To see how mass conservation places restrictions on the velocity field, consider the steady flow of fluid through ... so that the velocity V and density \rho are constant over the area A (figure 14).

Abstract: This study investigates the effect of flow velocity ... as building roof, walls and ground. Numerical simulation validated by wind tunnel experiments can be an alternative for the prediction ...

at Reynolds numbers that are not too small), the maximum flow velocity in the region where the streamtubes take their minimum area is about 1.74 times the velocity in the far-field.