Creating a fan

theHumbleOne · November 26, 2014, 11:36

Hello,

I have a quite basic question I asked in another topic and decided to start a new, short (hopefully) topic.

I wanted to create a flat fan from a surface 'hanging' in the middle of a 3D fluid body (box). Now I know that in 3D simulations Fluent doesn't see 2D bodies and therefore the fan has to be created from body. So I need to create a fan-body inside a box-body.
What this fan-body should be like? I guess fluid (right?), but where should I apply a 'fan' BC (e.g. if it is a cylinder - interior or one of the walls)?
If it is fluid, I encounter another problem - without uniting/adding materials of the bodies, fluid in a Fluent symulation won't flow between them.

I know these are basics, but I can't learn anything helpful from manuals or forums.

theHumbleOne · December 5, 2014, 07:16

I stopped "body approach" because in the meantime I found out how to transfer surfaces to Fluent.
In Fluent 15.0 there is a kind of a bug. In ANSYS Meshing -> Mesh -> Details of Mesh -> Advanced you have to change Element Midside Nodes from "dropped" to "program controlled".

The only problem is that surfaces appearing in Fluent are counted as one body called "baffle" (named selectons given in DesignModeler are suppressed in Mesher -> in Mesher you can't select this geometry -> finally, it appears in Fluent as described). So it looks to me that you can't give various BCs to each of them. For me it's not a problem, therefore i don't examine it any more.

PS I'm not sure, but had an impression, that in this approach joining bodies in one part was crucial.

November 26, 2014, 11:36	Creating a fan	#1
theHumbleOne New Member Michał Join Date: May 2014 Posts: 12 Rep Power: 12	Hello, I have a quite basic question I asked in another topic and decided to start a new, short (hopefully) topic. I wanted to create a flat fan from a surface 'hanging' in the middle of a 3D fluid body (box). Now I know that in 3D simulations Fluent doesn't see 2D bodies and therefore the fan has to be created from body. So I need to create a fan-body inside a box-body. What this fan-body should be like? I guess fluid (right?), but where should I apply a 'fan' BC (e.g. if it is a cylinder - interior or one of the walls)? If it is fluid, I encounter another problem - without uniting/adding materials of the bodies, fluid in a Fluent symulation won't flow between them. I know these are basics, but I can't learn anything helpful from manuals or forums.

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
Possible Bug in pimpleFoam (or createPatch) (or fluent3DMeshToFoam)	cfdonline2mohsen	OpenFOAM	3	October 21, 2013 10:28
Simulation of Axial Fan Flow using A Momentum Source Subdomain	Liam	CFX	28	July 16, 2013 09:24
fan driven flow, Fan BC validation (getting lost)	soonic	OpenFOAM Running, Solving & CFD	0	July 7, 2013 20:16
Considering the operating point instead of the fan curve	saisanthoshm88	CFX	8	August 9, 2012 07:57
Problem in running ICEM grid in Openfoam	Tarak	OpenFOAM	6	September 9, 2011 18:51

December 5, 2014, 07:16		#2
theHumbleOne New Member Michał Join Date: May 2014 Posts: 12 Rep Power: 12	I stopped "body approach" because in the meantime I found out how to transfer surfaces to Fluent. In Fluent 15.0 there is a kind of a bug. In ANSYS Meshing -> Mesh -> Details of Mesh -> Advanced you have to change Element Midside Nodes from "dropped" to "program controlled". The only problem is that surfaces appearing in Fluent are counted as one body called "baffle" (named selectons given in DesignModeler are suppressed in Mesher -> in Mesher you can't select this geometry -> finally, it appears in Fluent as described). So it looks to me that you can't give various BCs to each of them. For me it's not a problem, therefore i don't examine it any more. PS I'm not sure, but had an impression, that in this approach joining bodies in one part was crucial.