Author: S.-W. KimPublisher:
ISBN:
Category : Fluid mechanics
Languages : en
Pages : 44
Book Description
Numerical Investigation of an Internal Layer in Turbulent Flow Over a Curved Hill
Author: S.-W. KimPublisher:
ISBN:
Category : Fluid mechanics
Languages : en
Pages : 44
Book Description
Numerical Investigation of an Internal Layer in Turbulent Flow Over a Curved Hill
Author: S. W. KimPublisher:
ISBN:
Category : Fluid mechanics
Languages : en
Pages : 44
Book Description
Numerical Investigation of an Internal Layer in Turbulent Flow Over a Curved Hill
Author: National Aeronautics and Space Administration (NASA)Publisher: Createspace Independent Publishing Platform
ISBN: 9781722423513
Category :
Languages : en
Pages : 42
Book Description
The development of an internal layer in a turbulent boundary layer flow over a curved hill is investigated numerically. The turbulence field of the boundary layer flow over the curved hill is compared with that of a turbulent flow over a symmetric airfoil (which has the same geometry as the curved hill except that the leading and trailing edge plates were removed) to study the influence of the strongly curved surface on the turbulence field. The turbulent flow equations are solved by a control-volume based finite difference method. The turbulence is described by a multiple-time-scale turbulence model supplemented with a near-wall turbulence model. Computational results for the mean flow field (pressure distributions on the walls, wall shearing stresses and mean velocity profiles), the turbulence structure (Reynolds stress and turbulent kinetic energy profiles), and the integral parameters (displacement and momentum thicknesses) compared favorably with the measured data. Computational results show that the internal layer is a strong turbulence field which is developed beneath the external boundary layer and is located very close to the wall. Development of the internal layer was more obviously observed in the Reynolds stress profiles and in the turbulent kinetic energy profiles than in the mean velocity profiles. In this regard, the internal layers is significantly different from wall-bounded simple shear layers in which the mean velocity profile characterizes the boundary layer most distinguishably. Development of such an internal layer, characterized by an intense turbulence field, is attributed to the enormous mean flow strain rate caused by the streamline curvature and the strong pressure gradient. In the turbulent flow over the curved hill, the internal layer begin to form near the forward corner of the hill, merges with the external boundary layer, and develops into a new fully turbulent boundary layer as the fluid flows in the downstream direction. For the flo...
Monthly Catalog of United States Government Publications
Author: Publisher:
ISBN:
Category : Government publications
Languages : en
Pages : 1200
Book Description
Monthly Catalogue, United States Public Documents
Author: Publisher:
ISBN:
Category : Government publications
Languages : en
Pages : 1644
Book Description
Scientific and Technical Aerospace Reports
Author: Administrative Notes
Author: Publisher:
ISBN:
Category : Legal deposit of books, etc
Languages : en
Pages : 538
Book Description
Previews of Heat and Mass Transfer
Author: Engineering Turbulence Modelling and Experiments - 2
Author: F. MartelliPublisher: Elsevier
ISBN: 1483298558
Category : Technology & Engineering
Languages : en
Pages : 1012
Book Description
Today understanding turbulence is one of the key issues in tackling flow problems in engineering. Powerful computers and numerical methods are now available for solving flow equations, but the simulation of turbulence effects, which are nearly always important in practice, are still at an early stage of development. Successful simulation of turbulence requires the understanding of the complex physical phenomena involved and suitable models for describing the turbulence momentum, heat and mass transfer. The 89 papers, including 5 invited papers, in this volume present and discuss new developments in the area of turbulence modelling and measurements, with particular emphasis on engineering-related problems. The high standard of the contributions on the developing and testing of turbulent models attests to the world-wide interest this domain is currently attracting from researchers.
Author: