Last edited by Tygojin
Saturday, August 1, 2020 | History

3 edition of Numerical studies of laminar and turbulent drag reduction found in the catalog.

Numerical studies of laminar and turbulent drag reduction

R. Balasubramanian

# Numerical studies of laminar and turbulent drag reduction

## by R. Balasubramanian

Subjects:
• Laminar flow -- Data processing,
• Turbulence -- Data processing

• Edition Notes

The Physical Object ID Numbers Statement R. Balasubramanian and S.A. Orszag ; prepared for Langley Research Center under contract NAS1-16722 Series NASA contractor report -- 3669 Contributions Orszag, Steven A, United States. National Aeronautics and Space Administration. Scientific and Technical Information Branch, Langley Research Center Pagination v, 83 p. : Number of Pages 83 Open Library OL14931149M

By using laminar separation bubble, and turbulent model, an increase in a Reynolds number we found that there is a rapid reduction in drag force and increases in lift force [5]. By doing experiment on a circular cylinder the investigation of vortex induced vibrations with Low damping ratio gives the idea that there is a change in velocity [6].Author: Shivam Yadav, Akshaj Kulshreshtha, Baij Nath Singh. This book is an introduction to computational fluid dynamics with emphasis on the modeling and calculation of boundary-layer flows. The subjects coverd include laminar, transitional and turbulent boundary layers for two- and three-dimensional incompressible flows.

The Collected Aircraft Performance Improvement Articles and Lectures of Bruce Carmichael 1st Printing 14 articles. Oshkosh Appraisal, Laminar Wing & Fuselage Design, Propeller Place, Performance Revolution and Improvement, AR-5 & VMax Probe Study, 7 Lectures on Drag Fundamentals, Body Drag, Realm of Reynolds Lam., Aircraft Search, Lam Aircraft . This book describes methods that reveal its structures and dynamics. Building on the existence of coherent structures – recurrent patterns – in turbulent flows, it describes mathematical methods that reduce the governing (Navier–Stokes) equations to simpler forms that can be understood more : Philip Holmes, John L. Lumley, Gahl Berkooz, Clarence W. Rowley.

Aerodynamics, Turbulent Flows, Active Flow Control Particle Image Velocimetry,Polymer Additives for Turbulent Drag Reduction, Superhydrophobic Surfaces for Turbulent Drag Reduction, Particle-Laden Flows (Slurry Flows), Particle Image Velocimetry. Other Research Areas: Energy and Environment: Arman Hemmati. Assistant Professor. Phone: () DNS of turbulent drag reduction in a pressure-driven rod-roughened channel flow by microfiber additives. Journal of Non-Newtonian Fluid Mechanics , () Numerical study of turbulent flow in asymmetrically heated horizontal by:

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### Numerical studies of laminar and turbulent drag reduction by R. Balasubramanian Download PDF EPUB FB2

Numerical studies of laminar and turbulent drag reduction. Washington, D.C.: National Aeronautics and Space Administration, Scientific and Technical Information Branch ; [Springfield, Va.: For sale by the National Technical Information Service],   The largest drag reduction results from the use of trapezoidal grooves and the smallest results from the use of triangular grooves for the range of parameters considered in this work.

Placing the same grooves on both walls increases the drag reduction by up to four times when comparing with grooves on one wall by: Drag Reduction by Laminar Flow Control Nils Beck 1, *, Tim Landa 2, Arne Seitz 3, Loek Boermans 4, Y aolong Liu 1 ID and Rolf Radespiel 2 1 Aeronautics Research Center Niedersachsen (NFL), TU.

For turbulent flows, while numerical studies have shown definite drag reduction and brought insights into the drag-reducing mechanism [9][10][11][12], experimental studies have reported mixed.

Abstract. This paper presents results from a series of numerical studies of various geometry riblets in both laminar and turbulent external flows, which complement results already reported by colleagues at IMST, ONERA-CERT, and UMIST, for V and L-groove riblets in laminar internal and external by:   Numerical Study of Thermophoretic Deposition in Laminar and Turbulent Variable-Property Flat Plate Channel Flow Shinn, A.

F., and Vanka, S. "Numerical Study of Thermophoretic Deposition in Laminar and Turbulent Variable-Property Flat Plate Channel Flow." Boundary Layer Studies on Polymer Drag Reduction Using PIV and : M.

Goodwin, A. Shinn, Surya Pratap Vanka. Abstract. Nature has created ways of reducing drag in fluid flow, evident in the efficient movement of fish, dolphins, and sharks.

