Williams, OwenRobbins, Matthew Lloyd2021-07-072021-07-072021-07-072021Robbins_washington_0250O_22582.pdfhttp://hdl.handle.net/1773/46996Thesis (Master's)--University of Washington, 2021Experimental examinations of incompressible flow over a novel speed-bump geometry were conducted towards the development of a turbulence model validation dataset for separated flows. Efforts to characterize the boundary conditions of the experiment were performed including a survey of flow uniformity and side-wall boundary layers at the inflow plane of an empty test section, and measurement of the as-built test model. Surface pressures over the speed-bump were examined and revealed a series of favorable and adverse pressure gradients in the streamwise direction with features associated with a quasi-two-dimensional line of flow separation. Statistical measurements of the flowfield were obtained with planar particle image velocimetry to ascertain model-installed inflow properties, the extent of relaminarization on the upstream slope of the speed-bump, and the size and shape of the separated region. The features of separation, in both the flowfield and on the surface, exhibited a dependency in Reynolds number below Re_L = 2.55 x 10^6 and generally poor agreement with corresponding RANS simulations. Extensive documentation of the experimental facility, instrumentation, signal processing procedures, and treatment of uncertainty is provided to establish a high level of validation completeness. In accordance with the framework of Oberkampf and Smith, the model validation completeness of this experiment meets at least level one completeness and is at or approaching level two for most attributes.application/pdfen-USCC BYComputational Fluid DynamicsSeparated FlowsTurbulenceVerification and ValidationWall Bounded FlowsWind TunnelAerospace engineeringFluid mechanicsAeronautics and astronauticsThesis