Abstract

In order to reduce the erroneous vectors which appear in image processing system for automatic measurement of flow fields with high vorticity and shearing strain rate and to ensure the measurement precision which is affected mainly by the digital sampling errors, a numerical simulation was executed using an elementary solution of two dimensional Oseen's equation as a flow model, which corresponds to the unsteady viscous diffusing free doublet flow. Four effects of vorticty and shearing strain rate, subregion size, tracer size, and interval between two pictures on erroneous vectors were investigated, and a quantitative estimation of sampling errors was proposed based on the simulation analysis.

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