Chemical fuel magnetohydrodynamics power generation 化学燃料磁流体发电
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Process of radiation magnetohydrodynamics in al wire - array z - pinch 箍缩的辐射磁流体动力学过程
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Magnetohydrodynamics power generation 磁铃发电
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Petrov - galerkin least squares mixed element method for the stationary incompressible magnetohydrodynamics 最小二乘混合元方法
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Many planets ( for example , ganymede , mercury , the earth , jupiter and saturn ) and stars ( for example , the sun ) possess intrinsic magnetic fields . the explanation for their existence and variation remains a great challenge to planetary scientists and astrophysicists . this article attempts to review some recent developments and difficulties in the study of magnetohydrodynamics for the electrically conducting fluid interiors of planets and stars . it is the fluid motions , usually driven by thermal convection , that generate and sustain magnetic fields through magnetohydrodynamic processes in planets and stars . in planets , the magnetohydrodynamic processes are strongly affected by the combined and inseparable effects of rotation , magnetic fields and spherical geometry . the key dynamics involves the interaction between the coriolis and lorentz forces . in the sun , it is the solar tachocline , a thin shear flow layer located at the base of the convection envelope , that plays an essential role in the solar magnetohydrodynamic processes which produce the 11 - year sunspot cycle . some results of a new nonlinear three - dimensional solar dynamo model are also presented 许多行星(如木卫三,水星,地球,木星和土星)和恒星(如太阳)具有内部磁场.对这些磁场的存在和变化的解释对行星科学家和天体物理学家是一个巨大的挑战.本文试图总结行星和恒星的导电流体内部磁流体力学研究的新近发展和困难.一般由热对流驱动的流动通过磁流体力学过程产生并维持在行星和恒星中的磁场.在行星中磁流体力学过程强烈地受到转动,磁场和球几何位型的综合影响.其动力学的关键方面涉及科里奥利力和洛伦兹力间的相互作用.在太阳中其流线,即处于对流层的薄的剪切流层在太阳的磁流体力学过程中扮演了一个基本的角色,并由之产生了11年的太阳黑子周期.本文也给出了一个新的非线性三维太阳发电机模型
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In recent years , plentiful and substantial fruits achieved by the lb method in simulations of hydraulics , multiphase flows , flows in porous media and heat transfer as well as magnetohydrodynamics , have revealed a broad perspective of application of this method , it will become a powerful competitor to the conventional approaches . in order to absorb the recent achievement in theory and application of the lb method , explore new ways in hydraulic computation to promote the development of practice , some work is car ried out in this thesis , as following : advances in the theory research and application , deductive process of the d2q9 model and some other commonly used models of the lb method are summarized . based on the hydrodynamic and general boundary conditions , a new joint boundary condition is presented , it integrates advantage of the two conditions above and obtains very good results in dealing with all kinds of boundaries of flow fields 为了消化和吸收近年来lb方法在理论和应用方面的新成果，探索在水力计算方面的新途径以促进lb方法实用化的发展，本文进行了下列研究工作：综述了lb方法在理论研究和实际应用方面的新进展，以及d2q9模型的推导过程和其他一些常用的模型；在水动力边界条件和通用边界条件的基础上提出了一种新的联合边界条件方法，它综合了上述两种边界条件的优点，在流场的各种边界处理中取得了非常好的效果，经过模块化的处理以后这种边界条件具有更好的实用性；针对均匀网格的lb方法计算效率较低的不足，提出了双重网格的latticeboltzmann方法，通过二维poiseulle流动、后台阶流动和渠道方槽流动三个算例的模拟，证明这种方法能够明显地提高流场模拟的计算效率；此外，根据复杂区域流场的特征提出了latticeboltzmann方法的分块-耦合算法，利用lb方法的计算特性实现块与块之间的数据交换，充分利用计算资源提高计算效率，通过对“ t ”型、 “十”型和“ x ”型分岔管道流场的模拟，展示了这种算法的特征和优点，以及它所具有的应用前景。
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Theoretical researches on solar activity , solar flare and cme were involved in many fields of foundational physics such as plasma astrophysics , magnetohydrodynamics ( mhd ) and so on . the forecast of solar activity , a main branch of space weather , was becoming more and more significant for preventing space disaster and for many aspects of space science 探索太阳活动的规律、太阳耀斑及其伴随cme的先兆、触发过程及能量传播机制等等，从理论上推动了等离子体天体物理、磁流体力学等诸多基础理论的发展，有着重要的理论意义；而对太阳活动的预报，是国际前沿科学?空间天气学的重要组成部分，对避免空间灾害、为航空航天科学提供服务等方面，具有重大的实际应用价值。
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The hyperbolic conservation laws with relaxation appear in many physical systems such as nonequilibrium gas dynamics , flood flow with friction , magnetohydrodynamics , etc . firstly , the thesis proves that there exists a unique global smooth solution for the cauthy problem to the hyperbolic conservation laws system with relaxation ; secondly , in the large time station , the thesis proves that the global smooth solutions of the hyperbolic conservation laws system with relaxation converge to rarefaction waves solution at a determined l ( p > 2 ) decay rate 带松弛项的双曲型守恒律组出现在诸多的物理系统中。例如，非平衡态的气体动力学、带摩擦的水流、磁动力学等。本文首先证明，带松弛项的双曲型守恒律组的柯西问题的整体光滑解的存在唯一性；其二，证明了带松弛项的双曲型守恒律组的解与相应的平衡态守恒律的稀疏波解在大时间状态下的l ~ p衰减率。
