Instead of laminar fluid flow past a stationary object as in Figure 18.18a, consider the motion of an object moving at constant velocity through a stationary fluid. Do you expect the flow pattern surrounding the object to be the same as in Figure 18.18 a or different?

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Figure 18.18 Whether the flow of fluid past a stationary object is laminar or turbulent depends on the fluid's speed and viscosity and on the object's shape. (a) Low flow speed, zero viscosity (b) Low flow speed, nonzero viscosity Flow speed is zero at object's surface. (c) High flow speed, turbulence (d) High flow speed, streamlined object