Fluids

Fluids

Incompressible ideal gas vs ideal gas

    • naada
      Subscriber
      Hey

      Can someone please write me the Navier stokes equations for both models of incompressible ideal gas and ideal gas so I can understand the difference?.

      Thank you
    • DrAmine
      Ansys Employee

      Why you need the NS for that?  Ideal Gas EOS density=actual pressure/(Gas Constant*Actual Temperature), incompressible ideal gas density=p_op/(Gas Constant*Actual Temperature.)


       


      What is the problem you are facing?

    • naada
      Subscriber
      I read in one of the websites that in the ideal gas case energy and momentum are coupled but in case of incompressible ideal gas they are not how this can be possible in case of natural convection?. Like what is the effect of choosing incompressible ideal gas over ideal gas?.

      Best Regards;
      Nada
    • DrAmine
      Ansys Employee
      Incompressible ideal gas is to account for weak compressible gases where temperature dependency is important. Ideal gas is for compressible gases and acciubt for temperature and pressure dependency.

      Enclosed heated cavity: you get mass defect if use incompressible ideal gas as pressure ruse due to heating won't be felt in the density calculation
Viewing 3 reply threads
  • You must be logged in to reply to this topic.