Question

The condition of irrotationality for a two-dimensional flow is satisfied when rotation w everywhere is (less than — equal to — more than) zero.

Answer 1

Zero.

Step-by-step explanation:

Lets take velocity V is given as in 2 dimensional flow

V=u i +v j

V=f(x,y)

u=f(x,y)

v=f(x,y)

Rotational ability ω given as

`\omega =(1)/(2)\left ((\partial v)/(\partial x)-\frac{\partial u} {\partial x}\right)`

If

ω=0 ,then flow will be irrotational.

ω ≠0 ,then flow will be rotational.

So we can say that , ω will be zero every where for irrotational two dimensional flow .