نتایج جستجو برای: magneto hydrodynamic mhd

تعداد نتایج: 43163  

2008
Jianwen Zhang

Magnetohydrodynamics MHD concerns the motion of a conducting fluid in an electromagnetic field with a very wide range of applications. The dynamic motion of the fluids and the magnetic field strongly interact each other, and thus, both the hydrodynamic and electrodynamic effects have to be considered. The governing equations of the plane magnetohydrodynamic compressible flows have the following...

2003
Chad J. Ohlandt Terry Kammash Kenneth G. Powell

Parametric engineering models of the gas dynamic mirror (GDM) fusion propulsion systems[1, 2, 3, 4] have produced potentially feasible systems. However, these systems are extremely large and massive due to neutron or bremsstrahlung radiation losses for traditional and advanced fusion fuels, respectively. In order to explore designs beyond the simple uniform GDM represented by the parametric mod...

2008
JULIAN H. KROLIK

With the fundamental stress mechanism of accretion disks identified—correlated MHD turbulence driven by the magneto-rotational instability—it has become possible to make numerical simulations of accretion disk dynamics based on well-understood physics. A sampling of results from both Newtonian 3-d shearing box and general relativistic global disk MHD simulations is reported. Among other things,...

1998
M. SchuÈ

Two aspects of solar MHD are discussed in relation to the work of the MHD simulation group at KIS. Photospheric magneto-convection, the nonlinear interaction of magnetic ®eld and convection in a strongly strati®ed, radiating ̄uid, is a key process of general astrophysical relevance. Comprehensive numerical simulations including radiative transfer have significantly improved our understanding of...

2017
Peng Lu Xingwen Zheng Lulu Fang Hulin Huang Shu Xu Yezhen Yu

Liquid metal MHD (Magneto-Hydro-Dynamic) systems can be employed to produce electricity from a wide range of heat resources. In such a system, a low-boiling organic fluid and a high-temperature liquid metal fluid mix. The former evaporates, and carries the latter to flow through an MHD channel, where the electricity is generated. The mixing process and the gas-liquid flow characteristics will h...

2011
Zion Tsz Ho Tse Charles L Dumoulin Gari Clifford Michael Jerosch-Herold Daniel Kacher Raymond Kwong William Gregory Stevenson Ehud Jeruham Schmidt

Background An important requirement for successful cardiac MRI is accurate gating. However, obtaining proper Electrocardiogram (ECG) gating inside the MRI is a difficult problem, due to the Magneto-Hydro-Dynamic (MHD) effect, resulting in frequent intermittent gating. The MHD effect generates a voltage due to conductive blood flow perpendicular to B0, and distorts the real ECG. Intermittent gat...

2008
T. A. Gardiner

We present simulations of the propagation of magnetized jets. This work differs from previous studies in that the cross-sectional distributions of the jets’s state variables are derived from analytical models for magneto-centrifugal launching. The source is a magnetized rotator whose properties are specfied as boundary conditions. The jets in these simulations are considerably more complex than...

Journal: :Astrophysical Journal Supplement Series 2023

We introduce a new GPU-accelerated general-relativistic magneto-hydrodynamic (GR-MHD) code based on HARM which we call cuHARM. The is written in CUDA-C and uses OpenMP to parallelize multi-GPU setups. Our allows us run high resolution simulations of accretion disks the formation structure jets without need multi-node supercomputer infrastructure. A $256^3$ simulation well within reach an Nvidia...

2001
Jungyeon Cho Ethan T. Vishniac

We analyze 3D numerical simulations of driven incompressible magnetohydrodynamic (MHD) turbulence in a periodic box threaded by a moderately strong external magnetic field. We sum over nonlinear interactions within Fourier wavebands and find that the time scale for the energy cascade is consistent with the Goldreich-Sridhar model of strong MHD turbulence. Using higher order longitudinal structu...

Journal: :J. Comput. Physics 2014
Jorge A. Morales Matthieu Leroy Wouter J. T. Bos Kai Schneider

A volume penalization approach to simulate magnetohydrodynamic (MHD) flows in confined domains is presented. Here the incompressible visco-resistive MHD equations are solved using parallel pseudo-spectral solvers in Cartesian geometries. The volume penalization technique is an immersed boundary method which is characterized by a high flexibility for the geometry of the considered flow. In the p...

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