Browsing by Subject "Velocity"
Now showing items 116 of 16

Article
Cessation of viscoplastic Poiseuille flow with wall slip
(2014)We solve numerically the cessation of axisymmetric Poiseuille flow of a HerschelBulkley fluid under the assumption that slip occurs along the wall. The Papanastasiou regularization of the constitutive equation is employed. ...

Article
A consistent velocity approximation for variabledensity flow and transport in porous media
(2013)Using a finitevolume nodalbased code, we introduce a new consistent numerical scheme for approximating the seepage velocity in variabledensity flow in porous media. It has been known from previous works that the lack ...

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
Fast cloth animation on walking avatars
(2001)This paper describes a fast technique for animating clothing on walking humans. It exploits a massspring cloth model but applies a new velocity directional modification approach to overcome its superelasticity. The ...

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. ...

Article
Numerical simulations of turbulent flows within an infinite array of randomly placed cylinders
(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
Representing anisotropy of twopoint secondorder turbulence velocity correlations using structure tensors
(2008)A locally homogeneous representation for the twopoint, secondorder turbulent velocity fluctuation Rij(x,r) = 〈u′i(x)u′i(x+r)〉 is formulated in terms of three linearly independent structure tensors [Kassinos et al., J. ...

Conference Object
Sedimentation of heavy crystal particles under microgravity conditions
(American Institute of Aeronautics and Astronautics Inc, AIAA, 1998)Crystals grown from specially prepared liquid solutions have important industrial applications such as in biochemical processes, refining etc. The efficiency of these crystals is usually a function of their size. Therefore, ...

Article
Speed selection mechanism for propagating fronts in reactiondiffusion systems with multiple fields
(2002)We introduce a speed selection mechanism for front propagation in reactiondiffusion systems with multiple fields. This mechanism applies to pulled and pushed fronts alike, and operates by restricting the fields to large ...

Article
Speed selection mechanism for propagating fronts in reactiondiffusion systems with multiple fields
(2002)We introduce a speed selection mechanism for front propagation in reactiondiffusion systems with multiple fields. This mechanism applies to pulled and pushed fronts alike, and operates by restricting the fields to large ...

Article
Speed selection mechanism for propagating fronts in reactiondiffusion systems with multiple fields123
(2002)We introduce a speed selection mechanism for front propagation in reactiondiffusion systems with multiple fields. This mechanism applies to pulled and pushed fronts alike, and operates by restricting the fields to large ...

Article
A structurebased model for the transport of passive scalars in homogeneous turbulent flows
(2016)A structurebased model has been constructed, for the first time, for the study of passive scalar transport in turbulent flows. The scalar variance and the largescale scalar gradient variance are proposed as the two ...

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

Conference Object
A twophase fluid model of crystal settling under variable gravity
(American Institute of Aeronautics and Astronautics Inc, AIAA, 1999)A twophase fluid model of crystal particle motion in a liquid is presented. The model includes a liquid and a solid phase as continua and forces due to pressure, viscous stresses, variable gravity and fluid drag. The model ...

Article
Velocities for moving random surfaces
(2003)For a stationary twodimensional random field evolving in time, we derive statistical distributions of appropriately defined velocities. The results are based on a generalization of the Rice formula. We discuss importance ...

Article
Weakly compressible Poiseuille flows of a HerschelBulkley fluid
(2009)In this work, we derive approximate semianalytical solutions of the steady, creeping, weakly compressible plane and axisymmetric Poiseuille flows of a HerschelBulkley fluid. Since the flow is weakly compressible, the ...