Complex three-dimensional vortex flows develop at the junction of a gas turbine airfoil and its casing (endwall). These flows increase the transfer of heat from the combustion gases to the metal parts and contribute to reduced aerodynamic efficiency. Past studies have shown that the use of a large fillet at the airfoil-endwall junction can reduce or eliminate the endwall vortex flow pattern. To...

Title of dissertation: DEVELOPMENT OF A TIME-ACCURATE VISCOUS LAGRANGIAN VORTEX WAKE MODEL FOR WIND TURBINE APPLICATIONS Sandeep Gupta, Doctor of Philosophy, 2006 Dissertation directed by: Minta Martin Professor J. Gordon Leishman, Department of Aerospace Engineering A second-order accurate model has been developed and validated for modeling the unsteady aerodynamics of a wind turbine. The free...

one of the most common methods for controlling and increasing maneuverability of projectiles, especially the ones which move at high altitude and in low density air, is using lateral or reaction jets. the resultant force of the reaction jet is related to the jet and flow parameters. for finding their relation experimental, numerical, and analytical methods have been used. in order to change the...

This study aims to investigate the aerodynamic analysis of a Darrieus-type vertical axis wind turbine (VAWT) using Lattice Boltzmann Method (LBM). The objective is assess accuracy and performance meshless LBM approach in predicting torque coefficients, velocity, turbulence intensity, vorticity distributions for VAWT analysis. Two modelling approaches, Large Eddy Simulation (LES) Reynolds-Averag...

This paper presents the results of numerical and experimental studies wind action on longitudinal finned tubes LNG ambient air vaporizers. The main objective study was to determine aerodynamic drag coefficients for with different number fins considering various directions action. Numerical calculations were performed using CFD analysis, while tests carried out in a tunnel test stand. obtained i...

A prominent feature of gliding flight in snakes of the genus Chrysopelea is the unique cross-sectional shape of the body, which acts as the lifting surface in the absence of wings. When gliding, the flying snake Chrysopelea paradisi morphs its circular cross-section into a triangular shape by splaying its ribs and flattening its body in the dorsoventral axis, forming a geometry with fore-aft sy...

In order to predict the structural responses under random wind loads to avoid catastrophe failures, structural dynamic analysis is necessary, which requires a reasonable description of wind loads on structures. Based on the equations of fluid mechanics, equations for aerodynamic forces for structures in motion and coefficients of drag, lift and pitching moment for static structures are derived ...

BACKGROUND Chronic epidemiologic studies of particulate matter (PM) are limited by the lack of monitoring data, relying instead on citywide ambient concentrations to estimate exposures. This method ignores within-city spatial gradients and restricts studies to areas with nearby monitoring data. This lack of data is particularly restrictive for fine particles (PM with aerodynamic diameter < 2.5 ...

Abstract The aerodynamic characteristics of NACA4412 airfoil with different pitching motion elements were compared and analyzed based on CFD in this research. results are acquired as follows: the difference between lift drag coefficients during pitch up down motions becomes larger increase amplitude or initial angle attack; increases, coefficient grows slightly greater much greater; attack slig...