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Journal articles on the topic 'Buoyancy-driven MHD'

Author: Grafiati

Published: 6 September 2023

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1

DAVOUST, L., M. D. COWLEY, R. MOREAU, and R. BOLCATO. "Buoyancy-driven convection with a uniform magnetic field. Part 2. Experimental investigation." Journal of Fluid Mechanics 400 (December 10, 1999): 59–90. http://dx.doi.org/10.1017/s002211209900645x.

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In this paper, an experimental study of laminar magnetohydrodynamic (MHD) buoyancy-driven flow in a cylindrical cell with axis horizontal is described. A steady uniform magnetic field is applied vertically to the mercury-filled cell, which is also subjected to a horizontal temperature gradient. The main features of this internal MHD thermogravitational flow are made experimentally evident from temperature and electric potential measurements. Whatever the level of convection, raising the Hartmann number Ha to a value of the order of 10 is sufficient to stabilize an initially turbulent flow. At

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2

Hanasz, Michał, K. Otmianowska-Mazur, H. Lesch, et al. "Cosmic-ray driven dynamo in galactic disks." Proceedings of the International Astronomical Union 4, S259 (2008): 479–84. http://dx.doi.org/10.1017/s1743921309031147.

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AbstractWe present new developments on the Cosmic–Ray driven, galactic dynamo, modeled by means of direct, resistive CR–MHD simulations, performed with ZEUS and PIERNIK codes. The dynamo action, leading to the amplification of large–scale galactic magnetic fields on galactic rotation timescales, appears as a result of galactic differential rotation, buoyancy of the cosmic ray component and resistive dissipation of small–scale turbulent magnetic fields. Our new results include demonstration of the global–galactic dynamo action driven by Cosmic Rays supplied in supernova remnants. An essential o

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3

Davoust, L., R. Moreau, M. D. Cowley, P. A. Tanguy, and F. Bertrand. "Numerical and analytical modelling of the MHD buoyancy-driven flow in a Bridgman crystal growth configuration." Journal of Crystal Growth 180, no. 3-4 (1997): 422–32. http://dx.doi.org/10.1016/s0022-0248(97)00238-8.

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4

Prakash, J., S. Gouse Mohiddin, and S. Vijaya Kumar Varma. "Free Convective MHD Flow Past a Vertical Cone with Variable Heat and Mass Flux." Journal of Fluids 2013 (November 18, 2013): 1–8. http://dx.doi.org/10.1155/2013/405985.

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A numerical study of buoyancy-driven unsteady natural convection boundary layer flow past a vertical cone embedded in a non-Darcian isotropic porous regime with transverse magnetic field applied normal to the surface is considered. The heat and mass flux at the surface of the cone is modeled as a power law according to qwx=xm and qw*(x)=xm, respectively, where x denotes the coordinate along the slant face of the cone. Both Darcian drag and Forchheimer quadratic porous impedance are incorporated into the two-dimensional viscous flow model. The transient boundary layer equations are then nondime

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5

Wood, Charles E., and Chris J. Lawn. "Two-phase MHD energy conversion from buoyancy-driven flows of liquid metal coolant in a fusion reactor." Fusion Engineering and Design 151 (February 2020): 111288. http://dx.doi.org/10.1016/j.fusengdes.2019.111288.

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6

Liu, Zhipeng, Chaowei Jiang, Xueshang Feng, Pingbing Zuo, and Yi Wang. "Numerical Simulation of Solar Magnetic Flux Emergence Using the AMR–CESE–MHD Code." Astrophysical Journal Supplement Series 264, no. 1 (2022): 13. http://dx.doi.org/10.3847/1538-4365/ac9d2b.

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Abstract Magnetic flux emergence from the solar interior to the atmosphere is believed to be a key process in the formation of solar active regions and driving solar eruptions. Due to the limited capabilities of observations, the flux emergence process is commonly studied using numerical simulations. In this paper, we develop a numerical model to simulate the emergence of a twisted magnetic flux tube from the convection zone to the corona, using the AMR–CESE–MHD code, which is based on the conservation-element solution-element method, with adaptive mesh refinement. The results of our simulatio

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Subhrajit Kanungo and Tumbanath Samantara. "Flow And Heat Transfer of Unsteady Two-Phase Boundary Layer Flow Past an Inclined Permeable Stretching Sheet with Electrification of Particles." CFD Letters 15, no. 5 (2023): 134–44. http://dx.doi.org/10.37934/cfdl.15.5.134144.

