Results 21 to 30 of about 19,278,057 (340)

Droplets. I. Pressure-dominated Coherent Structures in L1688 and B18 [PDF]

Astrophysical Journal, 2018
We present the observation and analysis of newly discovered coherent structures in the L1688 region of Ophiuchus and the B18 region of Taurus. Using data from the Green Bank Ammonia Survey, we identify regions of high density and near-constant, almost ...
H. Chen, J. Pineda, A. Goodman, A. Burkert, S. Offner, R. Friesen, P. Myers, F. Alves, H. Arce, P. Caselli, A. Chacón-Tanarro, M. Chen, J. di Francesco, A. Ginsburg, J. Keown, H. Kirk, P. Martin, C. Matzner, A. Punanova, E. Redaelli, E. Rosolowsky, S. Scibelli, Y. Seo, Y. Shirley, Ayushi Singh   +24 more
semanticscholar   +1 more source

On Rayleigh-Taylor and Richtmyer-Meshkov Dynamics With Inverse-Quadratic Power-Law Acceleration

Frontiers in Applied Mathematics and Statistics, 2022
Rayleigh-Taylor (RT) and Richtmyer-Meshkov (RM) instabilities occur in many situations in Nature and technology from astrophysical to atomic scales, including stellar evolution, oceanic flows, plasma fusion, and scramjets.
D. L. Hill, S. I. Abarzhi
doaj   +1 more source

Educing coherent eddy structures in air curtain systems [PDF]

, 2008
The work reported here comes within a broader research program dealing with ambiance separation or confining by means of air curtains (plane air jets). The process is studied experimentally by Particle Image Velocimetry (PIV).
Pavageau, Michel, Loubière, Karine
core   +1 more source

Evaluation of Actuator Disk Model Relative to Actuator Surface Model for Predicting Utility-Scale Wind Turbine Wakes

Energies, 2020
The Actuator Disk (AD) model is widely used in Large-Eddy Simulations (LES) to simulate wind turbine wakes because of its computing efficiency. The capability of the AD model in predicting time-average quantities of wind tunnel-scale turbines has been ...
Zhaobin Li, Xiaolei Yang
doaj   +1 more source

Characterization of coherent structures in dissipative systems using nonlinear Fourier transform [PDF]

, 2020
We demonstrated how the nonlinear Fourier transform based on the Zakharov-Shabat spectral problem can be used to characterise coherent structures in dissipative systems.
Shtyrina, O. V., Chekhovskoy, I. S., Fedoruk, M. P., Turitsyn, S. K., Medvedev, S. B.   +4 more
core   +1 more source

Studying geometric structures in meso-scale flows

Frontiers in Environmental Science, 2014
Geometric shapes of coherent structures such as ramp or cliff like signals, step changes and waves, are commonly observed in meteorological temporal series and dominate the turbulent energy and mass exchange between the atmospheric surface layer and the ...
Christos H. Halios, Costas G. Helmis, Dimosthenis N. Asimakopoulos   +2 more
doaj   +1 more source

Coherent Structures at Ion Scales in Fast Solar Wind: Cluster Observations [PDF]

, 2017
We investigate the nature of magnetic turbulent fluctuations, around ion characteristic scales, in a fast solar wind stream, by using Cluster data.
D. Perrone, O. Alexandrova, O. Roberts, S. Lion, C. Lacombe, A. Walsh, M. Maksimović, I. Zouganelis   +7 more
semanticscholar   +1 more source

On coherent vortical structures in wave breaking

Journal of Fluid Mechanics, 2022
The flow generated by the breaking of free-surface waves in a periodic domain is simulated numerically with a gas–liquid Navier–Stokes solver. The solver relies on the volume-of-fluid method to account for different phases, and the interface tracking is ...
Simone Di Giorgio, S. Pirozzoli, A. Iafrati   +2 more
semanticscholar   +1 more source

A Study on Flux Contributions of Turbulent Coherent Structures over Forest Underlying Surfaces Using the CEEMD Method [PDF]

Gaoyuan qixiang
In order to study the turbulent coherent structure characteristics under the complex underlying surface of forests， three-layer turbulence data set up at 1.33 times， 2.53 times， and 3.86 times canopy degrees in the artificial forest area of Mount Si E in
Yanqi WANG, Yu ZHANG, Youqi SU, Qian ZHANG, min YE
doaj   +1 more source

Accuracy of the Cell-Set Model on a Single Vane-Type Vortex Generator in Negligible Streamwise Pressure Gradient Flow with RANS and LES

Journal of Marine Science and Engineering, 2020
Passive flow control devices are included in the design of wind turbine blades in order to obtain better performance and reduce loads without consuming any external energy.
Iosu Ibarra-Udaeta, Koldo Portal-Porras, Alejandro Ballesteros-Coll, Unai Fernandez-Gamiz, Javier Sancho   +4 more
doaj   +1 more source