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Journal articles on the topic 'Surface velocity field'

Author: Grafiati

Published: 25 May 2024

Last updated: 19 July 2025

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1

Yuan, Xinzhe, Jian Wang, Bing Han, and Xiaoqing Wang. "Study on the Elimination Method of Wind Field Influence in Retrieving a Sea Surface Current Field." Sensors 22, no. 22 (2022): 8781. http://dx.doi.org/10.3390/s22228781.

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An along-the-track interferometric synthetic aperture radar (ATI-SAR) system can estimate the radial velocity of a moving target on the ground and on a sea surface current. This acquires the interference phase by combining two composite SAR images obtained by two antennas spatially separated along the direction of movement of the platform. The key to retrieving the sea surface current is to remove the interference of sea surface waves, wind-generated current, and Bragg phase velocity in the interference Doppler velocity. Previous methods removed the surface waves, Bragg phase velocity, and oth

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2

Gonçalves, Rafael C., Mohamed Iskandarani, Tamay Özgökmen, and W. Carlisle Thacker. "Reconstruction of Submesoscale Velocity Field from Surface Drifters." Journal of Physical Oceanography 49, no. 4 (2019): 941–58. http://dx.doi.org/10.1175/jpo-d-18-0025.1.

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AbstractThe extensive drifter deployment during the Lagrangian Submesoscale Experiment (LASER) provided observations of the surface velocity field in the northern Gulf of Mexico with high resolution in space and time. Here, we estimate the submesoscale velocity field sampled by those drifters using a procedure that statistically interpolates these data both spatially and temporally. Because the spacing of the drifters evolves with the flow, causing the resolution that they provide to vary in space and time, it is important to be able to characterize where and when the estimated velocity field

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3

Kim, Joon Hyun, and Joo-Hyun Kim. "Thermohydrodynamic Analysis of Surface Roughness in the Flow Field." Journal of Tribology 127, no. 2 (2005): 293–301. http://dx.doi.org/10.1115/1.1828072.

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The study deals with the development of a thermohydrodynamic (THD) computational procedure for evaluating the pressure, temperature, and velocity distributions in fluid films with a very rough geometry. A parametric investigation is performed to predict the bearing behaviors in the lubricating film with the absorbed layers and their interfaces as determined by rough surfaces with Gaussian distribution. The layers are expressed as functions of the standard deviations of each surface to characterize flow patterns between both rough surfaces. Velocity variations and heat generation are assumed to

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4

Melville, W. K., and Ronald J. Rapp. "The surface velocity field in steep and breaking waves." Journal of Fluid Mechanics 189 (April 1988): 1–22. http://dx.doi.org/10.1017/s0022112088000898.

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Coincident simultaneous measurements of the surface displacement and the horizontal velocity at the surface of steep and breaking waves are presented. The measurements involve a novel use of laser anemometry at the fluctuating air-water interface and clearly show the limitations of surface displacement measurements in characterizing steep and breaking wave fields. The measurements are used to examine the evolution of the surface drift velocity, spectra, wave envelopes, and forced long waves in unstable deep-water waves. Preliminary results of this work were reported by Melville & Rapp (198

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BAL, GUILLAUME, and KUI REN. "RECONSTRUCTION OF SINGULAR SURFACES BY SHAPE SENSITIVITY ANALYSIS AND LEVEL SET METHOD." Mathematical Models and Methods in Applied Sciences 16, no. 08 (2006): 1347–73. http://dx.doi.org/10.1142/s021820250600156x.

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We consider the reconstruction of singular surfaces from the over-determined boundary conditions of an elliptic problem. The problem arises in optical and impedance tomography, where void-like structure or cracks may be modeled as diffusion processes supported on co-dimension one surfaces. The reconstruction of such surfaces is obtained theoretically and numerically by combining a shape sensitivity analysis with a level set method. The shape sensitivity analysis is used to define a velocity field, which allows us to update the surface while decreasing a given cost function, which quantifies th

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6

Li, Chang He, Zhen Lu Han, and Jing Yao Li. "Investigation into Fluid Velocity Field of Wedge-Shaped Gap in Grinding." Applied Mechanics and Materials 37-38 (November 2010): 593–98. http://dx.doi.org/10.4028/www.scientific.net/amm.37-38.593.

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In the grinding process, grinding fluid is delivered for the purposes of chip flushing, cooling, lubrication and chemical protection of work surface. Hence, the conventional method of flood delivering coolant fluid by a nozzle in order to achieve high process performance purposivelly. However, hydrodynamic fluid pressure can be generated ahead of the grinding zone due to the wedge effect between wheel peripheral surface and part surface. In this paper, a theoretical fluid velocity field modeling is presented for flow of coolant fluid of wedge-shaped gap in flood delivery surface grinding, whic

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7

Lloyd, Peter M., Peter K. Stansby, and David J. Ball. "Unsteady surface-velocity field measurement using particle tracking velocimetry." Journal of Hydraulic Research 33, no. 4 (1995): 519–34. http://dx.doi.org/10.1080/00221689509498658.

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8

Arnold, E., T. Letavic, and S. Herko. "High-field electron velocity in silicon surface-accumulation layers." IEEE Electron Device Letters 20, no. 9 (1999): 490–92. http://dx.doi.org/10.1109/55.784462.

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9

Yan, He, Qianru Hou, Guodong Jin, Xing Xu, Gong Zhang, and Daiyin Zhu. "Velocity Estimation of Ocean Surface Currents in along-Track InSAR System Based on Conditional Generative Adversarial Networks." Remote Sensing 13, no. 20 (2021): 4088. http://dx.doi.org/10.3390/rs13204088.

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Velocity estimation of ocean surface currents is of great significance in the fields of the fishery, shipping, sewage discharge, and military affairs. Over the last decade, along-track interferometric synthetic aperture radar (along-track InSAR) has been demonstrated to be one of the important instruments for large-area and high-resolution ocean surface current velocity estimation. The calculation method of the traditional ocean surface current velocity, as influenced by the large-scale wave orbital velocity and the Bragg wave phase velocity, cannot easily separate the current velocity, charac

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10

Yan, He, Qianru Hou, Guodong Jin, Xing Xu, Gong Zhang, and Daiyin Zhu. "Velocity Estimation of Ocean Surface Currents in along-Track InSAR System Based on Conditional Generative Adversarial Networks." Remote Sensing 13, no. 20 (2021): 4088. http://dx.doi.org/10.3390/rs13204088.

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Velocity estimation of ocean surface currents is of great significance in the fields of the fishery, shipping, sewage discharge, and military affairs. Over the last decade, along-track interferometric synthetic aperture radar (along-track InSAR) has been demonstrated to be one of the important instruments for large-area and high-resolution ocean surface current velocity estimation. The calculation method of the traditional ocean surface current velocity, as influenced by the large-scale wave orbital velocity and the Bragg wave phase velocity, cannot easily separate the current velocity, charac

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11

Ali, Fatima, Jan G. Wissink, and Herlina Herlina. "Modeling air-water heat transfer induced by buoyant convection." International Journal of Computational Physics Series 1, no. 2 (2018): 15–16. http://dx.doi.org/10.29167/a1i2p15-16.

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The instantaneous 2D velocity field obtained at the air-water interface in previously performed direct numerical simulations (DNS) of interfacial heat transfer driven by buoyant convective instability is used to estimate the heat transfer velocity [2]. After reconstructing the three-dimensional velocity field immediately underneath the surface, a Lagrangian particle tracking method was used to assess the surface age. The surface heat transfer velocity, obtained using Danckwerts’ surface renewal model, was found to underestimate the heat transfer velocity acquired directly from the DNS data by

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12

Hosokawa, Y., and K. Furukawa. "Surface Flow and Particle Settling in a Coastal Reed Field." Water Science and Technology 29, no. 4 (1994): 45–53. http://dx.doi.org/10.2166/wst.1994.0154.

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Hydraulic roughness of reed stems in shallow surface flow under low current velocity is discussed. The roughness coefficient, defined as a Manning's formula, depends upon depth and velocity in this flow. Depth and velocity, in turn, are altered by roughness through water surface slope. The interaction between these three parameters must be solved simultaneously for the prediction of the surface flow in a reed wetland. Stem roughness can be expressed as a function of Reynolds' number, similar to that for a single cylinder. Assigning this function, an iteration method easily gives us a suitable

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13

Gunda, Rajendra, and Sandeep Vijayakar. "Computing Radiated Sound Power using Quadratic Power Transfer Vector (QPTV)." INTER-NOISE and NOISE-CON Congress and Conference Proceedings 263, no. 2 (2021): 4257–67. http://dx.doi.org/10.3397/in-2021-2643.

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Pressure Acoustic Transfer Functions or Vectors (PATVs) relate the surface velocity of a structure to the sound pressure level at a field point in the surrounding fluid. These functions depend only on the structure geometry, properties of the fluid medium (sound speed and characteristic density), the excitation frequency and the location of the field point, but are independent of the surface velocity values themselves. Once the pressure acoustic transfer function is computed between a structure and a specified field point, we can compute pressure at this point for any boundary velocity distrib

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Lin, Yao Tsung, Shyh Shin Hwang, and Jun An Zhu. "The Study of Velocity Field in Front Opening Unified Pod by CAE." Engineering Innovations 7 (October 13, 2023): 89–94. http://dx.doi.org/10.4028/p-uq3dz7.

