Browsing by Subject "Computational fluid dynamics"

Now showing items 21-40 of 40

    • Article  

      A grid-free abstraction of the Navier-Stokes equations in Fortran 95/2003 

      Rouson, D. W. I.; Rosenberg, R.; Xu, X.; Moulitsas, I.; Kassinos, Stavros C. (2008)
      Computational complexity theory inspires a grid-free abstraction of the Navier-Stokes equations in Fortran 95/2003. A novel complexity analysis estimates that structured programming time grows at least quadratically with ...
    • Conference Object  

      Head posture influences the geometric and hemodynamic features on the healthy human carotid bifurcation 

      Aristokleous, Nicolas; Seimenis, Ioannis; Papaharilaou, Yannis; Khozeymeh, M. I.; Georgiou, Georgios C.; Brott, B. C.; Anayiotos, Andreas S. (2012)
      Atherosclerosis is the third leading cause of morbidity and mortality in the Western world. Low and oscillating wall shear stress (WSS) regions have been previously reported as parameters that correlate with the development ...
    • Article  

      Impact of head rotation on the individualized common carotid flow and carotid bifurcation hemodynamics 

      Aristokleous, Nicolas; Seimenis, Ioannis; Georgiou, Georgios C.; Papaharilaou, Yannis; Brott, B. C.; Nicolaïdes, Andrew N.; Anayiotos, Andreas S. (2014)
      This paper aims at evaluating the changes that head rotation poses on morphological and flow characteristics of the carotid bifurcation (CB) and on the distribution of parameters that are regarded as important in atherosclerosis ...
    • Doctoral Thesis  Open Access

      In silico studies for the prediction of regional aerosol deposition in the human airways 

      Koullapis, Pantelis G. (Πανεπιστήμιο Κύπρου, Πολυτεχνική Σχολή / University of Cyprus, Faculty of Engineering, 2018-10)
      Η πρόβλεψη των χαρακτηριστικών της σωματιδιακής εναπόθεσης στους αεραγωγούς του ανθρωπίνου πνεύμονα αποτελεί χρήσιμη πληροφορία στην ανάπτυξη εισπνεόμενων φαρμάκων αλλά και για την αξιολόγηση των επιπτώσεων στην ανθρώπινη ...
    • Article  

      Lagrangian particle dispersion in turbulent flow over a wall mounted obstacle 

      Grigoriadis, D. G. E.; Kassinos, Stavros C. (2009)
      Large-eddy simulations (LES) of particle-laden 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  

      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  

      Large-eddy simulation of wave turbulent boundary layer over rippled bed 

      Grigoriadis, D. G. E.; Dimas, A. A.; Balaras, E. (2012)
      Large-eddy 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  

      MHD flow past a circular cylinder using the immersed boundary method 

      Grigoriadis, D. G. E.; Sarris, I. E.; Kassinos, Stavros C. (2010)
      The immersed boundary method (IB hereafter) is an efficient numerical methodology for treating purely hydrodynamic flows in geometrically complicated flow-domains. Recently Grigoriadis et als. [1] proposed an extension of ...
    • Article  

      Numerical simulations of constant-influx gravity currents in confined spaces: Application to thermal storage tanks 

      Kaloudis, E.; Grigoriadis, D. G. E.; Papanicolaou, E. (2016)
      This study uses Computational Fluid Dynamics (CFD) to investigate numerically the flow phenomena in the intrusion region of a thermal storage water tank during discharge. The early times of the discharging process have ...
    • 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 ...
    • Article  

      On the transition to turbulence of a viscoplastic fluid past a confined cylinder: A numerical study 

      Kanaris, N.; Kassinos, Stavros C.; Alexandrou, Andreas N. (2015)
      Three-dimensional direct numerical simulations of a Bingham fluid flowing past a confined circular cylinder have been used in order to investigate viscoplastic effects in the wake-transition regime. The case of a cylinder ...
    • Article  

      Particle deposition in a realistic geometry of the human conducting airways: Effects of inlet velocity profile, inhalation flowrate and electrostatic charge 

