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Journal articles on the topic 'Boundary layer flow'

Author: Grafiati

Published: 4 June 2021

Last updated: 25 July 2025

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1

Sun, Lei, Xihuan Sun, Yongye Li, and Cheng Wang. "Experimental Study on Flow Structure Characteristics of Gap Flow Boundary Layer Based on PIV." Water 15, no. 22 (2023): 3989. http://dx.doi.org/10.3390/w15223989.

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The boundary layer is the main source of frictional resistance in gap flow, and the study of the flow structure characteristics of the gap flow boundary layer is of great significance for the study of gap flow theory. In this study, the PIV technique was utilized to experimentally investigate the gap flow boundary layers with Reynolds numbers of 16,587–56,870 and gap ratios of 0.6–0.8. The characteristics of the wall friction velocity, the boundary layer thickness, and the wall function of the gap flow boundary layer were analyzed, and the influences of the mean velocity of the gap flow and th

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2

Au, S., and P. R. Smy. "Arcs in boundary layer flow." IEE Proceedings A Physical Science, Measurement and Instrumentation, Management and Education, Reviews 135, no. 1 (1988): 69. http://dx.doi.org/10.1049/ip-a-1.1988.0010.

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3

Vranková, Andrea, and Milan Palko. "Atmospheric Boundary Layer." Applied Mechanics and Materials 820 (January 2016): 338–44. http://dx.doi.org/10.4028/www.scientific.net/amm.820.338.

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Atmospheric Boundary Layer (ABL) is the lowest part of the troposphere. The main feature of the Atmospheric Boundary Layer is the turbulent nature of the flow. The thickness of the boundary layer, formed by flowing air friction on the earth’s surface under various conditions move in quite a wide range. ABL is generally defined as being 0.5 km above the surface, although it can extend up to 2 km depending on time and location. The flow properties are most important over the surface of solid objects, which carry out all the reactions between fluid and solid.

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4

Floors, Rogier, Sven-Erik Gryning, Alfredo Peña, and Ekaterina Batchvarova. "Analysis of diabatic flow modification in the internal boundary layer." Meteorologische Zeitschrift 20, no. 6 (2011): 649–59. http://dx.doi.org/10.1127/0941-2948/2011/0290.

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5

Wu, H., Michael N. Morgan, and Bin Lin. "Investigation of the Grinding Wheel Air Boundary Layer Flow." Advanced Materials Research 76-78 (June 2009): 113–18. http://dx.doi.org/10.4028/www.scientific.net/amr.76-78.113.

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The boundary layer of air rotating with the grinding wheel can result in fluid starvation in the contact region. The boundary layer acts a barrier to fluid penetration and prevents fluid reaching the contact region and the fluid is deflected elsewhere. Such a situation is inefficient and wasteful. This work reports on an investigation of the air boundary layer aimed at increasing understanding of boundary layer for development of improved fluid delivery systems. The work reported focuses on the outcomes of experimental tests using the Laser Doppler Anemometry technique. Three velocity componen

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6

Yoshida, Yuki, Yoshiaki Takahashi, Hiroharu Kato, Akira Masuko, and Osamu Watanabe. "Simple Lagrangian formulation of bubbly flow in a turbulent boundary layer (bubbly boundary layer flow)." Journal of Marine Science and Technology 2, no. 1 (1997): 1–11. http://dx.doi.org/10.1007/bf01245932.

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7

Ramesh, O. N., J. Dey, and A. Prabhu. "Transformation of a laterally diverging boundary layer flow to a two-dimensional boundary layer flow." Zeitschrift für angewandte Mathematik und Physik 48, no. 4 (1997): 694–98. http://dx.doi.org/10.1007/s000330050057.

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8

HASEGAWA, Yutaka, Koji KIKUYAMA, Hirokazu ITO, Michio NISHIKAWA, and Ryoichi IHARA. "Study of Boundary layer Flow in Rotating Curvature system : Boundary Layer Flow on Convex Wall." Proceedings of Conference of Tokai Branch 2004.53 (2004): 327–28. http://dx.doi.org/10.1299/jsmetokai.2004.53.327.

