Explicit time integration of transient eddy current problems

Explicit time integration of transient eddy current problems
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瞬态涡流问题的显式时间积分

DOI:
10.1002/jnm.2227
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发表时间:
2018
期刊:
International Journal of Numerical Modelling: Electronic Networks
影响因子:
--
通讯作者:
G. Wimmer
G. Wimmer
中科院分区:
--
文献类型:
--
作者:
J. S. Dutiné;M. Clemens;S. Schöps;G. Wimmer

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对于瞬态涡流问题的时间积分,通常使用隐式时间积分方法,其中由于涉及铁磁材料,每次都必须使用牛顿拉夫逊方法对步骤1或几个非线性方程组进行线性化。本文将广义 Schur 补集应用于磁矢量势公式,将指数为 1 的微分代数方程组转换为刚度降低的常微分方程组。对于该常微分方程方程组的时间积分,应用显式欧拉方法。显式时间积分方法的 Courant-Friedrich-Levy 稳定性准则可能会导致较小的时间步长。每个时间步都需要在问题的非导电区域应用离散卷曲-卷曲算子的伪逆。对于伪逆的计算,使用预条件共轭梯度法。提出了级联子空间外推方法来为这些预条件共轭梯度迭代产生合适的起始向量。使用非线性 TEAM 10 基准问题验证所得方案。
For time integration of transient eddy current problems, commonly implicit time integration methods are used, where in every time, step 1 or several nonlinear systems of equations have to be linearized with the Newton‐Raphson method because of ferromagnetic materials involved. In this paper, a generalized Schur complement is applied to the magnetic vector potential formulation, which converts a differential‐algebraic equation system of index 1 into a system of ordinary differential equations with reduced stiffness. For the time integration of this ordinary differential equations system of equations, the explicit Euler method is applied. The Courant‐Friedrich‐Levy stability criterion of explicit time integration methods may result in small time steps. Applying a pseudoinverse of the discrete curl‐curl operator in nonconducting regions of the problem is required in every time step. For the computation of the pseudoinverse, the preconditioned conjugate gradient method is used. The cascaded subspace extrapolation method is presented to produce suitable start vectors for these preconditioned conjugate gradient iterations. The resulting scheme is validated using the nonlinear TEAM 10 benchmark problem.
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