Print Email Facebook Twitter Self-Sustaining Mechanisms in Wall Bounded Turbulence: Merging & auto-generation of vortices Title Self-Sustaining Mechanisms in Wall Bounded Turbulence: Merging & auto-generation of vortices Author Goudar Vishwanathappa, M. Contributor Elsinga, G.E. (mentor) Breugem, W.P. (mentor) Faculty Mechanical, Maritime and Materials Engineering Department Process and Energy Programme Solid and Fluid Mechanics Date 2012-07-04 Abstract For channel flow, we explore how a hairpin eddy may reach a threshold strength required to produce additional hairpins by means of auto-generation. This is done by studying the evolution of two eddies with different initial strengths (but both below the threshold strength), initial sizes and initial stream-wise spacing between them. The numerical procedure followed is similar to Zhou et al [1999]. The two eddies were found to merge into a single stronger eddy in case of a larger upstream and a smaller downstream eddy placed within a certain initial stream-wise separation distance. Subsequently, the resulting stronger eddy was observed to auto-generate new eddies. Merging of eddies thus is a viable explanation for the creation of the threshold strength eddies. Subject Auto-generationHairpin vorticesTurbulent flow To reference this document use: http://resolver.tudelft.nl/uuid:199137e9-6675-41fe-8f66-bba1e46d0819 Part of collection Student theses Document type master thesis Rights (c) 2012 Goudar Vishwanathappa, M. Files PDF main.pdf 8.14 MB Close viewer /islandora/object/uuid:199137e9-6675-41fe-8f66-bba1e46d0819/datastream/OBJ/view