Contradiction in COMSOL's Documents

Hi All,

I have found a contradiction in COMSOL's manual about the same example that has different names in version 3.5 and 4.4.

In 3.5 the PDF document states that Reynolds number = diameter of the pipe*density*velocity/dynamic viscosity
In 4.4 the PDF document states that Reynolds number = length of the pipe*density*velocity/dynamic viscosity

So which one is correct?

Please refer to the attachments.

Thanks.
Marwan