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How to quickly tilt objects and see the flow? |
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#1 |
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Join Date: Oct 2015
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Hi,
I am trying to model airflow over a coil. I would like to see the airflow patterns at varying tilts of the coil. How do I do this? |
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#2 |
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Glenn Horrocks
Join Date: Mar 2009
Location: Sydney, Australia
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This sounds like a basic CFD task. This is well covered by the tutorials provided with your meshing software and CFX.
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#3 |
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Join Date: Oct 2015
Posts: 56
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Is this a CFD or a Geometry task?
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#4 |
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Join Date: Oct 2015
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I guess I wasnt too clear. I am looking to Parametrize the angle that I rotate this coil against the airflow mass exiting.
Just not too sure on how exactly to link them together. |
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#5 |
Super Moderator
Glenn Horrocks
Join Date: Mar 2009
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There are plenty of tutorials in ANSYS Workbench which show how to use parameters as well.
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#6 |
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Join Date: Oct 2015
Posts: 56
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So I have a coil, and I made an enclosure.
I do a Boolean Subtract to subtract the coil out of the box (I preserve bodies though). I create 2 domains. Porous for the coil and fluid for the air. BCs on the enclosure walls - 1 mass flow inlet and 1 p=0 outlet Why am I getting a negative element size error? Thanks. |
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#7 |
Super Moderator
Glenn Horrocks
Join Date: Mar 2009
Location: Sydney, Australia
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FAQ: http://www.cfd-online.com/Wiki/Ansys..._went_wrong.3F
Or if you get this error and you are not doing an FSI simulation then you have a severe problem with your mesh. Use the tools in your meshing software to mesh the domain properly. |
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#8 |
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Join Date: Oct 2015
Posts: 56
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Glenn, thanks - got past that error by adding some mesh controls. But after getting crappy results I am beginning to question my overarching strategy.
Need to go over my plan to simulate a condenser coil with refrigerant running through it (to heat air passing over/through it) using CFX. I want to model the coil as a rectangular plate - porous domain (actual geometry is wayyy to complex to model). Then, place an enclosure - fluid domain (air). Have a BC with air inlet on one side face of enclosure using a mass flow rate and leaving through the other side face with avg static pressure of 0. However, I also want to model heat transfer. When I generate the porous domain, I am not sure how to have it be at a certain temperature so it exchanges heat with the air above it. I want the refrigerant running through the porous domain be at say 140 deg fahrenheit. And the air I will at the inlet face at around 70 deg fahrenheit. I get all blue lines for velocity and temperature (no heat exchanged) all over (crappy results) - Should I manually place walls on my coil/porous domain? Btw, do wall BCs on porous domains mean fully solid faces or are they still porous? |
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#9 |
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Help? Anybody?
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