Development of Wind Tunnels for Physical Modelling of the Atmospheric Boundary Layer (ABL) PDF Download
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Author: Jack E. Cermak
Publisher:
ISBN:
Category : Wind tunnels
Languages : en
Pages : 25
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Book Description
Presents the evolution of physical-modeling techniques to simulate wind and wind effects. Characteristics of atmospheric boundary layers (ABLs) are reviewed and features that require modeling for wind-engineering applications are defined. Similarity criteria are presented for "exact" similarity and necessary approximations are discussed. Special features of wind tunnels needed to achieve the modeling requirements are identified. Comparisons are made of data measured in the field and in a boundary-layer wind tunnel. Wind tunnels with special capabilities for modeling the ABL are described.
Author: Jack E. Cermak
Publisher:
ISBN:
Category : Wind tunnels
Languages : en
Pages : 25
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Book Description
Presents the evolution of physical-modeling techniques to simulate wind and wind effects. Characteristics of atmospheric boundary layers (ABLs) are reviewed and features that require modeling for wind-engineering applications are defined. Similarity criteria are presented for "exact" similarity and necessary approximations are discussed. Special features of wind tunnels needed to achieve the modeling requirements are identified. Comparisons are made of data measured in the field and in a boundary-layer wind tunnel. Wind tunnels with special capabilities for modeling the ABL are described.
Author: Nicholas Jon Spencer-Berger
Publisher:
ISBN:
Category :
Languages : en
Pages : 104
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Book Description
Iowa State University researchers are in the process of developing a new wind tunnel. This tunnel will be able to perform a wide range of tests. It will not only be used in an aerodynamic (Aero) test section configuration, but also in an atmospheric boundary layer (ABL) type configuration. It will be able to create a model of the turbulent boundary layer that all structures in the atmosphere are submersed in. The tunnel is designed to utilize both closed return as well as open return tunnel configurations. This will enable the tunnel to reap the benefits of both types of tunnels. Currently most of the ABL studies rely on the assumption that atmospheric velocity variations are adequately modeled by stationary mean and turbulent flow properties. The ISU Aero/ABL tunnel will be able to develop non-stationary flows to help better study and understand this type of phenomena. The primary concern and area of research reported here has been to develop this non-stationary flow device by modeling and testing the design. The results shown reflect that a 107% gust can be achieved by the model, but with some changes to the design, a higher magnitude gust can be achieved.
Author: Justin D. Pereira
Publisher: Nova Science Publishers
ISBN: 9781612092041
Category : Aerodynamics
Languages : en
Pages : 0
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Book Description
This book presents current research in the study of wind tunnels, including the design, execution and numerical rebuilding of a plasma wind tunnel with the aim to analyse shock wave boundary layer interaction phenomena; the Mainz vertical wind tunnel facility experimenting on cloud physics and chemistry; an air-conditioned wind tunnel environment for the study of mass and heat flux; using wind tunnel studies to evaluate the drag coefficient of the tree crown and Pre-X aerodynamic/aerothermal characterisation through computational fluid dynamics and wind tunnels.
Author: Fredric A. Godshall
Publisher:
ISBN:
Category : Boundary layer (Meteorology)
Languages : en
Pages : 214
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Book Description
Author: National Research Council
Publisher: National Academies Press
ISBN: 0309044499
Category : Education
Languages : en
Pages : 145
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Book Description
This book assesses wind engineering research studies in the past two decades to identify an interdisciplinary research agenda and delineate an action plan for evaluation of critical wind engineering efforts. It promotes the interdisciplinary approach to achieve collaborative research, assesses the feasibility of formalizing undergraduate wind engineering curricula, and assesses international wind engineering research activities and transfer approaches for U.S. applications.
Author: Maximillian Hobson-Dupont
Publisher:
ISBN:
Category : Boundary layer (Meteorology)
Languages : en
Pages : 74
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Book Description
There has been much success in atmospheric boundary layer simulation with medium sized closed-circuit wind tunnels with test section dimensions of approximately 1 x 1 m. However, smaller, blower-type wind tunnels are more common in university laboratories due to the lower cost and smaller space requirements. A small size, open flow wind tunnel with a 1 x 1 foot test section was modified to simulate the atmospheric boundary layer with a combination of upstream spires and cubic roughness elements. The primitive spire geometry detailed in the literature was found to yield poor agreement with the power law velocity profile of interest, and a novel iterative algorithm was developed to produce nonlinear spire geometry. The geometry generated by the algorithm was tested in the wind tunnel and found to simulate the desired velocity profile based on a Hellman exponent of 0.20 with a high degree of agreement, having a maximum velocity error of 4%. This confirmed the suitability of small-sized wind tunnels for simulating the atmospheric boundary layer.
Author: Joseph William Wilson
Publisher:
ISBN:
Category :
Languages : en
Pages : 256
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Book Description
Author: Donald Cyril Bain
Publisher:
ISBN:
Category : Science
Languages : en
Pages : 176
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Book Description
Author:
Publisher:
ISBN:
Category : Industries
Languages : en
Pages : 592
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Book Description
Author: Noor Ahmed
Publisher: BoD – Books on Demand
ISBN: 9535110470
Category : Science
Languages : en
Pages : 232
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Book Description
This book is intended to be a valuable addition to students, engineers, scientists, industrialists, consultants and others providing greater insight into wind tunnel designs and their enormous research potential. It is a compilation of works from world experts on subsonic and supersonic wind tunnel designs, applicable to a diverse range of disciplines. The book is organised in two sections. The first section comprises of three chapters on various aspects of stationary and portable subsonic wind tunnel designs, followed by one chapter on supersonic wind tunnel and the final chapter discusses a method to address unsteadiness effects of fan blade rotation. The second section contains four chapters regarding wind tunnel applications across a multitude of engineering fields including civil, mechanical, chemical and environmental engineering.