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9

Sun, Mingbo, Yuan Liu, and Zhiwei Hu. "Turbulence decay in a supersonic boundary layer subjected to a transverse sonic jet." Journal of Fluid Mechanics 867 (March 21, 2019): 216–49. http://dx.doi.org/10.1017/jfm.2019.158.

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The turbulence state in a supersonic boundary layer subjected to a transverse sonic jet is studied by conducting direct numerical simulations. Turbulence statistics for two jet-to-cross-flow momentum flux ratios $(J)$ of 2.3 and 5.5 based on the previous simulation (Sun & Hu, J. Fluid Mech., vol. 850, 2018, pp. 551–583) are given and compared with a flat-plate boundary layer without a jet $(J=0.0)$. The instantaneous and time-averaged flow features around the transverse jet in the supersonic boundary layer are analysed. It is found that, in the near-wall region, turbulence is suppressed si

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10

Algaidy, Nasser, and Ali El Shrif. "Numerical simulation of the laminar boundary layer flow over a flat plate." مجلة الجامعة الأسمرية 8, no. 4 (2023): 122–35. http://dx.doi.org/10.59743/jau.v8i4.1935.

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Understanding the dynamic and thermal characteristics of the boundary layer (BL) flows is an essential step toward the best design and operational conditions for many engineering devices. Flow characteristics within the boundary layer are governed by two forces that are in a mutual race to dominate the flow, the viscous and inertial forces. The state of the flow is determined by the relative domination of these two forces inside the boundary layer zone. Theoretical solutions for many BL flow types existed since the beginning of the 20th century. Theoretical solutions are strictly possible for

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11

Balmforth, N. J., R. V. Craster, D. R. Hewitt, S. Hormozi, and A. Maleki. "Viscoplastic boundary layers." Journal of Fluid Mechanics 813 (January 26, 2017): 929–54. http://dx.doi.org/10.1017/jfm.2016.878.

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In the limit of a large yield stress, or equivalently at the initiation of motion, viscoplastic flows can develop narrow boundary layers that provide either surfaces of failure between rigid plugs, the lubrication between a plugged flow and a wall or buffers for regions of predominantly plastic deformation. Oldroyd (Proc. Camb. Phil. Soc., vol. 43, 1947, pp. 383–395) presented the first theoretical discussion of these viscoplastic boundary layers, offering an asymptotic reduction of the governing equations and a discussion of some model flow problems. However, the complicated nonlinear form of

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12

Xu, Dachuan, Yunsong Gu, Xinglong Gao, Zebin Ren, and Jingxiang Chen. "Experimental Investigation on Boundary Layer Control and Pressure Performance for Low Reynolds Flow with Chemical Reaction." Applied Sciences 13, no. 20 (2023): 11335. http://dx.doi.org/10.3390/app132011335.

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This study examines boundary layer control and pressure recovery in low Reynolds number supersonic flow with chemical reactions in a chemical laser system. Our work prescribes a novel boundary layer control method for the optical cavity of a chemical laser system, and a design of a supersonic diffuser is compared and proposed to make a stable flow for the system. The flow characteristics of a low Reynolds number and internal reaction heat release were analyzed. Three types of experimental pieces were designed to passively control the boundary layer in the optical cavity. An active booster-type

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13

Tanaka, Hitoshi, Nguyen Xuan Tinh, and Ahmad Sana. "Tsunami Damping due to Bottom Friction Considering Flow Regime Transition and Depth-Limitation in a Boundary Layer." Journal of Marine Science and Engineering 10, no. 10 (2022): 1433. http://dx.doi.org/10.3390/jmse10101433.

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According to recent investigations on bottom boundary layer development under tsunami, a wave boundary can be observed even at the water depth of 10 m, rather than a steady flow type boundary layer. Moreover, it has been surprisingly reported that the tsunami boundary layer remains laminar in the deep-sea area. For this reason, the bottom boundary layer under tsunami experiences two transitional processes during the wave shoaling: (1) flow regime transition in a wave-motion boundary layer from laminar to the turbulent regime, and (2) transition from non-depth-limited (wave boundary layer) to d

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14

Cloos, F. J., D. Stapp, and P. F. Pelz. "Swirl boundary layer and flow separation at the inlet of a rotating pipe." Journal of Fluid Mechanics 811 (December 12, 2016): 350–71. http://dx.doi.org/10.1017/jfm.2016.734.

