comparison of wake characteristics of model and prototype buildings in transverse winds by Earl Logan

Cover of: comparison of wake characteristics of model and prototype buildings in transverse winds | Earl Logan

Published by National Aeronautics and Space Administration, Scientific and Technical Information Office in Washington .

Written in English

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  • Wakes (Aerodynamics),
  • Winds,
  • Buildings

Edition Notes

Book details

StatementEarl Logan, Jr., Prapoj Phataraphruk, and Jingfa Chang
SeriesNASA contractor report ; NASA CR-3008, NASA contractor report -- NASA CR-3008
ContributionsPhataraphruk, Prapoj, joint author, Chang, Jingfa, joint author, United States. National Aeronautics and Space Administration. Scientific and Technical Information Office
The Physical Object
Paginationviii, 47 p. :
Number of Pages47
ID Numbers
Open LibraryOL14930086M

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Comparison of wake characteristics of model and prototype buildings in transverse winds. Washington: National Aeronautics and Space Administration, Scientific and Technical Information Office ; Springfield, Va.: for sale by the National Technical Information Service, (OCoLC) Material Type.

We use cookies to offer you a better experience, personalize content, tailor advertising, provide social media features, and better understand the use of our services. George C. Marshall Space Flight Center: A comparison of wake characteristics of model and prototype buildings in transverse winds / (Washington: National Aeronautics and Space Administration, Scientific and Technical Information Office ;, ), also by Earl Logan, Jingfa Chang, and Prapoj Phataraphruk (page images at HathiTrust).

acting on the TRWT model and higher velocity deficits in the near wake behind the TRWT model, in comparison with those of the SRWT case. Due to the existence of the auxil-iary rotor, more complex vortex structures were found to be generated in the wake behind the TRWT model, which greatly enhanced the turbulent mixing in the turbine wake.

A compar ison of wake characteristics of model and prototype buildings in transverse winds, NASA contractor report N°[4] Oka, S., Kostic, Z., Flow field past a single roughness.

and identify the characteristics of the wake vortices. Subsequently, the model is employed to reconstruct the unsteady streamwise and transverse velocity in the wake of the airfoil to compute the mean streamwise force acting on the airfoil at different frequencies of oscillation.

The vortex characteristics obtained from the model as. near wake characteristics of a wind turbine model subjected to surge, heave, and pitch motions. The experimental study was performed in a large-scale atmospheric boundary layer wind tunnel with a scaled three-blade Horizontal Axial Wind Turbine model placed in a turbulent boundary layer airflow with similar mean and turbulence characteristics as.

THE EFFECTS OF THE CHARACTERISTICS OF THE ONCOMING WIND ON THE FLOW BEHIND A TWO-DIMENSIONAL MODEL BUILDING Y. OGAWA*, P. DIOSEY* and S. OIKAWA** ·National Institute for Environmental Studies, Japan **Shimizu Construction Co., Ltd., Tokyo, Japan SUMMARY Scale-model field and wind tunnel experiments were conducted to examine the inflow and similarity Author: Y.

Ogawa, P.G. Diosey, S. Oikawa. Sep 02,  · Abstract. The aeromechanic performance and wake characteristics of a novel twin-rotor wind turbine (TRWT) design, which has an extra set of smaller, auxiliary rotor blades appended in front of the main rotor, was evaluated experimentally, in comparison with those of a conventional single-rotor wind turbine (SRWT) by: Full text of "Hydraulic research in the United States and Canada, " See other formats.

Full-scale study of the behavior of tall buildings under winds T. Kijewski and A. Kareem NatHaz Modeling Laboratory, Department of Civil Engineering and Geological Sciences, University of. transverse) vibration, is estimated by solving a Reduced methods” for performance-based design of tall buildings against high winds.

Comparison of various reduced-order models to analyze the wind-induced response The reduced-order model is derived from the standard. Flow and Turbulence Structures in the Wake of a Simplified Car Model (Ahmed Model) H.

Lienhart, C. Stoots, S. Becker several transverse planes in the wake. Profiles of higher-order statistical moments within the wake of the 25° Ahmed body. Mean velocity vectors and profiles of turbulent kinetic energy (TKE) for comparison of wake characteristics of model and prototype buildings in transverse winds book symmetry plane.

In a building whose structural system consists of columns, beams, and floor and roof slabs, the columns are spaced at 40ft on center in one direction and 25ft on center in the other direction. what is the tributary area for a corner column.

In the past few decades, high-rise buildings have received a renewed interest in many city business locations, where land is scarce, as per their economics, sustainability, and other benefits. Taller and taller towers are being built everywhere in the world.

However, the increased frequency of multihazard disasters makes it challenging to balance between a resilient and sustainable by: In this paper, the results of analysis related to the observation on the response of the large scale bridge model to natural wind are introduced.

