Well they aren't passing thru it, but when they "hit it" they just stop.

Shouldn't the streamlines that hit the curved plate follow the shape of the curve and deflect to the right, and not just stop. I can't figure this out, so I could configure shape of the fin the optimal flow efficiency. Because my most successful model has this.

Has 1/2 of the tank un-used - no streamlines.
Does number of points = more realistic representation of air travelling ( represented via streamlines)
Thank you for your replies.