Proceedings Vol. 16 (2010)
ENGINEERING MECHANICS 2010
May 10 – 13, 2010, Svratka, Czech Republic
Copyright © 2010 Institute of Thermomechanics, Academy of Sciences of the Czech Republic, v.v.i., Prague
ISSN 1805-8248 (printed)
ISSN 1805-8256 (electronic)
list of papers scientific commitee
pages 153 - +17p., full text
Authors introduced a new method of processing flow visualisation images, aiming at identification of instability structures. In principle, the method utilises the structures' coherence. In two digital images, recorded at slightly different instants of time, the pixel pairs from the same position in the images are interrogated one by one. In each, vectors of the recorded quantity values are formed from n x n pixels in immediate neighbourhood. The correlation coefficient is then computed for the vector pair. High positive values of the coefficient indicate absence of change whereas values near zero indicate chaotic changes. Of interest are negative values, which indicate a coherent motion.
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