Analysis of wake structure downstream of rough surface using volumetric 3-D measurement

Wake structures downstream of rough surface were analyzed by a 3-D volumetric image based measurement system. The wake structure was shown to have a direct correlation to the roughness of the surface, with the wake deviate from the boundary layer drastically for a very rough surface. A number of rough surfaces were tested to show the various wake formations due to various degrees of roughness. The 3-D volumetric system was employed for the measurement to allow the complete 3-D wake structure to be measured. Such 3-D results allowed instantaneous understanding of the roughness effect to the surrounding flows.