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When a fluid enters a rotating circular pipe, an angular momentum or swirl boundary layer appears at the wall and interacts with the axial momentum boundary layer. In the centre of the pipe, the fluid is free of swirl and is accelerated due to boundary layer growth. Below a critical flow number, defined as the ratio of average axial velocity to circumferential velocity of the pipe, there is flow separation, known in the turbomachinery context as part load recirculation. To describe this phenomenon analytically, we extended boundary layer theory to a swirl boundary layer interacting with the ax

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15

Hara, K., M. Furukawa, and M. Inoue. "Behavior of Three-Dimensional Boundary Layers in a Radial Inflow Turbine Scroll." Journal of Turbomachinery 116, no. 3 (1994): 446–52. http://dx.doi.org/10.1115/1.2929431.

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A detailed experimental investigation was carried out to examine the three-dimensional boundary layer characteristics in a radial inflow turbine scroll. Some basic flow phenomena and growth of secondary flow were also investigated. In the inlet region of the scroll, the incoming boundary layer begins to have a skewed nature, namely the radially inward secondary flow caused by the radial pressure gradient. From the inlet region to one third of the scroll circumference, the secondary flow grows so strongly that most of the low-momentum fluid in the incoming boundary layer is transported to the n

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16

Mathews, James R., Vianney Masson, Stéphane Moreau, and Hélène Posson. "The modified Myers boundary condition for swirling flow." Journal of Fluid Mechanics 847 (May 29, 2018): 868–906. http://dx.doi.org/10.1017/jfm.2018.326.

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This paper gives a modified Myers boundary condition in swirling inviscid flow, which differs from the standard Myers boundary condition by assuming a small but non-zero boundary layer thickness. The new boundary condition is derived and is shown to have the correct quadratic error behaviour with boundary layer thickness and also to agree with previous results when the swirl is set to zero. The boundary condition is initially derived for swirling flow with constant azimuthal velocity, but easily extends to radially varying swirling flow, with terms depending on the boundary layer model. The mo

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17

BOTTARO, ALESSANDRO. "A ‘receptive’ boundary layer." Journal of Fluid Mechanics 646 (March 8, 2010): 1–4. http://dx.doi.org/10.1017/s0022112009994228.

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Receptivity is the process which describes how environmental disturbances (such as gusts, acoustic waves or wall roughness) are filtered by a boundary layer and turned into downstream-growing waves. It is closely related to the identification of initial conditions for the disturbances and requires knowledge of the characteristics of the specific external forcing field. Without such a knowledge, it makes sense to focus on worst case scenarios and search for those initial states which maximize the disturbance amplitude at a given downstream position, and hence to identify upper bounds on growth

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18

Anderson, E. J., W. R. McGillis, and M. A. Grosenbaugh. "The boundary layer of swimming fish." Journal of Experimental Biology 204, no. 1 (2001): 81–102. http://dx.doi.org/10.1242/jeb.204.1.81.

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Tangential and normal velocity profiles of the boundary layer surrounding live swimming fish were determined by digital particle tracking velocimetry, DPTV. Two species were examined: the scup Stenotomus chrysops, a carangiform swimmer, and the smooth dogfish Mustelus canis, an anguilliform swimmer. Measurements were taken at several locations over the surfaces of the fish and throughout complete undulatory cycles of their propulsive motions. The Reynolds number based on length, Re, ranged from 3×10(3) to 3×10(5). In general, boundary layer profiles were found to match known laminar and turbul

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19

Pedlosky, Joseph. "The Coastal Bottom Boundary Layer: A Note on the Model of Chapman and Lentz." Journal of Physical Oceanography 37, no. 11 (2007): 2776–84. http://dx.doi.org/10.1175/2007jpo3710.1.

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Abstract The bottom boundary layer of a stratified flow on a coastal continental shelf is examined using the model of Chapman and Lentz. The flow is driven by a surface stress, uniform in the alongshore coordinate, in a downwelling-favorable direction. The stress diminishes in the offshore direction and produces an Ekman pumping, as well as an onshore Ekman flux. The model yields an interior flow, sandwiched between an upper Ekman layer and a bottom boundary layer. The interior has a horizontal density gradient produced by a balance between horizontal diffusion of density and vertical advectio

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20

Ohue, Hiroshi, Genshi Kawashima, and Wen-Jei Yang. "Ekman Boundary Layers and Energy Dissipation in Rotating Drums During Spin-Down Process." International Journal of Rotating Machinery 2, no. 2 (1995): 113–21. http://dx.doi.org/10.1155/s1023621x95000261.

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The Laser Doppler Velocimetry (LDV) is employed to investigate energy dissipation during a spin-down process inside a rotating drum. The tracer/light sheet method is applied to observe flow patterns in the entire flow field from which the instantaneous, two-dimensional velocity distribution and the formation and subsequent time wise variation of the Ekman boundary layer are determined. Results are synthesized to find the relationship between the Ekman boundary layer and the redistribution of secondary-flow induced angular momentum. The fluid viscosity, drum size and speed of rotation are varie

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21

Owens, Lewis R., Brian G. Allan, and Susan A. Gorton. "Boundary-Layer-Ingesting Inlet Flow Control." Journal of Aircraft 45, no. 4 (2008): 1431–40. http://dx.doi.org/10.2514/1.36989.

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22

Lauchle, Gerald C. "Hydroacoustics of Transitional Boundary-Layer Flow." Applied Mechanics Reviews 44, no. 12 (1991): 517–31. http://dx.doi.org/10.1115/1.3119491.

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Transitional boundary layers exist on surfaces and bodies operating in viscous fluids at speeds such that the critical Reynolds number based on the distance from the leading edge is exceeded. The transition region is composed of a simultaneous mixture of both laminar and turbulent regimes occurring randomly in space and time. The turbulent regimes are known as turbulent spots, they grow rapidly with downstream distance, and they ultimately coalesce to form the beginning of fully-developed turbulent boundary-layer flow. It has been long suspected that such a region of unsteadiness may give rise

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23

Chamkha, A. J., I. Pop, and H. S. Takhar. "Marangoni Mixed Convection Boundary Layer Flow." Meccanica 41, no. 2 (2006): 219–32. http://dx.doi.org/10.1007/s11012-005-3352-y.

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24

Harloff, Gary J., and Gregory E. Smith. "Supersonic-inlet boundary-layer bleed flow." AIAA Journal 34, no. 4 (1996): 778–85. http://dx.doi.org/10.2514/3.13140.

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25

Taylor, P. A., P. J. Mason, and E. F. Bradley. "Boundary-layer flow over low hills." Boundary-Layer Meteorology 39, no. 1-2 (1987): 107–32. http://dx.doi.org/10.1007/bf00121870.

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26

Finnigan, John, Keith Ayotte, Ian Harman, et al. "Boundary-Layer Flow Over Complex Topography." Boundary-Layer Meteorology 177, no. 2-3 (2020): 247–313. http://dx.doi.org/10.1007/s10546-020-00564-3.

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27

Park, Yong Sung, Philip L. F. Liu, and I.-Chi Chan. "Contact line dynamics and boundary layer flow during reflection of a solitary wave." Journal of Fluid Mechanics 707 (July 13, 2012): 307–30. http://dx.doi.org/10.1017/jfm.2012.280.

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AbstractIn this paper we present a set of wave flume experiments for a solitary wave reflecting off a vertical wall. A particle tracking velocimetry (PTV) technique is used to measure free-surface velocity and the velocity field in the vicinity of the moving contact line. We observe that the free surface undergoes the so-called rolling motion as the contact line moves up and down the vertical wall, and fluid particles on the free surface almost always flow toward the wall except at the end of the reflection process. As the contact line descends along the wall, wall boundary layer flows move in

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28

Wu, Lei. "Boundary Layer of Transport Equation with In-Flow Boundary." Archive for Rational Mechanics and Analysis 235, no. 3 (2019): 2085–169. http://dx.doi.org/10.1007/s00205-019-01461-x.