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The front opening unified pod (FOUP) is a packing box for contamination control for semiconductor wafer transport. As the wafer fabrication process developes towards nanoor atom level, the semiconductor wafer storage device should advance from the particle prevention function into the airborne molecular contamination (AMC) removal function. Therefore, it is necessary to design/redesign a function for removing AMC or moisture inside the FOUP. This study used the design of leading diffuser tubes in the FOUP and pores in the surfaces of diffuser tubes to generate gas diffusion. This is to achieve

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15

Zhiwang, Gan, Chen Zhitong, and Zhou Meng. "Approaching the characteristic curve of the cutter’s envelope based on a velocity field." Proceedings of the Institution of Mechanical Engineers, Part B: Journal of Engineering Manufacture 231, no. 11 (2016): 1904–16. http://dx.doi.org/10.1177/0954405415616788.

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The characteristic curve of the envelope generated by the tool motions is an important medium for measuring the distance between the tool and the desired surface. Via the single parametric surface envelope theory in differential geometry, this article proved the correctness of the characteristic curve obtained by minimum distance pairs. Simultaneously, combined with the existing envelope theory and the longitude method, an algorithm based on a velocity field is proposed to approach the characteristic curve. The torus cutter is first dispersed into longitudes and then the characteristic point o

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16

Noblesse, Francis, Chi Yang, and Xiao-Bo Chen. "Boundary-Integral Representation of Linear Free-Surface Potential Flows." Journal of Ship Research 41, no. 01 (1997): 10–16. http://dx.doi.org/10.5957/jsr.1997.41.1.10.

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A new potential-flow representation, which defines the velocity field ∇ϕ in a potential flow region explicitly in terms of the velocity distribution (u,v,w) at a boundary surface E, is given for the case of wave diffraction-radiation by a ship. This flow representation does not involve the potential ϕ at ϵ (unlike the usual Green identity which expresses ϕ within a flow domain in terms of boundary values of ϕ and ∂ϕ/∂n) and defines the velocity field ∇ϕ directly (i.e., not via numerical differentiation of ϕ). The new flow representation can be useful for extending a given near-field flow into

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17

SAVELSBERG, RALPH, and WILLEM VAN DE WATER. "Experiments on free-surface turbulence." Journal of Fluid Mechanics 619 (January 25, 2009): 95–125. http://dx.doi.org/10.1017/s0022112008004369.

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We study the free surface of a turbulent flow, in particular the relation between the statistical properties of the wrinkled surface and those of the velocity field beneath it. Channel flow turbulence is generated using an active grid. Through a judicial choice of the stirring protocol the anisotropy of the subsurface turbulence can be controlled. The largest Taylor Reynolds number obtained is Reλ = 258. We characterize the homogeneity and isotropy of the flow and discuss Taylor's frozen turbulence hypothesis, which applies to the subsurface turbulence but not to the surface. The surface gradi

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Abrosimov, V. I., and O. I. Davidovskaya. "Vortex dipole response in the giant dipole resonance energy region." Nuclear Physics and Atomic Energy 10, no. 1 (2009): 20–25. https://doi.org/10.15407/jnpae2009.01.020.

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The velocity fields associated with isovector excitations of spherical nuclei in the giant dipole resonance (GDR) energy region have been studied within a semiclassical approach based on the solution of the Vlasov kinetic equation for finite two-component Fermi systems with a moving surface. The neutron-proton asymmetry and dynamical surface effects lead to the fragmentation of the isovector dipole strength in the energy region of the GDR on two resonances. It was found that the velocity field has a potential character in the energy range near the main (low-energy) maximum of the GDR. However,

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19

Çakır, Özcan, and Nart Coşkun. "LOVE SURFACE WAVES AND ELECTRICAL RESISTIVITY USED TO DELINEATE THE NEAR SURFACE GEOPHYSICAL STRUCTURE: THEORETICAL CONSIDERATIONS." Earth Science Malaysia 5, no. 2 (2020): 104–13. http://dx.doi.org/10.26480/esmy.02.2021.104.113.

