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September 4, 2025 at 10:05 pm
andrew.m.hayes
Subscriberhi -
I am trying to model air flow starting inside a computer case and exiting through various means. I created an enclosure around the case and did a volume extract using the walls of the enclosure. That seemed to work, but I am not sure if that was correct. I am also not sure if I am supposed to define the walls of the enclosure as 'symmetry'. My largest hurdle is creating an air input. Currently, I have a line that enters the top and exits in the middle of the case. i can do a volume extract on that line and define the Airin and Airout, but when I do a volume mesh they get lost since the air line is inside the enclosure. Is there a way to define a point source for an air exit?
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September 5, 2025 at 8:19 am
Rob
Forum ModeratorDo you need the "outside" or would domain boundaries on the casing be more suitable? Are you using a forced flow ie fan at one end of the server rack with a few holes or a box with holes and a load of fans like a more common desktop? Are you using Fluent?
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September 5, 2025 at 8:22 am
SRP
Ansys EmployeeHi,
A line has no area, so the mesher will ignore it in a 3D volume mesh. You need a surface for a boundary condition. That’s why your “Airin/Airout” get lost.
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September 5, 2025 at 5:48 pm
andrew.m.hayes
SubscriberI am using an air input inside the computer case, so I 'think' I need the domain outside the computer (the enclosure) case to model the air flow out of the case
When I do a volume extract of the air line I do have two surfaces that I have defined as "in" and "out", but when I do the volume mesh the fluid zones get merged, since both the in and out are inside the enclosure
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