Results 1 to 10 of about 5,872 (264)

Microstructure profiler to study mixing and turbulent transport processes

IEEE Oceanic Engineering Society. OCEANS'98. Conference Proceedings (Cat. No.98CH36259), 2002
The MST (Microstructure-Turbulence) Profiler is a newly developed operational microstructure measuring system for marine turbulence measurements. The profiler can be used for sinking and uprising measurements and is equipped with a new type of current shear sensor. The authors have tested the MST Profiler in several field measuring campaigns.
H. Prandke, A. Stips
openaire   +1 more source

Turbulent mixing and passive scalar transport in shallow flows

Physics of Fluids, 2011
A depth-integrated model including subgrid scale mixing effects for turbulent transport by long waves and currents is presented. A fully nonlinear, depth-integrated set of equations for weakly dispersive and rotational flow is derived by the long wave perturbation approach.
Dae-Hong Kim, Patrick J. Lynett
openaire   +1 more source

A modification of the mixing length approach to turbulent transport

Journal of Applied Physics, 1986
It is known that the usual development of the mixing length approach to the transport of a passive physical quantity in a turbulent fluid is only valid if the proportional change in concentration of the quantity over a mixing length l is small. In the present paper we formulate a modification of the theory which is not subject to this constraint and ...
openaire   +1 more source

On the relationship between mixing length and strong turbulence estimates for transport due to drift turbulence

Plasma Physics and Controlled Fusion, 2001
For a simple two-dimensional nonlinear model of the collisional drift instability the relationship between mixing length and strong turbulence fluxes investigated. Calculation of the turbulent wavenumber spectrum within a strong turbulence model shows that the transport is dominated by an inertial range contribution; this yields a similar result for ...
J W Connor, O P Pogutse
openaire   +1 more source

Energy transport due to turbulent mixing in the atmosphere

Journal of Atmospheric and Terrestrial Physics, 1961
Abstract An order-of-magnitude analysis of energy transport in a horizontally convecting turbulent atmosphere indicates that three fluxes can contribute importantly to vertical energy transfer: a heat flux due to turbulent mixing of the compressible fluid through the vertical temperature and pressure gradients; a flux of total energy produced by ...
openaire   +1 more source

Forward and Backward Stochastic Lagrangian Models for turbulent transport and the well-mixed condition

Monte Carlo Methods and Applications, 2001
Summary: We suggest Lagrangian stochastic models and algorithms for simulating the transport of particles in turbulent flows. Stochastic algorithms for calculating the concentration of a scalar and its flux at a fixed point released from a source arbitrarily situated in the space are constructed.
Karl Sabelfeld, Irina A. Shalimova
openaire   +2 more sources

A Linear- Eddy Model of Turbulent Scalar Transport and Mixing

Combustion Science and Technology, 1988
Abstract Transport and mixing of diffusive scalars in turbulent flows are simulated computationally based on a novel representation of the temporal evolution along a transverse line moving with the mean fluid velocity. The scalar field along this line evolves by Fickian diffusion, representing molecular processes, and by randomly occurring events ...
openaire   +1 more source

Scalar Transport Near the Turbulent/Non-Turbulent Interface in Reacting Compressible Mixing Layers

2020
Direct numerical simulations of temporally evolving compressible reacting mixing layers with Schmidt number equal to one are performed to examine the transport of a conserved scalar across the turbulent/non-turbulent interface (TNTI). The budgets of the scalar-gradient transport equation are used to study the effects of compressibility and heat release
Reza Jahanbakhshi, Cyrus K. Madnia
openaire   +1 more source

Turbulent transport in mixed states of convective cells and sheared flows

Physics of Plasmas, 1996
Low-order mode coupling equations are used to describe recent computer simulations of resistive-g turbulent convection that show bifurcations for the onset of steady and pulsating sheared mass flows. The three convective transport states are identified with the tokamak confinement regimes called low-mode (L-mode), high-mode (H-mode), and edge-localized
W. Horton, G. Hu, G. Laval
openaire   +1 more source

Mixing processes and buoyancy transport in stratified turbulent flows

2020
This thesis attempts to increase the overall understanding of turbulent mixing by exploring the controls on the vertical buoyancy transport in a stratified turbulent Taylor-Couette flow. The inner cylinder of the tank, of radius R1, rotates, while the outer cylinder, of radius R2, is fixed, and the gap \Delta R=R2-R1 is filled with fluid up to a depth ...
openaire   +2 more sources