Fluids

Fluids

Regarding ANSYS Fluent Mixture model

    • sj21
      Subscriber

       am a beginner in multiphase flows so please help me. I am trying to simulate a multiphase flow (two phase flow of gas and solid phase) using the Mixture model of ANSYS Fluent. I have a query regarding this.

      How to specify the primary phase (gas in this case) as inviscid.

    • Karthik R
      Administrator

      Hi,

      Can you not lower the viscosity of the gas phase to a very small number?

      Karthik

      • sj21
        Subscriber

        In the paper i am following they have taken the gas viscosity around 0.13 kg/(ms), is this low enough? Below i attached the paper for reference.

        https://www.researchgate.net/publication/274921586_Multiphase_CFD_Simulation_of_Solid_Propellant_Combustion_in_a_Small_Gun_Chamber

    • Rob
      Ansys Employee

      Water is 0.001003 kg/ms so I think you need to re-read the paper.    0.13 kg/ms is not going to flow easily! 

      • sj21
        Subscriber

        As per the temperature dependent relation given in the paper, i am getting the value for viscosity around 0.0007 to 0.001 kg/(ms)

    • Rob
      Ansys Employee

      Which isn't the 0.13 kg/ms you added earlier? If the paper is giving that range, there is a gas viscosity, and I'd use that. 

    • Karthik R
      Administrator

      0.0007 to 0.001 is not an inviscid flow. I agree with Rob. I'd use that value of viscosity.

    • Karthik R
      Administrator

      0.0007 to 0.001 is not an inviscid flow. I agree with Rob. I'd use that value of viscosity.

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