Final results with and without aerofoil turning vane and one vortex generator.
Without:
With:
However, I am not completely happy. I want one long extrusion from top to bottom of the pillar, so that the end plates aren't placed in front of the area of interest. (I could of course cut the ends of the aerofoil section so that they're more horizontal, but then the turning vane gets even shorter.)
Incidentally, I spent some time tuning the inlet/outlet area (and of course the vane angle changes at same time) and got best results when inlet width was 17mm and outlet 8mm.