Which of these models would be the best for flow over a submarine?(a) 3-D Navier-Stokes equation for compressible flow without a turbulence model(b) 3-D Navier-Stokes equation for incompressible flow without a turbulence model(c) 3-D Navier-Stokes equation for compressible flow with a turbulence model(d) 3-D Navier-Stokes equation for incompressible flow with a turbulence modelThe question was asked during an interview.My doubt stems from Applications topic in section Philosophy of Computational Fluid Dynamics of Computational Fluid Dynamics

Which of these models would be the best for flow over a submarine?(a)

1.	Which of these models would be the best for flow over a submarine?(a) 3-D Navier-Stokes equation for compressible flow without a turbulence model(b) 3-D Navier-Stokes equation for incompressible flow without a turbulence model(c) 3-D Navier-Stokes equation for compressible flow with a turbulence model(d) 3-D Navier-Stokes equation for incompressible flow with a turbulence modelThe question was asked during an interview.My doubt stems from Applications topic in section Philosophy of Computational Fluid Dynamics of Computational Fluid Dynamics
Answer» The correct answer is (d) 3-D Navier-Stokes equation for incompressible flow with a turbulence MODEL Explanation: Incompressible flow is CHOSEN as the flow of water will MOSTLY be incompressible unless the flow velocity is very high. Turbulence model is chosen as the flow PROPERTIES will GET abrupt change due to high Reynolds number.

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