When Can You Assume Inviscid Flow?
In Inviscid Flow, Since the Viscous Forces Are Zero, the Reynolds Number Approaches Infinity. When Viscous Forces Are Negligible, the Reynolds Number Is Much...
In inviscid flow, since the viscous forces are zero, the Reynolds number approaches infinity. When viscous forces are negligible, the Reynolds number is much greater than one. In such cases (Re>>1), assuming inviscid flow can be useful in simplifying many fluid dynamics problems.
How do I know if my flow is inviscid?
Answer: All real flows exhibit the effects of mass diffusion, viscosity(friction) and thermal conduction such flows are called viscous flows. A flow that is assumed to involve no friction, thermal conduction or diffusion is called an inviscid flow.
Can inviscid flow be rotational?
Inviscid flow can be rotational. As pointed out in an earlier reply, inviscid flows with vortices are good examples. It might help to know that vorticity is conserved in inviscid flows, i.e., Euler equations are incapable of vorticity production.