The prototype of the model is the proposed Honshu-Shikoku Bridge. More than records of the wind characteristics. Mar 06,  · The wake meandering characteristics of four different wind turbine designs with diameters ranging from a few centimetres (wind tunnel scale) to a hundred metres (utility scale) are investigated using large-eddy simulation with the turbine blades and nacelle parametrised using a Cited by: The classical usually defines properties and prototype defines characteristics.

Which of the following best describes the difference between the classical model of concepts and the prototype model. Find and frame the the problem a young clockmaker, resolved to rise at 4 am every morning.

This resolution to wake up before sunrise each. However, little attention has been paid to investigate tornado force on dome buildings; hence, further research is conducted in this study. The forces on a dome, cube and prisms were analyzed and compared using Computational Fluid Dynamics (CFD) for tornadic and SL winds.

One typical tornado parameter was considered for Majdi A. Yousef. Jul 07,  · In the planning of tall buildings it is suggested that preliminary design planning must be checked and analysed against several earthquakes.

Dynamic analysis is performed using a rigorous vibration model in conjunction with structural stiff-ness. A series of computer programs were developed (FAPP I to FAPP IV) for steel structures.

similitude and model investigation Dr. Sanghamitra Kundu. Introduction A model and prototype are geometric similar if and only if all body dimension in all three coordinates have the same linear scale ratio.

The drag characteristics of a torpedo are to be studied in a. May 01,  · In addition to measuring the pressure distributions and resultant wind loads acting on the building model, a digital Particle Image Velocimetry system was used to conduct detailed flow field measurements to quantify the evolution of the unsteady vortices and turbulent flow structures around the gable-roof building model in tornado-like by: Ship Construction And Design Objective Paper.

24) When the longitudinal strength members of a vessel are continuous and closely spaced, the vessel is _____.

A) transversely framed B) longitudinally framed C) intermittently framed D) web framed Answer-B. FLUCTUATING WIND VELOCITY CHARACTERISTICS OF THE WAKE OF A CONICAL HILL THAT CAUSE LARGE HORIZONTAL acteristics acting on a simplified bridge model in the wake of a conical hill were studied.

Similar study has been presented by the authors [2] before, but the data presented in this paper and w-components of the fluctuating velocity were. Dec 13,  · Structural features resulting from the interaction of a turbulent jet issuing transversely into a uniform stream are described with the help of flow visualization and hot-wire anemometry.

Jet-to-crossflow velocity ratios from 2 to 10 were investigated at crossflow Reynolds numbers from to In particular, the origin and formation of the vortices in the wake are.

AIRLOADS AND WAKE GEOMETRY CALCULATIONS FOR AN ISOLATED TILTROTOR MODEL IN A WIND TUNNEL Wayne Johnson Army/NASA Rotorcraft Division NASA Ames Research Center Moffett Field, California Comparisons of measured and calculated aerodynamic behavior of a tiltrotor model are presented. The test of the Tilt Rotor Aeroacoustic Model (TRAM) with a.

The creative design of weather vanes, which indicate wind direction, is an old, old art, dating back at least years on church steeples, for example.A few are shown here, starting with the classic chicken. Sailing and nature themes are common, but unique designs can be.

-Wake meandering is the large scale movement of the entire wake due to eddies that are large in comparison with the size of the wake itself. -According to the Dynamic Wake Meandering Model, Larsen et al., this wake meandering mechanism will not only increase the (apparent).

"An investigation was made of the aerodynamic effects of reflexing the trailing edge of three commonly used airfoils. Six airfoils were used in the investigation: three having the normal profiles of the Navy 60, the Boeingand the Gottingenand three having these profiles modified to obtain a reflexed trailing edge with the mean camber line changed to give Cmc/ George L Defoe.

the jet vortex wake of the aerial tanker, in which case additional aerodynamic forces and moments acting on the receiver do emerge. The paper developed a mathematical model of aerodynamic characteristics of aircraft in jet vortex wake based on the set of aircraft flow-around calculation programs and wake flows.

Computational Fluid Dynamics and Physical Model Comparisons of Wind Loads (,). In general, the requirements are that the model and prototype be geometrically similar, that the approach mean velocity at the building site have a vertical profile shape similar to the full-scale flow, that the turbulence characteristics of the flows be.

Scaling impacted structures when the prototype and the model are made of different materials Marcı´lio Alves *, Roberto Eiki Oshiro Group of Solid Mechanics and Structural Impact, Department of Mechatronics and Mechanical Systems Engineering. JOSEPH WILLIAM ISHERWOOD.

a ship built after the ordinary transverse method was weak in the longitudinal direction, and he set himself the task of remedying this, ultimately evolving a system. Numerical simulation of wind characteristics in the wake LoginCited by: 9.

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