Simulation Of Three Dimensional Magnetohydrodynamic Flows Using A Pseudo Spectral Method With Volume Penalization
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Author | : Matthieu Leroy |
Publisher | : |
Total Pages | : 0 |
Release | : 2013 |
Genre | : |
ISBN | : |
Download Simulation of Three-dimensional Magnetohydrodynamic Flows Using a Pseudo-spectral Method with Volume Penalization Book in PDF, Epub and Kindle
A volume penalization method for the simulation of magnetohydrodynamic (MHD) flows in confined domains is presented. Incompressible resistive MHD equations are solved in 3D by means of a parallelized pseudo-spectral solver. The volume penalization technique is an immersed boundary method, characterized by a high flexibility in the choice of the geometry of the considered flow. In the present case, it allows the use of conditions different from periodic boundaries in a Fourier pseudo-spectral scheme. The numerical method is validated and its convergence is assessed for two- and three-dimensional hydrodynamical and MHD flows by comparing the numerical results with those of the literature or analytical solutions. Then, the spontaneous generation of kinetic and magnetic angular momentum is studied for confined 2D and 3D MHD flows. The influence of the Reynolds number and of the ratio of kinetic/magnetic energies is explored, as well as the differences induced by the boundary conditions. The fact that axisymmetric borders introduce a non-zero pressure term in the evolution equation of the angular momentum is essential to generate large values of the angular momentum. It is investigated whether this self-organization is exclusively observed in 2D flows by considering 3D MHD in the presence of a strong axial magnetic field. The last part is devoted to the simulation of a conducting fluid in a periodic cylinder with imposed axial and poloidal magnetic forcing, implying a resulting magnetic field. By varying the amplitude of the poloidal forcing, different dynamical states can be achieved. The effect of the Prandtl number on the threshold of the instabilities is then studied.
Author | : Salah Neffaa |
Publisher | : |
Total Pages | : 139 |
Release | : 2010 |
Genre | : |
ISBN | : |
Download Numerical Simulation of Magnetohydrodynamic Turbulence in Confined Domains Book in PDF, Epub and Kindle
In this thesis we developed a Fourier pseudo-spectral code coupled with the volume penalization for the simulation of turbulent MHD flows with non-periodic boundary conditions. This method was validated with classical and academic test-cases. Then we studied the influence of the confinement with walls in a 2D configuration for decaying MHD and we found four decaying regimes which depend on the initial conditions. We also discussed the phenomenon of spontaneous rotation, or spin-up, in 2D non-axisymmetric geometries, originally discovered in hydrodynamic flows. We showed the influence of the Reynolds number and the magnetic pressure on this phenomenon. Finally, simulations of MHD flows in wall bounded three-dimensional domains were addressed. The first results concerning the simulation of decaying MHD turbulence in a cylinder imposing Dirichlet boundary conditions for both the velocity and the magnetic field showed the validity of the code and suggest good prospects for developing more physically justified boundary conditions for the magnetic field.
Author | : Laila Guessous |
Publisher | : |
Total Pages | : 362 |
Release | : 1999 |
Genre | : |
ISBN | : |
Download A Pseudo-spectral Numerical Scheme for the Simulation of Natural Flows Book in PDF, Epub and Kindle
Author | : John P. Boyd |
Publisher | : Courier Corporation |
Total Pages | : 690 |
Release | : 2001-12-03 |
Genre | : Mathematics |
ISBN | : 0486411834 |
Download Chebyshev and Fourier Spectral Methods Book in PDF, Epub and Kindle
Completely revised text focuses on use of spectral methods to solve boundary value, eigenvalue, and time-dependent problems, but also covers Hermite, Laguerre, rational Chebyshev, sinc, and spherical harmonic functions, as well as cardinal functions, linear eigenvalue problems, matrix-solving methods, coordinate transformations, methods for unbounded intervals, spherical and cylindrical geometry, and much more. 7 Appendices. Glossary. Bibliography. Index. Over 160 text figures.
Author | : T. J. Chung |
Publisher | : |
Total Pages | : 40 |
Release | : 1994 |
Genre | : Spectral energy distribution |
ISBN | : |
Download Direct Numerical Simulation of Compressible Turbulent Flows Using Adaptive Spectral Element Method Book in PDF, Epub and Kindle
Author | : Nikolas A. Kanarēs |
Publisher | : |
Total Pages | : 176 |
Release | : 2012 |
Genre | : Cylinders |
ISBN | : |
Download Three-dimensional Direct Numerical Simulations of Hydrodynamic and Magnetohydrodynamic Flows Over an Obstacle in a Confined Geometry Book in PDF, Epub and Kindle
Author | : |
Publisher | : |
Total Pages | : 702 |
Release | : 1995 |
Genre | : Aeronautics |
ISBN | : |
Download Scientific and Technical Aerospace Reports Book in PDF, Epub and Kindle
Author | : Ming-Tsung Sun |
Publisher | : |
Total Pages | : 326 |
Release | : 1991 |
Genre | : Fluid dynamics |
ISBN | : |
Download Three-dimensional Time-dependent Fluid Flow Simulations Book in PDF, Epub and Kindle
Author | : Marina Kotovshchikova |
Publisher | : |
Total Pages | : |
Release | : 2007 |
Genre | : |
ISBN | : |
Download Numerical Simulation of 2D Flow Past a Dimpled Cylinder Using a Pseudospectral Method Book in PDF, Epub and Kindle
Pseudospectral method -- Navier-Stokes equations.
Author | : |
Publisher | : |
Total Pages | : 974 |
Release | : 1999 |
Genre | : Aeronautics |
ISBN | : |
Download International Aerospace Abstracts Book in PDF, Epub and Kindle