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29

RUBAN, A. I., and I. TURKYILMAZ. "On laminar separation at a corner point in transonic flow." Journal of Fluid Mechanics 423 (November 3, 2000): 345–80. http://dx.doi.org/10.1017/s002211200000207x.

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The separation of the laminar boundary layer from a convex corner on a rigid body contour in transonic flow is studied based on the asymptotic analysis of the Navier–Stokes equations at large values of the Reynolds number. It is shown that the flow in a small vicinity of the separation point is governed, as usual, by strong interaction between the boundary layer and the inviscid part of the flow. Outside the interaction region the Kármán–Guderley equation describing transonic inviscid flow admits a self-similar solution with the pressure on the body surface being proportional to the cubic root

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30

Guo, Boyun, George Stewart, and Mario Toro. "Linearly Supported Radial Flow-A Flow Regime in Layered Reservoirs." SPE Reservoir Evaluation & Engineering 5, no. 02 (2002): 103–10. http://dx.doi.org/10.2118/77269-pa.

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Summary This paper discusses pressure responses from a formation with two communicating layers in which a fully penetrated high permeability layer is adjacent to a low-permeability layer. An analytical reservoir model is presented for well-test analysis of the layered systems, with the bottom of the low-permeability layer being a constant-pressure boundary. The strength of the support from the low-permeability layer is characterized with two parameters: layer bond constant and storage capacity. Introduction The log-log plot of pressure derivative vs. time is called a diagnostic plot in well-te

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31

Schobeiri, M. T., and L. Wright. "Advances in Unsteady Boundary Layer Transition Research, Part I: Theory and Modeling." International Journal of Rotating Machinery 9, no. 1 (2003): 1–9. http://dx.doi.org/10.1155/s1023621x03000010.

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This two-part article presents recent advances in boundary layer research that deal with the unsteady boundary layer transition modeling and its validation. A new unsteady boundary layer transition model was developed based on a universal unsteady intermittency function. It accounts for the effects of periodic unsteady wake flow on the boundary layer transition. To establish the transition model, an inductive approach was implemented; the approach was based on the results of comprehensive experimental and theoretical studies of unsteady wake flow and unsteady boundary layer flow. The experimen

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32

NASH, EMMA C., MARTIN V. LOWSON, and ALAN McALPINE. "Boundary-layer instability noise on aerofoils." Journal of Fluid Mechanics 382 (March 10, 1999): 27–61. http://dx.doi.org/10.1017/s002211209800367x.

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An experimental and theoretical investigation has been carried out to understand the tonal noise generation mechanism on aerofoils at moderate Reynolds number. Experiments were conducted on a NACA0012 aerofoil section in a low-turbulence closed working section wind tunnel. Narrow band acoustic tones were observed up to 40 dB above background noise. The ladder structure of these tones was eliminated by modifying the tunnel to approximate to anechoic conditions. High-resolution flow velocity measurements have been made with a three-component laser-Doppler anemometer (LDA) which have revealed the

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33

Aoki, M., and K. Yamamoto. "Inlet Reverse Flow Mechanism in Axial Flow Turbomachines With Neither Stall Nor Significant Radial Flow." Journal of Turbomachinery 114, no. 2 (1992): 392–97. http://dx.doi.org/10.1115/1.2929156.

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The cause of inlet reverse flow was studied in axial flow turbo machinery. A helical inducer, in which neither stall nor significant radial flow was observed, was selected as the experimental model. The flow between the blades was measured by a laser-Doppler velocimeter and investigated using the end-wall boundary-layer theory. Results showed that the inlet reverse flow occurs adjacent to the pressure surface between the blades in the vicinity of the casing wall. Inlet reverse flow, caused by a momentum defect in the axial direction in the boundary layer on the casing wall and a significant pr

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34

Sleath, J. F. A. "Coastal Bottom Boundary Layers." Applied Mechanics Reviews 48, no. 9 (1995): 589–600. http://dx.doi.org/10.1115/1.3023147.

