initial condition for fully developed flow
 

I am analyzing 3D flow . I would like to give the inlet velocity profile as a paraboloid as the fully developed condition. The flow in the Z direction .
According to the theory U= (1/4 μ )*(dp/dz)*(r^2-R^2). Any one give me a suggestion about the fully developed velocity profile.How I can write the above expression.

I am the leaner of CFX . Kindly help me how to write CEL Expression.

The expression is trivial, you only need to look up the documentation for the variable name for dp/dz. If you look in the CEL reference guide you will find its variable name is "dp-dZ".

Have another look in the documentation, it is there. While you are at it, have another look at my post too - I already said the variable is called "dp-dZ".