Poiseuille flow example code for larger reynolds number

[harich...@gmail.com]

I have edited the Poiseuille flow example code to create channel flow for Reynolds number 100, 500,  800, 1000 (With water properties rho=1000 and nu=1e-6, Lx=2mm and Ly=0.3mm ). I found that Reynolds number 100 is obeying the Poiseuille curve correctly, where as for Re 500, 800 and 1000 was not giving the flow profile correctly.  Can this model be used for higher Reynolds number laminar flow?