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Turbulent boundary layers in oscillatory flow are reviewed. These boundary layers show a thin inner layer with similar characteristics to wall layers in steady flow. Above this, there is an outer layer which has some characteristics which are the same as those of steady flow outer layers and other characteristics which are different. One difference is that the defect velocity profile does not scale on the shear velocity alone. Also, over rough beds, the turbulence intensity in the outer layer falls off with height in a similar way to oscillating grid turbulence. Transition from laminar to turb

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35

Shi, Mingfang, Lidan Xu, Zhenqing Wang, and Hongqing Lv. "Effect of a Roughness Element on the Hypersonic Boundary Layer Receptivity Due to Different Types of Free-Stream Disturbance with a Single Frequency." Entropy 21, no. 3 (2019): 255. http://dx.doi.org/10.3390/e21030255.

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The hypersonic flow field around a blunt cone was simulated using a high-order finite difference method. Fast acoustic waves, slow acoustic waves, entropy waves, and vortical waves were introduced into the free-stream to determine the influence of a free-stream with disturbances on the hypersonic flow field and boundary layer. The effect of disturbance type on the evolution of perturbations in the hypersonic boundary layer was analyzed. Fast Fourier Transform was adopted to analyze the effect of the disturbance type on the evolution of different modes in the boundary layer. A roughness element

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36

Xu, Guangye, and Kazuhiko Iwai. "Micro-Scale Flow Excitation under Imposition of Uniform Magnetic Field and Electrical Current." Metals 12, no. 12 (2022): 2034. http://dx.doi.org/10.3390/met12122034.

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Mass transfer is often the rate-determining step for solid-liquid chemical reactions. Decreasing the concentration boundary layer thickness is essential to intensify the chemical reaction. Because the concentration boundary layer exists in the velocity boundary layer, forcing imposition on the concentration boundary layer by superimposing an electrical current and a magnetic field was proposed. Through this, flow can be directly excited in the concentration boundary layer. The previous results indicate that by superimposing a direct current and a gradient magnetic field, the development of the

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37

Prakash, R., L. M. Le Page, L. P. McQuellin, S. L. Gai, and S. O’Byrne. "Direct simulation Monte Carlo computations and experiments on leading-edge separation in rarefied hypersonic flow." Journal of Fluid Mechanics 879 (October 2, 2019): 633–81. http://dx.doi.org/10.1017/jfm.2019.692.

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A comprehensive study of the fundamental characteristics of leading-edge separation in rarefied hypersonic flows is undertaken and its salient features are elucidated. Separation of a boundary layer undergoing strong expansion is typical in many practical hypersonic applications such as base flows of re-entry vehicles and flows over deflected control surfaces. Boundary layer growth under such conditions is influenced by effects of rarefaction and thermal non-equilibrium, thereby differing significantly from the conventional no-slip Blasius type. A leading-edge separation configuration presents

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38

Al Saeedi, Bashar, and Zahir Hussain. "Inviscid Modes within the Boundary-Layer Flow of a Rotating Disk with Wall Suction and in an External Free-Stream." Mathematics 9, no. 22 (2021): 2967. http://dx.doi.org/10.3390/math9222967.

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The purpose of this paper is to investigate the linear stability analysis for the laminar-turbulent transition region of the high-Reynolds-number instabilities for the boundary layer flow on a rotating disk. This investigation considers axial flow along the surface-normal direction, by studying analytical expressions for the steady solution, laminar, incompressible and inviscid fluid of the boundary layer flow due to a rotating disk in the presence of a uniform injection and suction. Essentially, the physical problem represents flow entrainment into the boundary layer from the axial flow, whic

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39

Madi, Arous, Amina Mataoui, and Zahia Bouahmed. "Influence of upstream flow characteristics on the reattachment phenomenon in shallow cavities." Thermal Science 15, no. 3 (2011): 721–34. http://dx.doi.org/10.2298/tsci101203019m.

