Browsing by Subject "Turbulent flow"
Now showing items 120 of 28

Article
An analytical solution for rapidly distorted turbulent shear flow in a rotating frame
(2006)In this study we apply rapid distortion theory to the case of nonstratified homogeneous turbulence that is sheared in a frame that counterrotates at a rate that matches in magnitude the rotation associated with the mean ...

Article
The ASBMSA turbulence closure: Taking advantage of structurebased modeling in current engineering CFD codes
(2015)Structurebased turbulence models (SBM) carry information about the turbulence structure that is needed for the prediction of complex nonequilibrium flows. SBM have been successfully used to predict a number of canonical ...

Article
Coherent structures in oscillating turbulent boundary layers over a fixed rippled bed
(2013)Coherent structures generated by oscillating turbulent boundary layers with or without a unidirectional current over a fixed, rippled bed are presented. The effect of ripple height and current intensity on the characteristics ...

Article
The contribution of active and inactive structures to the statistics of a turbulent pipe flow
(2017)The current study is a short followup to our most recent work (Stylianou et al., 2016), where among other things we have presented an effective criterion suitable for distinguishing largescale coherent structures with ...

Conference Object
Development of an efficient twophase 3D numerical wave flume
(Society of Petroleum Engineers, 2017)In the present study an efficient twophase 3D numerical wave flume was developed, tested and validated. The most important advantage over conventional numerical wave flumes is the use of a constant coefficient Poisson ...

Article
Direct numerical simulation of particle laden flow in a human airway bifurcation model
(2016)During the delivery of inhaled medicines, and depending on the size distribution of the particles in the formulation, airway bifurcations are areas of preferential deposition. Previous studies of laminar flow through airway ...

Conference Object
Effect of turbulent pulsating flow around a nearwall submerged cylinder on the potential motion of bed and suspended loads
(International Society of Offshore and Polar Engineers, 2016)In the present work, the pulsating flow around a submerged cylinder close to the impermeable seabed is examined by means of Large Eddy Simulations (LES). A Reynolds number equal to Re = 5000 is considered, based on the ...

Article
Efficient treatment of complex geometries for large eddy simulations of turbulent flows
(2004)Incompressible turbulent flow over a backward facing step at Reh=5100 is investigated by large eddy simulations (LES). The ratio of the oncoming boundary layer thickness δ to the step height h was set to 1.2. Additionally ...

Conference Object
Fully turbulent flow in a physiologically realistic human airway bifurcation
(TSFP9, 2015)Recent computational studies have shown that the airflow in the upper human airways is turbulent during much of the respiratory cycle. A feature of respiratory airflow that poses a challenge to computations based on ...

Article
A general framework for computing the turbulence structure tensors
(2015)Good measures of the turbulence structure are important for turbulence modeling, flow diagnostics and analysis. Structure information is complementary to the componentality anisotropy that the Reynolds stress tensor carries, ...

Article
Large Eddy Simulation of nearbed pipelines in oscillatory flow
(2018)A series of unsteady, threedimensional numerical simulations of the incompressible, oscillatory flow around a nearbed pipeline is presented. A flow at Reynolds number equal to Reαo=20,000 with respect to the oscillatory ...

Conference Object
Large eddy simulation of sediment transport for the pulsating flow past a cylinder over a horizontal bed
(International Society of Offshore and Polar Engineers, 2015)In the present work, the suspended, pulsating incompressible flow past a submerged cylinder was examined by means of Large Eddy Simulations (LES). A layer of sandy inertial particles was allowed to move between the cylinder ...

Article
Largeeddy simulation of wave turbulent boundary layer over rippled bed
(2012)Largeeddy simulation (LES) of turbulent boundary layer induced by external oscillatory flow without or with a unidirectional component over rippled bottom is presented. These flows represent prototype turbulent flows of ...

Article
Largeeddy simulations of the turbulent Hartmann flow close to the transitional regime
(2007)A series of largeeddy simulations (LES) of turbulent and transitional channel flows of a conductive fluid under the effect of a uniform magnetic field applied in the wallnormal direction, usually referred to as Hartmann ...

Article
LES of the flow past a rectangular cylinder using the immersed boundary concept
(2003)Incompressible turbulent flow past a long square cylinder is investigated using large eddy simulations LES). Results are presented and compared with available experimental databases for a Reynolds number Red = 22 000. The ...

Article
Linear analysis of generalized turbulent hyperbolic flow in a rotating frame
(2007)We apply inviscid rapid distortion theory to the generalized case of turbulent hyperbolic flow in a rotating frame and investigate the dependence of the evolution of the turbulent kinetic energy on the frame rotation rate. ...

Article
MHD flow past a circular cylinder using the immersed boundary method
(2010)The immersed boundary method (IB hereafter) is an efficient numerical methodology for treating purely hydrodynamic flows in geometrically complicated flowdomains. Recently Grigoriadis et als. [1] proposed an extension of ...

Conference Object
Numerical simulations of turbulent flow in an eccentric annulus of unit eccentricity
(TSFP9, 2015)In this study, we perform Direct Numerical Simulations (DNS) of fully developed turbulent flows in eccentric annuli having different diameter ratios. Annuli of unit eccentricity, and diameter ratios of 0.2591 and 0.1395 ...

Article
On the linear stability of turbulent plane strain flow in a rotating frame
(2007)We apply inviscid rapid distortion theory to the limiting hyperbolic case of turbulent plain strain flow in a rotating frame and investigate the dependence of the evolution of the turbulent kinetic energy on the frame ...

Article
Rapid shear of initially anisotropic turbulence in a rotating frame?
(2007)In the present study, we investigate, using inviscid rapid distortion theory, the evolution of sheared turbulence in a rotating frame as a function of the rotation rate (including stable, transitional, and unstable regimes), ...