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We invert Love surface waves and electrical resistivities to cooperatively examine the physical properties of the depth range shallower than 50-m. To analyze this depth range is essential for earthquake mitigation efforts. The shear-wave velocity (VS30) is particularly important to describe the dynamic characteristics of shallow Earth. The Love surface waves are treated in terms of both phase and group velocities. The phase velocities are obtained from the slant stacking while for the group velocities the multiple filter technique is utilized. A typical shot-gather is assumed to simulate the f

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KACHURIN, NIKOLAY, DMITRY PROKHOROV, DMITRY AMBARTSUMOV, and IVAN EROGIN. "AEROGASDYNAMICS AND DUST TRANSPORT OF ANTHROPOGENIC MINERAL FORMATIONS." News of the Tula state university. Sciences of Earth 1, no. 1 (2023): 531–43. http://dx.doi.org/10.46689/2218-5194-2023-1-1-531-543.

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Of particular interest is the fact that when modeling the convective-turbulent diffusion of dust and gas pollutants, one can use a one-dimensional parabolic type equation, where the convective term will be determined by the wind speed in the surface layer, since the velocity field in the surface layer quickly levels out. The areas of dusty surfaces of a conical AMF do not exceed 60% of its total surface area. When flowing around a spinal-shaped AMT, the air velocity fields can exceed the value of the blow-off velocity of solid particles by almost 30 % of the AMF surface area. At the next stage

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21

Gecha, V. Ya, M. Yu Zhilenev, V. B. Fyodorov, D. A. Khrychev, Yu I. Hudak, and A. V. Shatina. "Velocity field of image points in satellite imagery of planet’s surface." Russian Technological Journal 8, no. 1 (2020): 97–109. http://dx.doi.org/10.32362/2500-316x-2020-8-1-97-109.

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This paper derives a formula for calculating the velocity of arbitrary point in the field of view of the satellite camera in the process of orbital imagery of the planet's surface. The formula describes the velocity as a function of the point coordinates in the image fixation plane, the focal length of the imaging camera, the orbital parameters of the satellite, the angular velocity of the planet’s rotation, the coordinates of the satellite’s true anomaly in the orbit, the orientation angles of the imaging camera relative to the orbit, and the angular velocity of the camera. The paper also pro

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Sugiyama, Shin, Daiki Sakakibara, Satoshi Matsuno, Satoru Yamaguchi, Sumito Matoba, and Teruo Aoki. "Initial field observations on Qaanaaq ice cap, northwestern Greenland." Annals of Glaciology 55, no. 66 (2014): 25–33. http://dx.doi.org/10.3189/2014aog66a102.

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AbstractTo study the glaciological processes controlling the mass budget of Greenland’s peripheral glaciers and ice caps, field measurements were carried out on Qaanaaq ice cap, a 20 km long ice cap in northwestern Greenland. In the summer of 2012, we measured surface melt rate, ice flow velocity and ice thickness along a survey route spanning the ice margin (200m a.s.l.) to the ice-cap summit (1110m a.s.l.). Melt rates in the ablation area were clearly influenced by dark materials covering the ice surface, where degree-day factors varied from 5.44 mm w.e. K–1 d–1 on a clean surface to 8.26 mm

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Chaudhary, K., A. Sharma, and A. K. Jha. "Laminar Mixed Convection Flow from a Vertical Surface with Induced Magnetic Field and Convective Boundary." International Journal of Applied Mechanics and Engineering 23, no. 2 (2018): 307–26. http://dx.doi.org/10.2478/ijame-2018-0017.

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AbstractThe objective of this investigation is to study the influence of thermal radiation and radiation absorption parameter on a mixed convection flow over a continuously moving porous vertical plate under the action of transverse applied magnetic field taking into account the induced magnetic field with convective boundary. Under certain assumptions, the solutions for the velocity field, temperature distribution and induced magnetic field are obtained. The influences of various parameters on the velocity, temperature fields and on induced magnetic fields are studied graphically. It is also

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Decker, Luke, and Sergey Fomel. "A variational approach for picking optimal surfaces from semblance-like panels." GEOPHYSICS 87, no. 3 (2022): U93—U108. http://dx.doi.org/10.1190/geo2021-0336.1.

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We propose and examine a variational method for determining optimal velocity fields from semblance-like volumes using continuation. The proposed approach finds a minimal-cost surface through a volume, which often corresponds to a velocity field within a semblance scan. This allows picked velocity fields to incorporate information from gathers that are spatially near the midpoint in question. The minimization process amounts to solving a nonlinear elliptic partial differential equation, which is accomplished by changing the elliptic problem to a parabolic one and solving it iteratively until it

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Theule, Joshua I., Stefano Crema, Lorenzo Marchi, Marco Cavalli, and Francesco Comiti. "Exploiting LSPIV to assess debris-flow velocities in the field." Natural Hazards and Earth System Sciences 18, no. 1 (2018): 1–13. http://dx.doi.org/10.5194/nhess-18-1-2018.

