Browsing by Author "Grigoriadis, D. G. E."
Now showing items 120 of 33

Article
1D model for the energy yield calculation of natural convection solar air collectors
Demou, A. D.; Grigoriadis, D. G. E. (2018)A one dimensional model has been developed and presented to calculate the seasonal energy yield of solar air collectors. This model takes into account local meteorological conditions, the effects of geometrical configuration, ...

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 ...

Article
Computation of complex terrain turbulent flows using hybrid algebraic structurebased models (ASBM) and LES
Panagiotou, C.; Kassinos, Stavros C.; Grigoriadis, D. G. E. (2016)In this work, we revisit the coupling of the Algebraic StructureBased Model with popular twoequation eddy viscosity models (EVM). We consider both the v2 − f model and variants of the κω model. Our aim is to explore the ...

Article
Developing and investigating a pure MonteCarlo module for transient neutron transport analysis
Mylonakis, A. G.; Varvayanni, M.; Grigoriadis, D. G. E.; Catsaros, N. (2017)In the field of computational reactor physics, MonteCarlo methodology is extensively used in the analysis of static problems while the transient behavior of the reactor core is mostly analyzed using deterministic algorithms. ...

Conference Object
Development of an efficient twophase 3D numerical wave flume
Frantzis, C.; Grigoriadis, D. G. E. (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
Diagnostic properties of structure tensors in turbulent flows
Grigoriadis, D. G. E.; Langer, C. A.; Kassinos, Stavros C. (2010)The behavior of turbulence structure tensors based on LargeEddy Simulations (LES) in a wide range of turbulent channel flows is presented. The structure tensors provide significant physical information on the character ...

Article
Direct and largeeddy simulation X
Grigoriadis, D. G. E.; Geurts, B. J.; Kuerten, H.; Fröhlich, J.; Armenio, V. (2018)

Article
Direct numerical simulation of turbulent liquid metal flow entering a magnetic field
AlbetsChico, X.; Grigoriadis, D. G. E.; Votyakov, E. V.; Kassinos, Stavros C. (2013)This paper presents direct numerical simulations (DNS) of fully developed turbulent liquidmetal flow in a circular duct entering a magnetic field. The case of a magnetohydrodynamic flow leaving a strong magnetic field has ...

Conference Object
Effect of turbulent pulsating flow around a nearwall 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
Effects of rotation on the oscillatory flow over ripples
Grigoriadis, D. G. E.; Armenio, V. (2015)Largeeddy simulations (LES) of oscillating turbulent boundary layers, over a rippled bed, subjected to frame rotation are presented. This flowis archetypal of a bottomocean, tidally driven boundary layer developing over ...

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
Immersed boundary method for the MHD flows of liquid metals
Grigoriadis, D. G. E.; Kassinos, Stavros C.; Votyakov, E. V. (2009)Wallbounded magnetohydrodynamic (MHD hereafter) flows are of great theoretical and practical interest. Even for laminar cases, MHD simulations are associated with very high computational cost due to the resolution ...

Article
Lagrangian particle dispersion in turbulent flow over a wall mounted obstacle
Grigoriadis, D. G. E.; Kassinos, Stavros C. (2009)Largeeddy simulations (LES) of particleladen turbulent flows are presented in order to investigate the effects of particle response time on the dispersion patterns of a space developing flow with an obstruction, where ...

Article
Laminar free convection in a square enclosure driven by the Lorentz force
Sarris, I. E.; Grigoriadis, D. G. E.; Vlachos, N. S. (2010)A numerical study is presented of laminar free convection flow driven by magnetic forces. An external magnetic field with one spatially varying component is applied to an electrically conducting fluid in a square enclosure. ...

Article
Large eddy simulation of flow over dunes laden with inertial particles
Fonias, E. N.; Grigoriadis, D. G. E. (2018)Waves and currents are the basic mechanisms that set sediment in motion affecting the morphology of erodible beds in coastal flows. © 2018, Springer International Publishing AG.

Article
Large Eddy Simulation of nearbed pipelines in oscillatory flow
Fonias, E. N.; Grigoriadis, D. G. E. (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
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
Large eddy simulation of thermocline flow phenomena and mixing during discharging of an initially homogeneous or stratified storage tank
Kaloudis, E.; Grigoriadis, D. G. E.; Papanicolaou, E.; Panidis, T. (2014)This study investigates numerically the flow phenomena developing in the discharging process of a rectangular water tank used for thermal energy storage and how these affect the thermal mixing and the associated energy ...

Article
Large eddy simulations of turbulent mixed convection in the charging of a rectangular thermal storage tank
Kaloudis, E.; Grigoriadis, D. G. E.; Papanicolaou, E.; Panidis, T. (2013)The Large Eddy Simulation (LES) approach is used to investigate numerically the mixed convection problem arising during the charging process of a rectangular water tank used for thermal energy storage. Two different charging ...

Article
Largeeddy simulation of wave turbulent boundary layer over rippled bed
Grigoriadis, D. G. E.; Dimas, A. A.; Balaras, E. (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 ...