Results 11 to 20 of about 6,328 (265)

On the Conservation of Turbulence Energy in Turbulence Transport Models

The Astrophysical Journal, 2022
Abstract Zank et al. developed models describing the transport of low-frequency incompressible and nearly incompressible turbulence in inhomogeneous flows. The formalism was based on expressing the fluctuating variables in terms of the Elsässar variables and then taking “moments” subject to various closure hypotheses.
B.-B. Wang, G. P. Zank, L. Adhikari, L.-L. Zhao   +3 more
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On the modeling of the transport of particles in turbulent flows [PDF]

ESAIM: Mathematical Modelling and Numerical Analysis, 2004
Summary: We investigate different asymptotic regimes for Vlasov equations modeling the evolution of a cloud of particles in a turbulent flow. In one case we obtain a convection or a convection-diffusion effective equation for the concentration of particles. In the second case, the effective model relies on a Vlasov-Fokker-Planck equation.
Goudon, Thierry, Poupaud, Frédéric
openaire   +3 more sources

Spectral transport model for turbulence

Theoretical and Computational Fluid Dynamics, 1990
The spectrum of inhomogeneous turbulence is modeled by an approach that is not limited to regimes of large Reynolds numbers or small mean-flow strain rates. In its simplest form and applied to incompressible flow, the model depends on five phenomenological constants defining the strength of the turbulence coupling to mean flow, turbulence transport in ...
D Besnard, F Harlow, R Rauenzahn, C Zemach   +3 more
openaire   +4 more sources

Mechanisms of Inertial Particle Transport in Compressible Wall Turbulence: The Role of Compressibility-modified Coherent Structures [PDF]

Journal of Applied Fluid Mechanics
Particle-laden compressible turbulence plays a key role in industrial and aerospace applications. This study investigates the near-wall transport behavior of inertial particles in compressible channel turbulence using direct numerical simulation (DNS ...
T. Li, W. Zhang, Y. Deng, M. Qin
doaj   +1 more source

Impact of Enhanced Wave-Induced Mixing on the Ocean Upper Mixed Layer during Typhoon Nepartak in a Regional Model of the Northwest Pacific Ocean

Remote Sensing, 2020
To investigate the effect of wave-induced mixing on the upper ocean structure, especially under typhoon conditions, an ocean-wave coupled model is used in this study. Two physical processes, wave-induced turbulence mixing and wave transport flux residue,
Chengcheng Yu, Yongzeng Yang, Xunqiang Yin, Meng Sun, Yongfang Shi   +4 more
doaj   +1 more source

Turbulent transport, emissions and the role of compensating errors in chemical transport models [PDF]

Geoscientific Model Development, 2013
Abstract. The balance between turbulent transport and emissions is a key issue in understanding the formation of O3 and particulate matter with diameters less than 2.5 μm (PM2.5). Discrepancies between observed and simulated concentrations for these species have, in the past, been ascribed to insufficient turbulent mixing, particularly for ...
P. A. Makar, R. Nissen, A. Teakles, J. Zhang, Q. Zheng, M. D. Moran, H. Yau, C. diCenzo   +7 more
openaire   +3 more sources

High-Order Accurate Numerical Simulation of Supersonic Flow Using RANS and LES Guided by Turbulence Anisotropy

Fluids, 2022
This paper discusses accuracy improvements to Reynolds-Averaged Navier–Stokes (RANS) modeling of supersonic flow by assessing a wide range of factors for physics capture.
Kalyani Bhide, Shaaban Abdallah
doaj   +1 more source

Turbulence structure and near-wall suppression in equilibrium and nonequilibrium sediment transport: An experimental study

International Journal of Sediment Research
Sediment transport in open channels plays a significant role in shaping turbulent flow structures, influencing sediment dynamics and flow resistance. Transport regimes are classified into equilibrium, where sediment inflow and outflow are balanced, and ...
Bambang Agus Kironoto, Miskar Maini, Adam Pamudji Rahardjo, Istiarto   +3 more
doaj   +1 more source

Simulating Real Atmospheric Boundary Layers at Gray-Zone Resolutions: How Do Currently Available Turbulence Parameterizations Perform?

Atmosphere, 2020
Recent computational and modeling advances have led a diverse modeling community to experiment with atmospheric boundary layer (ABL) simulations at subkilometer horizontal scales. Accurately parameterizing turbulence at these scales is a complex problem.
Paula Doubrawa, Domingo Muñoz-Esparza
doaj   +1 more source

Transport-based model for turbulence-corrupted imagery

Applied Optics, 2018
A new model for turbulence-corrupted imagery is proposed based on the theory of optimal mass transport. By describing the relationship between photon density and the phase of the traveling wave, and combining it with a least action principle, the model suggests a new class of methods for approximately recovering the solution of the photon density flow ...
J M, Nichols, T H, Emerson, L, Cattell, S, Park, A, Kanaev, F, Bucholtz, A, Watnik, T, Doster, G K, Rohde   +8 more
openaire   +2 more sources