4-17 Converging duct flow is modeled by the steady, two-dimensional velocity field of Prob. 4-16. The pressure field is given by P = P, -2U,bx + b'x° + y®) |2U,hx + b°x² + y°) where P, is the pressure at x = (), Generate an expression for the rate of change of pressure following a fluid particle.

xG 2. Find the rate of deformation for a line vortex with velocity field V=YG -Î+ x² + y² x² + y² Ans. Ex = -6 yy = 2xyG (x² + y² ) ² ¹ ² = ,&_= 0,& xyG (x² + y²)² ¹6 = -,&=&₁ = 0 -), G=const.

A

a. Given the velocity field u=(u,v,w) in Cartesian coordinates with u=2x+y, v=2zt, w=0. i. Find the equations of the corresponding streamlines (Eulerian concept) ii. Find the equations of the corresponding particle paths, i.e., the pathlines (Lagrangian concept). b. Show that the Vu=0 everywhere implies that volumes are conserved, i.e., the volume of red particles at t-0 is the same as at t=t. Hint: Write out what you must prove and use the theorems to get there.

4. Consider the steady, two-dimensional velocity field given by: u = 2xy-y²; v=x-y². Show that it is a possible 2d incompressible flow. Find the component of acceleration in x direction of a fluid particle at point (x, y) = (1,2)

Question 3 (a) A two-dimensional flow velocity field in the domain with non-dimensional coordinates x > 0 and y > 0 is defined as: v = -Upxy i+ Upxy j where i and j are the unit vectors in the x- and y-directions respectively and Uo is a constant with units m/s. (i) Determine the magnitude and direction of the velocity at the point (1,1). (ii) Find the equation of the streamlines.

t = 0