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Inserting a momentumsource in CFX 18.0

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Old   May 3, 2018, 08:46
Default Inserting a momentumsource in CFX 18.0
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Maria Carvalho
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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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Old   May 3, 2018, 16:48
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Gert-Jan
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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?
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Old   May 3, 2018, 16:56
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Opaque will become famous soon enough
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 ?
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Old   May 3, 2018, 17:04
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Gert-Jan
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Yes Opaque is right. You should create a small volume as Subdomain. That will provide a momentum source.
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