Volumetric thermal expansion (Beta)

- September 6, 2019 at 12:26 pm
  
  naada
  Subscriber
  
  II would like to ask how can I get the volumetric thermal expansion for compressible ideal gas?. The density will be varying due to temperature and pressure can I consider it as (1/T)?
- September 6, 2019 at 1:34 pm
  
  Rob
  Ansys Employee
  
  Ideal gas uses the ideal gas law: not sure why you need an expansion coefficient?
- September 6, 2019 at 1:40 pm
  
  naada
  Subscriber
  
  I’m working in natural convection I need it to get the Rayleigh number:
- September 9, 2019 at 2:04 pm
  
  Rob
  Ansys Employee
  
  Probably not unreasonable https://en.wikipedia.org/wiki/Rayleigh_number Not sure I've ever calculated Ra for a domain.
- September 11, 2019 at 7:57 am
  
  DrAmine
  Ansys Employee
  
  Yes the expansion coefficient for ideal gas is 1/T if you assume isobaric condition which is not always true. I guess for the whole domain you need to get an average value of T so that you get an average of the thermal expansion coefficient

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