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 model
The question was asked during an interview.
My doubt stems from Applications topic in section Philosophy of Computational Fluid Dynamics of Computational Fluid Dynamics