نتایج جستجو برای: velocity divergence

تعداد نتایج: 187274  

2013
JOHNNY GUZMÁN MICHAEL NEILAN M. NEILAN

Conforming finite element pairs for the three-dimensional Stokes problem on general simplicial triangulations are constructed. The pressure space simply consists of piecewise constants, where as the velocity space consists of cubic polynomials augmented with rational functions. We show the existence of a bounded Fortin projection and therefore the necessary LBB condition is satisfied. In additi...

Journal: :J. Comput. Physics 2008
Randall McDermott Stephen B. Pope

We describe a Lagrangian particle advection scheme which is intended for use in hybrid finite-volume (FV) large-eddy simulation/filtered density function (LES/FDF) methods for low-Mach flows, but which may also be applicable to unsteady probability density function (PDF) methods, direct numerical simulation (DNS) or any other situation where tracking fluid particles is of concern. A key ingredi...

1996
Astrid M. L. Kappers Susan F. te Pas Jan J. Koenderink

Psychophysical thresholds for the detection of divergence (expansion and contraction) in the presence of a translational component are determined. Stimuli consist of sparse random dot patterns. Lifetime, number of dots, divergence, and translational velocity are varied over a wide range. Moreover, the two major characteristics of a divergence pattern, namely, the direction of and the velocity a...

Journal: :CoRR 2015
Sumedh M. Joshi Peter J. Diamessis Derek T. Steinmoeller Marek Stastna Greg N. Thomsen

A method for post-processing the velocity after a pressure projection is developed that helps to maintain stability in an under-resolved, inviscid, discontinuous element-based simulation for use in environmental fluid mechanics process studies. The post-processing method is needed because of spurious divergence growth at element interfaces due to the discontinuous nature of the discretization u...

Journal: :Monthly Notices of the Royal Astronomical Society 1995

Journal: :Vision Research 2009
You Yun Lee Bérangère Granger-Donetti Chung Chang Tara L. Alvarez

PURPOSE The purpose of this study was to investigate how sustained convergence induces phoria adaptation and changes divergence dynamics. METHODS Near dissociated phoria and divergence step responses were recorded using an infrared eye movement monitor on four binocularly normal subjects. We tested three different adapting vergence positions (16 degrees , 6 degrees , and 0.5 degrees ) and mea...

2016
Gang Chen Minfu Feng Xiaoping Xie

This paper proposes and analyzes a class of robust globally divergence-free weak Galerkin (WG) finite element methods for Stokes equations. The new methods use the Pk/Pk−1 (k ≥ 1) discontinuous finite element combination for velocity and pressure in the interior of elements, and piecewise Pl/Pk (l = k − 1, k) for the trace approximations of the velocity and pressure on the inter-element boundar...

Journal: :SIAM J. Numerical Analysis 2005
Bernardo Cockburn Jayadeep Gopalakrishnan

In this paper, we introduce a new and efficient way to compute exactly divergence free velocity approximations for the Stokes equations in two space dimensions. We begin by considering a mixed method that provides an exactly divergence-free approximation of the velocity and a continuous approximation of the vorticity. We then rewrite this method solely in terms of the tangential fluid velocity ...

2014
Alexander Yu. Gelfgat

Context: A visualization of three-dimensional incompressible flows by divergence-free quasitwo-dimensional projections of velocity field on three coordinate planes is proposed. Objective: To visualize 3D incompressible flow by 3 two-dimensional plots. Method: It is argued that such divergence-free projections satisfying all the velocity boundary conditions are unique for a given velocity field....

1996
F. Bernardeau R. van de Weygaert F. R. Bouchet

We present a series of results investigating the Ω dependence of the distribution function of the large scale local cosmic velocity divergence, ∇ · v. Analytical studies using perturbation theory techniques indicate that the shape of this distribution should be strongly dependent on Ω. This dependence is all the more interesting as it does not involve biases of the galaxy distribution with resp...

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