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Tuesday, August 11, 2020 | History

3 edition of Axisymmetric two-dimensional computation of magnetic field dragging in accretion disks found in the catalog.

Axisymmetric two-dimensional computation of magnetic field dragging in accretion disks

Mauricio Reyes-Ruiz

Axisymmetric two-dimensional computation of magnetic field dragging in accretion disks

by Mauricio Reyes-Ruiz

  • 119 Want to read
  • 6 Currently reading

Published by National Aeronautics and Space Administration in [Washington, D.C .
Written in English

    Subjects:
  • Accretion (Astrophysics),
  • Cosmic magnetic fields.

  • Edition Notes

    Other titlesAxisymmetric two dimensional computation of magnetic field dragging in accretion disks, Astrophysical journal.
    StatementMauricio Reyes-Ruiz and Tomasz F. Stepinski.
    SeriesNASA contractor report -- NASA CR-204588
    ContributionsStepinski, T. F.
    The Physical Object
    FormatMicroform
    Paginationp. 653-665
    Number of Pages665
    ID Numbers
    Open LibraryOL18657692M

      Efficient and accurate computation of null geodesics in the vicinity of spinning black holes is important for studies of active galaxies, X-ray binaries, and other accreting black hole systems. The radiated flux from accretion disks mostly originates in the innermost radii, where relativistic effects are important for understanding by:   Strong Field Effects on Emission Line Profiles: Kerr Black Holes and Warped Accretion Disks Yan Wang and Xiang-Dong Li The Astrophysical Journal IOPscience. Measuring black hole spin by the continuum-fitting method: effect of deviations from the Novikov-Thorne disc model: BH spin from realistic temperature profiles.

    You can write a book review and share your experiences. Other readers will always be interested in your opinion of the books you've read. Whether you've loved the book or not, if you give your honest and detailed thoughts then people will find new books that are right for them.   Effects of out-of-plane shear flows on asymmetric magnetic reconnect are investigated in a two-dimensional (2D) hybrid model with an initial Harris sheet equilibrium. It is found that the out-of-plane flow with an in-plane shear can significantly change the asymmetric reconnection process as well as the related geometry. The magnetic flux, out-of-plane magnetic field, in-plane flow vorticity Cited by: 2.

      A uniform magnetic field of magnitude T is directed perpendicular to the plane of a rectangular loop having dimensions cm by 11 cm. Find the magnetic flux through the loop. T. Zwerger & E. Muller: Dynamics and gravitational wave signature of axisymmetric rotational core collapse¨ sequence (Endal & So a ). If, on the other side, magnetic elds or shear viscosity are able to reduce the angular momen-tum in the interior of the star suf ciently, its iron core will ro-.


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Axisymmetric two-dimensional computation of magnetic field dragging in accretion disks by Mauricio Reyes-Ruiz Download PDF EPUB FB2

Get this from a library. Axisymmetric two-dimensional computation of magnetic field dragging in accretion disks. [Mauricio Reyes-Ruiz; T F Stepinski]. lations and low resolution, respectively.

Simulating disks at lower accretion rates is much more demanding and may be beyond reach for the near future. Obviously, axisymmetric, two-dimensional (2D) simulations are computationally much less expensive than three-dimensional (3D), so one can simulate a wider range of systems in 2D.

What. The accretion flow in the disk drags and distorts field lines, amplifying the magnetic field in the process. Inside the disk the radial component of the field is sheared into a toroidal component.

Numerical Simulation of Vertical Oscillations in an Axisymmetric Thick Accretion Flow around a Black Hole axisymmetric, two dimensional inviscid ac-cretion considering only inviscid and non-magnetic ow, detailed discussion on viscous stress tensor is out of the scope of thisCited by: 2.

A numerical study of two-dimensional plasma flows in coaxial channels of plasma accelerators is presented. Two new results are obtained. First, for the computation of MHD problems belonging to the class under consideration, Zalesak’s method is used.

It is based on an explicit finite difference scheme with flux correction. This method is free of space splitting, and, therefore, is well Cited by: 2. Reyes-Ruiz and T. Stepinski() Accretion Discs Dynamos in the Presence of an External Magnetic Field.

Monthly Notices of the Royal Astronomical Society,M. Reyes-Ruiz and T. Stepinski() Axisymmetric Two-Dimensional Computation of Magnetic Field Dragging in Accretion Disks. Astrophysical Journal,  An experimental investigation is made of the effect of axisymmetric two-dimensional magnetic field on the forming of plasma and on the configuration of cathode spots in a vacuum-arc discharge.

It is demonstrated that a magnetic field with a transverse (relative to the discharge axis) component has a significant effect on the shape of plasma column and on the rate of expansion of the Cited by: 2.

