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
Answer: d
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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