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In the present study, an analysis has been carried out for a particle laden boundary layer flow with existence of electrification of particles has been studied over an inclined permeable stretching sheet. In most of the MHD fluid flow problems, either the plate is externally supplied by the magnetic/electric field or the fluid is electrically conducting. In the present problem, neither the plate is electrified nor the fluid is electrically conducted, but due to the random motion of the particles, collision of particle-particle and particle–wall, the particles are electrified. This electric fie

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Gouse, Mohiddin, Anwar Bég, and Vijaya Varma. "Numerical study of free convective MHD flow past a vertical cone in non-Darcian porous media." Theoretical and Applied Mechanics 41, no. 2 (2014): 119–40. http://dx.doi.org/10.2298/tam1402119g.

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A numerical study of buoyancy-driven unsteady natural convection boundary layer flow past a vertical cone embedded in a non-Darcian isotropic porous regime with transverse magnetic field applied normal to the surface is considered. The heat and mass flux at the surface of the cone is modeled as a power-law according to qw(x) = xm and q*w (x) = xn respectively, where x denotes the coordinate along the slant face of the cone. Both Darcian drag and Forchheimer quadratic porous impedance are incorporated into the two-dimensional viscous flow model. The transient boundary layer equations are then n

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9

Suzuki, Takeru K., Yasuo Fukui, Kazufumi Torii, Mami Machida, Ryoji Matsumoto, and Kensuke Kakiuchi. "Investigating Magnetic Activity in the Galactic Centre by Global MHD Simulation." Proceedings of the International Astronomical Union 11, S322 (2016): 137–40. http://dx.doi.org/10.1017/s1743921316012461.

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AbstractBy performing a global magnetohydrodynamical (MHD) simulation for the Milky Way with an axisymmetric gravitational potential, we propose that spatially dependent amplification of magnetic fields possibly explains the observed noncircular motion of the gas in the Galactic centre (GC) region. The radial distribution of the rotation frequency in the bulge region is not monotonic in general. The amplification of the magnetic field is enhanced in regions with stronger differential rotation, because magnetorotational instability and field-line stretching are more effective. The strength of t

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10

Hanasz, M., D. Woltanski, and K. Kowalik. "Interstellar and intergalactic dynamos." Proceedings of the International Astronomical Union 8, S294 (2012): 225–36. http://dx.doi.org/10.1017/s1743921313002573.

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AbstractWe review recent developments of amplification models of galactic and intergalactic magnetic field. The most popular scenarios involve variety of physical mechanisms, including turbulence generation on a wide range of physical scales, effects of supernovae, buoyancy as well as the magnetorotational instability. Other models rely on galaxy interaction, which generate galactic and intergalactic magnetic fields during galaxy mergers. We present also global galactic-scale numerical models of the Cosmic Ray (CR) driven dynamo, which was originally proposed by Parker (1992). We conduct a ser

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11

Mliki, Bouchmel, Rached Miri, Ridha Djebali, and Mohamed A. Abbassi. "CuO–Water MHD Mixed Convection Analysis and Entropy Generation Minimization in Double-Lid–Driven U-Shaped Enclosure with Discrete Heating." Acta Mechanica et Automatica 17, no. 1 (2023): 112–23. http://dx.doi.org/10.2478/ama-2023-0013.

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Abstract The present study explores magnetic nanoliquid mixed convection in a double lid–driven U-shaped enclosure with discrete heating using the lattice Boltzmann method (LBM) numerical method. The nanoliquid thermal conductivity and viscosity are calculated using the Maxwell and Brinkman models respectively. Nanoliquid magnetohydrodynamics (MHD) and mixed convection are analyzed and entropy generation minimisation has been studied. The presented results for isotherms, stream isolines and entropy generation describe the interaction between the various physical phenomena inherent to the probl

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12

Otieno, Opiyo Richard, Alfred W. Manyonge, and Jacob K. Bitok. "Numerical computation of steady buoyancy driven MHD heat and mass transfer past an inclined infinite flat plate with sinusoidal surface boundary conditions." Applied Mathematical Sciences 11 (2017): 711–29. http://dx.doi.org/10.12988/ams.2017.7127.

