Modify the Code 3 given in Kundu et al., for vorticity-stream function formulation of the Navier-Stokes equation, such that: a) The velocity vectors are plotted similar to those in Fig. 6.15. b) The time variation of the vorticity values are plotted at user-selected grid points in the mesh on the same graph. Do the same for velocity magnitudes: V=+v. Re-run the code for the case shown in Fig. 6.13 and submit the modified code and the plots created. Show the modifications made and discuss the results. 1 0.8 0.6 0.4 0.2 0 Fig. 6.13 0.5 1 0.8 0.6 0.4 0.2 0.5 1 Fig. 6-15