gas mixture – hydrogen/ helium (ANSYS fluent 2019R3)

- April 30, 2020 at 5:13 pm
  
  timothyyick
  Subscriber
  
  Hi,
  
  I am trying to define a gas mixture - hydrogen/ helium (the ratio is 2:1, which is more hydrogen than helium in the mixture). Is there a function in ANSYS that can define the mixture (with different ratio)? or i need to define a user-define mixture? Based on specific heat, density, molecular weight and viscosity (opps....all physic stuff....), in average for both gases?
- May 4, 2020 at 1:54 pm
  
  Karthik Remella
  Administrator
  
  Hello,
  
  Please see the details about User-defined-mixing-law in the following link, These contain the necessary equations on how fluid properties are estimated.
  
  In the Fluent User Guide, under each property (density, viscosity), you will see a page titled - Composition-Dependent Density for Multicomponent Mixtures or composition-dependent Density for Multicomponent Mixtures
  
  https://ansyshelp.ansys.com/account/secured?returnurl=/Views/Secured/corp/v201/en/flu_ug/flu_ug_sec_density_comp_depend.html
  
  Please use these links to see if these equation are applicable for your analysis.
  
  If they are not, you will need to use UDFs to create your custom mixture properties.
  
  If you need help on how to access the above link, please go through the following post.
  
  /forum/forums/topic/how-to-access-the-ansys-online-help/
  
  Also, moving this question to the "Fluid Dynamics" thread for better visibility
  
  Thank you.
  
  Best,
  
  Karthik