The mucus secreted by fish reduces drag as they move through water, protects the fish from abrasion by making the fish slide across objects rather than scrape, and prevents disease by making the surface of the fish difficult for microscopic organisms to adhere to Cited by: 5.

The thickening of the buffer layer was confirmed by experimental and numerical studies by Ptasinski (). The laminar–turbulent transition is strongly influenced by the elastic properties of the fluid. Methods of retarding this transition will be discussed later in connection with turbulent drag reduction.

Suggested Citation:"Numerical Study on Propulsion by Undulating Motion in Laminar-Turbulent Flow."National Research Council. Twenty-Fourth Symposium on Naval gton, DC: The National Academies Press.

doi: / Laminar vortex shedding (L3) regime. The measurement data show that beyond a critical Reynolds number of ab the steady closed near wake becomes unstable and a transverse oscillation starts near the end of the wake.

As the Re is increased further, the vortices are shed alternately from the upper and lower cylinder surface at a definite frequency depending on the Reynolds by: Trove: Find and get Australian resources.

Books, images, historic newspapers, maps, archives and more. Abstract: Description. This volume authoritatively treats viscous drag reduction in four major categories--laminar flow control, passive turbulent drag reduction, active turbulent drag reduction, and interactive turbulent drag reduction--and presents emerging technologies, such as the use of surfactants, as an alternative to polymers.

These technologies can be associated to maximize the drag reduction. Future laminar flow aircraft can, for example, be fitted with wing tip devices and equipped with riblets in the rear part of the wing upper surface.

Several other turbulent drag reduction techniques can. TURBULENT PIPE FLOW WITH POLYMER ADDITIVES where η s is the solvent (water) viscosity and e ij the rate-of-deformation tensor. The well-known Reynolds decomposition is used for the velocity vector u i = (u x,u r,u θ), the pressure p and the polymeric stress τ p,ij, in which lower case with a prime denotes a ﬂuctuation and upper case denotes a mean value (alterna.

♥ Book Title: Laminar-Turbulent Transition ♣ Name Author: H.F. Fasel ∞ Launching: Info ISBN Link: ⊗ Detail ISBN code: ⊕ Number Pages: Total sheet ♮ News id: p-mf8VnNA54C Download File Start Reading ☯ Full Synopsis: "The origins of turbulent flow and the transition from laminar to turbulent flow are among the most important unsolved.

The papers are not reviews of particular areas of drag reduction per se, but represent summary reports of current research in promising approaches, of continuing fundamental studies of turbulent flows, and of attempts towards practical implementation of laboratory proven ideas.

They were presented at the Symposium on Viscous Drag Reduction held. @article{osti_, title = {Microbubble drag reduction in liquid turbulent boundary layers}, author = {Merkle, C L and Deutsch, S}, abstractNote = {The interactions between a dense cloud of small bubbles and a liquid turbulent boundary layer are reviewed on the basis of available experimental observations to understand and quantify their capability for reducing skin friction.

The direct numerical simulations show that large-scale passive streamwise wall fluctuations can reduce friction drag by at least $\pm 1\,\%$, whereas even small-scale passive spanwise wall motions lead to considerable drag penalty.

It is found that a well-designed compliant wall can theoretically exploit the drag-reduction mechanism of an Cited by: 4. COVID Resources. Reliable information about the coronavirus (COVID) is available from the World Health Organization (current situation, international travel).Numerous and frequently-updated resource results are available from this ’s WebJunction has pulled together information and resources to assist library staff as they consider how to handle coronavirus.

Water-soluble polymers with high molecular weights are known to decrease the frictional drag in turbulent flow very effectively at concentrations of tens or hundreds of ppm. This drag reduction efficiency of water-soluble polymers is well known to be closely associated with the flow conditions and rheological, physical, and/or chemical characteristics of the polymers by:.

The frictional drag in turbulent flow can be drastically reduced by the addition of minute amounts of suitable linear flexible high-molecular-weight polymers, and the various physical characteristics of the polymers used are known to be closely related to the drag reduction efficiency.

This feature article briefly reviews polymer additives and factors in the system affecting turbulent drag Cited by: In fluid dynamics, turbulence or turbulent flow is fluid motion characterized by chaotic changes in pressure and flow is in contrast to a laminar flow, which occurs when a fluid flows in parallel layers, with no disruption between those layers.

Turbulence is commonly observed in everyday phenomena such as surf, fast flowing rivers, billowing storm clouds, or smoke from a chimney.The full text of this article hosted at is unavailable due to technical by: