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Artykuły w czasopismach na temat „Rough boundary”

Autor: Grafiati

Data publikacji: 6 września 2023

Data aktualizacji: 31 lipca 2025

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1

R. Nithya, Et al. "Rough Set Techniques in Wireless Sensor Networks using Membership Function and Rough Labelling Graphs for Energy Aware Routing." International Journal on Recent and Innovation Trends in Computing and Communication 11, no. 9 (2023): 2545–56. http://dx.doi.org/10.17762/ijritcc.v11i9.9323.

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Rough set theory and rough graphs are employed for data analysis. Rough graphs utilize approximations, and this paper presents a method for implementing rough graphs using rough membership functions and graph labeling for data structures and reduction. This paper proposes a rough graph labeling method, termed rough -labeling similarity graph, that utilizes a similarity measure for vertex and edge labeling. This method aims to minimize boundary regions in rough graphs and is applicable to wireless sensor networks (WSNs). In WSN, the proposed algorithms such as PSO-LSTM, COA-LSTM, LOA-LSTM integ

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2

Yu, Wei Wei, Xiao Qin Guan, Yi Hui Li, and Hang Lin. "Boundary Effect to the Safety Factor of Slope in Geo-Material." Advanced Materials Research 382 (November 2011): 84–87. http://dx.doi.org/10.4028/www.scientific.net/amr.382.84.

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Boundary conditions have great impact on the stability of three dimensional geo-material, like slope, which is one of the oldest applications in geotechnical engineering. In order to analyze the impact of boundary condition to factor of safety of slope, the 3D stability analysis was then extended to the “rough-smooth” and “smooth-smooth” boundary. By studying slopes with the same geometric condition and shear strength parameters, the results show that the safety factors obtained from “rough-smooth” boundary are smaller than those got from “rough-smooth” boundary and bigger than those got from

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3

Denk, Robert, David Ploß, Sophia Rau, and Jörg Seiler. "Boundary value problems with rough boundary data." Journal of Differential Equations 366 (September 2023): 85–131. http://dx.doi.org/10.1016/j.jde.2023.04.001.

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4

Raupach, M. R., R. A. Antonia, and S. Rajagopalan. "Rough-Wall Turbulent Boundary Layers." Applied Mechanics Reviews 44, no. 1 (1991): 1–25. http://dx.doi.org/10.1115/1.3119492.

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This review considers theoretical and experimental knowledge of rough-wall turbulent boundary layers, drawing from both laboratory and atmospheric data. The former apply mainly to the region above the roughness sublayer (in which the roughness has a direct dynamical influence) whereas the latter resolve the structure of the roughness sublayer in some detail. Topics considered include the drag properties of rough surfaces as functions of the roughness geometry, the mean and turbulent velocity fields above the roughness sublayer, the properties of the flow close to and within the roughness canop

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5

Engel, Konrad, and Tran Dan Thu. "Boundary optimization for rough sets." Discrete Mathematics 341, no. 9 (2018): 2465–77. http://dx.doi.org/10.1016/j.disc.2018.05.023.

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6

Katayama, Kiyofumi, Kazuo Tanaka, and Masahiro Tanaka. "Numerical analysis of frequency characteristics of transmitted waves by random waveguide." AIP Advances 12, no. 10 (2022): 105305. http://dx.doi.org/10.1063/5.0099016.

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The frequency characteristics of the transmitted waves by the two-dimensional single-mode waveguide with a slightly rough boundary are investigated in detail. Two realizations of the waveguide with random rough boundaries are considered. Since the boundary element method based on the guided-mode extracted integral equation is employed, the boundary condition on the random rough boundary is accurately satisfied. It is found that the strong resonances with high Q-factor are created close to the cutoff frequency of the second-mode in the waveguide and they cause the small transmission (high refle

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7

Ligrani, Phillip M., and Robert J. Moffat. "Structure of transitionally rough and fully rough turbulent boundary layers." Journal of Fluid Mechanics 162, no. -1 (1986): 69. http://dx.doi.org/10.1017/s0022112086001933.

