Inserting a momentumsource in CFX 18.0

mdoracarv · May 3, 2018, 09:46

Hello

,

I am quite new to this community and to CFD; this is may first question. I searched for an specif answer to may question, but could't find any. Here it is: I need to insert a momentum source in the 18.0 version of Ansys. I want to make my simulation as simple as possible and therefore I want to simulate a fan with a point source, as I already simulate a gas leak using a continuity source. The problem is I cannot find this option in CFX Pre. All I get besides continuity is total energy, kinetic energy and turbulence eddy dissipation. Thanks for any help.

Gert-Jan · May 3, 2018, 17:48

When I open Pre, I see an icon in the ribbon, that allows me to specify a Source Point. Left to it there is an icon where you can insert a Subdomain, which can be used to define a volume source.

Isn't that enough? I would think it gives enough possibilities to fullfill your needs, not?

Opaque · May 3, 2018, 17:56

unfortunately, momentum sources are not available for source points.

You may have to isolate the specific element in the mesh (outside CFX-Pre), and then you can select that element as a subdomain.

I do not see an alternative way at the moment. Is the fan that small ?

Gert-Jan · May 3, 2018, 18:04

Yes Opaque is right. You should create a small volume as Subdomain. That will provide a momentum source.

May 3, 2018, 09:46	Inserting a momentumsource in CFX 18.0	#1
mdoracarv New Member Maria Carvalho Join Date: May 2018 Posts: 2 Rep Power: 0	Hello, I am quite new to this community and to CFD; this is may first question. I searched for an specif answer to may question, but could't find any. Here it is: I need to insert a momentum source in the 18.0 version of Ansys. I want to make my simulation as simple as possible and therefore I want to simulate a fan with a point source, as I already simulate a gas leak using a continuity source. The problem is I cannot find this option in CFX Pre. All I get besides continuity is total energy, kinetic energy and turbulence eddy dissipation. Thanks for any help.

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May 3, 2018, 17:48		#2
Gert-Jan Senior Member Gert-Jan Join Date: Oct 2012 Location: Europe Posts: 1,910 Rep Power: 28	When I open Pre, I see an icon in the ribbon, that allows me to specify a Source Point. Left to it there is an icon where you can insert a Subdomain, which can be used to define a volume source. Isn't that enough? I would think it gives enough possibilities to fullfill your needs, not?

May 3, 2018, 17:56		#3
Opaque Senior Member Join Date: Jun 2009 Posts: 1,869 Rep Power: 33	unfortunately, momentum sources are not available for source points. You may have to isolate the specific element in the mesh (outside CFX-Pre), and then you can select that element as a subdomain. I do not see an alternative way at the moment. Is the fan that small ?

May 3, 2018, 18:04		#4
Gert-Jan Senior Member Gert-Jan Join Date: Oct 2012 Location: Europe Posts: 1,910 Rep Power: 28	Yes Opaque is right. You should create a small volume as Subdomain. That will provide a momentum source.