A Parametric Study of Unsteady Viscous Flow
Author | : Bertha M. Ryan |
Publisher | : |
Total Pages | : 154 |
Release | : 1955 |
Genre | : |
ISBN | : |
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Author | : Bertha M. Ryan |
Publisher | : |
Total Pages | : 154 |
Release | : 1955 |
Genre | : |
ISBN | : |
Author | : Marten Landahl |
Publisher | : |
Total Pages | : 188 |
Release | : 1955 |
Genre | : Viscous flow |
ISBN | : |
Author | : Demetri P. Telionis |
Publisher | : Springer Science & Business Media |
Total Pages | : 429 |
Release | : 2012-12-06 |
Genre | : Science |
ISBN | : 3642885675 |
Most of the fundamental concepts of unsteady viscous flows have been known since the early part of the century. However, the past decade has seen an unprecedented number of publications in this area. In this monograph I try to connect materials of earlier contributions and synthesize them into a comprehensive entity. One of the main purposes of a monograph, in my opinion, is to fit together in a comprehensive way scattered contributions that provide fragmented information to the readers. The collection of such contributions should be presented in a unified way; continuity of thought and logical sequence of the presentation of ideas and methods are essential. The reader should be able to follow through without having to resort to other references, something that is unavoidable in the case of a research paper or even a review paper. Many of the solutions discussed in the literature address specific practical problems. In fact, in the process of collecting information, I discovered independent lines of investigations, dealing with the same physical problem, but inspired by different practical applications. For example, I found that two groups of investigators have been studying independently the response of a viscous layer to a harmonic external disturbance. One group is con cerned with mass transport and the transport of sediment over the bottom of the ocean, and the other is interested in the aerodynamics of lifting surfaces in harmonically changing environments.
Author | : Ahmer Mehmood |
Publisher | : Springer |
Total Pages | : 205 |
Release | : 2017-04-22 |
Genre | : Technology & Engineering |
ISBN | : 3319554328 |
This authored monograph provides a detailed discussion of the boundary layer flow due to a moving plate. The topical focus lies on the 2- and 3-dimensional case, considering axially symmetric and unsteady flows. The author derives a criterion for the self-similar and non-similar flow, and the turbulent flow due to a stretching or shrinking sheet is also discussed. The target audience primarily comprises research experts in the field of boundary layer flow, but the book will also be beneficial for graduate students.
Author | : Shashi Moorty |
Publisher | : |
Total Pages | : 252 |
Release | : 1987 |
Genre | : Viscous flow |
ISBN | : |
Author | : Theodore Bratanow |
Publisher | : |
Total Pages | : 44 |
Release | : 1978 |
Genre | : Finite element method |
ISBN | : |
Author | : Don J. Wood |
Publisher | : |
Total Pages | : 60 |
Release | : 1965 |
Genre | : Airplanes |
ISBN | : |
Author | : P.K. Banerjee |
Publisher | : CRC Press |
Total Pages | : 368 |
Release | : 1990-05-31 |
Genre | : Science |
ISBN | : 1482296551 |
This volume demonstrates that boundary element methods are both elegant and efficient in their application to time dependent time harmonic problems in engineering and therefore worthy of considerable development.
Author | : Araz Panahi |
Publisher | : |
Total Pages | : |
Release | : 2019 |
Genre | : |
ISBN | : |
"This thesis presents a deep analysis of the steady and unsteady viscous flows past airfoils and three-dimensional wings, and of three-dimensional confined flows at low Reynolds numbers. This research work was carried out in several cases studies: (i) steady and unsteady confined viscous flows; (ii) unsteady separations effects on the flow past stationary airfoils; (iii) effect of the ground proximity on the steady and unsteady viscous flows past oscillating and fixed airfoils; (iv) three-dimensional steady flows past wings at low Reynolds numbers. The first part presents an efficient numerical method to solve three-dimensional steady and unsteady flows in a three-dimensional downstream-facing step channel at low Reynolds numbers. A finite-difference formulation and artificial compressibility were used on a stretched staggered grid for the solution of the Navier-Stokes equations, which is second-order accurate in space and time. The results were found to be in good agreement with the available experimental results. For the first time it was confirmed that the difference between the two-dimensional numerical solutions and the experimental results was due to the effect of the lateral walls in the experimental configuration.The second part is the study of the unsteady effects on stationary airfoils due to unsteady flow separations at low Reynolds numbers. This study was performed with an efficient time-accurate numerical method using a pseudo-time relaxation procedure with artificial compressibility and a factored Alternate-Direction Implicit (ADI) scheme for the pseudo-time integration. The method is successfully validated by comparison with the experimental results obtained by Suwa et al. for triangular airfoils at low Reynolds numbers. It was found that the aerodynamic coefficients of lift and drag displayed periodic variations in time due to the unsteady flow separations occurring at low Reynolds numbers on stationary airfoils at relatively small angles of attack.Analysis of the steady and unsteady flows over airfoils in the proximity of the ground was studied in the third part. Various flight evolutions of the micro-air-vehicles take place in the proximity of the ground or a ceiling, which require the aerodynamic solutions in these conditions at low Reynolds numbers. Solutions are presented for the unsteady lift and drag coefficients of several NACA airfoils in the proximity of the ground. A detailed study of the influence of various geometric and flow parameters, such as the angle of attack, airfoil relative thickness, amplitude and frequency of oscillations and Reynolds number, on the flow separations in the proximity of the ground were carried out in this part. This study also presented the analysis of the unsteady flows past stationary airfoils in the proximity of the ground, aiming to determine the influence of the distance to the ground on these unsteady effects which are generated by the unsteady flow separations on the stationary airfoils at low Reynolds numbers. It was found that these unsteady effects appear at lower angles of attack for the airfoils in the proximity of the ground than in free flight.The fourth and final case study is the three-dimensional analysis of the steady viscous flows past rectangular wings with various NACA airfoil sections at low Reynolds numbers. The solutions are obtained using an efficient numerical method to solve the Navier-Stokes equations for incompressible flows. The numerical solutions of the aerodynamic lift and drag coefficients obtained by this method are validated with the experimental results obtained by Sunada et al. for rectangular wings. A parametric study of the influence of various geometric and flow parameters, such as wing thickness, wing airfoil camber, angle of attack and Reynolds number is also presented." --
Author | : United States. Air Force. Office of Scientific Research |
Publisher | : |
Total Pages | : 1190 |
Release | : 1950 |
Genre | : Research |
ISBN | : |