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Monday, May 11, 2020 | History

4 edition of The effects of curvature on the turbulent boundary layer found in the catalog.

The effects of curvature on the turbulent boundary layer

V. C. Patel

The effects of curvature on the turbulent boundary layer

by V. C. Patel

  • 49 Want to read
  • 40 Currently reading

Published by H.M.S.O. in London .
Written in English

    Subjects:
  • Turbulent boundary layer.,
  • Curvature.

  • Edition Notes

    Statementby V. C. Patel.
    SeriesAeronautical Research Council. Reports and memoranda, no. 3599, Reports and memoranda (Aeronautical Research Council (Great Britain)) ;, no. 3599.
    Classifications
    LC ClassificationsTL526.G7 A4 no. 3599
    The Physical Object
    Pagination[1], 31 p.
    Number of Pages31
    ID Numbers
    Open LibraryOL4652604M
    ISBN 100114702004
    LC Control Number77491861
    OCLC/WorldCa811686

      Boundary layers are building up on both solid surfaces and separation occurs in the corner region farther downmstream of the l.e region. I am using a 3d solver for compressible flow with the Wilcox k-omega turbulence model. 1. I. Tani, “ Production of longitudinal vortices in the boundary layer along a curved wall,” J. 67, ().Google Scholar Crossref; 2. H. Bippes, “Experimental study of the laminar-turbulent transition on a concave wall in a parallel flow,” NASA TM, Cited by:

    The Symposium on structure of Complex turbulent shear flows was proposed by the "Comite National Fran. The Effects of Concave Curvature on Turbulent Boundary Layer Structure. Pages Jeans, A. H. (et al.) Turbulent Flow and the Effects of Curvature. External turbulent flows are those in which the turbulent region is significantly affected by at most one wall. A brief survey of some general turbulent shear flow configurations is presented and two-dimensional boundary layers at small Mach numbers are considered. Attention is given to the multilayer model of turbulent boundary layers, self-preserving shear layers, relaxation effects and.

    Dimensionless velocity data from a wide variety of turbulent duct and boundary-layer flows are shown here: where y is the normal distance from the wall For equilibrium turbulent boundary layers, wall-adjacent cells in the log-law region have known velocity and wall shear stress data Wall shear ρ stress τ τ = U w ν y+ =yUτ τ + = U u uFile Size: 1MB. Also discussed are the effects of high free-stream turbulence on heat transfer in turbulent boundary layer, wave interaction and stability problems, the modeling of unsteady boundary layers, and the transport of enstrophy in a turbulent boundary layer.


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The effects of curvature on the turbulent boundary layer by V. C. Patel Download PDF EPUB FB2

Summary. This paper reports the results of flow visualization studies on the structure of turbulent boundary layers over concave walls.

A flat plate turbulent boundary layer was grown on one wall of a straight, large water channel and then passed over a concave by: 8. Effects of streamline curvature on turbulent flow. [Neuilly-sur-Seine, France] North Atlantic Treaty Organization, Advisory Group for Aerospace Research and Development.

[] (OCoLC) Document Type: Book: All Authors / Contributors: A D Young; Bradshaw, Peter.; North Atlantic Treaty Organization. Advisory Group for Aerospace Research. Stabilizing, destabilizing, and secondary flow effects of streamline curvature on laminar and turbulent wakes behind a circular cylinder have been examined qualitatively and quantitatively.

Experiments were carried out using a flow visualization method, a hot-wire anemometer and a signal by: 8. Effects of convex wall curvature on turbulent boundary layer flow are studied in this article using a numerical method.

Since the non-linear k−ε model often used in engineering applications. Tuncer Cebeci, in Analysis of Turbulent Flows with Computer Programs (Third Edition), Effect of Transverse Curvature. First-order boundary-layer theory is based on the assumption that the boundary-layer thickness δ is small in comparison with a characteristic length are some flows for which this assumption fails.

Get this from a library. Turbulent boundary layer heat transfer experiments: convex curvature effects including introduction and recovery. [T W Simon; United States. National Aeronautics and Space Administration.; Lewis Research Center.;].

An experimental investigation has been carried out on a transitional boundary layer subject to high (initially 9%) freestream turbulence, strong acceleration (K = ν / U w 2 dU w / dx as high as 9 × 10 − 6), and strong concave curvature (boundary layer thickness between 2% and 5% of the wall radius of curvature).