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Abstract. The assessment of flow velocity has a central role in quantitative analysis of debris flows, both for the characterization of the phenomenology of these processes and for the assessment of related hazards. Large-scale particle image velocimetry (LSPIV) can contribute to the assessment of surface velocity of debris flows, provided that the specific features of these processes (e.g. fast stage variations and particles up to boulder size on the flow surface) are taken into account. Three debris-flow events, each of them consisting of several surges featuring different sediment concentra

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Bindschadler, R. A., M. A. Fahnestock, P. Skvarca, and T. A. Scambos. "Surface-velocity field of the northern Larsen Ice Shelf, Antarctica." Annals of Glaciology 20 (1994): 319–26. http://dx.doi.org/10.3189/1994aog20-1-319-326.

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Three satellite images of the northern Larsen Ice Shelf arc used to derive velocity fields for the periods 1975–86 and 1986 89. Substantial increases in the speed of the ice between these periods are detected to a high degree of confidence. Ice which entered the ice shelf between Fothergill Point and Cape Worsley and ice from Drygalski Glacier has accelerated by approximately 15% over the measurement period. Ice from Bombardier and Dinsmoor Glaciers also exhibits acceleration but by a lesser amount. These accelerations may be the result of either significant retreat experienced by the ice shel

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Inaba, H., Y. Itakura, and M. Kasahara. "Surface velocity computation of debris flows by vector field measurements." Physics and Chemistry of the Earth, Part B: Hydrology, Oceans and Atmosphere 25, no. 9 (2000): 741–44. http://dx.doi.org/10.1016/s1464-1909(00)00095-2.

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Bindschadler, R. A., M. A. Fahnestock, P. Skvarca, and T. A. Scambos. "Surface-velocity field of the northern Larsen Ice Shelf, Antarctica." Annals of Glaciology 20 (1994): 319–26. http://dx.doi.org/10.1017/s0260305500016633.

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Three satellite images of the northern Larsen Ice Shelf arc used to derive velocity fields for the periods 1975–86 and 1986 89. Substantial increases in the speed of the ice between these periods are detected to a high degree of confidence. Ice which entered the ice shelf between Fothergill Point and Cape Worsley and ice from Drygalski Glacier has accelerated by approximately 15% over the measurement period. Ice from Bombardier and Dinsmoor Glaciers also exhibits acceleration but by a lesser amount. These accelerations may be the result of either significant retreat experienced by the ice shel

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29

Weidle, Christian. "Surface wave phase velocity maps from multiscale wave field interpolation." Computational Geosciences 16, no. 3 (2011): 535–49. http://dx.doi.org/10.1007/s10596-011-9269-8.

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Paradkar, B. S., S. M. Chitre, and V. Krishan. "Mean field solar surface dynamo in the presence of partially ionized plasmas and sub-surface shear layer." Monthly Notices of the Royal Astronomical Society 488, no. 3 (2019): 4329–37. http://dx.doi.org/10.1093/mnras/stz2008.

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Abstract A non-linear α − Ω dynamo in the partially ionized turbulent plasma in the presence of sub-surface velocity shear is studied with mean-field electrodynamics. Such a dynamo is probably operational in the near-surface region of the Sun, where the presence of both neutrals and the velocity shear (due to sub-surface shear layer in the rotation profile) is observationally well established. In particular, we show that the inclusion of ambipolar diffusion leads to a saturation of magnetic field amplitudes in the α − Ω dynamo. We also demonstrate that the temporal evolution of large-scale glo

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Sutherland, Peter, and W. Kendall Melville. "Measuring Turbulent Kinetic Energy Dissipation at a Wavy Sea Surface." Journal of Atmospheric and Oceanic Technology 32, no. 8 (2015): 1498–514. http://dx.doi.org/10.1175/jtech-d-14-00227.1.

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AbstractWave breaking is thought to be the dominant mechanism for energy loss by the surface wave field. Breaking results in energetic and highly turbulent velocity fields, concentrated within approximately one wave height of the surface. To make meaningful estimates of wave energy dissipation in the upper ocean, it is then necessary to make accurate measurements of turbulent kinetic energy (TKE) dissipation very near the surface. However, the surface wave field makes measurements of turbulence at the air–sea interface challenging since the energy spectrum contains energy from both waves and t

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Yang, Yuande, Bo Sun, Zemin Wang, et al. "GPS-derived velocity and strain fields around Dome Argus, Antarctica." Journal of Glaciology 60, no. 222 (2014): 735–42. http://dx.doi.org/10.3189/2014jog14j078.