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8

Zhao, Zhiyi, Dalei Zhu, Yaodong Yang, et al. "Effect of Multi-rough Element Combination on Hypersonic Boundary Layer." Advances in Engineering Technology Research 9, no. 1 (2024): 465. http://dx.doi.org/10.56028/aetr.9.1.465.2024.

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In this paper, the influence of multi-rough element combination controlled by cubic polynomial on the flow field of hypersonic blunt wedge is studied by direct numerical simulation. The influence mechanism of six continuous rough element combinations on the flow parameters in the boundary layer is analyzed in depth, and compared with the influence of double rough elements. It is concluded that the first rough element of the continuous rough element combination has a great influence on the flow field pressure, and the influence of the latter rough element decreases in turn. The combination of s

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9

MCDANIEL, SUZANNE T. "RENORMALIZING ROUGH-SURFACE SCATTER." Journal of Computational Acoustics 10, no. 01 (2002): 53–68. http://dx.doi.org/10.1142/s0218396x02001541.

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Exact and approximate solutions to the rough-surface scattering problem are compared to examine the predictive capability of renormalized surface scattering theory. Numerical results are presented for scattering from one-dimensional rough periodic surfaces on which the Dirichlet (acoustic pressure-release) and Neumann (acoustically rigid) boundary conditions are imposed. For scattering from Dirichlet surfaces, the predictions of renormalized scattering theory are found to provide better agreement with exact solutions than perturbation theory. For this boundary condition, many convergent approx

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10

Yang, Zhibin, Xiaoming Zhai, David P. Marshall, and Guihua Wang. "An Idealized Model Study of Eddy Energetics in the Western Boundary “Graveyard”." Journal of Physical Oceanography 51, no. 4 (2021): 1265–82. http://dx.doi.org/10.1175/jpo-d-19-0301.1.

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AbstractRecent studies show that the western boundary acts as a “graveyard” for westward-propagating ocean eddies. However, how the eddy energy incident on the western boundary is dissipated remains unclear. Here we investigate the energetics of eddy–western boundary interaction using an idealized MIT ocean circulation model with a spatially variable grid resolution. Four types of model experiments are conducted: 1) single eddy cases, 2) a sea of random eddies, 3) with a smooth topography, and 4) with a rough topography. We find significant dissipation of incident eddy energy at the western bo

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11

Glovnea, R. P., A. V. Olver, and H. A. Spikes. "Lubrication of Rough Surfaces by a Boundary Film-Forming Viscosity Modifier Additive." Journal of Tribology 127, no. 1 (2005): 223–29. http://dx.doi.org/10.1115/1.1828069.

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In previous work it was shown that some functionalized polymers used as viscosity index improvers are able to form thick boundary lubricating films. This behavior results from adsorption of the polymer on metal surfaces to form a layer of enhanced viscosity adjacent to the surface. In the current work the behavior of one such polymer in rough surface contact conditions is studied, using both model and real rough surfaces. It is found that the polymer is able to form a thick boundary film in rough surface contact, just as it does with smooth surfaces. It is also shown that the effect of this bo

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12

Ashrafian, Alireza, and Stein Tore Johansen. "Wall boundary conditions for rough walls." Progress in Computational Fluid Dynamics, An International Journal 7, no. 2/3/4 (2007): 230. http://dx.doi.org/10.1504/pcfd.2007.013015.

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13

Chen, Xinfu, Xiao-Ping Wang, and Xianmin Xu. "Effective contact angle for rough boundary." Physica D: Nonlinear Phenomena 242, no. 1 (2013): 54–64. http://dx.doi.org/10.1016/j.physd.2012.08.018.

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14

Acharya, M., J. Bornstein, and M. P. Escudier. "Turbulent boundary layers on rough surfaces." Experiments in Fluids 4, no. 1 (1986): 33–47. http://dx.doi.org/10.1007/bf00316784.

