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Browsing by Subject "Shear flow"

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    • Article  

      An analytical solution for rapidly distorted turbulent shear flow in a rotating frame 

      Akylas, Evaggelos; Kassinos, Stavros C.; Langer, A. C. (2006)
      In this study we apply rapid distortion theory to the case of nonstratified homogeneous turbulence that is sheared in a frame that counter-rotates at a rate that matches in magnitude the rotation associated with the mean ...

    • Article  

      Cessation of Newtonian circular and plane Couette flows with wall slip and non-zero slip yield stress 

      Philippou, Maria; Damianou, Y.; Miscouridou, X.; Georgiou, Georgios C. (2017)
      We solve analytically the cessation flows of a Newtonian fluid in circular and plane Couette geometries assuming that wall slip occurs provided that the wall shear stress exceeds a critical threshold, the slip yield stress. ...

    • Conference Object  

      Computational fluid dynamics (CFD) Simulations of aerosol deposition in the lungs 

      Koullapis, P. G.; Kassinos, Stavros C.; Lin, C.-L. (TSFP-9, 2015)
      In the current study, Large Eddy Simulations (LES) are used to investigate the transport and deposition of inhaled aerosol particles (dp = 0.1, 0.5, 1, 2.5, 5, 10 μm) in a realistic geometry of the human airways under ...

    • 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 ...

    • Article  

      Dynamic responses in nanocomposite hydrogels 

      Loizou, Elena; Butler, P.; Porcar, L.; Schmidt, G. (2006)
      The shear response of a series of polymer-clay gels has been investigated by means of rheology and small-angle neutron scattering (SANS). The gels have the same composition by mass but different polymer molecular weights ...

    • Conference Object  

      The effect of flow rate, head position, and inhaler orientation on the airflow and particle deposition in an mri-based mouth-throat geometry 

      Stylianou, F. S.; Angeli, S.; Kassinos, Stavros C.; Svensson, M. (International Symposium on Turbulence and Shear Flow Phenomena, TSFP10, 2017)
      The mouth-throat plays a key role in the administration of inhaled medicines. It is an area of intense filtration, where an unacceptably high fraction of the released drug dose is deposited and thus wasted. Due to the ...

    • 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 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  

      Effect of yield penetration on column plastic hinge length 

      Megalooikonomou, K. G.; Tastani, S. P.; Pantazopoulou, Stavroula J. (2018)
      The required confined zone in critical regions of columns and piers undergoing lateral sway during earthquakes is related to the plastic hinge length where inelastic deformation and damage develops. The exact definition ...

    • Article  

      Full magnetohydrodynamic solution of liquid-metal flow in an insulating pipe subjected to a strong fringing magnetic field 

      Albets-Chico, X.; Radhakrishnan, H.; Kassinos, Stavros C. (2012)
      This paper addresses liquid-metal flow under a strong, fringing, decreasing magnetic field in an insulating circular pipe by a full resolution of the magnetohydrodynamic (MHD) equations. The aims of the paper are first to ...

    • Conference Object  

      Fully turbulent flow in a physiologically realistic human airway bifurcation 

      Stylianou, F. S.; Kassinos, Stavros C. (TSFP-9, 2015)
      Recent computational studies have shown that the airflow in the upper human airways is turbulent during much of the respiratory cycle. A feature of respiratory airflow that poses a challenge to computations based on ...

    • Article  

      The Influence of Crack-Face Normal and Shear Stress Loading on Hydraulic Fracture-Tip Singular Plastic Fields 

      Papanastasiou, Panos C.; Durban, D. (2018)
      We investigated the singular plastic fields at the crack tip of a fracture that is loaded with normal and shear loads due to a viscous flow in a hydraulic fracturing. The level of the expected shear load in comparison with ...

    • Article  

      Linear stability diagrams for the shear flow of an Oldroyd-B fluid with slip along the fixed wall 

      Fyrillas, Marios M.; Georgiou, Georgios C. (1998)
      We consider the time-dependent shear flow of an Oldroyd-B fluid with slip along the fixed wall. Slip is allowed by means of a generic slip equation predicting that the shear stress is a non-monotonic function of the velocity ...

    • Article  

      A note on the unbounded creeping flow past a sphere for Newtonian fluids with pressure-dependent viscosity 

      Housiadas, Kostas D.; Georgiou, Georgios C.; Tanner, R. I. (2015)
      We investigate theoretically isothermal, incompressible, creeping Newtonian flows past a sphere, under the assumption that the shear viscosity is pressure-dependent, varying either linearly or exponentially with pressure. ...

    • Conference Object  

      Numerical simulation of injection mold filling for semi-solid materials 

      Ahmed, Alauddin; Alexandrou, Andreas N. (ASME, 1995)
      Processing of metals and metal matrix composites in the semi-solid state is an emerging new technology and is becoming increasingly popular. This method provides several advantages over the traditional liquid state processing ...

    • Conference Object  

      Numerical simulations of turbulent flow in an eccentric annulus of unit eccentricity 

      Kanaris, N.; Albets-Chico, X.; Kassinos, Stavros C. (TSFP-9, 2015)
      In this study, we perform Direct Numerical Simulations (DNS) of fully developed turbulent flows in eccentric annuli having different diameter ratios. Annuli of unit eccentricity, and diameter ratios of 0.2591 and 0.1395 ...

    • Article  

      On the stability of the shear flow of a viscoelastic fluid with slip along the fixed wall 

      Georgiou, Georgios C. (1996)
      In this paper we solve the time-dependent shear flow of an Oldroyd-B fluid with slip along the fixed wall. We use a non-linear slip model relating the shear stress to the velocity at the wall and exhibiting a maximum and ...

    • Article  

      On the stability of the simple shear flow of a Johnson-Segalman fluid 

      Georgiou, Georgios C.; Vlassopoulos, Dimitris (1998)
      We solve the time-dependent simple shear flow of a Johnson-Segalman fluid with added Newtonian viscosity. We focus on the case where the steady-state shear stress/shear rate curve is not monotonic. We show that, in addition ...

    • Article  

      Shear rejuvenation, aging and shear banding in yield stress fluids 

      Alexandrou, Andreas N.; Constantinou, N.; Georgiou, Georgios C. (2009)
      The purpose of this work is to simulate shear rejuvenation and aging effects in shear thinning yield stress fluids in a typical rotational rheometer and to provide a common framework to describe the behavior of yield stress ...

    • Article  

      Shear rejuvenation, aging and shear banding in yield stress fluids 

      Alexandrou, Andreas N.; Constantinou, N.; Georgiou, G. (2009)
      The purpose of this work is to simulate shear rejuvenation and aging effects in shear thinning yield stress fluids in a typical rotational rheometer and to provide a common framework to describe the behavior of yield stress ...

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