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

3-D Navier-Stokes equation for incompressible flow with a turbulence model

3-D Navier-Stokes equation for compressible flow without a turbulence model

3-D Navier-Stokes equation for incompressible flow without a turbulence model

3-D Navier-Stokes equation for compressible flow with a turbulence model

Which of these models of fluid flow give complete partial differential equations directly?

Infinitesimally small fluid element fixed in space

Finite control volume moving along with the flow

Finite control volume fixed in space

Infinitesimally small fluid moving along with the flow

Finite control volume fixed in space

Finite control volume moving along with the flow

Infinitesimally small fluid element moving along with the flow

Infinitesimally small fluid element fixed in space

Corporate- level strategic planning

Strategic business unit level strategic planning

Operational level strategic planning