Theoretical predictions for the cold part of the colliding wind   interaction zone
  We present 2D and 3D hydrodynamical simulations of the colliding wind interaction zone in WR+O binaries. It is shown that 3D effects can basically explain certain observed, orbit dependent flux variations. Possible connections between the interior structure of the interaction zone and dust formation are outlined and its stability is re-investigated. 
D. Folini, R. Walder