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15

DeSanto, John A. "Impedance at a rough waveguide boundary." Wave Motion 7, no. 4 (1985): 307–18. http://dx.doi.org/10.1016/0165-2125(85)90002-2.

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16

VOLINO, R. J., M. P. SCHULTZ, and K. A. FLACK. "Turbulence structure in rough- and smooth-wall boundary layers." Journal of Fluid Mechanics 592 (November 14, 2007): 263–93. http://dx.doi.org/10.1017/s0022112007008518.

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Turbulence measurements for rough-wall boundary layers are presented and compared to those for a smooth wall. The rough-wall experiments were made on a woven mesh surface at Reynolds numbers approximately equal to those for the smooth wall. Fully rough conditions were achieved. The present work focuses on turbulence structure, as documented through spectra of the fluctuating velocity components, swirl strength, and two-point auto- and cross-correlations of the fluctuating velocity and swirl. The present results are in good agreement, both qualitatively and quantitatively, with the turbulence s

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17

Ullah, Shah Neyamat, Yu Xia Hu, David White, and Samuel Stanier. "Lateral Boundary Effect in Centrifuge Tests for Spudcan Penetration in Uniform Clay." Applied Mechanics and Materials 553 (May 2014): 458–63. http://dx.doi.org/10.4028/www.scientific.net/amm.553.458.

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The effect of the centrifuge strongbox boundary on the penetration resistance of a spudcan foundation in uniform clay has been studied using Large Deformation FE analysis. Both smooth and rough strongbox boundaries were considered with various strongbox sizes. The spudcan penetration resistance and soil flow mechanisms were analysed. It was observed that, when the strongbox size was reduced, the spudcan penetration resistance was decreased for a smooth boundary and increased for a rough boundary. The depth of cavity formed above the spudcan during its penetration, in most cases, was determined

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18

Garcia, Matt, Eugene N. A. Hoffman, Elijah J. LaLonde, et al. "Effects of Surface Roughness on Shock-Wave/Turbulent Boundary-Layer Interaction at Mach 4 over a Hollow Cylinder Flare Model." Fluids 7, no. 9 (2022): 286. http://dx.doi.org/10.3390/fluids7090286.

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Although it is understood that surface roughness can impact boundary layer physics in high-speed flows, there has been little research aimed at understanding the potential impact of surface roughness on high-speed shock-wave/boundary-layer interactions. Here, a hollow cylinder flare model was used to study the potential impact of distributed surface roughness on shock-wave/boundary-layer interaction unsteadiness. Two surface conditions were tested—a smooth steel finish with an average roughness of 0.85 μm and a rough surface (3K carbon fiber) with an average roughness value of 9.22 μm. The sep

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19

McIlroy, Hugh M., and Ralph S. Budwig. "The Boundary Layer Over Turbine Blade Models With Realistic Rough Surfaces." Journal of Turbomachinery 129, no. 2 (2005): 318–30. http://dx.doi.org/10.1115/1.2218572.

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Results are presented of extensive boundary layer measurements taken over a flat, smooth plate model of the front one-third of a turbine blade and over the model with an embedded strip of realistic rough surface. The turbine blade model also included elevated freestream turbulence and an accelerating freestream in order to simulate conditions on the suction side of a high-pressure turbine blade. The realistic rough surface was developed by scaling actual turbine blade surface data provided by U.S. Air Force Research Laboratory. The rough patch can be considered to be an idealized area of distr

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20

Hosni, M. H., H. W. Coleman, and R. P. Taylor. "Measurement and Calculation of Fluid Dynamic Characteristics of Rough-Wall Turbulent Boundary-Layer Flows." Journal of Fluids Engineering 115, no. 3 (1993): 383–88. http://dx.doi.org/10.1115/1.2910150.

