need for help
 

i m solving hydrodynamically developing in channel partially fileld with porous medium in terms of stream function-vorticity formulation. i had written a code in fortran using finite diffrences, SAR Scheme. but the velocity profile at the fully developed X is not matching with anlytical solution. i m not getting any kink in the profile. plz help me regarding this. could any but sugeest the code.thanking you.