Biases of PIV measurement of turbulent flow and the masked correlation-based interrogation algorithm |
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Authors: | L Gui J Longo F Stern |
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Institution: | (1) Iowa Institute of Hydraulic Research (IIHR) The University of Iowa Iowa City, IA 52242, USA, US |
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Abstract: | Influences of evaluation bias of the correlation-based interrogation algorithm on particle image velocimetry (PIV) measurement
of turbulent flow are investigated. Experimental tests in the Iowa Institute of Hydraulic Research towing tank with a towed
PIV system and a surface-piercing flat plate and simulations demonstrate that the experimentally determined mean velocity
and Reynolds stress components are affected by the evaluation bias and the gradient of the evaluation bias, respectively.
The evaluation bias and gradient of the evaluation bias can both be minimized effectively by using Gaussian digital masks
on the interrogation window, so that the measurement uncertainty can be reduced.
Received: 16 September 1999/Accepted: 7 February 2000 |
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