Ideal fluid is the fluid having viscosity zero
And flow of this fluid is called ideal flow or inviscid (negligible viscosity) flow.
No viscosity means no shear force
Atif said:
IDEAL Fluid is the one which has following characteristics during considering flow
1)Steady flow-moving with constant velocity
2)Incomprissible flow-no variation in density during flow
3)Non viscous flow- no energy lose because of resistance between layers of fluid and the surface through which the fluid is moving
4)Irrotational flow -fluid does not rotate like a whirl pool