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Experimental measurements of profiles of mean velocity and distributions of boundary-layer thickness and skin friction coefficient from aerodynamically smooth, transitionally rough, and fully rough turbulent boundary-layer flows are presented for four surfaces—three rough and one smooth. The rough surfaces are composed of 1.27 mm diameter hemispheres spaced in staggered arrays 2, 4, and 10 base diameters apart, respectively, on otherwise smooth walls. The current incompressible turbulent boundary-layer rough-wall air flow data are compared with previously published results on another, similar

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21

Myrhaug, D. "Note on Water Drag on Sea Ice for Different Surface Roughness." Journal of Offshore Mechanics and Arctic Engineering 113, no. 1 (1991): 67–69. http://dx.doi.org/10.1115/1.2919898.

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The approach in Myrhaug [1], where a simple analytical theory describing the motion in a turbulent planetary boundary layer near a rough seabed was presented, is extended to smooth and transitional smooth-to-rough turbulent flow. An inverted boundary layer similar to that at the seabed is applicable under the sea ice. The water drag coefficient at the ice surface and the direction of the surface shear stress are presented for rough, smooth and transitional turbulent flows.

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22

Schaal, M., P. Lamparter, and S. Steeb. "Fractal Behaviour of Amorphous Ni32Pd52P16 Studied by SANS." Zeitschrift für Naturforschung A 44, no. 1 (1989): 4–6. http://dx.doi.org/10.1515/zna-1989-0102.

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Abstract Small angle neutron scattering (SANS) was done with meltspun amorphous Ni32Pd52P16 in the as-quenched state as well as after annealing at 533 K, 570 K. and 607 K, 20 h each. The double logarithmic plot of the structure factor versus the momentum transfer shows linear behaviour with noninteger Porod-slopes. The results are interpreted with the scattering from fractally rough inner surfaces.The as-quenched state contains fluctuations of the scattering length density associated with smooth boundary interfaces. Annealing yields rough boundary interfaces, the roughness being largest after

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23

Goluskin, David, and Charles R. Doering. "Bounds for convection between rough boundaries." Journal of Fluid Mechanics 804 (September 9, 2016): 370–86. http://dx.doi.org/10.1017/jfm.2016.528.

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We consider Rayleigh–Bénard convection in a layer of fluid between rough no-slip boundaries where the top and bottom boundary heights are functions of the horizontal coordinates with square-integrable gradients. We use the background method to derive an upper bound on the mean heat flux across the layer for all admissible boundary geometries. This flux, normalized by the temperature difference between the boundaries, can grow with the Rayleigh number ($Ra$) no faster than $O(Ra^{1/2})$ as $Ra\rightarrow \infty$. Our analysis yields a family of similar bounds, depending on how various estimates

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24

Li, Hong, Guo Yin Wang, Guang Lei Gou, and Wen Liu. "Boundary Variable Precision Dominance-Based Rough Set Approach in Multicriteria Sorting Problems." Advanced Materials Research 734-737 (August 2013): 3102–6. http://dx.doi.org/10.4028/www.scientific.net/amr.734-737.3102.

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This paper provides a novel method of boundary variable precision dominance-based rough set approach (BVP-DRSA) to solve multicriteria sorting problem that differs from usual classification problems since it takes into account preference orders in the description of objects by condition and decision attributes. The major contribution of our BVP-DRSA method is that it combines variable precision and dominance-based rough set approach (DRSA). This approach is different from the dominance-based rough set approach (DRSA) because it takes boundary into account and can deal with boundary directly. C

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25

Meyers, Timothy, Jonathan B. Forest, and William J. Devenport. "The wall-pressure spectrum of high-Reynolds-number turbulent boundary-layer flows over rough surfaces." Journal of Fluid Mechanics 768 (March 9, 2015): 261–93. http://dx.doi.org/10.1017/jfm.2014.743.

