Browsing by Author "Georgiou, Georgios C."
Now showing items 2140 of 161

Article
Comparison of spectral and finite element methods applied to the study of the coreannular flow in an undulating tube
Kouris, C.; Dimakopoulos, Yannis; Georgiou, Georgios C.; Tsamopoulos, J. (2002)A Galerkin/finite element and a pseudospectral method, in conjunction with the primitive (velocitypressure) and streamfunctionvorticity formulations, are tested for solving the twophase flow in a tube, which has a ...

Article
Comparison of two methods for the computation of singular solutions in elliptic problems
Georgiou, Georgios C.; Boudouvis, Andreas G.; Poullikkas, A. (1997)We compare two numerical methods for the solution of elliptic problems with boundary singularities. The first is the integrated singular basis function method (ISBFM), a finiteelement method in which the solution is ...

Article
Complex systems modelling, analysis, and control
Siettos, C. I.; De Decker, Y.; Georgiou, Georgios C. (2013)

Article
The compressible Newtonian extrudate swell problem
Georgiou, Georgios C. (1995)We solve the compressible Newtonian extrudate swell problem in order to investigate the effect of compressiblity on the shape of the extrudate. We employ a first‐order equation of state relating the density to the pressure ...

Article
Compressible viscous flow in slits with slip at the wall
Georgiou, Georgios C.; Crochet, M. J. (1994)We study the timedependent compressible flow of a Newtonian fluid in slits using an arbitrary nonlinear slip law relating the shear stress to the velocity at the wall. This slip law exhibits a maximum and a minimum and ...

Article
Continuum model for the phase behavior, microstructure, and rheology of unentangled polymer nanocomposite melts
Stephanou, Pavlos S.; Mavrantzas, V. G.; Georgiou, Georgios C. (2014)We introduce a continuum model for polymer melts filled with nanoparticles capable of describing in a unified and selfconsistent way their microstructure, phase behavior, and rheology in both the linear and nonlinear ...

Article
Converged solutions of the Newtonian extrudateswell problem
Georgiou, Georgios C.; Boudouvis, Andreas G. (1999)Both the axisymmetric and the planar Newtonian extrudateswell problems are solved using the standard and the singular finite element methods. In the latter method, special elements that incorporate the radial form of the ...

Article
The Cyprus Coastal Ocean Forecasting and Observing System
Zodiatis, George; Lardner, R.; Georgiou, Georgios C.; Demirov, E.; Pinardi, N.; Manzella, G. (2003)The countries surrounding the Mediterranean Sea have joined together in several multinational initiatives to conduct longterm, integrated, operational oceanographic observations and modelling of this important region. A ...

Article
Cyprus coastal ocean forecasting and observing system
Zodiatis, George; Lardner, R.; Georgiou, Georgios C.; Demirov, E.; Pinardi, N. (2003)A complete operational oceanographic forecasting and observing system has been developed in Cyprus, covering the coastal and open deep sea areas around Cyprus and the Levantine Basin, and has been operational since early ...

Conference Object
Design of a prototype tsunami warning and early response system for Cyprus  TWERC
Georgiou, Georgios C.; Clark, A. M.; Zodiatis, George; Hayes, D.; Glekas, D. (2010)Described is the expansion of an existing and operational ocean observatory known as CYCOFOS (Cyprus Coastal Ocean Forecasting and Observing System), with a network of tsunami detection sensors. The expanded network will ...

Article
Determination of the rheological parameters of selfcompacting concrete matrix using slump flow test
Neophytou, Marina K. A.; Pourgouri, Stella; Kanellopoulos, Antonios D.; Petrou, Michael F.; Ioannou, Ioannis; Georgiou, Georgios C.; Alexandrou, Andreas N. (2010)The classification of a concrete mixture as selfcompacting (SCC) is performed by a series of empirical characterization tests that have been designed to assess not only the flowability of the mixture but also its segregation ...

Article
Determining true material constants of semisolid slurries from rotational rheometer data
Alexandrou, Andreas N.; Georgiou, Georgios C.; Economides, Eva Athena; Modigell, M. (2016)In this work we revisit the issue of obtaining true material constants for semisolid slurries. Therefore, we consider the circular Couette flow of HerschelBulkley fluids. We first show how true constants can be obtained ...

Article
Determining true material constants of viscoplastic materials from rotational rheometer data
Alexandrou, Andreas N.; Georgiou, Georgios C.; Economides, EvaAthena; Zang, Christoph; Modigell, Michael (2018)We analyse the circular Couette flow of Herschel–Bulkley fluids to investigate the validity of the assumption that the rate of strain distributions across the gap share a common point. It is demonstrated that this is true ...

Article
Development lengths in Newtonian Poiseuille flows with wall slip
Kountouriotis, Zacharias; Philippou, Maria; Georgiou, Georgios C. (2016)The effect of wall slip on the development of planar and axisymmetric Newtonian Poiseuille flows is studied by means of finite element simulations. The Navier slip law is employed. i.e., it is assumed that the slip velocity ...

Conference Object
Development of confined viscoplastic flows with heterogeneous wall slip
Panaseti, Pandelitsa; Philippou, Maria; Kountouriotis, Zacharias; Georgiou, Georgios C. (National Technical University of Athens, 2016)The steady, pressuredriven flow of a HerschelBulkley fluid in a channel is considered assuming that slip occurs on one wall only due to slip heterogeneities. Hence, the velocity profile is allowed to be asymmetric. The ...

Conference Object
Effect of head posture changes in the geometry and hemodynamics of a healthy human carotid bifurcation
Papaharilaou, Yannis; Seimenis, Ioannis; Pattakos, N.; Ekaterinaris, J.; Georgiou, Georgios C.; Eracleous, Eleni A.; Christou, Chris; Brott, B. C.; Anayiotos, Andreas S. (2007)

Article
Effect of head posture on the healthy human carotid bifurcation hemodynamics
Papaharilaou, Yannis; Aristokleous, Nicolas; Seimenis, Ioannis; Khozeymeh, M. I.; Georgiou, Georgios C.; Brott, B. C.; Eracleous, Eleni A.; Anayiotos, Andreas S. (2013)Head and neck postures may cause morphology changes to the geometry of the carotid bifurcation (CB) that alter the low and oscillating wall shear stress (WSS) regions previously reported as important in the development of ...

Conference Object
Effect of head rotation at the prone position on the geometric features of the healthy carotid bifurcation
Aristokleous, Nicolas; Seimenis, Ioannis; Papaharilaou, Yannis; Georgiou, Georgios C.; Brott, B. C.; Anayiotos, Andreas S. (2010)

Article
The Effect of Head Rotation on the Geometry and Hemodynamics of Healthy Vertebral Arteries
Aristokleous, Nicolas; Seimenis, Ioannis; Georgiou, Georgios C.; Nicolaïdes, Andrew N.; Anayiotos, Andreas S. (2015)The geometric and hemodynamic characteristics of the left and right vertebral arteries (LVA, RVA) of six healthy volunteers were investigated for the supine (S) and the prone position (P) a common sleeping posture with ...

Conference Object
Effect of posture change on the geometric features of the healthy carotid bifurcation
Aristokleous, Nicolas; Seimenis, Ioannis; Papaharilaou, Yannis; Georgiou, Georgios C.; Brott, B. C.; Anayiotos, Andreas S. (2009)Segmented cross sectional MRI images were used to construct 3D virtual models of the carotid bifurcation in 5 healthy volunteers. Geometric features such as bifurcation angle, planarity angle, asymmetry angle tortuosity ...