Turbulent structure of the corner region affected by channel meandering

Katsutoshi Watanabe; Hirofumi Onari; Takanori Saga

doi:10.1117/12.279749

21 November 1997 Turbulent structure of the corner region affected by channel meandering

Katsutoshi Watanabe, Hirofumi Onari, Takanori Saga

Proceedings Volume 3172, Optical Technology in Fluid, Thermal, and Combustion Flow III; (1997) https://doi.org/10.1117/12.279749
Event: Optical Science, Engineering and Instrumentation '97, 1997, San Diego, CA, United States

Abstract

Characteristics of turbulent structure of the corner region affected by channel meandering are investigated using flow visualization and a laser-Doppler velocimetry measurements. DPTV is a visualization technique, which is combined an integrated dye injection method with PTV, and visualize a dye streak pattern of coherent structure and a particle path line simultaneously. According as the channel meandering. Plandtl's first kind of secondary flow develops opposing to Plandtl's second kind of secondary flow in the corner region of the straight portion of the experimental open channel. Following the development of the secondary flow, the coherent structure with large-scale in streamwise and transverse direction is generated near the side wall of which the geometric configuration changes from convex to concave.Large-scale coherent structure near the side wall plays an important roles to increase turbulent intensities and generate large-scale shear structure.

Citation Download Citation

Katsutoshi Watanabe, Hirofumi Onari, and Takanori Saga "Turbulent structure of the corner region affected by channel meandering", Proc. SPIE 3172, Optical Technology in Fluid, Thermal, and Combustion Flow III, (21 November 1997); https://doi.org/10.1117/12.279749

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