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Experiments have been performed on a series of high-Reynolds-number flat-plate turbulent boundary layers formed over rough and smooth walls. The boundary layers were fully rough, yet the elements remained a very small fraction $({<}1.4\,\%)$ of the boundary-layer thickness, ensuring conditions free of transitional effects. The wall-pressure spectrum and its scaling were studied in detail. One of the major findings is that the rough-wall turbulent pressure spectrum at vehicle relevant conditions is comprised of three scaling regions. These include a newly discovered high-frequency region whe

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26

Wahed Khalifa, Hamiden Abd El, Dragan Pamucar, Amina Hadj Kacem, and W. A. Afifi. "A Novel Approach for Characterizing Solutions of Rough Optimization Problems Based on Boundary Region." Computational Intelligence and Neuroscience 2022 (March 24, 2022): 1–12. http://dx.doi.org/10.1155/2022/8662289.

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Rough set theory, presented by Pawlak in 1981, is one of the most well-known methods for communicating ambiguity by estimating an item based on some knowledge rather than membership. The concept of a rough function and its convexity and differentiability in regard to its boundary region are discussed in this work. The boundary notion is also used to present a new form of rough programming issue and its solutions. Finally, numerical examples are provided to demonstrate the proposed method and emphasize its advantages over other approaches.

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27

INUIGUCHI, MASAHIRO. "ATTRIBUTE REDUCTION IN VARIABLE PRECISION ROUGH SET MODEL." International Journal of Uncertainty, Fuzziness and Knowledge-Based Systems 14, no. 04 (2006): 461–79. http://dx.doi.org/10.1142/s0218488506004126.

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In this paper, attribute reduction in variable precision rough set model is discussed. Several kinds of reducts preserving some of lower approximations, upper approximations, boundary regions and the unpredictable region are discussed. Relations among those kinds of reducts are investigated. As a basis for reduct computation, Boolean function representations of the preservation of lower approximations, upper approximations, boundary regions and the unpredictable region are discussed. Throughout this paper, the great difference between the analysis using variable precision rough sets and the cl

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28

Šimurda, David, Jindřich Hála, Martin Luxa, and Tomáš Radnic. "Optical and Hot-Film Measurements of the Boundary Layer Transition on a Naca Airfoil." E3S Web of Conferences 345 (2022): 01011. http://dx.doi.org/10.1051/e3sconf/202234501011.

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This study explores the possibilities of identifying position of a boundary layer transition using hot film measurements complemented by classical optical methods i.e. interferometry and schlieren method. The subject of the measurement is a NACA 0010-64 airfoil with varying leading edge surface quality corresponding to smooth surface and rough surface with Ra ~ 50 and Ra ~ 100. Measurements are performed at several subsonic regimes and a transonic regime. Despite several shortcomings of the experimental setup, the method proved to be useful in providing information on the boundary layer transi

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29

Hosni, M. H., H. W. Coleman, and R. P. Taylor. "Heat Transfer Measurements and Calculations in Transitionally Rough Flow." Journal of Turbomachinery 113, no. 3 (1991): 404–11. http://dx.doi.org/10.1115/1.2927889.

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Experimental data on a rough surface for both transitionally rough and fully rough turbulent flow regimes are presented for Stanton number distribution, skin friction coefficient distribution, and turbulence intensity profiles. The rough surface is composed of 1.27-mm-dia hemispheres spaced in a staggered array four base diameters apart on an otherwise smooth wall. Special emphasis is placed on the characteristics of heat transfer in the transitionally rough flows. Stanton number data are reported for zero pressure gradient incompressible turbulent boundary layer air flow for nominal free-stre

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30

SCHULTZ, M. P., and K. A. FLACK. "The rough-wall turbulent boundary layer from the hydraulically smooth to the fully rough regime." Journal of Fluid Mechanics 580 (May 21, 2007): 381–405. http://dx.doi.org/10.1017/s0022112007005502.

