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Showing 1 to 20 of 318 for “"pressure gradient"”.
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Similarity in adverse pressure gradient turbulent flows
… to experimentally generate increasingly adverse pressure gradient flow data for comparison with published data, to find similarities allowing categorization leading to improved flow prediction.
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Vortical flows in an adverse pressure gradient
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Aeronautics and Astronautics, 1993.
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Jet Mixing Under the Influence of a Pressure Gradient
Made available in DSpace on 2014-12-10T22:48:10Z (GMT). No. of bitstreams: 1 7114686.pdf: 2819159 bytes, checksum: 67d50c40f2bfada45676a49287c9ff24 (MD5) Previous issue date: 1970
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Pressure signature in adverse-pressure-gradient wall bounded turbulent flows
… of universal patterns in wall-bounded adverse pressure gradient turbulent flows. For this purpose, the experimental work has been carried out towards further understanding of this class of flows, especially when the pressure gradient is increasingly adverse. Adverse pressure gradient turbulent …
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Turbulent boundary layers under complex spatial and temporal pressure gradient histories
Submission original under an indefinite embargo labeled 'Open Access'. The submission was exported from vireo on 2023-12-04 without embargo terms
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Demography of Alligator Snapping Turtles (Macrochelys Temminckii) Along a Fishing Pressure Gradient
… of <em>M. temminckii </em>along a fishing pressure gradient in East Texas streams. Most gear was abandoned and illegally deployed, with densities varying seasonally. Detectability of passive fishing gear declined with increasing gear age, water depth, and volume, but increased with …
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Pressure Gradient Effects in the Viscous Wall Region of a Turbulent Flow
… a study investigating the effects of an imposed pressure gradient on the viscous wall region of a turbulent flow are presented. Only imposed pressure gradients homogeneous in the streamwise direction are considered.
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Combined irregular roughness and favorable-pressure-gradient effects in a turbulent boundary layer
… surface roughness and moderate favorable-pressure-gradient (FPG) conditions on the structure of a turbulent boundary layer was assessed using two-dimensional particle image velocimetry (PIV) measurements in the streamwise{ wall-normal plane and stereo PIV measurements in the …
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Net Flow Through Soft Porous Media Generated by a Periodic Mean-Zero Pressure Gradient
… the effect of applying periodic mean-zero pressure gradients to a soft porous medium. These periodic mean-zero pressure gradients are composed of square waves, with a high magnitude positive pressure drop applied for 1/3 of the period and a negative pressure drop with half the magnitude …
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Analytical and experimental investigation of a turbulent mixing layer of different gases in a pressure gradient
… the turbulent mixing layer in adverse and zero pressure radients. Theory predicts the possible existence of equilibrium flows, and this was confirmed experimentally for turbulent shear layers between streams of helium and nitrogen. The only case for which similarity is possible is described. The …
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The Effects of Pressure Gradient and Roughness on Pressure Fluctuations Beneath High Reynolds Number Boundary Layers
… family of continually varying, bi-directional pressure gradient distributions are investigated in both wind tunnel experiments and steady 2D and 3D Reynolds Averaged-Navier-Stokes (RANS) computations. The effects of pressure gradient, pressure gradient history, roughness, combined roughness and …
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Axisymmetric and non-axisymmetric modes of instability for flow between rotating cylinders with a transverse pressure gradient
… where the flow is also subjected to a transverse pressure gradient. The problem considered is thus a combination of the problem first considered by Taylor (1923) and Dean (1938) for pure rotation and pure pressure flow, respectively. The investigation is restricted to the case where the annulus …
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The Resolution and Structure of High Reynolds Number Turbulent Boundary Layers Over Rough and Smooth Walls in Pressure Gradient
… wall boundary layers in non-equilibrium pressure gradients are experimentally investigated. Experiments in two wall configurations were performed; one with a hydrodynamically smooth test wall composed of flat aluminum panels, and the other with a rough surface consisting of 2 mm tall, …
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Active Flow Control of Subsonic Flow in an Adverse Pressure Gradient Using Synthetic Jets and Passive Micro Flow Control Devices
… result in boundary layer separation and loss of pressure recovery which reduces engine performance and in some cases may cause engine stall. Deployment of flow control devices can alleviate this problem to a large extent; however, almost all active flow control devices have some energy penalty …
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Preliminary Study On The Impact Of Impingement On The Effectiveness Of Film Cooling In The Presence Of Gas Path Pressure Gradient
… films discharge often has large stream wise pressure variations. All existing studies on coupled film and impingement cooling concentrated on the effect of the film depletion on the impingement heat transfer. This study investigates the impact of impingement on film cooling, where the jets …
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Horizontal pressure gradient and bed shear stress under double dam-break driven swash and validation of a Reynolds-Averaged Navier-Stokes equations based model
… morphodynamics through sediment transport gradients. Sediment transport rates are often estimated using bed shear stress as the main hydrodynamic driver. However, the importance of pressure gradients relative to bed shear stress in the swash zone is still poorly known. Thus, it is important …
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Three-dimensional Mechanisms in Compressor Flows
… the effect, on separation and loss, of the pressure gradient on the surface of the blade perpendicular to the meridional direction, here known as the transverse pressure gradient. The results of this thesis are contained within four chapters. The first two investigate the role of the …
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Transition in boundary layer flows
… influence of freestream turbulence and pressure gradient upon transition within a boundary layer developing on a flat plate is elucidated by a series of controlled experiments.<br/><br/>From the data accumulated, the concept of statistical similarity in transition regions is extended to …
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Prediction of transitional boundary layer properties for CFD software in engineering flows
… zero and constant adverse and favourable pressure gradients, and also the varying pressure gradient Rolls Royce T3C flows. The method gives good prediction of skin friction and transition length when the start of transition was in zero and favourable pressure gradient flows, but the …
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