The geometry is specified in the interface with the
surfaceAreas[n]
, the roughnesses[n]
and
the lengths[n] along the flow path. Moreover the fluid flow is
characterized for different types of devices by the characteristic
dimensions[n+1]
and the average velocities
vs[n+1]
of fluid flow. See
Pipes.BaseClasses.CharacteristicNumbers.ReynoldsNumber for
example definitions.