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Showing 1 to 20 of 40 for “"Turbulence structure"”.
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Turbulence structure of a model seagrass meadow
… The principal goal was to characterize the turbulence structure of a depth-limited canopy, a gap that presently exists in the knowledge concerning the interaction of a unidirectional flow with an assemblage of plants. The experiments were carried out in an open channel flume with a model …
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The turbulence structure of trailing vortex wakes
… is a two-part study of the mean flow and turbulence structure of isolated vortices and counter-rotating vortex pairs. In the first part, the turbulence structure of an isolated vortex was studied using three-component velocity measurements. Vortices were generated using two symmetrical …
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MEAN TURBULENCE STRUCTURE IN STRONGLY HEATED AIR FLOWS.
… simple versions of the van Driest mixing length turbulence model. In general, both models agreed with the measurements reasonably well, but for the higher heating rates neither model was completely satisfactory in predicting the velocity profiles. When the buoyancy parameter reached 0.3, the peak …
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Turbulence Structure Of Plane Surface Jets In A Current
… The emphasis of this research is to study the turbulence characteristics of surface jets in shallow, deep, and flowing ambient fluid; and to examine the effect of the free surface as a moving boundary, with particular attention given to the development, growth, and similarity properties of …
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Turbulence structure and flow resistance in oscillatory boundary layer flows
Submission published under a 24 month embargo labeled 'Closed Access', the embargo will last until 2022-12-01
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The Turbulence Structure of Heated Supersonic Jets with Offset Total Temperature Non-Uniformities
… which links the jet boundary conditions to the turbulence production in the jet plume and the far-field radiated noise must be established. The research presented herein was conducted on the hypothesis that introducing thermal non-uniformities into a heated supersonic jet flow can favorably …
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Open-Channel Flow With Roughness Elements of Different Spanwise Aspect Ratios: Turbulence Structure and Numerical Modeling
… as an important parameter that determines the turbulence structure of the so-called roughness sublayer through the associated eddy-shedding process. The present work makes use of acoustic Doppler anemometry and traditional hot-film sensors to investigate the structure of the turbulence induced …
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An Experimental Investigation Into the Effects of Wall Heat Flux on the Turbulence Structure of Developing Boundary Layers at Moderately High Reynolds Numbers
Made available in DSpace on 2014-12-10T22:48:27Z (GMT). No. of bitstreams: 1 7511767.pdf: 5449807 bytes, checksum: f9d017f8be5a4f654fb468f7057d1a5f (MD5) Previous issue date: 1974
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The source and evolution of turbulence in trailing vortex pairs
… to obtain a more complete understanding of the turbulence structure of these flows. Statistical and spectral results, as well as filtered results and estimates of the effects of vortex wandering on the characteristics of the flows are presented. The results of the vortex pair are compared with …
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Analysis of Two-point Turbulence Measurements for Aeroacoustics
… The analyses provide information on the turbulence structure of the flows as it would be encountered by hypothetical noise producing blades passing through the flows. Two-point measurements taken in the first flow, a lifting wake from a rectangular NACA 0012 half wing, are used to …
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Turbulent wakes in turbulent streams
… used to study the effects<br/>of free-stream turbulence on axisymmetric wakes. In both cases the wake was introduced to<br/>various turbulent streams having various levels of turbulence intensity and length scales. It<br/>was found that the presence of the free-stream turbulence changes the …
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An experimental investigation of heat transfer in three-dimensional and separating turbulent boundary layers
The turbulence structure of convective heat transfer was studied experimentally in complex three-dimensional and separating turbulent boundary layers. Three test cases whose fluid dynamics have been well documented were examined. In case 1, time- and spatially-resolved surface heat transfer was …
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The Two Point Correlation Structure of a Cylinder Wake
… for an open rotor ingesting inhomogeneous turbulence. An important aspect of the turbulence ingestion problem is understanding how different inflow boundary conditions effect the sound produced by a rotor. In the present study the turbulence structure of two plane wakes were compared. …
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Flow and solute transport in random cylinder arrays : a model for emergent aquatic plant canopies
… laboratory measurements of the mean drag, turbulence structure and intensity, and lateral dispersion of passive solute in arrays of randomly-distributed cylinders, a model for emergent, rigid aquatic plants. Mean drag per cylinder length normalized by the mean interstitial fluid velocity …
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A turbulence model for steady and unsteady boundary layers in strong pressure gradients
A new turbulence model designed for two-dimensional, steady and unsteady boundary layers in strong adverse pressure gradients is described. The model is developed in a rational way based on an understanding of the flow physics obtained from recent experimental observations. The turbulent shear …
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Multi-Conjugate Adaptive Optics for LINC-NIRVANA : Laboratory Tests of a Ground-Layer Adaptive Optics System and Virtical Turbulence Measurements at Mt. Graham
Turbulence in Earth's atmosphere severely limits the image quality of ground-based telescopes. With the technique of Adaptive Optics, the induced distortions of the light can be measured and corrected in real-time, regaining nearly diffraction-limited performance. Unfortunately, when using a single …
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Turbulence and transport phenomena in edge and scrape-off-layer plasmas
… reports recent experimental studies of edge turbulence structure using gas-puff-imaging at high time resolution in a radially broad zone at the low-field-side of Alcator C-Mod[1], and highlights the connections between its characteristics and particle transport. Within the framework of this …
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Open channel turbulent boundary layers and wall jets on rough surfaces
… rates at the surface are determined by the turbulence structure in the near-wall region. Although many flows of practical interest occur on rough surfaces, our understanding and ability to predict rough wall turbulent flows lags far behind the corresponding technology for smooth surfaces. …
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Experimental investigation of the near wall flow structure of a low Reynolds number 3-D turbulent boundary layer
… were used to examine the near-wall flow structure of 2-D and 3-D turbulent boundary layers (TBLs) over a range of low Reynolds numbers. The goals of this research were (1) an increased understanding of the flow physics in the near wall region of turbulent boundary layers, (2) to observe …
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