Fluids

Fluids

ideal gas law and imcompressible ideal gas

    • Weiqiang Liu
      Subscriber

      Hi all,


      During my recent simulation work, I found an interesting thing. That is if I use imcompressible ideal gas to calculate density of mixture, results would be a mess. In other words, results are very unreasonable. However, if I use ideal gas law as density method, results would be very reasonable. 


      Ps: I used laminar flow in my model.


      I am wondering why would this happen?


      Best regards


      Weiqiang

    • RK
      Ansys Employee

      Hi Weiqiang, 


      Note the difference between using the incompressible and the ideal gas model for density. For the incompressible ideal gas, the density is a function of only the operating pressure where as for the ideal gas law, density is a function of the sum of operating pressure and gauge (local) pressure. 

    • DrAmine
      Ansys Employee
      That is obvious especially in case of closed cavities or flow underlying strong pressure variations.n
    • Weiqiang Liu
      Subscriber
      Hi all,nReplying to individual comment is not allowed in new version of this forum? Anyway, thank your guys for giving me suggestions!nBest regardsnweiqiangn
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