A structure consisting of quasi-laminar and turbulent regions in a stripe pattern, which can be found in a transitional plane channel flow, is called ‘turbulent stripe’. In this work, its formation from a turbulent spot has been investigated using a direct numerical simulation in a relatively large-scale computational domain of Lx × Ly × Lz = 731.4δ × 2δ × 365.7δ. We found that a spot developed into the turbulent stripes, as the spot split in the spanwise direction and took in the form of V-shape. Quasi-laminar and turbulent regions coexist inside the spot and each region became multiple V-shape. Several branching turbulent regions expanded from the edge of the spot and parallel to each other obliquely to the streamwise direction with an angle of about 30°. It was also found that the branching turbulent region gave rise to oblique waves at their edges.
- Fluids Engineering Division
DNS of Turbulent Spot Developing Into Turbulent Stripe in Plane Poiseuille Flow
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Aida, H, Tsukahara, T, & Kawaguchi, Y. "DNS of Turbulent Spot Developing Into Turbulent Stripe in Plane Poiseuille Flow." Proceedings of the ASME 2010 3rd Joint US-European Fluids Engineering Summer Meeting collocated with 8th International Conference on Nanochannels, Microchannels, and Minichannels. ASME 2010 3rd Joint US-European Fluids Engineering Summer Meeting: Volume 1, Symposia – Parts A, B, and C. Montreal, Quebec, Canada. August 1–5, 2010. pp. 2125-2130. ASME. https://doi.org/10.1115/FEDSM-ICNMM2010-30956
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