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13

Ahmed, Sameh E., M. A. Mansour, and A. Mahdy. "MHD mixed convection in an inclined lid-driven cavity with opposing thermal buoyancy force: Effect of non-uniform heating on both side walls." Nuclear Engineering and Design 265 (December 2013): 938–48. http://dx.doi.org/10.1016/j.nucengdes.2013.06.023.

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14

Pal, Dulal, and Babulal Talukdar. "Influence of fluctuating thermal and mass diffusion on unsteady MHD buoyancy-driven convection past a vertical surface with chemical reaction and Soret effects." Communications in Nonlinear Science and Numerical Simulation 17, no. 4 (2012): 1597–614. http://dx.doi.org/10.1016/j.cnsns.2011.08.038.

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15

Mahdy, A., S. E. Ahmed, and M. A. Mansour. "Entropy generation for MHD natural convection in enclosure with a micropolar fluid saturated porous medium with Al2O3Cu water hybrid nanofluid." Nonlinear Analysis: Modelling and Control 26, no. 6 (2021): 1123–43. http://dx.doi.org/10.15388/namc.2021.26.24940.

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This contribution gives a numerical investigation of buoyancy-driven flow of natural convection heat transfer and entropy generation of non-Newtonian hybrid nanofluid (Al2O3-Cu) within an enclosure square porous cavity. Hybrid nanofluids represent a novel type of enhanced active fluids. During the current theoretical investigation, an actual available empirical data for both thermal conductivity and dynamic viscosity of hybrid nanofluids are applied directly. Numerical simulation have been implemented for solid nanoparticles, the volumetric concentration of which varies from 0.0% (i.e., pure f

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16

Makinde, O. D., N. Sandeep, T. M. Ajayi, and I. L. Animasaun. "Numerical Exploration of Heat Transfer and Lorentz Force Effects on the Flow of MHD Casson Fluid over an Upper Horizontal Surface of a Thermally Stratified Melting Surface of a Paraboloid of Revolution." International Journal of Nonlinear Sciences and Numerical Simulation 19, no. 2 (2018): 93–106. http://dx.doi.org/10.1515/ijnsns-2016-0087.

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AbstractConsidering the recent aspiration of experts dealing with the painting of aircraft and bonnet of cars to further understand the relevance of skin friction and heat transfer while painting all these objects that are neither horizontal nor vertical, neither a cone/wedge or cylinder but upper horizontal surface of a paraboloid of revolution; a two-dimensional electrically conducting Casson fluid flow on an upper horizontal thermally stratified surface of a paraboloid of revolution is analyzed. The influence of melting heat transfer and thermal stratification are properly accounted for by

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17

Pal, Dulal, and Hiranmoy Mondal. "Influence of Soret and Dufour on MHD buoyancy-driven heat and mass transfer over a stretching sheet in porous media with temperature-dependent viscosity." Nuclear Engineering and Design 256 (March 2013): 350–57. http://dx.doi.org/10.1016/j.nucengdes.2012.08.015.

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18

Nayak, M. K., F. Mabood, and O. D. Makinde. "Heat transfer and buoyancy‐driven convective MHD flow of nanofluids impinging over a thin needle moving in a parallel stream influenced by Prandtl number." Heat Transfer 49, no. 2 (2019): 655–72. http://dx.doi.org/10.1002/htj.21631.

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19

Parveen, Rujda, Tapas Ray Mahapatra, and B. C. Saha. "Study of Entropy Generation and Magnetohydrodynamic (MHD) Natural Convection in a Curved Enclosure Having Various Amplitude and Filled with Cu–TiO₂/Water Hybrid Nanofluid." Journal of Nanofluids 10, no. 3 (2021): 339–54. http://dx.doi.org/10.1166/jon.2021.1794.

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We have studied the buoyancy-driven convection enhancement and entropy production in a Cu–TiO2/water (water with copper and titanium dioxide nanoparticles) hybrid nanofluid filled curved enclosure subjected to a uniform magnetic field. The enclosure has a sinusoidally heated right wall, cold left wall, uniformly heated bottom wall, and thermally insulated upper curved wall. The effect of different amplitudes (concave, square, and convex) of the upper curved wall is considered. The non-linear governing equations are non-dimensionalized and written in stream function-velocity formulation. Bi Con

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20

Nazeer, Mubbashar, N. Ali, and Tariq Javed. "Numerical simulation of MHD flow of micropolar fluid inside a porous inclined cavity with uniform and non-uniform heated bottom wall." Canadian Journal of Physics 96, no. 6 (2018): 576–93. http://dx.doi.org/10.1139/cjp-2017-0639.