      Koullapis, P. G.; Kassinos, Stavros C.; Bivolarova, M. P.; Melikov, A. K. (2016)
      Understanding the multitude of factors that control pulmonary deposition is important in assessing the therapeutic or toxic effects of inhaled particles. The use of increasingly sophisticated in silico models has improved ...
    • Conference Object  

      Rheological effects of strusture breakdown in semisolid slurries 

      Alexandrou, Andreas N.; Florides, G. C.; Georgiou, Georgios C.; Apelian, D. (2004)
      An essential element for the integration of the semisolid metal (SSM) process in the production of complex commercial components is the availability of accurate mathematical and computational tools that could describe both ...
    • Conference Object  

      Rheological effects of strusture breakdown in semisolid slurries 

      Alexandrou, Andreas N.; Florides, G. C.; Georgiou, G. C.; Apelian, D. (Affiliation: Department of Mechanical and Industrial Engineering, University Cyprus, P.O.Box 20537, 1678 Nicosia, CyprusAffiliation: Department of Mathematics and Statistics, University of Cyprus, P.O.Box 20537, 1678 Nicosia, CyprusAffiliation: Metal Processing Institute, WPI, Worcester, MA, United StatesCorrespondence Address: Alexandrou, A.N.Department of Mechanical and Industrial Engineering, University Cyprus, P.O.Box 20537, 1678 Nicosia, Cyprus, 2004)
      An essential element for the integration of the semisolid metal (SSM) process in the production of complex commercial components is the availability of accurate mathematical and computational tools that could describe both ...
    • Article  

      The steady annular extrusion of a Newtonian liquid under gravity and surface tension 

      Housiadas, Kostas D.; Georgiou, Georgios C.; Tsamopoulos, J. (2000)
      The steady extrusion of a Newtonian liquid through an annular die and its development outside and away from the die are studied under the influence of gravitational and surface tension forces. The finite element method ...
    • Article  

      Targeted Drug Delivery to Upper Airways Using a Pulsed Aerosol Bolus and Inhaled Volume Tracking Method 

      Ostrovski, Y.; Dorfman, S.; Mezhericher, M.; Kassinos, Stavros C.; Sznitman, J. (2018)
      The pulmonary route presents an attractive delivery pathway for topical treatment of lung diseases. While significant progress has been achieved in understanding the physical underpinnings of aerosol deposition in the ...
    • Conference Object  

      Three dimensional flow of thixotropic materials in a channel with a sudden expansion using a phenomenological constitutive relation 

      Alexandrou, Andreas N. (Affiliation: WPI, Worcester, United StatesCorrespondence Address: Alexandrou, Andreas N.WPI, Worcester, United States, 1996)
      A constitutive relation is proposed that is capable of predicting a wide range of experimental rheological behavior depending on the proper choice of the parameters. The model represents the otherwise discontinuous Bingham ...
    • Article  

      Time-dependent plane Poiseuille flow of a Johnson-Segalman fluid 

      Fyrillas, Marios M.; Georgiou, Georgios C.; Vlassopoulos, Dimitris (1999)
      We numerically solve the time-dependent planar Poiseuille flow of a Johnson-Segalman fluid with added Newtonian viscosity. We consider the case where the shear stress/shear rate curve exhibits a maximum and a minimum at ...
    • Conference Object  

      Transient flow characteristics and properties of semi-solid aluminum alloy A356 

      Tonmukayakul, N.; Pan, Q. Y.; Alexandrou, Andreas N.; Apelian, D. (Affiliation: Advance Casting Research Center, Metal Processing Institute, WPI, Worcester, MA 01609, United StatesAffiliation: Department of Mechanical and Industrial Engineering, University of Cyprus, P.O. Box 20537, 1678 Nicosia, CyprusCorrespondence Address: Tonmukayakul, N.Advance Casting Research Center, Metal Processing Institute, WPI, Worcester, MA 01609, United States, 2004)
      Development of numerical models to simulate flow characteristics of semi-solid metals in the die cavity requires a good understanding of the transient and equilibrium flow properties of semi-solids and knowledge of the ...