Turbulence and the Dynamics of Coherent Structures

Evaluation of Turbulence on the Dynamics of Monopile Offshore Wind Turbine under the Wave and Wind Excitations

In recent years, the use of offshore wind turbines has been considered on the agenda of the countries which have a significant maritime boundary due to more speed and stability of wind at sea. The aim of this study is to investigate the effect of wind turbulence on the aero-hydrodynamic behavior of offshore wind turbines with a monopile platform. Since in the sea, the wind turbine structures ar...

Turbulence and the Dynamics of Coherent Structures Part Ii: Symmetries and Transformations*

Coherent structures in dissipative particle dynamics simulations of the transition to turbulence in compressible shear flows.

We present simulations of coherent structures in compressible flows near the transition to turbulence using the dissipative particle dynamics method. The structures we find are remarkably consistent with experimental observations and direct numerical simulations (DNS) simulations of incompressible flows, despite a difference in Mach number of several orders of magnitude. The bifurcation from th...

Investigation of Coherent and Incoherent Laser Beams Propagation Through Turbulent Atmosphere

In this paper propagation of combined laser beam through atmosphere is investigated. Laser beam is combined via lens array arrangement. Turbulence is considered as an affecting factor of atmosphere and its effects on transverse coherence length (Fried parameter), peak intensity, propagation efficiency, and spot size of the laser beam is investigated. Coherent and incoherent combined beam are co...

A low-dimensional model predicting geometry-dependent dynamics of large-scale coherent structures in turbulence

We test the ability of a general low-dimensional model for turbulence to predict geometrydependent dynamics of large-scale coherent structures, such as convection rolls. The model consists of stochastic ordinary differential equations, which are derived as a function of boundary geometry from the Navier-Stokes equations [1, 2]. We test the model using Rayleigh-Bénard convection experiments in a...