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Buoyancy-driven, incompressible, two-dimensional flow of a micropolar fluid inside an inclined porous cavity in the presence of magnetic field is investigated. The nonlinear partial differential equations are solved by employing a robust Galerkin finite element scheme. The pressure term in this scheme is eliminated by using the penalty method. The results are exhibited in the form of streamlines, isotherms, and local and average Nusselt numbers for two cases, namely, the constant and the sinusoidal heated lower wall of the conduit. In both cases, the side walls of the cavity are cold and the u

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21

Pipin, V. V., A. G. Kosovichev, and V. E. Tomin. "Effects of Emerging Bipolar Magnetic Regions in Mean-field Dynamo Model of Solar Cycles 23 and 24." Astrophysical Journal 949, no. 1 (2023): 7. http://dx.doi.org/10.3847/1538-4357/acaf69.

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Abstract We model the physical parameters of Solar Cycles 23 and 24 using a nonlinear dynamical mean-field dynamo model that includes the formation and evolution of bipolar magnetic regions (BMRs). The Parker-type dynamo model consists of a complete MHD system in the mean-field formulation: the 3D magnetic induction equation, and 2D momentum and energy equations in the anelastic approximation. The initialization of BMRs is modeled in the framework of Parker’s magnetic buoyancy instability. It defines the depths of BMR injections, which are typically located at the edge of the global dynamo wav

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22

Sarson, Graeme R., and David Gubbins. "Three-dimensional kinematic dynamos dominated by strong differential rotation." Journal of Fluid Mechanics 306 (January 10, 1996): 223–65. http://dx.doi.org/10.1017/s0022112096001292.

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In the kinematic dynamo problem a fluid motion is specified arbitrarily and the induction equation is solved for non-decaying magnetic fields; it forms part of the larger magnetohydrodynamic (MHD) dynamo problem in which the fluid flow is buoyancy-driven. Although somewhat restrictive, the kinematic problem is important for two reasons: first, it suffers from numerical difficulties that are holding up progress on the MHD problem; secondly, for the geodynamo, it is capable of reproducing details of the observable magnetic field. It is more efficient to study these two aspects for the kinematic

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23

Selimefendigil, Fatih, and Ali J. Chamkha. "MHD mixed convection of nanofluid in a three-dimensional vented cavity with surface corrugation and inner rotating cylinder." International Journal of Numerical Methods for Heat & Fluid Flow 30, no. 4 (2019): 1637–60. http://dx.doi.org/10.1108/hff-10-2018-0566.

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Purpose This study aims to numerically examine mixed convection of CuO-water nanofluid in a three-dimensional (3D) vented cavity with inlet and outlet ports under the influence of an inner rotating circular cylinder, homogeneous magnetic field and surface corrugation effects. In practical applications, it is possible to encounter some of the considered configurations in a vented cavity such as magnetic field, rotating cylinder and it is also possible to specially add some of the active and passive control means to control the convection inside the cavity such as adding nanoparticles, corrugati

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24

Laidoudi, Houssem, Aissa Abderrahmane, Abdulkafi Mohammed Saeed, et al. "Irreversibility Interpretation and MHD Mixed Convection of Hybrid Nanofluids in a 3D Heated Lid-Driven Chamber." Nanomaterials 12, no. 10 (2022): 1747. http://dx.doi.org/10.3390/nano12101747.

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This paper presents a numerical simulation of a magneto-convection flow in a 3D chamber. The room has a very specific permeability and a zigzag bottom wall. The fluid used in this study is Al2O3-Cu/water with 4% nanoparticles. The Galerkin finite element technique (GFEM) was developed to solve the main partial equations. The hybrid nanofluid inside the container is subjected to the horizontal motion of the upper wall, an external magnetic field, and a thermal buoyancy force. The present numerical methodology is validated by previous data. The goal of this investigation was to understand and de

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25

Vishniac, E. T. "The Internal Wave Driven Dynamo in Accretion Disks." Symposium - International Astronomical Union 157 (1993): 211–15. http://dx.doi.org/10.1017/s0074180900174145.