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AbstractKnowledge of the surface topography, velocity field and strain field at an ice-core site is critical to the accurate interpretation of ice-core records. At Dome Argus (Dome A), where a Chinese deep ice-core drilling project is being carried out, we have produced an accurate surface digital elevation model from GPS measurements in January 2013 at 47 sites. We identify two peaks at Dome A, with the northern peak ~7 cm higher than the southern peak. Repeat GPS measurements at 12 sites in 2008 and 2013 provide a surface velocity field around the dome. The surface velocity ranges from 3.1±2

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RADWAN, AHMED E. "ALFVEN SURFACE WAVES ALONG ANNULAR GAS JET SURROUNDING TAR COLUMN UNDER OBLIQUE VARYING MAGNETIC FIELD." Tamkang Journal of Mathematics 28, no. 2 (1997): 127–33. http://dx.doi.org/10.5556/j.tkjm.28.1997.4326.

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The MFD oscillating Alfven surface waves along a perfectly conducting annular gas jct surrounding a tar column under oblique varying magnetic field has been discussed. Numerous reported works could be recovered as limiting cases. The axial magnetic fields interior and exterior the model are stabilizing while the tenuous azimuthal field is so or not according to restrictions. The thicker the tar column the larger its stabilizing influence; and the oscillation states arc slowed down so easier observations are allowed than in the classical case of full fluid jet in vacuum with constant magnetic f

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Duru, C. A., S. A. Ugwu, and H. O. Nwankwoala. "Velocity Modeling for Structural Traps Evaluation and Interpretation of TM-Field in Niger Delta." International Journal of Geology and Earth Sciences 4, no. 4 (2018): 1–13. https://doi.org/10.32937/IJGES.4.4.2018.1-13.

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The quest for optimization in the Oil and Gas Exploration and Production (E&P) industry has been the driving force for the innovation trends experienced in the industry. Amongst others, velocity modelling module has led to the accurate and precise velocity determination for complete interpretation of subsurface inhomogeneity and true depth positioning from the generated time section of the surfaces of TM-Field located between longitudes 6p77’80.11 - 6p80’77.71 (Easting) and latitudes 4p61’74.50 – 4p62’93.33 (Northing) within the western region of the Niger Del

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Xu, Pei, Jixiang Chen, Yingchun Guo, and Wanzhen Luo. "Comparative Study on Hydrodynamic Characteristics of Under-Water Vehicles Near Free Surface and Near Ice Surface." Journal of Marine Science and Engineering 12, no. 12 (2024): 2131. http://dx.doi.org/10.3390/jmse12122131.

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In this paper, the commercial computational fluid dynamics software STAR-CCM+ (18.04.008-R8) is utilized to analyze the hydrodynamic performance of BB2 underwater vehicles under various navigation conditions, as well as the flow field disturbances caused by the free surface and ice surface during navigation. After dividing the computational domains based on different navigation scenarios, numerical simulations are conducted for BB2 underwater vehicles (without a propeller) at infinite depth, near the free surface, and near the ice surface under various operating conditions. The analysis focuse

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Lee, Hyo-Geun, Hye-Woo Kim, Jae-Yoon Jeon, Sang-Hyun Kim, Mu-Yeong Seo, and Kwang-Jun Paik. "The Research on Collision Avoidance Algorithm of Autonomous Surface Vessel using Vector Field Histogram and Velocity Obstacle Method." Journal of the Korean Association of Defense Industry Studies 31, no. 2 (2024): 133–45. http://dx.doi.org/10.52798/kadis.2024.31.2.11.

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Hao, J. "Recovering the Pulsation Velocity Distribution on Stellar Surface." Symposium - International Astronomical Union 185 (1998): 383–84. http://dx.doi.org/10.1017/s0074180900238989.

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The analytical expression between the line profile and its corresponding pulsation velocity field is derived by the assumption of Doppler Imaging (DI). Based on this approach, numerical experiments of the recovery of the one dimensional nonradial pulsation velocity distribution from the residual line profiles are presented.

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Zhang, Enzhan, Liang Li, Weiche Huang, et al. "Measuring Velocity and Discharge of High Turbidity Rivers Using an Improved Near-Field Remote-Sensing Measurement System." Water 16, no. 1 (2023): 135. http://dx.doi.org/10.3390/w16010135.

