[aa_diamanti]

Hi everyone,

I am fairly new to StarCCM+. I am running a simple simulation in a 3D curved pipe, where I created local cylindrical coordinate systems at the ends (Cylindrical_PAI and Cylindrical_DAO).
I would like to implement a parabolic inlet velocity profile using a field function, and I am unsure either on how to do that and on how to verify if the function has been implemented correctly.
This is what I have done so far:

1. created user defined field function (scalar): -2*0.2388*(1-pow( ($$Position("Cylindrical_PAI")[0]/1.81), 2 ) )
(The minus sign is explained in point 2)

2. In my inlet boundary I have this set:

Physics conditions:
Flow direction specification > components
Reference frame specification > Lab frame
Velocity specification > magnitude + direction

Physics values:
Flow direction > field function > area (the area field function creates a vector normal to the surface I believe, so in order for the flow to go inside a minus sign was necessary > coordinate system: Cylindrical_PAI
Velocity magnitude: the field function defined in 1

I am running a few iterations to see if the profile has been implemented correctly and I use a vector scene with the inlet and outlet boundaries to check that.