Modelling Natural Convection problem involving a large temperature difference (about 120 K)

- April 23, 2018 at 1:57 pm
  
  asharma
  Subscriber
  
  Hi,
  
  As per the official Fluent guide, "The Boussinesq model should not be used if the temperature differences in the domain are large.". Does this hold true for AIM as well? If yes, then my question is how to go about modelling a large temperature difference (120 K) natural convection problem in AIM? Like Fluent, I did not see any options (piecewise-linear, piecewise-polynomial, or polynomial) to define a temperature dependent density.
  
  Any insights appreciated, thank you !
- April 24, 2018 at 6:26 am
  
  Naresh Patre
  Ansys Employee
  
  Hello anshu16
  
  Let me check and get back to you.
- April 24, 2018 at 10:12 am
  
  Naresh Patre
  Ansys Employee
  
  Hello anshu16
  
  Changing the material model option in the material assignment to ideal gas will activate the Density Difference buoyancy model.
  
  Please check out below link from online help document for 2 models:
  
  https://ansyshelp.ansys.com/account/secured?returnurl=/Views/Secured/corp/v190/aim_all/aim_physics/fluids/flow/topics/c_flu_buoyancy_modeling.html
  - April 24, 2018 at 2:53 pm
    
    asharma
    Subscriber
    
    Naresh Patre Thank you. I am unable to access the link you provided. Could this be because I am currently using a trial version of ANSYS Aim and not really a "Customer" yet? In that case, is there another way to access this web page?
  - April 24, 2018 at 3:19 pm
    
    Naresh Patre
    Ansys Employee
    
    anshu16 That should not be the reason. Are you able to login to https://ansyshelp.ansys.com ?
  - April 24, 2018 at 4:02 pm
    
    asharma
    Subscriber
    
    Naresh Patre I am not able to login. When i try signing up, it asks me Account number/Customer number which I am not sure I have.
  - April 24, 2018 at 5:12 pm
    
    Naresh Patre
    Ansys Employee
    
    anshu16 I will check about the login and let you know. Meanwhile, I am attaching the snapshot of help section on buoyancy model.
  - April 25, 2018 at 9:27 am
    
    Naresh Patre
    Ansys Employee
    
    Hello anshu16 Fill out the required data in Registration form except account number and then click "Contact Me"
  - May 2, 2018 at 1:35 pm
    
    asharma
    Subscriber
    
    Naresh Patre Thank you, done!

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