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Bezier surfaces and finite elements for MED simulations

机译:用于MED模拟的Bezier曲面和有限元

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A finite element method based on bicubic Bezier surfaces is applied to the simulation of MHD instabilities relevant to magnetically confused fusion. The major advantage of the new technique is that it allows a natural way to implement mesh refinement strategy. which is not supported by a pure Hermite formulation. Compared to a Lagrangian formulation the number of degrees of freedom is significantly reduced. The use of an isoparametric representation of the space coordinates allows an accurate alignment of the finite elements to the magnetic field line geometry in a tokamak plasma. The Bezier finite elements have been implemented in a MHD code using the non-linear reduced MHD model in toroidal geometry. As an illustration, results for Soloviev equilibrium and time-dependent current-hole computations are presented and discussed. (C) 2008 Elsevier Inc. All rights reserved.
机译:基于双三次贝塞尔曲面的有限元方法被用于模拟与磁融合有关的MHD不稳定性。新技术的主要优点在于,它允许自然的方式来实现网格细化策略。纯Hermite配方无法提供支持。与拉格朗日公式相比,自由度明显减少。空间坐标的等参表示的使用允许将有限元与托卡马克等离子体中的磁场线几何形状精确对准。 Bezier有限元已使用环形几何中的非线性简化MHD模型以MHD代码实现。作为说明,将介绍和讨论Soloviev平衡和与时间有关的电流-孔计算的结果。 (C)2008 Elsevier Inc.保留所有权利。

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