeker Senior Member Join Date: Mar 2011 Location: Germany Posts: 552 Rep Power: 20	The patches/surfaces which needs to be defined as Interfaces should be defined as separate parts or surfaces. Then in CFX it would be easy to identify those patches/surfaces and set them as interfaces. Like it would be easy to identify them with their names in CFX-pre. Regards Hamda likes this.

August 6, 2018, 08:19		#4
cfd seeker Senior Member Join Date: Mar 2011 Location: Germany Posts: 552 Rep Power: 20	I do the meshing in ICEM CFD. But you have to name the common surfaces as some logical names in the geometry module so that you can define them interfaces in CFX-pre. Hamda likes this.

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August 6, 2018, 11:29		#5
Hamda Member Hamda Join Date: Jul 2018 Posts: 80 Rep Power: 8	Thanks. But as you see in geometry section, I have 2 parts, solid and fluid that are separated from each other. I don't know it is correct or not but I was told that if you want CFX itself creates the interface you should unite these fluid and solid and indeed in geometry section I have just one geometry. I don't know it is correct or not. What is your idea? I asked my questions in different sites and got different answers and so it makes me confused! By the way, I will try that. Thanks

August 6, 2018, 11:42		#6
cfd seeker Senior Member Join Date: Mar 2011 Location: Germany Posts: 552 Rep Power: 20	I haven't dealt with interfaces since long, so I kind of forgot it how I was doing it. I am kind of guessing it, just give it a try. Combine the solid and fluid parts in Design Modeler and then at the joining interface/face you will get a single surface. In CFX-pre define this surface/face as Fluid-Solid interface.