Hydraulics and Fluid Mechanics in ME
The fluid forces considered in the Navier Stokes equation are

pressure, viscous and turbulent
gravity, viscous and turbulent
gravity, pressure and turbulent
gravity, pressure and viscous

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Hydraulics and Fluid Mechanics in ME
When an ideal fluid flows past a sphere

lowest pressure intensity occurs at rear stagnation point
highest intensity of pressure occurs around the circumference at right angles to flow
total drag is zero
lowest pressure intensity occurs at front stagnation point

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