The slug of air in a port should not "flow", it oscillates forward and back in the direction of the tube.
As far as turbulence created as the slug of air reaches a discontinuity, the circled 180 degree "U-turn" is the same regardless of what side of the cabinet it faces:
Neither are "ideal" in terms of symmetry, but in terms of sonic performance not much different.
If the slug of air doesn't flow, how would one ascribe a "velocity" to it? It's just an oscillatory flow, backwards and forwards.
Which of the two designs shown below does not have a right-angle bend in the oscillating slug of air?
Which of the two designs shown below does not have a right-angle bend in the oscillating slug of air?
The problem of all vents is the transition from (predominant) pressure to (predominant) motion and vice versa.
This transition should be gradual and controlled, otherwise there will be losses and turbulent flow.
So always imagine what happens at both ends of the oscillating slug of air:
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