Fluid flow which is not subjected to direct influence of the fluid viscosity.It may happen for low- viscosity fluids or for the very high Reynolds numbers(except for the indirect influence of contact forces, see below).
In this case case Navier-Stokes fluid flow momentum equation simplifies simplifies to Eauler fluid flow momentum equation.
This flow regime happens for high Reynolds numbers
, which originates from:LaTeX Math Inline body {\rm Re} \gg 1
| low-viscosity fluids | high velocities
| large distance to solid boundaries restricting the flow
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The Reynolds numbers should not necessarily to be very high to induce an inviscid flow and many a laminar flows
| LaTeX Math Inline | ||
|---|---|---|
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This makes Eauler fluid flow momentum equation a very popular modelling tool in Fluid Dynamics.
In many practical applications the fluid viscosity can not be neglected even for the low-viscosity fluids.
This happens for example, when fluid flow is restricted by happening close to solid boundaries which interaction (a friction) with the fluid depends substantially on fluid viscosity.
These effects can be accounted in inviscid flow model through the impact of dissipative contact forces.
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Physics / Mechanics / Continuum mechanics / Fluid Mechanics / Fluid Dynamics / Fluid flow
[ Navier-Stokes fluid flow momentum equation ] [ Eauler fluid flow momentum equation ]