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Turbulence measurements for rough-wall boundary layers are presented and compared to those for a smooth wall. The rough-wall experiments were made on a three-dimensional rough surface geometrically similar to the honed pipe roughness used by Shockling, Allen & Smits (J. Fluid Mech. vol. 564, 2006, p. 267). The present work covers a wide Reynolds-number range (Reθ = 2180–27 100), spanning the hydraulically smooth to the fully rough flow regimes for a single surface, while maintaining a roughness height that is a small fraction of the boundary-layer thickness. In this investigation, the root

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31

Taylor, Robert Ian. "Rough Surface Contact Modelling—A Review." Lubricants 10, no. 5 (2022): 98. http://dx.doi.org/10.3390/lubricants10050098.

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It has been shown experimentally that boundary friction is proportional to load (commonly known as Amontons’ law) for more than 500 years, and the fact that it holds true over many scales (from microns to kilometres, and from nano-Newtons to Mega-Newtons) and for materials which deform both elastically and plastically has been the subject of much research, in order to more fully understand its wide applicability (and also to find any deviations from the law). Attempts to explain and understand Amontons’ law recognise that real surfaces are rough; as such, many researchers have studied the cont

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32

NOTT, PRABHU R. "Boundary conditions at a rigid wall for rough granular gases." Journal of Fluid Mechanics 678 (April 18, 2011): 179–202. http://dx.doi.org/10.1017/jfm.2011.105.

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We derive boundary conditions at a rigid wall for a granular material comprising rough, inelastic particles. Our analysis is confined to the rapid flow, or granular gas, regime in which grains interact by impulsive collisions. We use the Chapman–Enskog expansion in the kinetic theory of dense gases, extended for inelastic and rough particles, to determine the relevant fluxes to the wall. As in previous studies, we assume that the particles are spheres, and that the wall is corrugated by hemispheres rigidly attached to it. Collisions between the particles and the wall hemispheres are characteri

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33

Leighton, M., N. Morris, M. Gore, R. Rahmani, H. Rahnejat, and PD King. "Boundary interactions of rough non-Gaussian surfaces." Proceedings of the Institution of Mechanical Engineers, Part J: Journal of Engineering Tribology 230, no. 11 (2016): 1359–70. http://dx.doi.org/10.1177/1350650116656967.

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Bandyopadhyay, Promode R., and Ralph D. Watson. "Structure of rough-wall turbulent boundary layers." Physics of Fluids 31, no. 7 (1988): 1877. http://dx.doi.org/10.1063/1.866686.

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CASTRO, IAN P. "Rough-wall boundary layers: mean flow universality." Journal of Fluid Mechanics 585 (August 7, 2007): 469–85. http://dx.doi.org/10.1017/s0022112007006921.

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Mean flow profiles, skin friction, and integral parameters for boundary layers developing naturally over a wide variety of fully aerodynamically rough surfaces are presented and discussed. The momentum thickness Reynolds number Reθ extends to values in excess of 47000 and, unlike previous work, a very wide range of the ratio of roughness element height to boundary-layer depth is covered (0.03 < h/δ > 0.5). Comparisons are made with some classical formulations based on the assumption of a universal two-parameter form for the mean velocity profile, and also with other recent measurements.

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36

Hsu, Tai-Wen, and Shan-Hwei Ou. "Wave boundary layers in rough turbulent flow." Ocean Engineering 24, no. 1 (1997): 25–43. http://dx.doi.org/10.1016/0029-8018(95)00074-7.

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Yamakita, Tomonori, Katsuki Goto, Jun Yoshida, Hidemiki Kawashima, and Yoshiyuki Tsuji. "236 Turbulent Boundary Layer over Rough-wall." Proceedings of Conference of Tokai Branch 2013.62 (2013): 143–44. http://dx.doi.org/10.1299/jsmetokai.2013.62.143.

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Loureiro, J. B. R., and A. P. Silva Freire. "Transient thermal boundary layers over rough surfaces." International Journal of Heat and Mass Transfer 71 (April 2014): 217–27. http://dx.doi.org/10.1016/j.ijheatmasstransfer.2013.11.076.

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Vanderwel, Christina, and Bharathram Ganapathisubramani. "Turbulent Boundary Layers Over Multiscale Rough Patches." Boundary-Layer Meteorology 172, no. 1 (2019): 1–16. http://dx.doi.org/10.1007/s10546-019-00430-x.