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We present the results of recent work on a model of angular momentum transport in thin, ionized, accretion disks. In particular, we consider three physical effects, each of which can be represented in terms of a local MHD mode in such a disk. First, we discuss the generation and propagation of internal modes within accretion disks, pointing out certain features which make them particularly promising as the driving force behind a strong, fast dynamo in accretion disks. Second, we point ou that the magnetic shearing instability (MSI) first discussed by Velikhov, and more recently by Balbus and H

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Sekar, R., and K. Raju. "Effect of magnetic field dependent viscosity on Soret-driven ferrothermohaline convection saturating an anisotropic porous medium of sparse particle suspension." World Journal of Engineering 11, no. 3 (2014): 213–28. http://dx.doi.org/10.1260/1708-5284.11.3.213.

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Thermoconvective instability with Soret effect in multi-component fluids has wide range of applications in heat and mass transfer. This work deals with the theoretical investigation of the effect of magnetic field dependent (MFD) viscosity on Soret-driven ferrothermohaline convection heated and salted from below in an anisotropic porous medium subjected to a transverse uniform magnetic field. The resulting eigen value problem is solved using Brinkman model. An exact solution is obtained for the case of two free boundaries and the stationary and oscillatory instabilities are investigated by usi

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Shree, Venkatesh Vidya, Chandrappa Rudresha, Chandrashekar Balaji, and Sokalingam Maruthamanikandan. "Effect of Magnetic Field Dependent Viscosity on Darcy-Brinkman Ferroconvection with Second Sound." East European Journal of Physics, no. 4 (December 6, 2022): 112–17. http://dx.doi.org/10.26565/2312-4334-2022-4-10.

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The problem of buoyancy-driven convection in a ferromagnetic fluid saturated porous medium with the Maxwell-Cattaneo law and MFD viscosity is investigated by the method of small perturbation. The fluid motion is described using the Brinkman model. It is assumed that the fluid and solid matrices are in local thermal equilibrium. For simplified boundary conditions, the eigenvalue problem is solved exactly, and closed form solutions for stationary instability are obtained. Magnetic forces and second sound were found to enhance the beginning of Brinkman ferroconvection. However, ferroconvection is

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28

Jin, Yan, Xiaosen Dong, Fu Yang, Changgui Cheng, Yang Li, and Wei Wang. "Removal Mechanism of Microscale Non-Metallic Inclusions in a Tundish with Multi-Hole-Double-Baffles." Metals 8, no. 8 (2018): 611. http://dx.doi.org/10.3390/met8080611.

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To effectively remove microscale inclusions in the tundish, the Multi-Hole-Double-Baffles (MHDB), a novel flow control device in the tundish for continuous casting, was developed. The hole array mode of the MHDB will directly affect the trajectories of the inclusions. The effect and removal mechanism of the inclusions with sizes of 1 µm to 50 μm in the tundish with MHDB were studied by numerical simulation. The hole array mode of MHDB could affect the inclusions’ trajectories and distribution, and the mechanism underlying the effect of the MHDB was investigated using the discrete phase model (

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Keller Jr., Douglas, Yonatan Givon, Romain Pennel, Shira Raveh-Rubin, and Philippe Drobinski. "Untangling the mistral and seasonal atmospheric forcing driving deep convection in the Gulf of Lion: 2012–2013." Ocean Science 18, no. 2 (2022): 483–510. http://dx.doi.org/10.5194/os-18-483-2022.

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Abstract. Deep convection in the Gulf of Lion is believed to be primarily driven by the mistral winds. However, our findings show that the seasonal atmospheric change provides roughly two-thirds of the buoyancy loss required for deep convection to occur for the year 2012 to 2013, with the mistral supplying the final third. Two NEMOMED12 ocean simulations of the Mediterranean Sea were run from 1 August 2012 to 31 July 2013, forced with two sets of atmospheric-forcing data from a RegIPSL coupled run within the Med-CORDEX framework. One set of atmospheric-forcing data was left unmodified, while t

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30

"Buoyancy-driven MHD flow in electrically insulated rectangular ducts." Magnetohydrodynamics 43, no. 3 (2007): 315–22. http://dx.doi.org/10.22364/mhd.43.3.3.

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Gürbüz, Merve, and Münevver Tezer-Sezgin. "Numerical Solution of MHD Incompressible Convection Flow in Channels." European Journal of Computational Mechanics, December 18, 2019. http://dx.doi.org/10.13052/ejcm2642-2085.2852.