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Large-scale particle image velocimetry (LSPIV) is a computer vision-based technique renowned for its precise and efficient measurement of river surface velocity. However, a crucial prerequisite for utilizing LSPIV involves camera calibration. Conventional techniques rely on ground control points, thus restricting their scope of application. This study introduced a near-field remote-sensing measurement system based on LSPIV, capable of accurately measuring river surface velocity sans reliance on ground control points. The system acquires gravity-acceleration data using a triaxial accelerometer

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Neves, Diogo R. C. B., Moisés Brito, António Alberto Pires-Silva, Conceição Juana Fortes, and Jorge Matos. "Experimental Investigation of Air Bubble Curtain Effects on Water Wave Field." Defect and Diffusion Forum 415 (April 27, 2022): 81–99. http://dx.doi.org/10.4028/p-9jm010.

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This paper studies the effects of an air bubble curtain on surface water waves. Water particle velocities and free surface elevations were measured simultaneously at two cross-shore locations downstream of the air bubble curtain. Measurements were carried out for regular waves using different air bubble curtain configurations. Free surface elevations were measured using resistive gauges and the instantaneous velocities were acquired using an Acoustic Doppler Velocimeter (ADV). The characteristics of the free surface elevation time series, velocity field and turbulence are analyzed and discusse

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Çakır, Özcan, and Nart Coşkun. "Theoretical Issues with Rayleigh Surface Waves and Geoelectrical Method Used for the Inversion of Near Surface Geophysical Structure." Journal of Human, Earth, and Future 2, no. 3 (2021): 183–99. http://dx.doi.org/10.28991/hef-2021-02-03-01.

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We numerically simulate the field measurements of Rayleigh surface waves and electrical resistivity in which the target depth is set to be less than 50-m. The Rayleigh surface waves are simulated in terms of fundamental mode group and phase velocities. The seismic field data is assumed to be collected through a conventional shot-gather. The group velocities are found from the application of the multiple filter technique in a single-station fashion while for the phase velocities the slant stacking, or linear radon transform are applied in fashion of multichannel analysis of surface waves (MASW)

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Moret, Geoff J. M., William P. Clement, Michael D. Knoll, and Warren Barrash. "VSP traveltime inversion: Near‐surface issues." GEOPHYSICS 69, no. 2 (2004): 345–51. http://dx.doi.org/10.1190/1.1707053.

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P‐wave velocity information obtained from vertical seismic profiles (VSPs) can be useful in imaging subsurface structure, either by directly detecting changes in the subsurface or as an aid to the interpretation of seismic reflection data. In the shallow subsurface, P‐wave velocity can change by nearly an order of magnitude over a short distance, so curved rays are needed to accurately model VSP traveltimes. We used a curved‐ray inversion to estimate the velocity profile and the discrepancy principle to estimate the data noise level and to choose the optimum regularization parameter. The curve

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Ульянов, Олег Николаевич, and Людмила Ильинична Рубина. "On irrotational vector fields with vector lines located on a given surface." Herald of Tver State University. Series: Applied Mathematics, no. 3(66) (December 1, 2022): 49–61. http://dx.doi.org/10.26456/vtpmk645.

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Рассматриваются безвихревые векторные поля на поверхности, заданной уравнением $a=z+\alpha(x,y,t)=0$. Изучаются условия, при выполнении которых векторные линии таких полей располагаются на этой поверхности. Получены достаточные условия существования гармонического векторного поля с такими векторными линиями. Изучена переопределенная система уравнений в частных производных, решение которой обеспечивает получение гармонического поля, векторные линии которого лежат на заданной поверхности рассматриваемого вида. Выписано уравнение поверхности, для которой можно найти гармоническое векторное поле с

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Hao, Cai Xia, Hai Ping Zhang, and Min Xia Hao. "Experimental Investigation of Using Solar Chimney to Induce Natural Ventilation." Applied Mechanics and Materials 672-674 (October 2014): 109–12. http://dx.doi.org/10.4028/www.scientific.net/amm.672-674.109.

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The vertical panels of solar chimney have internal dimensions of 2000mm height、1000mm length. Under the condition of heat flux and chimney gap variety, we research chimney interior velocity field. Experimental Results show that airflow increased with chimney gap augmentation, the airflow and air velocity augment with the increase of solar radiant intensity, and air velocity decreases with the increase of solar chimney gap. Air velocity is higher near the heated surfaces than it in the middle chimney. Meanwhile velocity boundary layers form near the heated surface.

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Beasley, Craig, and Walt Lynn. "The zero‐velocity layer: Migration from irregular surfaces." GEOPHYSICS 57, no. 11 (1992): 1435–43. http://dx.doi.org/10.1190/1.1443211.

