a lattice boltzmann method is applied to demonstrate the comparison results of simulating natural convection in an open end cavity using different hydrodynamic and thermal boundary conditions. the prandtl number in the present simulation is 0.71, rayleigh numbers are 104,105 and 106 and viscosities are selected 0.02 and 0.05. on-grid bounce-back method with first-order accuracy and non-slip met...

Hydrodynamic models have been very successful in describing the collective behavior of matter at RHIC, such as single particle spectra and elliptic flow. In particular the strong elliptic flow which, for the first time, reaches the hydrodynamic limit at RHIC, provides us with a new understanding of the nature of the quark-gluon plasma (QGP) created at RHIC as strongly interacting or correlated ...

BACKGROUND Thrombolysis is a dynamic and time-dependent process influenced by the haemodynamic conditions. Currently there is no model that allows for time-continuous, non-contact measurements under physiological flow conditions. The aim of this work was to introduce such a model. METHODS The model is based on a computer-controlled pump providing variable constant or pulsatile flows in a tube...

The purpose of this work is investigation changes in hydrodynamic parameters (absolute pressure, mass flow rates solution and secondary steam, steam velocity, irrigation density, pressure loss) along the length heat exchange tube a vertical falling film evaporator. obtained data distribution were used design evaporators.

This paper describes the development of the second‐generation Spherical Underwater Robot (SUR‐II). The new SUR‐II has an improved propulsion system structure, resulting in better performance compared with the original design. This paper focuses on the characteristics of the water‐jet thruster and the spherical hull of the SUR‐II. To analyse its hydrodynamic charac...

We show hydrodynamic boundary conditions to be the inherent consequence of the Onsager principle of minimum energy dissipation, provided the relevant effects of the wall potential appear within a thin fluid layer next to the solid wall, denoted the surface layer. The condition that the effect of the surface layer on the bulk hydrodynamics must be independent of its thickness h is shown to imply...

Considering a gas of self-propelled particles with binary interactions, we derive the hydrodynamic equations governing the density and velocity fields from the microscopic dynamics, in the framework of the associated Boltzmann equation. Explicit expressions for the transport coefficients are given, as a function of the microscopic parameters of the model. We show that the homogeneous state with...

We study the relativistically expanding electronpositron pair plasma formed by the process of vacuum polarization around an electromagnetic black hole (EMBH). Such processes can occur for EMBH’s with mass all the way up to 6 · 105M . Beginning with a idealized model of a ReissnerNordstrom EMBH with charge to mass ratio ξ = 0.1, numerical hydrodynamic calculations are made to model the expansion...