نتایج جستجو برای: velocity divergence

تعداد نتایج: 187274  

Journal: :Physical review. E, Statistical, nonlinear, and soft matter physics 2002
James P Gleeson

Recently Vlad et al. [Phys. Rev. E. 63, 066304 (2001)] applied the method of decorrelation trajectories to the transport of tracers in stochastic velocity fields with constant drift, and found that the average Lagrangian velocity is smaller than the Eulerian average. As this contradicts a theoretical result due to Lumley [in Mécanigue de la Turbulence, International Conference of the CNRS, Mars...

2015
Jean-Paul Caltagirone Stéphane Vincent

A new scalar projection method presented for simulating incompressible flows with variable density is proposed. It reverses conventional projection algorithm by computing first the irrotational component of the velocity and then the pressure. The first phase of the projection is purely kinematics. The predicted velocity field is subjected to a discrete Hodge-Helmholtz decomposition. The second ...

Journal: :J. Visualization 2010
Xiaotian Shi Jun Chen Zhensu She

Vorticity, x; velocity divergence, r u ~; and the magnitude of pressure gradient, rp j j are visualized in a same flow domain, to reveal large-scale, dilatation and shocklet structures in a compressible mixing layer from direct numerical simulation results. We simulated 2-dimensional (2-D) and 3-dimensional (3-D) compressible mixing layers with a third-order Discontinuous Galerkin method (Cockb...

2003
Marcin Kiraga Michael A. Strauss Andrzej Kudlicki François R. Bouchet

We present a numerical study of the relation between the cosmic peculiar velocity field and the gravitational acceleration field. We show that on mildly non-linear scales (4–10 hMpc Gaussian smoothing), the distribution of the Cartesian coordinates of each of these fields is well approximated by a Gaussian. In particular, their kurtoses and negentropies are small compared to those of the veloci...

Journal: :Studia Mathematica 2021

We consider a massless tracer particle moving in random, stationary, isotropic and divergence free velocity field. identify class of fields for which the limit laws appropriately scaled trajectory processes is non-Gaussian Rosenb

Journal: :Climate Dynamics 2022

Abstract In this study, sea ice concentration (SIC) budgets were calculated for five ocean-sea reanalyses (CFSR, C-GLORSv7, GLORYS12v1, NEMO-EnKF and ORAS5), in the Southern Ocean compared with observations. Benefiting from assimilation of SIC, reanalysis products display a realistic representation extent as well area. However, when applying SIC budget diagnostics to decompose changes into cont...

1999
Michael P. Brenner

This paper considers a mixture of sedimenting particles at low Reynolds numbers and volume fractions. Simple theoretical arguments have long suggested that for a random suspension of particles in an infinite system, the fluctuations in the velocity about the mean should diverge with system size. On the other hand, experiments have shown no such divergence. The primary goal of this paper is to e...

Journal: :Physical review. E, Statistical physics, plasmas, fluids, and related interdisciplinary topics 2000
Santos

A compressible flow characterized by a velocity field u(x)(x, t)=ax/(1+at) is analyzed by means of the Boltzmann equation and the Bhatnagar-Gross-Krook kinetic model. The sign of the control parameter (the longitudinal deformation rate a) distinguishes between an expansion (a>0) and a condensation (a<0) phenomenon. The temperature is a decreasing function of time in the former case, while it is...

2016
Bernhard Wieneke

This paper discusses the propagation of the instantaneous uncertainty of PIV measurements to statistical and instantaneous quantities of interest derived from the velocity field. The expression of the uncertainty of vorticity, velocity divergence, mean value and Reynolds stresses is derived. It is shown that the uncertainty of vorticity and velocity divergence requires the knowledge of the spat...

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