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Seismic data acquired in areas with irregular topography are usually corrected to a flat datum before migration. A time‐honored technique for handling elevation changes is to time shift the data before application of migration. This simple time shift, or elevation‐static correction, cannot properly represent wide‐angle or dipping reflections as they would have been recorded at the datum. As a result, when elevation varies significantly, accuracy in event positioning may be compromised for migration and other wave‐equation processes, such as dip moveout processing (DMO). Traditionally, such ove

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Ko, B. "Reconstruction of surface velocity field using wavelet transformation and boundary-element method." Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 221, no. 2 (2007): 167–75. http://dx.doi.org/10.1243/0954406jmes319.

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This paper shows the application of discrete wavelet transformation (DWT) to inverse acoustics for reconstructing the surface velocity of a noise source. This approach uses the boundary-element analysis based on the measured sound pressure at a set of field points, the Helmholtz integral equations, and wavelet transformation to reconstruct the normal surface velocity field. The reconstructed velocity field can be diverged due to the small measurement errors in the case of nearfield acoustic holography using an inverse boundary-element method. In order to bypass the instability in the inverse p

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Ruchti, Tysum, Jonathan D. Blotter, and Scott D. Sommerfeldt. "Experimentally determining power flow in cylindrical shells using a scanning laser Doppler vibrometer." Journal of the Acoustical Society of America 151, no. 4 (2022): A227. http://dx.doi.org/10.1121/10.0011143.

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Power flow methods are used to identify energy sources and sinks in objects and to visualize transmission pathways. The most common method uses surface acceleration or velocity measurements and finite difference methods to compute power flow. In flat structures, a scanning laser Doppler vibrometer (SLDV) has been used to increase the measurement resolution. For more complicated surfaces, the general approach has been to use accelerometers at a few key points and measure transmission rather than seeking to get a full visualization of the power flow. This research uses a 3-D-SLDV to take surface

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Wang, Yufang, and Nannan Wang. "Influence of the Projectile Rotation on the Supersonic Fluidic Element." Aerospace 10, no. 1 (2022): 35. http://dx.doi.org/10.3390/aerospace10010035.

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The effects of projectile rotation on the internal and external flow fields of the supersonic fluidic element are numerically studied using sliding grid technique and the RNG k-ε turbulence model. The effects of rotating speed on internal and external flow fields, switching time and output characteristics are studied. The results show that: for the external flow field, there is no obvious change in the flow field structure at low angular velocity; when the angular velocity increases to 20 r/s, the flow field structure becomes obviously asymmetric due to the Coriolis force; the flow field far a

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Yao, Congcong, Chengpeng Lu, Wei Qin, and Jiayun Lu. "Field Experiments of Hyporheic Flow Affected by a Clay Lens." Water 11, no. 8 (2019): 1613. http://dx.doi.org/10.3390/w11081613.

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As a typical water exchange of surface water and groundwater, hyporheic flow widely exists in streambeds and is significantly affected by the characteristics of sediment and surface water. In this study, a low-permeability clay lens was chosen to investigate the influence of the streambed heterogeneity on the hyporheic flow at a river section of the Xin’an River in Anhui Province, China. A 2D sand tank was constructed to simulate the natural streambed including a clay lens under different velocity of surface water velocity. Heat tracing was used in this study. In particular, six analytical sol

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Jing, Hai Wei, and An Gui Li. "Experimental Study of a Vertical Channel Solar Chimney with Uniform Heat Flux for Natural Ventilation in Buildings." Advanced Materials Research 374-377 (October 2011): 585–89. http://dx.doi.org/10.4028/www.scientific.net/amr.374-377.585.

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A experimentally study has been carried out to predict airflow rate, temperature field and velocity field for different chimney gap and heat flux. Results showed that, for veritical solar chimney,there is an optimum ratio of chimney width-to height to achieve a maximum airflow rate. The optimum ratio is about 1：2. Meanwhile,temperature and velocity field of solar chimney channel were analyzed. The air temperature and the velocity approaching to the surface of the heated wall are higher than that away from the surface of the heated wall.

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Benmouhoub, Dahbia, and Amina Mataoui. "Computation of heat transfer of a plane turbulent jet impinging a moving plate." Thermal Science 18, no. 4 (2014): 1259–71. http://dx.doi.org/10.2298/tsci111027101b.

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This study examines the performance of one point closure turbulence models in predicting of heat and momentum transfer of impinging flows. The scope of this paper is limited to impinging jet on a moving wall and heat transfer. The impinging distance is fixed to 8 thickness of the nozzle (8e) for this study. Two parameters are considered: the jet exit Reynolds number (10000?Re?25000) and the jet-surface velocity ratio (0?Rsj?4). the flow field structure at a given surface-to-jet velocity ratio is independent of the jet Reynolds number, a slight modification of the flow field is observed for low

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