A rotor assembly having a wear member secured to an inner surface of the outer wall of the flow path. The wear member is made of material abradable by the blades. The wear member is located upstream of the blades. A downstream end of the wear member is abradably shaped by the blades upon rotation. An inner surface of the wear member is directed radially inwardly along a direction of flow in the flow path for deflecting a boundary layer of the flow into the annular blade path. A gas turbine engine and a method reducing tip vortices in a rotor assembly are also discussed.