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The purpose of this paper is to study numerically the influence of the magnetic field, buoyancy force and viscous dissipation on the convective flow and temperature of the fluid in a square cavity, lid-driven cavity, and lid-driven cavity with an obstacle at the center. The continuity, momentum and energy equations are coupled including buoyancy and magnetic forces, and energy equation contains Joule heating and viscous dissipation. The equations are solved in terms of stream function, vorticity and temperature by using polynomial radial basis function (RBF) approximation for the inhomogeneity

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32

Tayebi, Tahar, and Ali J. Chamkha. "MHD buoyancy‐driven flow in a nanoliquid filled‐square enclosure divided by a solid conductive wall." Mathematical Methods in the Applied Sciences, June 14, 2020. http://dx.doi.org/10.1002/mma.6598.

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33

"MHD Free Convective Heat Transfer in a Triangular Enclosure Filled with Copper-Water Nanofluid." International Journal of Material and Mathematical Sciences, April 29, 2020, 29–38. http://dx.doi.org/10.34104/ijmms.020.029038.

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Two-dimensional time-independent free convective flow and temperature flow into a right-angled triangle shape cavity charged by Cu-H2O nanofluid has been performed. The horizontal side of the enclosure is warmed uniformly T=Th whilst the standing wall is cooled at low-temperature T=Tc and hypotenuse of the triangular is insulated. The dimensionless non-linear governing PDEs have been solved numerically employing the robust PDE solver the Galerkin weighted residual finite element technique. An excellent agreement is founded between the previous, and present studies. The outcomes are displayed t

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F. Baiyeri, J., M. A. Mohammed, O. A. Esan, T. O. Ogunbayo, and O. E. Enobabor. "Ohmic Dissipative MHD Pressure-driven Coupled-flow and Heat Transfer Across a Porous Medium with Thermal Radiation." Journal of Energy Research and Reviews, July 17, 2018, 1–10. http://dx.doi.org/10.9734/jenrr/2018/v1i29800.

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In this study, a pressure driven flow of a magnetohydrodynamic steady coupled-flow across a porous layer horizontal bottom plate with buoyancy force is investigated. The heat transfer problem is also examined by taking viscous and Ohmic dissipation and radiation effects in the energy equation into consideration. The velocity and temperature slip boundary conditions are taken at the plate and at the interface of the porous medium and clear fluid, it is assumed that velocity components to be continuous and the jump in shearing stresses. The solutions to the problem are obtained by employing four

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Singh, Jitendra Kumar, and S. Vishwanath. "Hall and induced magnetic field effects on MHD buoyancy-driven flow of Walters’B fluid over a magnetised convectively heated inclined surface." International Journal of Ambient Energy, April 8, 2021, 1–10. http://dx.doi.org/10.1080/01430750.2021.1909652.

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36

Ahmed, Sameh E., and Anas A. M. Arafa. "3D MHD dusty nanofluid flow within cubic heterogeneous porous enclosures with hot and cold cylinders using non-homogeneous nanofluid model." Proceedings of the Institution of Mechanical Engineers, Part E: Journal of Process Mechanical Engineering, July 25, 2022, 095440892211152. http://dx.doi.org/10.1177/09544089221115271.

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The heterogeneity of the porous medium properties is an important topic due to the important wide practical applications in the reservoir rocks and the petroleum reservoirs. This study aims to examine both the heterogeneity of the permeability, thermal conductivity and the nanofluid model on the dusty nanofluid within a three-dimensional cubic container. The convective transport is due to the buoyancy–driven flow resulting from two inner hot/cold cylinders separated by variable distance [Formula: see text]. The nanofluids are simulated by a non-homogeneous two phase model and the impact of a c

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"Chaos in geophysical fluids I. General introduction." Philosophical Transactions of the Royal Society of London. Series A: Physical and Engineering Sciences 348, no. 1688 (1994): 431–43. http://dx.doi.org/10.1098/rsta.1994.0102.

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Irregular buoyancy-driven flows occur in the atmospheres and fluid interiors of the Earth and other planets, and of the Sun and other stars, where they influence and often control the transfer of heat. Their presence is manifest in or implied by a wide variety of observed phenomena, including external magnetic fields generated by self-exciting magnetohydrodynamic (MHD ) dynamo action. Based on the laws of classical mechanics, thermodynamics and, in the case of electrically conducting fluids, electrodynamics, the governing mathematical equations are well known, but they are generally intractabl

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Tharakkal, Devika, Anvar Shukurov, Frederick A. Gent, Graeme R. Sarson, Andrew P. Snodin, and Luiz Felippe S. Rodrigues. "Steady states of the Parker instability." Monthly Notices of the Royal Astronomical Society, August 31, 2023. http://dx.doi.org/10.1093/mnras/stad2610.

