Dust distribution in protoplanetary disks Dr. Jean Francois Gonzalez Centre de Recherches Astronomiques de Lyon Tuesday November 8th, 11am in the large conference room, Knowing the dust distribution in protoplanetary disks is important to interpret observations without making the questionable assumption that gas and dust are well mixed. It is also important as is sets the initial conditions for planet formation. We studied the effect of aerodynamic drag exerted by gas on dust, making it slow down, settle to the midplane and spiral inwards. I will present the results of our numerical simulations using an SPH (Smooth Particles Hydrodynamics), two-fluid, locally isothermal, non self-gravitating and three- dimensional code describing a protoplanetary disk. I will also show synthetic scattered light images computed from the simulation results, and how they compare to observations of disks.