Lagrangian particle tracking in strained and buoyant flows

We present experimental particle tracking results in two turbulent flow configurations, straining flow and buoyant flow. Our focus is on the influence of large scale structure of such flows on the motions of passive and inertial particles, in particular acceleration statistics, Lagrangian structure functions, and two point statistics. The results are contrasted with previous work, and our results from approximately isotropic flows. The Eulerian structure of the underlying flow field is measured by applying the PIV method.