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Abstract We study the linear properties, nonlinear saturation and a steady, strongly nonlinear state of the Parker instability in galaxies. We consider magnetic buoyancy and its consequences with and without cosmic rays. Cosmic rays are described using the fluid approximation with anisotropic, non-Fickian diffusion. To avoid unphysical constraints on the instability (such as boundary conditions often used to specify an unstable background state), nonideal MHD equations are solved for deviations from a background state representing an unstable magnetohydrostatic equilibrium. We consider isother

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Selimefendigil, Fatih, and Ali J. Chamkha. "Magnetohydrodynamics Mixed Convection in a Lid-Driven Cavity Having a Corrugated Bottom Wall and Filled With a Non-Newtonian Power-Law Fluid Under the Influence of an Inclined Magnetic Field." Journal of Thermal Science and Engineering Applications 8, no. 2 (2016). http://dx.doi.org/10.1115/1.4032760.

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In this study, the problem of magnetohydrodynamics (MHD) mixed convection of lid-driven cavity with a triangular-wave shaped corrugated bottom wall filled with a non-Newtonian power-law fluid is numerically studied. The bottom corrugated wall of the cavity is heated and the top moving wall is kept at a constant lower temperature while the vertical walls of the enclosure are considered to be adiabatic. The governing equations are solved by the Galerkin weighted residual finite element formulation. The influence of the Richardson number (between 0.01 and 100), Hartmann number (between 0 and 50),

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Foglizzo, Thierry, Rémi Kazeroni, Jérôme Guilet, et al. "The Explosion Mechanism of Core-Collapse Supernovae: Progress in Supernova Theory and Experiments." Publications of the Astronomical Society of Australia 32 (2015). http://dx.doi.org/10.1017/pasa.2015.9.

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AbstractThe explosion of core-collapse supernova depends on a sequence of events taking place in less than a second in a region of a few hundred kilometers at the centre of a supergiant star, after the stellar core approaches the Chandrasekhar mass and collapses into a proto-neutron star, and before a shock wave is launched across the stellar envelope. Theoretical efforts to understand stellar death focus on the mechanism which transforms the collapse into an explosion. Progress in understanding this mechanism is reviewed with particular attention to its asymmetric character. We highlight a se

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Prince, Hasib Ahmed, Md Mehrab Hossen Siam, Amit Ghosh, and Mohammad Arif Hasan Mamun. "Application of Artificial Intelligence on Predicting the Effects of Buoyancy Ratio on MHD Double-Diffusive Mixed Convection and Entropy Generation in Different Nanofluids and Hybrid-Nanofluids." Journal of Thermal Science and Engineering Applications, May 23, 2023, 1–28. http://dx.doi.org/10.1115/1.4062613.

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Abstract The present computational investigation aims to investigate the effect of varied buoyancy ratio on mixed convection and entropy formation in a lid-driven trapezoidal enclosure under magnetic field with two rotating cylinders. The effects of SWCNT-water, Cu-water, and Al2O3-water nanofluids individually, as well as effects of three different types of SWCNT-Cu-Al2O3-water hybrid nanofluids are examined. The governing Navier-Stokes, thermal energy, and mass conservation equations are solved using the Galerkin weighted residual finite element method to obtain results as average Nusselt nu

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Anee, Meratun Junnut, Sadia Siddiqa, Md Farhad Hasan, and Md Mamun Molla. "Lattice Boltzmann simulation of natural convection of ethylene glycol-alumina nanofluid in a C-shaped enclosure with MFD viscosity through a parallel computing platform and quantitative parametric assessment." Physica Scripta, July 12, 2023. http://dx.doi.org/10.1088/1402-4896/ace704.

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Abstract The multiple-relaxation-time (MRT) lattice Boltzmann method (LBM) was considered in this study to numerically analyse the effects of magnetic field dependent (MFD) viscosity on the natural convection of ethylene glycol (C$_2$H$_6$O$_2$)-alumina (Al$_2$O$_3$) nanofluid in a side heated two-dimensional C-shaped enclosure using graphics processing unit (GPU) by a computing unified device architecture (CUDA) C parallel computing platform. Numerical simulations were performed at multifarious Rayleigh numbers, Hartmann numbers, and the different magnetic field inclination angles to study th

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