Introduction. The study of unsteady squeezing of a viscous incompressible fluid between two parallel plates in motion normal to their own surfaces independent of each other and arbitrary with respect to time has been regarded as one of the most important research topics due to its wide spectrum of scientific and engineering applications such as hydrodynamical machines, polymer processing Cited by: 3.

Figure 4: Plots of the magnetic field in (a) x -direction and (b) y -direction. The dashed curves are from the OPERA3D calculation, whereas the solid curves are from Eq. (1). CONCLUSION A three-dimensional (3D) design was presented of a non-axisymmetric periodic permanent magnet focusing system which will be used to focus a large-aspect-ratio.

Planet. Space Sci. Vol. 21, pp. 97 to Pergamon Press. Printed in Northern Ireland THE ALTERATION OF THE MAGNETIC FIELD OF TRANSIENT VARIATIONS BY AN AXISYMMETRIC ISLAND IN A LARGE OCEAN H.

GRETTON Department of Applied Mathematics and Computing Science, Sheffield University, Sheffield, England (Received 6 July ) Abstractt is shown how the Author: H.W.

Gretton. two-dimensional current and ac = 3 for an axisymmetric current. If a = a, the viscous forces greatly exceed the inertial forces, and do so for all time, provided that the Julian number J = v3g’2/q4 9 1 for two-dimensional currents or that vg‘/Q % 1 for axisymmetric currents, where g or Q is the constant of proportionality between.

Magnetic field B z (red line) and relativ e errors δB of the magnetic field B for the single coil “c1”, calculated on the symmetry line r = 0 by 5FD2N (blue lines) and 9FD4U (green lines) methods using three different mesh sizes: 64 × 64, × Data were acquired for a two-dimensional (2D) separating boundary layer at five different Reynolds numbers based on step height (Reh), spanningand for a three-dimensional (3D) separating boundary layer at Reh = and Reynolds number effects were investigated in the 2D cases using mean-velocity field, streamwise and wall-File Size: 3MB.

Non-Axisymmetric Equilibrium Reconstruction for Stellarators, Reversed Field Pinches and Tokamaks J.D. Hanson1, S.A.

Lazerson2, plasmas. 3D reconstruction tools with the functionality of proven two-dimensional a non-axisymmetric but field-period symmetric equilibrium is modeled with closedFile Size: 1MB.

Cowling Anti-Dynamo Theorem One of the most important results in slow, kinematic dynamo theory is credited to Cowling. The so-called Cowling anti-dynamo theorem states that: An axisymmetric magnetic field cannot be maintained via dynamo action. Let us attempt to prove this proposition.

We adopt standard cylindrical polar coordinates. In [16], a two-dimensional analytical method was proposed to predict the performances of axial magnetic-field-modulated brushless double-rotor machines to reduce the computation time. The computation is based on the solution of Laplace’s or Poisson’s equation with boundary conditions.

Evolution of Two-Dimensional Field Variables Time evolution of the computed 2D density and current density fields during the explosion of the copper wire is shown for the two formulations in Figures andat elements per wire.

The internal part of the lensed accretion disk at r h ≤ r ≤ r ISCO adjoining to the event horizon in the case of rotating black hole with spin a = The brightest point in accretion disk is at radius r ISCO = (green ring) and corresponds to the photon trajectory with λ Cited by: 6.

When a black hole accretes plasmas at very low accretion rate, an advection-dominated accretion flow (ADAF) is formed. In an ADAF, relativistic electrons emit soft gamma-rays via Bremsstrahlung. Some MeV photons collide with each other to materialize as electron-positron pairs in the magnetosphere.

Such pairs efficiently screen the electric field along the magnetic field lines, when the Cited by: 1. Spatial measurement in rotating magnetic field plasma acceleration method by using two-dimensional scanning instrument and thrust stand T.

Furukawa,1,a) K. Takizawa, 1K. Yano, D. Kuwahara,2 and S. Shinohara2 1The Graduate School of Engineering, Tokyo University of Agriculture and Technology, TokyoJapan. open boundary axisymmetric electric and magnetic fi eld problems is presented.

Firstly, the application of the class ical Kelvin transformation in the analysis of two-dimensional o pen boundary field problems with translational symmetry is revie wed. Upon this, an open boundary technique applicable to axis ymmetric and.Two-Dimensional and Axisymmetric Unsteady Flows due to Normally Expanding or Contracting Parallel Plates Saeed Dinarvand1 and Abed Moradi2 1 Young Researchers Club, Islamic Azad University, Central Tehran Branch, Tehran, Iran 2 Mechanical Engineering Department, Islamic Azad University, Central Tehran Branch, Tehran, Iran.A uniform magnetic field is directed perpendicular to the xy-plane.

A m length of conducting wire is to be formed into a two-dimensional shape and then placed in the xy-plane. Which shape would experience the greatest magnetic flux through it?

A. a square. B. a circle. C.a rectangle, its length twice its width.