Large CFD problems are often solved using iterative methods. Preconditioning is mandatory to accelerate the convergence of iterative methods. This paper presents new results using several preconditioning techniques. These preconditoners are non-standard in the CFD community. Several numerical tests were carried out for solving three-dimensional incompressible, compressible and magneto-hydrodyna...

We present results on modeling magnetic flux tubes in an unstably stratified medium and the flows around them using 2D axisymmetric magneto-hydrodynamic (MHD) simulations. The study is motivated by the formation of magnetic field concentrations at the solar surface in sunspots and magnetic pores and the large-scale flow patterns associated with them. The simulations provide consistent, self-mai...

In this paper we present a mathematical analysis for the magneto hydrodynamic (MHD) axi-symmetric stagnation-point flow and heat transfer over a shrinking sheet which shrinks axi-symmetrically in its own plane. The governing partial differential equations along with the boundary conditions are first cast into a dimensionless form and then these equations are solved numerically by shooting techn...

Prediction of solar storms has become a very important issue due to the fact that they can affect dramatically the telecommunication and electrical power systems in the earth. As a result, a lot of research is being doing in this direction, space weather forecast. Magneto-Hydrodynamics systems are being studied in order to analyze the space plasma dynamics, and techniques which have been broadl...

This work revisits the star formation rate (SFR) model of Krumholz and McKee, extends it to the case of a magnetized medium, and verifies it with a set of numerical simulations of driven, supersonic, magneto-hydrodynamic (MHD) turbulence, where collapsing cores are captured with accreting sink particles. The main results are: i) a new physical interpretation of the critical density for star for...

Keywords: MHD flow control Nonlinear boundary control Active mixing enhancement Distributed parameter systems a b s t r a c t A nonlinear Lyapunov-based boundary feedback control law is proposed for mixing enhancement in a 2D magnetohydrodynamic (MHD) channel flow, also known as Hartmann flow, which is electrically conducting, incompressible, and subject to an external transverse magnetic field...

In this paper, we study the steady and unsteady magneto hydro dynamic (MHD) viscous, incompressible free and forced convective flow of an electrically conducting Newtonian fluid through a porous medium in the presence of appreciable thermal radiation heat transfer and surface temperature oscillation taking hall current into account. The fluid is assumed to be optically-thin and magnetic Reynold...

In recent years, the study of magnetohydrodynamic (MHD) accretion flow around compact objects has become very important since the magnetic field in ubiquitous in the universe and it should play a part in the black hole accretion, especially close to the inner disk. The pioneering works of Mestel (1967) and Weber & Davis (1967) etc. were further extended by Chakrabarti (1990) for rotating compac...

Abstract Recent studies suggest that the magnetic field may play an important role in formation of giant planets during final stage process. In this paper, we construct a circumplanetary system around planet is to investigate effects planetary on accretion process at stage. We find early times our magneto-hydrodynamic (MHD) simulation, loops connecting and material inflate upward due build-up t...