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Showing 1 to 20 of 74 for “"Bluff Body"”.
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Stability and Vortex Shedding of Bluff Body Arrays
… and compared to that of flow over a single body. Based on the solutions of the laminar flow, a one-dimensional analytical analysis was performed on selected velocity profiles in the wake region. The results of this analysis were used to guide the interpretation of the two dimensional results …
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Simulation of vortex induced vibration of a bluff body structure
… numerical simulations of circular bluff body is a continuation of previous efforts trying to study the effect of frequency and amplitudes of the cylinder oscillation that is confined in the cross-flow and inline flow separately. The k-ε turbulence model is used to simulate the …
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Large eddy simulations of bluff-body wakes on parallel computers
… the characteristics of turbulent wakes of bluff bodies. The problem considered concerns turbulent flow over a square cylinder placed normal to a uniform free stream. The Reynolds number selected for the simulations is 21,400 where detailed experimental data are available. The computation …
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The Design and Analysis of Bluff Body Dynamic Distortion Generators
… StreamVanes. After extensive literature search, bluff bodies were identified as well-known geometries that create unsteady flow features, namely in the form of periodic, paired vortex shedding. Cylindrical bluff bodies create vortex streets that shed at a known frequency determined by their …
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The aerodynamics of a diffuser equipped bluff body in ground effect
… of the flow physics of a diffuser equipped bluff body in ground effect has been undertaken. Situated at the rear of a racing car undertray, the diffuser is an important component and the least understood part of the vehicle. Diffuser performance can change dramatically with vehicle ride …
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Energy Harvesting from the Vortex-Induced Vibrations of Bluff Body Oscillators
<p>Vortex-induced vibration (VIV) of bluff bodies provides an effective mechanism for harvesting energy from fluid flows. Yet, the complex fluid-structure interactions governing vibration amplitude, synchronization, and energy transfer in single and coupled oscillators remain only partially …
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Investigation of a space-time adaptive method for bluff body flows
The problem of large computational costs for achieving high accuracy uid dynamics simulations remains challenging. This thesis investigates an unstructured spacetime adaptive framework for unsteady ow simulations of the compressible Navier-Stokes equations. A fully-unstructured discretization of …
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Effect of Adaptive Tabs on Drag of a Square-Base Bluff Body
… tunnel testing of a 0.127m by 0.127m square-base bluff body to test the effectiveness of trailing edge tabulations to reduce drag in the Cal Poly 0.912m by 1.219 m low-speed wind tunnel. To accomplish this, the boundary layer was first measured on the trailing edge of the model for the three …
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Experimental investigation of unconfined bluff body stabilised flames with vapourised kerosene fuels
… pre-vapourised liquid fuels stabilised on a bluff body burner were investigated at two conditions: far from blow-off (φ/φbo = 1.20) and close to blow-off (φ/φbo = 1.01). Four different fuels were considered, two of which comprised of a single component (ethanol and heptane) while the other …
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Analyses of Bluff Body and Swirl-Stabilised Flames Using Large Eddy Simulation
… is present, is enhanced through the use of bluff body flame holders and swirling flow. However, these flames are prone to unstable phenomena that may hinder successful ignition or lead to the occurrence of flashback and other instabilities that may lead to flame blow-off. The stabilisation …
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An Optical Analysis of the Blowoff Behavior for Bluff Body-Stabilized Flames in Vitiated Flow
<p>In bluff body-stabilized flames, a variety of physical phenomena contribute to the flame destabilization as lean blowoff is approached. These effects include increased strain on the flame shear layers, decreased attenuation of Bénard-von Kármán vortex shedding, and the presence of thermoacoustic …
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A study of compressibility effects on laminar, unsteady flow past a two-dimensional bluff body
… laminar, unsteady flow past a two-dimensional bluff body. The study was performed by solving the governing equations of fluid motion. The set of integral-differential equations which govern the fluid motion were approximated by a finite volume discretization. A fifth order upwind biased …
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Simulating Bluff-body Flameholders: On the Use of Proper Orthogonal Decomposition for Combustion Dynamics Validation
… in the flame, shear-layer, and wake of a bluff-body-stabilized flame. A general validation process is presented which involves a comparison of experimental and computational results, beginning with single-point mean statistics and then extending to the dynamic modes of the data using POD …
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Numerical study of the reactive flow in a two-stream, coaxial-jet, axisymmetric bluff-body combustor
Thesis (Sc. D.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 1996.
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Effect of End-Plate Tabs on Drag Reduction of a 3D Bluff Body with a Blunt Base
… thesis involves the experimental testing of a bluff body with a blunt base to evaluate the effectiveness of end-plate tabs in reducing drag. The bluff body is fitted with interchangeable end plates; one plate is flush with the rest of the exterior and the other plate has small tabs protruding …
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Hydrodynamic linear stability of the two-dimensional bluff-body wake through modal analysis and initial-value problem formulation
… lead to a quite complete description of the bluff-body wake stability.
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Experimental Investigation of Drag Reduction by Trailing Edge Tabs on a Square Based Bluff Body in Ground Effect
… investigation of drag reduction devices on a bluff body in ground effect. It has previously been shown that the addition of end-plate tabs to a rectangular based bluff body with an aspect ratio of 4 is effective in eliminating vortex shedding and reducing drag for low Reynolds number flows. In …
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Analysis of vortex shedding in a various body shapes
The study of various bluff body shapes is important in order to identify the suitable shape of bluff body that can be used for vortex flow meter applications. Numerical simulations of bluff body shapes such as circular, rectangular and equilateral triangular have been carried out to understand the …
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