混合式粒子碼之建立與應用; The development and application of hybrid particle model

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Title:	混合式粒子碼之建立與應用;The development and application of hybrid particle model
Authors:	許至德;Chih-Te Hsu
Contributors:	太空科學研究所
Keywords:	電漿模擬;plasma simulation
Date:	2011-07-13
Issue Date:	2012-01-05 14:10:55 (UTC+8)
Abstract:	太空電漿為磁化且無碰撞的，電漿壓力或溫度會呈現非均向性，而導致不穩定性的產生。當電漿條件滿足P//≧P⊥+B2/μ0，會產生救火管不穩定。本文發展適合應用於模擬其不穩定性之二維電漿混合式粒子碼，所利用之演算法為Current Advance Method and Cyclic Leapfrog，其將正離子看成粒子、電子看成流體。此演算法之特點為利用“動量法”之概念來實作，優點為在保持模擬正確性的同時，可以節省電腦計算時間。模擬的結果顯示，二維模擬中發生不穩定性後，磁場會繞磁場初始方向旋轉，且具有沿模擬平面傳播之波動。此外模擬平面上可看見發展出相當明顯的正離子渦流。 The space plasma is magnetized and collisionless. As a result, the plasma pressure or temperature can become anisotropic with P//≠P⊥. The fire-hose instability occurs when the threshold condition of P//≧P⊥+B2/μ0 is met. The purpose of this thesis is to develop a two-dimensional hybrid simulation code that can be applied to simulate the fire-hose instability. The numerical method used here is the modified CAM-CL (Current Advance Method and Cyclic Leapfrog) scheme in which ions are treated kinetically as particles and electrons are treated as a fluid. The feature of CAM-CL is to use the momentum method, which takes the advantages of having accurate field evolution and saving computational time. The simulation results show that during the evolution process, the magnetic field rotates, and the wave propagates on the simulation plane. It is found that ion turbulence may develop in the two-dimensional fire-hose instability.
Appears in Collections:	[Graduate Institute of Space Science] Department of Earth Sciences

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