Inviscid flow
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A fluid flow where viscous (friction) forces are small in comparison to inertial forces is said to be inviscid. The assumption that viscous forces are negligible can be used to simplify the Navier-Stokes equations. Inviscid flow occurs in fluids with a large Reynolds number. Much of the time effects of viscosity are confined to narrow boundary regions, and shear stresses are negligible in the vast bulk of the fluid.
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