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Ali, Sk Zeeshan, and Subhasish Dey. "Origin of the scaling laws of developing turbulent boundary layers." Physics of Fluids 34, no. 7 (2022): 071402. http://dx.doi.org/10.1063/5.0096255.

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In this Perspective article, we seek the origin of the scaling laws of developing turbulent boundary layers over a flat plate from the perspective of the phenomenological theory of turbulence. The scaling laws of the boundary-layer thickness and the boundary shear stress in rough and smooth boundary-layer flows are established. In a rough boundary-layer flow, the boundary-layer thickness (scaled with the boundary roughness) and the boundary shear stress (scaled with the dynamic pressure) obey the “2/(1− σ)” and “(1+ σ)/(1− σ)” scaling laws, respectively, with the streamwise distance (scaled wi

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41

Veran, Stéphanie, Yvan Aspa, and Michel Quintard. "Effective boundary conditions for rough reactive walls in laminar boundary layers." International Journal of Heat and Mass Transfer 52, no. 15-16 (2009): 3712–25. http://dx.doi.org/10.1016/j.ijheatmasstransfer.2009.01.045.

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Talluru, K. M., L. Djenidi, Md Kamruzzaman, and R. A. Antonia. "Self-preservation in a zero pressure gradient rough-wall turbulent boundary layer." Journal of Fluid Mechanics 788 (December 22, 2015): 57–69. http://dx.doi.org/10.1017/jfm.2015.665.

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A self-preservation (SP) analysis is carried out for a zero pressure gradient (ZPG) rough-wall turbulent boundary layer with a view to establishing the requirements of complete SP (i.e. SP across the entire layer) and determining if these are achievable. The analysis shows that SP is achievable in certain rough-wall boundary layers (irrespectively of the Reynolds number$Re$), when the mean viscous stress is zero or negligible compared to the form drag across the entire boundary layer. In this case, the velocity scale$u^{\ast }$must be constant, the length scale$l$should vary linearly with the

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Liu, Xiaobo. "Modeling seismic waves in ocean with the presence of irregular seabed and rough sea surface." Journal of Geophysics and Engineering 20, no. 1 (2023): 49–66. http://dx.doi.org/10.1093/jge/gxac093.

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Abstract For the simulation of seismic wavefields in the ocean, it is very important to consider the influences of the irregular seabed and the rough sea surface. To numerically model seismic waves in the ocean, the fluid seawater and the solid seabed must be treated separately, and the air–fluid and fluid–solid boundary conditions must be considered simultaneously. A fluid–solid configuration is created with the influences of a rough sea surface and an irregular seabed to carry out wavefield simulation. Based on the boundary conformal grids, the 2D acoustic wave equations (in the fluid media)

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Кюркчан, А. Г., та С. А. Маненков. "Применение модифицированного метода дискретных источников и метода диаграммных уравнений к решению задачи дифракции волн на теле с шероховатой границей". Оптика и спектроскопия 129, № 9 (2021): 1156. http://dx.doi.org/10.21883/os.2021.09.51343.2113-21.

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A two-dimensional problem of diffraction on a cylindrical body with a rough boundary is considered. In this work, two aspects of the problem of diffraction on the body with irregular boundary are investigated. First, the problem of diffraction by bodies with random perturbations of the boundary is considered. As an example, diffraction by a rough circular cylinder is considered. The results of calculating the averaged scattering diagram obtained using the modified method of discrete sources are compared with the results obtained using the method of small perturbations. The second goal of this

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Jensen, B. L., B. M. Sumer, and J. Fredsøe. "Turbulent oscillatory boundary layers at high Reynolds numbers." Journal of Fluid Mechanics 206 (September 1989): 265–97. http://dx.doi.org/10.1017/s0022112089002302.

