B.C.:pressureinlet,pressureout,velocity zerogradient,
 

Hi,

I have always been thinking about if it could be solved which BC is like this:
Image a cyclinder, pressureinlet, pressureoutlet, inlet and outlet velocity is zerogradient.

In fluent, looks like it can be solved.
But in Foam,I dont know which kind of BC type would be suitable.

Anyonw have any idea?Thanks in advance.