Browsing by Subject "Shear flow"
Now showing items 120 of 25

Article
An analytical solution for rapidly distorted turbulent shear flow in a rotating frame
(2006)In this study we apply rapid distortion theory to the case of nonstratified homogeneous turbulence that is sheared in a frame that counterrotates 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 nonzero slip yield stress
(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
(TSFP9, 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
(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
(2006)The shear response of a series of polymerclay gels has been investigated by means of rheology and smallangle 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 mribased mouththroat geometry
(International Symposium on Turbulence and Shear Flow Phenomena, TSFP10, 2017)The mouththroat 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
(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 nearwall submerged cylinder on the potential motion of bed and suspended loads
(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
(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 liquidmetal flow in an insulating pipe subjected to a strong fringing magnetic field
(2012)This paper addresses liquidmetal 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
(TSFP9, 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 CrackFace Normal and Shear Stress Loading on Hydraulic FractureTip Singular Plastic Fields
(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 OldroydB fluid with slip along the fixed wall
(1998)We consider the timedependent shear flow of an OldroydB fluid with slip along the fixed wall. Slip is allowed by means of a generic slip equation predicting that the shear stress is a nonmonotonic function of the velocity ...

Article
A note on the unbounded creeping flow past a sphere for Newtonian fluids with pressuredependent viscosity
(2015)We investigate theoretically isothermal, incompressible, creeping Newtonian flows past a sphere, under the assumption that the shear viscosity is pressuredependent, varying either linearly or exponentially with pressure. ...

Conference Object
Numerical simulation of injection mold filling for semisolid materials
(ASME, 1995)Processing of metals and metal matrix composites in the semisolid 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
(TSFP9, 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
(1996)In this paper we solve the timedependent shear flow of an OldroydB fluid with slip along the fixed wall. We use a nonlinear 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 JohnsonSegalman fluid
(1998)We solve the timedependent simple shear flow of a JohnsonSegalman fluid with added Newtonian viscosity. We focus on the case where the steadystate shear stress/shear rate curve is not monotonic. We show that, in addition ...

Article
Shear rejuvenation, aging and shear banding in yield stress fluids
(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
(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 ...