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Numerical Simulation Of Magnetohydrodynamic Turbulence In Confined Domains
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Book Synopsis Numerical Simulation of Magnetohydrodynamic Turbulence in Confined Domains by : Salah Neffaa
Download or read book Numerical Simulation of Magnetohydrodynamic Turbulence in Confined Domains written by Salah Neffaa and published by . This book was released on 2010 with total page 139 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.
Book Synopsis Turbulence in Magnetohydrodynamics by : Andrey Beresnyak
Download or read book Turbulence in Magnetohydrodynamics written by Andrey Beresnyak and published by Walter de Gruyter GmbH & Co KG. This book was released on 2019-07-08 with total page 286 pages. Available in PDF, EPUB and Kindle. Book excerpt: Magnetohydrodynamics describes dynamics in electrically conductive fluids. These occur in our environment as well as in our atmosphere and magnetosphere, and play a role in the sun's interaction with our planet. In most cases these phenomena involve turbulences, and thus are very challenging to understand and calculate. A sound knowledge is needed to tackle these problems. This work gives the basic information on turbulence in nature, comtaining the needed equations, notions and numerical simulations. The current state of our knowledge and future implications of MHD turbulence are outlined systematically. It is indispensable for all scientists engaged in research of our atmosphere and in space science.
Book Synopsis Hydrodynamic and Magnetohydrodynamic Turbulent Flows by : A. Yoshizawa
Download or read book Hydrodynamic and Magnetohydrodynamic Turbulent Flows written by A. Yoshizawa and published by Springer Science & Business Media. This book was released on 2013-03-14 with total page 426 pages. Available in PDF, EPUB and Kindle. Book excerpt: TUrbulence modeling encounters mixed evaluation concerning its impor tance. In engineering flow, the Reynolds number is often very high, and the direct numerical simulation (DNS) based on the resolution of all spatial scales in a flow is beyond the capability of a computer available at present and in the foreseeable near future. The spatial scale of energetic parts of a turbulent flow is much larger than the energy dissipative counterpart, and they have large influence on the transport processes of momentum, heat, matters, etc. The primary subject of turbulence modeling is the proper es timate of these transport processes on the basis of a bold approximation to the energy-dissipation one. In the engineering community, the turbulence modeling is highly evaluated as a mathematical tool indispensable for the analysis of real-world turbulent flow. In the physics community, attention is paid to the study of small-scale components of turbulent flow linked with the energy-dissipation process, and much less interest is shown in the foregoing transport processes in real-world flow. This research tendency is closely related to the general belief that universal properties of turbulence can be found in small-scale phenomena. Such a study has really contributed much to the construction of statistical theoretical approaches to turbulence. The estrangement between the physics community and the turbulence modeling is further enhanced by the fact that the latter is founded on a weak theoretical basis, compared with the study of small-scale turbulence.
Book Synopsis Magnetohydrodynamic Turbulence by : Dieter Biskamp
Download or read book Magnetohydrodynamic Turbulence written by Dieter Biskamp and published by Cambridge University Press. This book was released on 2003-07-31 with total page 313 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book presents an introduction to, and modern account of, magnetohydrodynamic (MHD) turbulence, an active field both in general turbulence theory and in various areas of astrophysics. The book starts by introducing the MHD equations, certain useful approximations and the transition to turbulence. The second part of the book covers incompressible MHD turbulence, the macroscopic aspects connected with the different self-organization processes, the phenomenology of the turbulence spectra, two-point closure theory, and intermittency. The third considers two-dimensional turbulence and compressible (in particular, supersonic) turbulence. Because of the similarities in the theoretical approach, these chapters start with a brief account of the corresponding methods developed in hydrodynamic turbulence. The final part of the book is devoted to astrophysical applications: turbulence in the solar wind, in accretion disks, and in the interstellar medium. This book is suitable for graduate students and researchers working in turbulence theory, plasma physics and astrophysics.
Book Synopsis Studying Turbulence Using Numerical Simulation Databases - III. by : Center for Turbulence Research (U.S.)
Download or read book Studying Turbulence Using Numerical Simulation Databases - III. written by Center for Turbulence Research (U.S.) and published by . This book was released on 1990 with total page 366 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Studying Turbulence Using Numerical Simulation Databases - V. by : Center for Turbulence Research (U.S.)
Download or read book Studying Turbulence Using Numerical Simulation Databases - V. written by Center for Turbulence Research (U.S.) and published by . This book was released on 1994 with total page 496 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Three-dimensional Direct Numerical Simulations of Hydrodynamic and Magnetohydrodynamic Flows Over an Obstacle in a Confined Geometry by : Nikolas A. Kanarēs
Download or read book Three-dimensional Direct Numerical Simulations of Hydrodynamic and Magnetohydrodynamic Flows Over an Obstacle in a Confined Geometry written by Nikolas A. Kanarēs and published by . This book was released on 2012 with total page 176 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Studying Turbulence Using Numerical Simulation Databases by :
Download or read book Studying Turbulence Using Numerical Simulation Databases written by and published by . This book was released on 1996 with total page 472 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Theory and Simulation of Real and Ideal Magnetohydrodynamic Turbulence by : John V. Shebalin
Download or read book Theory and Simulation of Real and Ideal Magnetohydrodynamic Turbulence written by John V. Shebalin and published by BiblioGov. This book was released on 2013-08 with total page 34 pages. Available in PDF, EPUB and Kindle. Book excerpt: Incompressible, homogeneous magnetohydrodynamic (MHD) turbulence consists of fluctuating vorticity and magnetic fields, which are represented in terms of their Fourier coefficients. Here, a set of five Fourier spectral transform method numerical simulations of two-dimensional (2-D) MHD turbulence on a 512(sup 2) grid is described. Each simulation is a numerically realized dynamical system consisting of Fourier modes associated with wave vectors k, with integer components, such that k = k less than or equal to k(sub max). The simulation set consists of one ideal (non-dissipative) case and four real (dissipative) cases. All five runs had equivalent initial conditions. The dimensions of the dynamical systems associated with these cases are the numbers of independent real and imaginary parts of the Fourier modes. The ideal simulation has a dimension of 366104, while each real simulation has a dimension of 411712. The real runs vary in magnetic Prandtl number P(sub M), with P(sub M) is a member of {0.1, 0.25, 1, 4}. In the results presented here, all runs have been taken to a simulation time of t = 25. Although ideal and real Fourier spectra are quite different at high k, they are similar at low values of k. Their low k behavior indicates the existence of broken symmetry and coherent structure in real MHD turbulence, similar to what exists in ideal MHD turbulence. The value of PM strongly affects the ratio of kinetic to magnetic energy and energy dissipation (which is mostly ohmic). The relevance of these results to 3-D Navier-Stokes and MHD turbulence is discussed.
Book Synopsis Numerical Simulation of Turbulent Magnetohydrodynamic Flows by : Jean-François Dietiker
Download or read book Numerical Simulation of Turbulent Magnetohydrodynamic Flows written by Jean-François Dietiker and published by . This book was released on 2001 with total page 446 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Multiscale and Multiresolution Approaches in Turbulence by : Pierre Sagaut
Download or read book Multiscale and Multiresolution Approaches in Turbulence written by Pierre Sagaut and published by World Scientific. This book was released on 2006 with total page 356 pages. Available in PDF, EPUB and Kindle. Book excerpt: This unique book gives a general unified presentation of the use of the multiscale/multiresolution approaches in the field of turbulence. The coverage ranges from statistical models developed for engineering purposes to multiresolution algorithms for the direct computation of turbulence. It provides the only available up-to-date reviews dealing with the latest and most advanced turbulence models (including LES, VLES, hybrid RANS/LES, DES) and numerical strategies.The book aims at providing the reader with a comprehensive description of modern strategies for turbulent flow simulation, ranging from turbulence modeling to the most advanced multilevel numerical methods.
Book Synopsis Simulation of Three-dimensional Magnetohydrodynamic Flows Using a Pseudo-spectral Method with Volume Penalization by : Matthieu Leroy
Download or read book Simulation of Three-dimensional Magnetohydrodynamic Flows Using a Pseudo-spectral Method with Volume Penalization written by Matthieu Leroy and published by . This book was released on 2013 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.
Book Synopsis Turbulence Over a Compliant Surface by : Sheng Xu
Download or read book Turbulence Over a Compliant Surface written by Sheng Xu and published by . This book was released on 2002 with total page 324 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Turbulence and Instabilities by : O.M. Belotserkovskii
Download or read book Turbulence and Instabilities written by O.M. Belotserkovskii and published by . This book was released on 2000 with total page 364 pages. Available in PDF, EPUB and Kindle. Book excerpt: Monograph presents the newest results in the numerical modeling and computer simulation of turbulence.
Book Synopsis Numerical Simulation of 3-D Equilibrium and Nonequilibrium Seeded-air Flows in Magnetohydrodynamic Channels by : Sumeet Gupta
Download or read book Numerical Simulation of 3-D Equilibrium and Nonequilibrium Seeded-air Flows in Magnetohydrodynamic Channels written by Sumeet Gupta and published by . This book was released on 2004 with total page 84 pages. Available in PDF, EPUB and Kindle. Book excerpt: Magnetohydrodynamics (MHD) is the study of flow under the effects of an electromagnetic field. MHD acceleration is a critical technology necessary in order to develop MHD energy bypass scramjet engines for space launch and cruise vehicles. In the present work, a new parabolized Navier-Stokes (PNS) algorithm has been developed to efficiently compute the 3-D, supersonic, viscous, turbulent flow in MHD channels. For most aerospace applications, the electrical conductivity of the fluid is low and the induced magnetic field is negligible as compared to the applied magnetic field. This allows the MHD effects to be modeled by introducing source terms into the gas dynamic equations. The operating temperature range for a typical scramjet engine is of the order of 3000 K. At these high temperatures, air does not obey the perfect gas law and composition of the air changes due to chemical reactions occurring at finite rate. The new algorithm has been extended to compute equilibrium and nonequilibrium flows in MHD channels. The electrical conductivity of the weakly ionized flow is improved using a seed substance. Turbulence has been included by modifying the Baldwin-Lomax turbulence model to account for MHD effects. The new algorithm has been successfully incorporated into NASA's parabolized Navier-Stokes (UPS) code. The algorithm is used to compute 3-D supersonic viscous flow in an experimental MHD channel currently in operation at NASA Ames Research Center.
Book Synopsis Energy Dynamics and Current Sheet Structure in Fluid and Kinetic Simulations of Decaying Magnetohydrodynamic Turbulence by :
Download or read book Energy Dynamics and Current Sheet Structure in Fluid and Kinetic Simulations of Decaying Magnetohydrodynamic Turbulence written by and published by . This book was released on 2015 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Numerical Simulations of Magnetohydrodynamic Flow and Heat Transfer by : Amar KC
Download or read book Numerical Simulations of Magnetohydrodynamic Flow and Heat Transfer written by Amar KC and published by . This book was released on 2014 with total page 90 pages. Available in PDF, EPUB and Kindle. Book excerpt: Magnetohydrodynamic (MHD) natural convection in a porous medium with low-magnetic Reynolds number (Re[subscript m]) is investigated in a rectangular cavity with isothermal walls on the left and right and adiabatic walls on the top and bottom. The validity of Darcy's law is addressed for high-Rayleigh number (Ra) flows with high permeability, where the velocity-pressure gradient relationship transitions from linear (i.e. the Darcy law) to nonlinear, due to the fact that the form drag due to solid obstacles is now comparable with the surface drag due to friction, which in turn results in the Darcy-Forchheimer law. In addition, the effect of different magnetic field strengths in terms of Hartmann numbers (Ha) is also investigated for cavities for varying aspect ratios to analyze how the flow and thermal characteristics in a porous medium are influenced by the applied magnetic field. Here, the interaction between the fluid velocity and the electromagnetic forces gives rise to different flow scenarios. In particular, the influence of magnetic field under the varying conditions of convective currents (through Ra) and length scales (through aspect ratios) on quantities such as stream function, temperature and Nusselt number, Nu is studied. Assessment of three regularization-based models and two eddy-viscosity-based subgrid-scale (SGS) turbulence models for large eddy simulations (LES) are carried out for MHD decaying homogeneous turbulence (DHT) and MHD transition to turbulence for the Taylor-Green vortex (TGV) through comparisons to direct numerical simulations (DNS). Simulations are conducted using the low-magnetic Reynolds number approximation (Re[subscript m] “ 1) and the initially-isotropic turbulence problem has a Taylor scale Reynolds number (Re[subscript lambda]) of 120. LES predictions using the Leray-[alpha], LANS-[alpha], and Clark-[alpha] regularization-based SGS models are compared to the classic non-dynamic Smagorinsky and the dynamic Smagorinsky models. Regarding the regularization models, this work represents their first application to MHD decaying turbulence or transition-to-turbulence problems. Analyses of turbulent kinetic energy decay rates, energy spectra, and vorticity fields are made between the varying magnetic field cases. Overall, the regularization models did poorly compared to the eddy-viscosity models for all MHD cases, but the comparisons improved as the magnetic field increase in magnitude.
