Showing papers on "Fluid parcel published in 1992"
TL;DR: In this paper, a class of finite-difference approximations to the evolution equations of fluid dynamics are discussed, where the inertial and forcing terms are separated such that forces are integrated along a parcel trajectory (the Lagrangian aspect), whereas advection of the variable is evaluated along the residual contour (the Eulerian aspect).
Abstract: This paper discusses a class of finite-difference approximations to the evolution equations of fluid dynamics These approximations derive from elementary properties of differential forms Values of a fluid variable ψ at any two points of a space-time continuum are related through the integral of the space-time gradient of ψ along an arbitrary contour connecting these two points (Stokes' theorem) Noting that spatial and temporal components of the gradient are related through the fluid equations, and selecting the contour composed of a parcel trajectory and an appropriate residual, leads to the integral form of the fluid equations, which is particularly convenient for finite-difference approximations In these equations, the inertial and forcing terms are separated such that forces are integrated along a parcel trajectory (the Lagrangian aspect), whereas advection of the variable is evaluated along the residual contour (the Eulerian aspect) The virtue of this method is an extreme simplicity of t
203 citations
01 Jan 1992
TL;DR: In this paper, an evaluation of general theoretical models pertinent to investigations of both compressible and incompressible MHD turbulence in the solar wind is made, and it is noted that the underlying description for turbulence investigations in solar wind should be 2D MHD, rather than the usual 3D description.
Abstract: An evaluation is made of general theoretical models pertinent to investigations of both compressible and incompressible MHD turbulence in the solar wind. It is noted that the underlying incompressible description for turbulence investigations in the solar wind should be 2D incompressible MHD, rather than the usual 3D description. 'Nearly incompressible' MHD can account for the observed density, temperature, and magnetic fluctuation spectra; the density fluctuations are found to be partially slaved to the magnetic field fluctuations, as well as to be generated by the incompressible flow field.
7 citations
5 citations
Journal Article•
2 citations
06 Jul 1992
1 citations
1 citations
TL;DR: In this paper, the analysis of air parcel trajectories affecting Shanghai indicates that the coming-direction of air parcels is different in various months, and that the transport track of trajectory (backward and forward) is closely related to the synoptic system, and also related to acid rain occurring in Shanghai region.
Abstract: The analysis of air parcel trajectories affecting Shanghai indicates that the coming-direction of air parcel is different in various months. The transport track of trajectory (backward and forward) is closely related to the synoptic system, and also related to acid rain occurring in Shanghai region.
1 citations
TL;DR: In this article, a modified equation of viscous fluid dynamics is considered and it is proved that any perturbation in a compressible fluid obeying such equation, propagates with finite speed, i.e. its support is bounded at each instant t > 0.
01 Jan 1992