Atmospheric thermodynamics 1 Boundary layer flow 1 Boundary layers 1 Buoyancy 1 Drag 1 Drag forces 1 Flow field measurement 1 Flow separation 1 Freely moving 1 Lift force 1 Motion analysis 1 Moving spheres Particle-fluid flow 1 Refractive index 1 Reynolds number 1 Rotation 1 Shear flow 1 Shear-induced lift 1 Spheres 1 Three-dimensional flow-fields 1 Translational motions 1 Turbulence 1 Turbulent boundary layers 1 Turbulent flow 1 Velocity measurement 1 Vortex flow 1 particle/fluid flow 1