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This study deals with turbulent oscillatory boundary-layer flows over both smooth and rough beds. The free-stream flow is a purely oscillating flow with sinusoidal velocity variation. Mean and turbulence properties were measured mainly in two directions, namely in the streamwise direction and in the direction perpendicular to the bed. Some measurements were made also in the transverse direction. The measurements were carried out up to Re = 6 × 106 over a mirror-shine smooth bed and over rough beds with various values of the parameter a/ks covering the range from approximately 400 to 3700, a be

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Hsu, John R. C. "ROUGH TURBULENT BOUNDARY LAYER IN SHORT-CRESTED WAVES." Coastal Engineering Proceedings 1, no. 20 (1986): 21. http://dx.doi.org/10.9753/icce.v20.21.

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Prior to the investigation of rough turbulent boundary layer in a short-crested wave, the oscillatory laminar boundary layer at the bed is considered. Supported by numerical results of water-particle motions close to the bottom, the general patterns of kinematics in the laminar boundary layer within this wave system are reported in order to promote the understanding of the complex phenomenon. To propose a suitable method for turbulent boundary layer within such a wave system, a two-layer model using time-independent viscosity coefficient is first studied. Potential application of this model to

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Yang, Jie, Taihua Xu, and Fan Zhao. "Modified Uncertainty Measure of Rough Fuzzy Sets from the Perspective of Fuzzy Distance." Mathematical Problems in Engineering 2018 (August 6, 2018): 1–11. http://dx.doi.org/10.1155/2018/4160905.

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As an extension of Pawlak’s rough sets, rough fuzzy sets are proposed to deal with fuzzy target concept. As we know, the uncertainty of Pawlak’s rough sets is rooted in the objects contained in the boundary region, while the uncertainty of rough fuzzy sets comes from three regions (positive region, boundary region, and negative region). In addition, in the view of traditional uncertainty measures, the two rough approximation spaces with the same uncertainty are not necessarily equivalent, and they cannot be distinguished. In this paper, firstly, a fuzziness-based uncertainty measure is propose

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Mocenni, C., E. Sparacino, and J. P. Zubelli. "Effective rough boundary parametrization for reaction-diffusion systems." Applicable Analysis and Discrete Mathematics 8, no. 1 (2014): 33–59. http://dx.doi.org/10.2298/aadm140126002m.

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We address the problem of parametrizing the boundary data for reaction- diffusion partial differential equations associated to distributed systems that possess rough boundaries. The boundaries are modeled as fast oscillating periodic structures and are endowed with Neumann or Dirichlet boundary conditions. Using techniques from homogenization theory and multiple-scale analysis we derive the effective equation and boundary conditions that are satisfied by the homogenized solution. We present numerical simulations that validate our theoretical results and compare it with the alternative approach

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Bergstrom, D. J., O. G. Akinlade, and M. F. Tachie. "Skin Friction Correlation for Smooth and Rough Wall Turbulent Boundary Layers." Journal of Fluids Engineering 127, no. 6 (2005): 1146–53. http://dx.doi.org/10.1115/1.2073288.

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In this paper, we propose a novel skin friction correlation for a zero pressure gradient turbulent boundary layer over surfaces with different roughness characteristics. The experimental data sets were obtained on a hydraulically smooth and ten different rough surfaces created from sand paper, perforated sheet, and woven wire mesh. The physical size and geometry of the roughness elements and freestream velocity were chosen to encompass both transitionally rough and fully rough flow regimes. The flow Reynolds number based on momentum thickness ranged from 3730 to 13,550. We propose a correlatio

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Guo, Zhi Lin. "Uncertainty Analysis for One Direction Singular Rough Sets System." Advanced Materials Research 671-674 (March 2013): 3170–73. http://dx.doi.org/10.4028/www.scientific.net/amr.671-674.3170.

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In view of the system uncertainty due to the variety of singular rough sets， boundary, the definitions of inside and outside boundary are given. Some properties of inside and outside boundary are discussed, and the measure of relative precision is provided. Furthermore, a approximate method which aims at dealing with system uncertainty is also obtained.

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