The NIMROD and M3D / M3D-C codes now each have both a resistive MHD and a two-fluid (2F) capability including gyroviscosity and Hall terms. We describe: (1) a nonlinear 3D verification test in the resistive MHD regime in which the two codes are in detailed agreement , (2) new studies that illuminate the effect of two-fluid physics on spontaneous rotation in tokamaks, (3) studies of nonlinear re...

We perform global three-dimensional simulations of accretion disks integrating the compressible, non-viscous, but diffusive MHD equations. The disk is supposed to be isothermal. We make use of the ZEUS-3D code integrating the MHD equations and added magnetic diffusivity. We measure the efficiency of the angular-momentum transport. Various model simulations delivered transport parameters of α SS...

The Rayleigh-Stokes problem for a generalized Maxwell fluid in a porous half-space with a heated flat plate is investigated. For the description of such a viscoelastic fluid, a fractional calculus approach in the constitutive relationship model is used. By using the Fourier sine transform and the fractional Laplace transform, exact solutions of the velocity and the temperature are obtained. Som...

The numerical simulation of large-scale MHD instabilities in confined magnetic fusion devices (called a tokamak geometry), relies on solving a Fluid model coupled with Maxwell equations. Solving these equations in the complicated geometry of the tokamak is a highly demanding task due to the strong temporal and spatial multi-scale nature of the problem and the anisotropies induced by the magneti...

Introduction An initial feasibility study has been conducted to determine whether the advantages offered by an MHD conversion system for marine use are worth further investigations. 1 In this investigation a gas Brayton MHD cycle and one example of a liquid-metal Rankine MHD cycle were used; required were a power output of 11 megawatts and a given nuclear reactor capable of transmitting a tempe...

From a numerical study of the magnetohydrodynamic (MHD) equations we show, for the first time in three dimensions sd ­ 3d, that velocity and magnetic-field structure functions exhibit multiscaling, extended self-similarity (ESS), and generalized extended self-similarity (GESS). We propose a new shell model for homogeneous and isotropic MHD turbulence, which preserves all the invariants of ideal...

This paper presents a series of global three dimensional accretion disk simulations carried out in the cylindrical limit in which the vertical component of the gravitational field is neglected. The simulations use a cylindrical pseudo-Newtonian potential, ∝ 1/(R −Rg), to model the main dynamical properties of the Schwarzschild metric. The radial grid domain runs out to 60 Rg to minimize the inf...

an attempt is made for the first time to solve the quadratic and cubic model of magneto hydrodynamic poiseuille flow of phan-thein-tanner (ptt). series solution of magneto hydrodynamic (mhd) flow is developed by using homotopy perturbation method (hpm). results are presented graphically and the effects of non-dimensional parameters on the flow field are analyzed. the results obtained reveals ma...

In this article, a laminar magnetohydrodynamics (MHD) developing flow of an incompressible electrically conducting fluid subjected to an external magnetic field is considered. The aim of the study is to propose a correlation for computing the development length of the laminar MHD developing flow in a pipe. A numerical approach is considered to solve the problem. In the first step, the numerical...

The focus of this treatise is on the scrutiny MHD heat and mass transfer motion upper convection Maxwell (UCM) fluid in a thermally radiated flat plate. models flow equations were considered when there temperature difference: Cattaneo-Christov model Soret-Dufour mechanisms. A magnetic field firmness was inflicted opposition to flow. inspection controlled by partial differential (PDEs). Suitable...