Coherent Structures in Wall-Bounded Turbulence
Sign Up to like & getrecommendations! Published in 2018 at "Journal of Fluid Mechanics"
DOI: 10.1007/978-3-319-20388-1_3
Abstract: The current knowledge about some particular kinds of coherent structures in the logarithmic and outer layers of wall-bounded turbulent flows is briefly reviewed. It is shown that a lot has been learned about their geometry,… read more here.
Keywords: structures wall; bounded turbulence; wall bounded; coherent structures ... See more keywords
The numerical investigation of Lagrangian and Eulerian coherent structures for the near wake structure of a hovering Drosophila
Sign Up to like & getrecommendations! Published in 2019 at "Theoretical and Computational Fluid Dynamics"
DOI: 10.1007/s00162-019-00492-0
Abstract: An integrated simulation of a Drosophila wing–body combination in hovering flight has been carried out in order to analyze the Lagrangian and Eulerian coherent structures. A parallel unstructured finite volume method based on an arbitrary… read more here.
Keywords: near wake; topology; eulerian coherent; lagrangian eulerian ... See more keywords
A Geometric Heat-Flow Theory of Lagrangian Coherent Structures
Sign Up to like & getrecommendations! Published in 2020 at "Journal of Nonlinear Science"
DOI: 10.1007/s00332-020-09626-9
Abstract: We consider Lagrangian coherent structures (LCSs) as the boundaries of material subsets whose advective evolution is metastable under weak diffusion. For their detection, we first transform the Eulerian advection–diffusion equation to Lagrangian coordinates, in which… read more here.
Keywords: heat; geometry; diffusion; coherent structures ... See more keywords
Experimental investigation of flow development and coherent structures in normal and oblique impinging slot jets
Sign Up to like & getrecommendations! Published in 2018 at "Experiments in Fluids"
DOI: 10.1007/s00348-018-2653-6
Abstract: The development of normal and oblique impinging slot jets is investigated experimentally using planar particle image velocimetry. The study is performed for two jet Reynolds numbers, $${Re} = 3000$$Re=3000 and 6000, and four jet orientation… read more here.
Keywords: jet; coherent structures; wall; wall jet ... See more keywords
Three-dimensional characterization of Reynolds shear stress in near-wall coherent structures of polymer drag reduced turbulent boundary layers
Sign Up to like & getrecommendations! Published in 2021 at "Experiments in Fluids"
DOI: 10.1007/s00348-021-03263-y
Abstract: Experimental investigation is conducted using planar and tomographic particle image velocimetry measurements spanning the inner layer of Newtonian and drag-reduced zero-pressure gradient turbulent boundary layers. Low to moderate drag reduction is achieved by injecting two… read more here.
Keywords: rss regions; high rss; rss; coherent structures ... See more keywords
Numerical investigation of turbulent flow coherent structures in annular jet pumps using the LES method
Sign Up to like & getrecommendations! Published in 2018 at "Science China Technological Sciences"
DOI: 10.1007/s11431-017-9047-8
Abstract: Annular jet pumps that are used in hydraulic machinery have a very simple structure but very complex internal flow fields. Large eddy simulations were used to study the coherent structures in the turbulent flows in… read more here.
Keywords: vortex; jet; coherent structures; jet pumps ... See more keywords
Visualization and assessment of turbulent coherent structures in laminarescent boundary layers
Sign Up to like & getrecommendations! Published in 2018 at "Journal of Visualization"
DOI: 10.1007/s12650-017-0460-4
Abstract: Direct numerical simulation (DNS) with high spatial/temporal resolution of spatially developing turbulent boundary layers subject to very strong favorable pressure gradient (FPG) has been performed. The sudden acceleration imposed on the flow provokes a significant… read more here.
Keywords: assessment turbulent; turbulent coherent; boundary layers; coherent structures ... See more keywords
Computational characterisation of intermittent hydrodynamic behaviours in a riser with Geldart A particles
Sign Up to like & getrecommendations! Published in 2017 at "Powder Technology"
DOI: 10.1016/j.powtec.2016.12.060
Abstract: In the riser of a gas-solid circulating fluidised bed (CFB) with Geldart A particles, the multiscale interactions and diverse coherent structures give rise to an important hydrodynamic phenomenon called flow intermittency. In this work, the… read more here.
Keywords: geldart particles; intermittent; intermittency; coherent structures ... See more keywords
Layer formation in horizontally forced stratified turbulence: connecting exact coherent structures to linear instabilities
Sign Up to like & getrecommendations! Published in 2017 at "Journal of Fluid Mechanics"
DOI: 10.1017/jfm.2017.661
Abstract: We consider turbulence in a stratified ‘Kolmogorov’ flow, driven by horizontal shear in the form of sinusoidal body forcing in the presence of an imposed background linear stable stratification in the third direction. This flow… read more here.
Keywords: formation horizontally; linear instabilities; turbulence; coherent structures ... See more keywords
Coherent structures in the linearized impulse response of turbulent channel flow
Sign Up to like & getrecommendations! Published in 2019 at "Journal of Fluid Mechanics"
DOI: 10.1017/jfm.2019.15
Abstract: We study the evolution of velocity fluctuations due to an isolated spatio-temporal impulse using the linearized Navier–Stokes equations. The impulse is introduced as an external body force in incompressible channel flow at $Re_{\unicode[STIX]{x1D70F}}=10\,000$ . Velocity… read more here.
Keywords: velocity; channel flow; turbulent; coherent structures ... See more keywords
Nonlinear evolution and acoustic radiation of coherent structures in subsonic turbulent free shear layers
Sign Up to like & getrecommendations! Published in 2019 at "Journal of Fluid Mechanics"
DOI: 10.1017/jfm.2019.909
Abstract: Large-scale coherent structures are present in compressible free shear flows, where they are known to be a main source of aerodynamic noise. Previous studies showed that these structures may be treated as instability waves or… read more here.
Keywords: evolution; field; coherent; free shear ... See more keywords