نتایج جستجو برای: hydrodynamics

تعداد نتایج: 25793  

Mohammed Rahim Ostadzehi Mortaza Zivdar Rahbar Rahimi, Taleb Zarei

This research includes both experimental and CFD investigation in the hydrodynamic behavior of a new type of column tray introduced as “Concap” tray. The proposed column tray is used in contactor columns especially in stripping columns. The hydrodynamics of this Concap tray is investigated in a 1.2m in diameter column. Using air-water system, the experiments were performed for different liquid ...

Journal: :Physical review letters 2012
Kristan Jensen Matthias Kaminski Pavel Kovtun René Meyer Adam Ritz Amos Yarom

We present a generating functional which describes the equilibrium thermodynamic response of a relativistic system to external sources. A variational principle gives rise to constraints on the response parameters of relativistic hydrodynamics without making use of an entropy current. Our method reproduces and extends results available in the literature. It also provides a technique for efficien...

2010
M. M. Basko J. Maruhn

In 2009 a major next step was made in our effort to develop a two-dimensional (2D) radiation-hydrodynamics code for laser plasma simulations, namely, a new scheme for solving the radiation transport equation has been constructed and tested. The new code has been named RALEF-2D (Radiative Arbitrary LagrangianEulerian Fluid dynamics). The RALEF-2D code is based on the CAVEAT hydrodynamics package...

2008
D. Strottman

The relativistic extension of non-relativistic hydrodynamics suffers from notorious difficulties. In non-relativistic hydrodynamics where difficulties also abound, it has proved a useful supplement to study lattice models which can imitate viscous fluid flow. In this paper we construct a relativistic spacetime lattice and construct a dynamics of points, thus a relativistic cellular automaton ov...

2008
Scott C. Smith Joan M. Centrella Sean P. Clancy

We have developed a 3-D Eulerian hydrodynamics code to model sources of gravitational radiation. The code is written in cylindrical coordinates (̟, z, φ) and has moving grids in the ̟ and z-directions. We use Newtonian gravity and calculate the gravitational radiation in the quadrupole approximation. This code has been tested on a variety of problems to verify its accuracy and stability, and the ...

1999
T. W. Baumgarte

We report on our numerical implementation of fully relativistic hydrodynamics coupled to Einstein’s field equations in three spatial dimensions. We briefly review several steps in our code development, including our recasting of Einstein’s equations and several tests which demonstrate its advantages for numerical integrations. We outline our implementation of relativistic hydrodynamics, and pre...

2013
Nikhil Padhye

Lagrangian symmetries and concomitant generalized Bianchi identities associated with the relabeling of fluid elements are found for hydrodynamics and magnetohydrodynamics (MHD). In hydrodynamics, relabeling results in Ertel's theorem of conservation of potential vorticity, while in MHD it yields the conservation of cross helicity. The symmetries of the reduction from Lagrangian (material) to Eu...

2008
Jean-Yves Ollitrault

Relativistic hydrodynamics is essential to our current understanding of nucleus-nucleus collisions at ultrarelativistic energies (current experiments at the Relativistic Heavy Ion Collider, forthcoming experiments at the CERN Large Hadron Collider). This is an introduction to relativistic hydrodynamics for graduate students. It includes a detailed derivation of the equations, and a description ...

2013
Mostafa Keshavarz Mostafa Keshavarz Moraveji

In this study hydrodynamics of a fluidized bed reactor with fumed silica nano particles was modeled using CFD method. Hydrodynamics parameters such as gas and solid velocity and void fraction have been investigated. The minimum fluidization velocity was around 0.0115 m/s at solids volume fraction of 0.0077. Fluidization process was involving a high expansion ratio of bed and without large bubbl...

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