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The influence of the upstream flow characteristics on the behavior of the flow over a shallow cavity and on the reattachment phenomenon is examined in this paper. Accordingly, a comparison of the cavity?s flow structure is performed for two different upstream flows: the wall jet flow and the boundary layer flow. The wall jet possesses a particular structure with two regions: an inner layer analogous to that of a boundary layer and an outer layer similar to that of a free jet; this layer is an additional source of turbulence production in addition to that of the inner shear layer. The present s

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40

Imberger, J., and G. N. Ivey. "Boundary mixing in stratified reservoirs." Journal of Fluid Mechanics 248 (March 1993): 477–91. http://dx.doi.org/10.1017/s0022112093000850.

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We consider the steady flow driven by turbulent mixing in a benthic boundary layer along a sloping boundary in the general case of a non-uniform background density gradient. The velocity and density fields are decomposed into barotropic and baroclinic components, and a solution is obtained by taking an expansion in the small parameter A, the aspect ratio of the boundary layer defined as the thickness divided by the alongslope length. The flow in the boundary layer is governed by a balance between alongslope baroclinic and barotropic density fluxes. A number of flow regimes can exist, and we sh

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41

Dmytriv, T. V., O. S. Lanets, V. T. Dmytriv, I. V. Dmytriv, I. M. Horodetskyy, and N. G. Horodetska. "The method of experimental determination of tangential stresses on the surface of flow around with a gaseous medium." IOP Conference Series: Materials Science and Engineering 1277, no. 1 (2023): 012026. http://dx.doi.org/10.1088/1757-899x/1277/1/012026.

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Abstract Experimental research of the force load on the flow around surface is important for the design of aircraft and gas transport systems. The main parameter is the tangential stress, which is maximum in the boundary layer on the flow around surface. The velocity in the boundary layer and its thickness affect the tangential stresses that arise during the flow of the medium. They also have an influence on the friction coefficient, which characterizes the pressure losses. In the work, the method of experimental measurement of velocity on the flow around surface is considered, and an informat

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42

Belan, S., A. Chernykh, and V. Lebedev. "Boundary layer of elastic turbulence." Journal of Fluid Mechanics 855 (September 21, 2018): 910–21. http://dx.doi.org/10.1017/jfm.2018.662.

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We investigate theoretically the near-wall region in elastic turbulence of a dilute polymer solution in the limit of large Weissenberg number. As has been established experimentally, elastic turbulence possesses a boundary layer where the fluid velocity field can be approximated by a steady shear flow with relatively small fluctuations on the top of it. Assuming that at the bottom of the boundary layer the dissolved polymers can be considered as passive objects, we examine analytically and numerically the statistics of the polymer conformation, which is highly non-uniform in the wall-normal di

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43

Tempelmann, David, Ardeshir Hanifi, and Dan S. Henningson. "Swept-wing boundary-layer receptivity." Journal of Fluid Mechanics 700 (April 18, 2012): 490–501. http://dx.doi.org/10.1017/jfm.2012.152.

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AbstractAdjoint solutions of the linearized incompressible Navier–Stokes equations are presented for a cross-flow-dominated swept-wing boundary layer. For the first time these have been computed in the region upstream of the swept leading edge and may therefore be used to predict receptivity to any disturbances of the incoming free stream as well as to surface roughness. In this paper we present worst-case scenarios, i.e. those external disturbances yielding maximum receptivity amplitudes of a steady cross-flow disturbance. In the free stream, such an ‘optimal’ disturbance takes the form of a

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Siddiqui, Muhammad Ehtisham. "EXPERIMENTAL INVESTIGATION OF FLOW RESPONSE TO STATIONARY DISTURBANCE IN ROTATING-DISK FLOW." NED University Journal of Research XVI, no. 2 (2019): 13–22. http://dx.doi.org/10.35453/nedjr-ascn-2018-0047.

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Three-dimensional boundary-layer flow is well known for its abrupt and sharp transition from laminar to turbulent regime. The presented study is a first attempt to achieve the target of delaying the natural transition to turbulence. The behaviour of two different shaped and sized stationary disturbances (in the laboratory frame) on the rotating-disk boundary layer flow is investigated. These disturbances are placed at dimensionless radial location (Rf = 340) which lies within the convectively unstable zone over a rotating-disk. Mean velocity profiles were measured using constant-temperature ho

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Sinhamahapatra, K. P., and B. C. Basu. "Viscous corrections on wings in incompressible flow." Aeronautical Journal 94, no. 932 (1990): 67–72. http://dx.doi.org/10.1017/s0001924000022454.

