Playing with realflow simulations i found this weird behaviour:
Normal scene, all settings at default, only motion blur enabled, same frame just varying the shutter speed.
.bin mesh file sequence imported and meshed with Frost.
Motion blur enabled, fixed camera.
Same frame, different shutters speeds, animation speed in max: 30 fps.
Interesting is that mesh is created from scratch every frame (Is not the same geometry from frame to frame).
Corona applies a motion blur from a shutterspeed of 30+plus 1 (no motion blur in 1-30 shutterspeed interval). Below 30 just renders a frame a couple of frames before current.