Browsing by Subject "LES"

Article

Coherent structures in oscillating turbulent boundary layers over a fixed rippled bed

Grigoriadis, D. G. E.; Balaras, E.; Dimas, A. A. (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 ...

Conference Object

Effect of turbulent pulsating flow around a near-wall submerged cylinder on the potential motion of bed and suspended loads

Fonias, E. N.; Grigoriadis, D. G. E. (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

Grigoriadis, D. G. E.; Bartzis, J. G.; Goulas, A. (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 ...

Article

Large Eddy Simulation of near-bed pipelines in oscillatory flow

Fonias, E. N.; Grigoriadis, D. G. E. (2018)

A series of unsteady, three-dimensional numerical simulations of the incompressible, oscillatory flow around a near-bed 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

Fonias, E. N.; Grigoriadis, D. G. E. (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

LES of the flow past a rectangular cylinder using the immersed boundary concept

Grigoriadis, D. G. E.; Bartzis, J. G.; Goulas, A. (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

Numerical simulations of turbulent flows within an infinite array of randomly placed cylinders

Ricardo, A. M.; Grigoriadis, D. G. E.; Ferreira, R. M. L. (2018)

We address the task of modelling numerically turbulent flows within random arrays of circular cylinders, relevant for several industrial and environmental applications. Numerical simulations are employed to model infinite ...