Mean and fluctuating velocity as well as turbulent shear stress are documented Cited by:   Streamline curvature in the plane of the mean flow is known to exert a proportionately greater effect on the turbulent mixing processes than might be expected from inspection of the conservation equations governing the evolution of the turbulence by: 3.

Turbulent boundary layers with large streamline curvature effects This unique approach sets this book apart from its competitors and allows the instructor to adopt this book as a text and. @article{osti_, title = {Free-stream turbulence and concave curvature effects on heated, transitional boundary layers}, author = {Kim, J and Simon, T W and Russ, S G}, abstractNote = {An experimental investigation of transition in concave-curved boundary layers at two free-stream turbulence levels ( and percent) was performed.

The effects of convex curvature on boundary layer transition were examined experimentally in low and high free-stream turbulence, and in zero and favorable pressure gradients. For high turbulence with zero pressure gradient, transition along convex surfaces was found to be similar to that on flat surfaces, however at low turbulence levels Author: B.J.

Abu-Ghannam, H.H. Nigim, P. Kavanagh. the flow near the wall makes turbulent boundary layers more resistant to flow separation. • The photographs depict the flow over a strongly curved surface, where there exists a strong adverse (positive) pressure gradient.

• The boundary layer has a high momentum deficit. • In the case where the boundary layer is laminar, insufficient momentumFile Size: 1MB. Boundary layers for axisymmetric configurations are important in aeronautics, in the area of machine construction, and in industrial processing engineering.

A significant effect of the lateral curvature on the boundary layer can be noticeable in the case of an aircraft fuselage and a long fiber. The basic mathematical relations regarding the curvature effects are considered, taking into Author: H.

Fernholz, T. Podtschaske. We revisit the problem of a spatially developing turbulent boundary layer over a concave surface. Unlike previous investigations, we simulate the combined effects of streamline curvature as well as curvature-induced pressure gradients on the turbulence. Our focus is on investigating the response of the turbulent boundary layer to the sudden onset of curvature and the destabilising influence of Cited by: 5.

Book: Effect of transverse convex surface curvature on fluid flow and heat transfer for turbulent boundary layer flow longitudinal to a circular cylinder: Analysis and experiment. In Osborne Reynolds demonstrated the transition to turbulent flow in a classic experiment in which he examined the behaviour of water flow under different flow rates using a small jet of dyed water introduced into the centre of flow in a larger pipe.

The larger pipe was glass, so the behaviour of the layer of dyed flow could be observed, and at the end of this pipe was a flow-control. The mechanism of the turbulent motion is influenced by the density stratification, which is stable under the action of centrifugal acceleration in a boundary layer over a convex wall.

On a concave wall the density stratification is unstable near the surface and stable farther away from it. The contribution of centrifugal and Coriolis forces to the turbulent energy production is by: Turbulent boundary layer heat transfer experiments: convex curvature effects including introduction and recovery / (Washington.

D.C. National Aeronautics and Space Administration, Scientific and Technical Information Branch ; [Springfield, Va. / Turbulent transport measurements in a heated boundary layer: Combined effects of free-stream turbulence and removal of concave curvature. Heat Transfer; Electric Power; Industrial and Cogeneration.

American Society of Mechanical Engineers (ASME), (Proceedings of the ASME Turbo Expo).Author: Michael D. Kestoras, Terrence W. Simon. conditions (e.g. roughness), and boundary-layer response • Receptivity has many different paths through which to introduce disturbances into boundary layer.

Among these, interaction of freestream sound or vorticity with – leading-edge curvature – discontinuities in. Full text of "Effects of turbulence stimulators on the boundary layer and resistance of a ship model as detected by hot wires" See other formats 7*Y NAVY DEPARTMENT THE DAVID W.

TAYLOR MODEL BASIN Washington 7, D.C. EFFECTS OF TURBULENCE STIMULATORS ON THE BOUNDARY LAYER AND RESISTANCE OF A SHIP MODEL AS DETECTED BY HOT WIRES by John P.

Breslin and .The Proceedings: Fifth International Conference on Numerical Ship Hydrodynamics () Chapter: Some Numerical Computations about Free Surface Boundary Layer and Surface Tension Effects on .Then the linear stability problem is expanded to include the effects of pressure gradients, flow curvature, boundary-layer separation, wall compliance, etc.

related to applications. Beyond the amplification of instability waves is the non-modal growth of local stationary and non-stationary shear flow perturbations which are discussed as : Springer Netherlands.