Air flow and heat transfer in Room with server

- April 24, 2022 at 3:08 pm
  skydownunder
  Subscriber
  Hi, I am new to Ansys and was trying to simulate a air circulation and heat transfer within a server room. I have details on
  a. Room Inlet air flow velocity and temp
  b. Rack inlet air flow velocity
  c. Rack outlet airflow velocity and change in temp (Tin server +20.3C from study)
  d. Room outlet Airflow
  Question:
  On the setup part, I noticed that the outlet BC has been assigned as pressure outlet instead of velocity outlet. How can I change it to velocity outlet? If not, how can I link the velocity outlet with pressure outlet? Same is true from the room outlet (assigned as pressure outlet)
  Is there a way to know temperature change from room inlet temp to rack inlet temp? and link the temp from rack inlet to rack outlet?
- April 25, 2022 at 1:32 pm
  
  RK
  Ansys Employee
  
  Hello,
  There is no outlet velocity BC. Please see this section for the list of boundary conditions : 7.4. Boundary Conditions (ansys.com)
  You can setup a report definition at the 2 locations and compute the difference.
- May 17, 2022 at 10:23 am
  
  skydownunder
  Subscriber
  
  Continuing I have below setup, the T server outlet is link to the T server inlet. is it possible to have an equation to link both temperatures?
- May 17, 2022 at 1:54 pm
  
  Rob
  Forum Moderator
  
  Have a look at expressions, otherwise you need a UDF. You can use a negative velocity to s-u-c-k flow into the rack & then blow it out again. Note, mass may (won't) be conserved if the density is temperature dependent.
  Edit - bypassing the naughty word filter isn't recommended, but given it's easier to upset than my Great Aunt I'm going to let myself off....
- May 17, 2022 at 2:38 pm
  
  skydownunder
  Subscriber
  
  thanks, will try to look up for expressions

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