Hints:

To plot velocity profile, you need $\frac{\text{d}\text{e}\text{l}\text{P}}{\text{d}\text{e}\text{l}\text{x}}.$ Use an equation that related flow rate with

$\frac{\text{d}\text{e}\text{l}\text{P}}{\text{d}\text{e}\text{l}\text{x}}.$ Given a volumetric flow rate you can calculate $\frac{\text{d}\text{e}\text{l}\text{P}}{\text{d}\text{e}\text{l}\text{x}}.$

For the CFD$,$ you need to obtain a solution for a given geometry like:

From your assumed flow rate, calculate $\text{'}v\text{'}$:

$v=\frac{\text{v}\text{o}\text{l}\text{u}\text{m}\text{e}\text{t}\text{r}\text{i}\text{c}\text{f}\text{l}\text{o}\text{w}\text{r}\text{a}\text{t}\text{e}}{(b.h)}$Hints:

To plot velocity profile, you need $\frac{dP}{dx}.$ Use an equation that related flow rate with

$\frac{dP}{dx}.$ Given a volumetric flow rate you can calculate $\frac{dP}{dx}.$

For the CFD$,$ you need to obtain a solution for a given geometry like: