Browsing Τμήμα Μηχανικών Μηχανολογίας και Κατασκευαστικής / Department of Mechanical and Manufacturing Engineering by Author "Grigoriadis, Dimokratis G. E."
Now showing items 1-14 of 14
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Article
1D model for the energy yield calculation of natural convection solar air collectors
Demou, A. D.; Grigoriadis, Dimokratis 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, ...
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Conference Object
Buoyancy-driven flow inside an asymmetrically heated cavity
Demou, A. D.; Grigoriadis, Dimokratis G. E.; Geurts, B. J. (Springer International Publishing AG, 2019)Buoyancy-driven flows inside enclosures are in the center of problems related to heat transfer because they can provide a significant insight into the physical mechanisms of heat transfer. Typical examples of such flows ...
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Article
Direct numerical simulations of Rayleigh–Bénard convection in water with non-Oberbeck–Boussinesq effects
Demou, Andreas D.; Grigoriadis, Dimokratis G. E. (2019)Rayleigh–Bénard convection in water is studied by means of direct numerical simulations, taking into account the variation of properties. The simulations considered a three-dimensional (3-D) cavity with a square cross-section ...
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Article
Dynamic Friction Coefficient in Formulas of Bed-Load Transport Induced by Waves over Vortex Orbital Ripples
Kolokythas, Gerasimos A.; Grigoriadis, Dimokratis G. E.; Dimas, Athanassios A. (2018)
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Article
Effect of hydrodynamic forces on sandy sediments in oscillatory boundary layer flow
Fonias, Efstratios N.; Grigoriadis, Dimokratis G. E. (2019)In the present work, the forces exerted on spherical sand particles by oscillatory boundary layer flows at Re=25,000 and Re=55,000 are examined by means of Large Eddy Simulations. The particles move within the carrier fluid ...
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Article
An efficient method for two-fluid incompressible flows appropriate for the immersed boundary method
Frantzis, C.; Grigoriadis, Dimokratis G. E. (2019)The numerical simulation of two-fluid flows with sharp interfaces is a challenging field, not only because of their complicated physical mechanisms, but also because of increased computational cost. An efficient and robust ...
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Article
An efficient Navier-Stokes based numerical wave tank using fast Poisson solvers and the immersed boundary method
Frantzis, C.; Grigoriadis, Dimokratis G. E.; Dimas, A. A. (2020)An efficient numerical model for wave induced flows and their interaction with impermeable coastal structures, is presented. Using recent developments in the field of two-fluid (water/air) Navier-Stokes (NS) simulations, ...
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Conference Object
Efficient Pressure-Correction Method for Interfacial Tracking Appropriate for the Immersed Boundary Method
Frantzis, C.; Grigoriadis, Dimokratis G. E. (Springer International Publishing, 2019)Solving the Navier–Stokes equations to simulate incompressible two-fluid flows with interfaces, is still a developing scientific field. One of the main challenges, is the reduction of the computational cost which is still ...
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Conference Object
Large Eddy Simulation of Flow over Dunes Laden with Inertial Particles
Fonias, E. N.; Grigoriadis, Dimokratis G. E. (Springer International Publishing, 2018)Waves and currents are the basic mechanisms that set sediment in motion affecting the morphology of erodible beds in coastal flows.
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Article
Large Eddy Simulation of near-bed pipelines in oscillatory flow
Fonias, Efstratios N.; Grigoriadis, Dimokratis 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 ...
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Conference Object
Natural Convection in Ventilated Building Facades Using LES
Grigoriadis, Dimokratis G. E. (Springer International Publishing, 2018)Understanding the buoyancy-driven flow in gas gap enclosures can provide significant physical insight into a variety of technological applications ranging from cooling of electronic equipment to energy related components ...
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Article
A numerical methodology for efficient simulations of non-Oberbeck-Boussinesq flows
Demou, A. D.; Frantzis, C.; Grigoriadis, Dimokratis G. E. (2018)The Oberbeck-Boussinesq (OB) form of the Navier-Stokes equations can provide reliable solutions only for problems where the density differences are relatively small and all other material properties can be considered ...
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Article
Numerical simulations of turbulent flows within an infinite array of randomly placed cylinders
Ricardo, Ana M.; Grigoriadis, Dimokratis G. E.; Ferreira, Rui 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 ...
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Article
Variable property DNS of differentially heated cavities filled with air
Demou, Andreas D.; Grigoriadis, Dimokratis G. E. (2020)Direct numerical simulations (DNS) of the thermally-driven flow of air inside differentially heated cavities (DHC) are presented. The variation of air properties is taken into account using the low-Mach approximation, to ...