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Numerical methods have been developed to analyse incompressible viscous flows past three dimensional wings with deflected flap using viscous-inviscid interaction techniques. By using a surface transpiration technique, a panel method for external potential flow calculation is combined with a boundary-layer calculation based on an integral method. For the clean wing case, both three dimensional boundary layer corrections and two dimensional boundary layer corrections are applied in a strip theory sense and compared with experimental results in the literature. It is found that for wings with mode

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Liang, Chang-Hai, Ming-Bo Sun, Yu-hui Huang, et al. "Mechanism of development of turbulent boundary layer in a curved circular pipe under supersonic conditions." AIP Advances 12, no. 3 (2022): 035039. http://dx.doi.org/10.1063/5.0085586.

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This study investigates the characteristics of a turbulent boundary layer in a curved circular pipe under an inflow of Ma = 3.0. The pipe consisted of a straight part and a curved part with a turning angle of 36° and a radius of curvature, γ = R/R c, of γ = 0.0825. The nanoparticle-based planar laser scattering technique was applied to visualize the structure of the instantaneous flow field, and a large eddy simulation was conducted to uncover the physical aspects of development of the turbulent boundary layer. The distributions of density and vorticity, baroclinic pressure caused by the densi

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Bhawanin, Mahesa, Tom O'Donoghue, Dominic A. Van der A, and Jan S. Ribberink. "EFFECT OF FLOW IRREGULARITY ON OSCILLATORY BOUNDARY LAYER FLOW." Coastal Engineering Proceedings 1, no. 34 (2014): 44. http://dx.doi.org/10.9753/icce.v34.sediment.44.

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Conley, Daniel C., and Douglas L. Inman. "Ventilated oscillatory boundary layers." Journal of Fluid Mechanics 273 (August 25, 1994): 261–84. http://dx.doi.org/10.1017/s002211209400193x.

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Boundary layers arising from flows which oscillate parallel to a permeable bed, and are subject to oscillating percolation of the same frequency as the bed parallel flow, referred to here as ‘ventilated oscillatory boundary layers’, are the subject of this laboratory study. These boundary layers are intended to approximate naturally occurring wave boundary layers over permeable beds. Measurements of boundary-layer velocities, bed stress and turbulent flow properties are presented. It is observed that suction (flow into the bed) enhances the near-bed velocities and bed stress while injection (f

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Dou, Hua-Shu, Wenqian Xu, and Boo Cheong Khoo. "Stability of boundary layer flow based on energy gradient theory." Modern Physics Letters B 32, no. 12n13 (2018): 1840003. http://dx.doi.org/10.1142/s0217984918400031.

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The flow of the laminar boundary layer on a flat plate is studied with the simulation of Navier–Stokes equations. The mechanisms of flow instability at external edge of the boundary layer and near the wall are analyzed using the energy gradient theory. The simulation results show that there is an overshoot on the velocity profile at the external edge of the boundary layer. At this overshoot, the energy gradient function is very large which results in instability according to the energy gradient theory. It is found that the transverse gradient of the total mechanical energy is responsible for t

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Ong, C. L., and J. M. Owen. "Boundary-Layer Flows in Rotating Cavities." Journal of Turbomachinery 111, no. 3 (1989): 341–48. http://dx.doi.org/10.1115/1.3262278.

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A rotating cylindrical cavity with a radial outflow of fluid provides a simple model of the flow between two corotating air-cooled gas-turbine disks. The flow structure comprises a source region near the axis of rotation, boundary layers on each disk, a sink layer on the peripheral shroud, and an interior core of rotating inviscid fluid between the boundary layers. In the source region, the boundary layers entrain fluid; outside this region, nonentraining Ekman-type layers are formed on the disks. In this paper, the differential boundary-layer equations are solved to predict the velocity distr

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