M - magnetohydrodynamics 中文 - EN166

magnetohydrodynamics n.pl. 〔動詞用單數〕磁流體動力學。adj.-ic

magnetometer
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 帶松弛項的雙曲型守恒律組出現在諸多的物理系統中。例如，非平衡態的氣體動力學、帶摩擦的水流、磁動力學等。本文首先證明，帶松弛項的雙曲型守恒律組的柯西問題的整體光滑解的存在唯一性；其二，證明了帶松弛項的雙曲型守恒律組的解與相應的平衡態守恒律的稀疏波解在大時間狀態下的l ~ p衰減率。
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 探索太陽活動的規律、太陽耀斑及其伴隨cme的先兆、觸發過程及能量傳播機制等等，從理論上推動了等離子體天體物理、磁流體力學等諸多基礎理論的發展，有著重要的理論意義；而對太陽活動的預報，是國際前沿科學?空間天氣學的重要組成部分，對避免空間災害、為航空航天科學提供服務等方面，具有重大的實際應用價值。
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 為了消化和吸收近年來lb方法在理論和應用方面的新成果，探索在水力計算方面的新途徑以促進lb方法實用化的發展，本文進行了下列研究工作：綜述了lb方法在理論研究和實際應用方面的新進展，以及d2q9模型的推導過程和其他一些常用的模型；在水動力邊界條件和通用邊界條件的基礎上提出了一種新的聯合邊界條件方法，它綜合了上述兩種邊界條件的優點，在流場的各種邊界處理中取得了非常好的效果，經過模塊化的處理以后這種邊界條件具有更好的實用性；針對均勻網格的lb方法計算效率較低的不足，提出了雙重網格的latticeboltzmann方法，通過二維poiseulle流動、后臺階流動和渠道方槽流動三個算例的模擬，證明這種方法能夠明顯地提高流場模擬的計算效率；此外，根據復雜區域流場的特征提出了latticeboltzmann方法的分塊-耦合算法，利用lb方法的計算特性實現塊與塊之間的數據交換，充分利用計算資源提高計算效率，通過對“ t ”型、 “十”型和“ x ”型分岔管道流場的模擬，展示了這種算法的特征和優點，以及它所具有的應用前景。
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 許多行星(如木衛三,水星,地球,木星和土星)和恒星(如太陽)具有內部磁場.對這些磁場的存在和變化的解釋對行星科學家和天體物理學家是一個巨大的挑戰.本文試圖總結行星和恒星的導電流體內部磁流體力學研究的新近發展和困難.一般由熱對流驅動的流動通過磁流體力學過程產生并維持在行星和恒星中的磁場.在行星中磁流體力學過程強烈地受到轉動,磁場和球幾何位型的綜合影響.其動力學的關鍵方面涉及科里奧利力和洛倫茲力間的相互作用.在太陽中其流線,即處于對流層的薄的剪切流層在太陽的磁流體力學過程中扮演了一個基本的角色,并由之產生了11年的太陽黑子周期.本文也給出了一個新的非線性三維太陽發電機模型
Petrov - galerkin least squares mixed element method for the stationary incompressible magnetohydrodynamics 最小二乘混合元方法
Magnetohydrodynamics power generation 磁鈴發電
Process of radiation magnetohydrodynamics in al wire - array z - pinch 箍縮的輻射磁流體動力學過程
Chemical fuel magnetohydrodynamics power generation 化學燃料磁流體發電