Efficient algorithms for constraining orientation tensors in Galerkin methods for the Fokker-Planck equation
Efficient algorithms for constraining orientation tensors in Galerkin methods for the Fokker-Planck equation
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Fokker-Planck 方程 Galerkin 方法中约束方向张量的高效算法
DOI:
10.1016/j.camwa.2016.01.012
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发表时间:
2016
期刊:
影响因子:
--
通讯作者:
C. Lohmann
中科院分区:
文献类型:
--
作者:
C. Lohmann
This paper deals with the problem of positivity preservation in numerical algorithms for simulating fiber suspension flows. In contrast to fiber orientation models based on the Advani–Tucker evolution equations for even-order orientation tensors, the probability distribution function of fiber orientation is approximated using the Galerkin discretization of the Fokker–Planck equation with Fourier basis functions or spherical harmonics. This procedure leads to a natural generalization of orientation tensor models replacingad hocclosure approximations by Galerkin equations for the fine-scale components. After introducing an operator splitting approach to solving the discretized Fokker–Planck equation, we present conditions and correction techniques that guarantee physically correct distribution functions. As the reader will see, the derivation of these conditions is independent of the space dimension and their applicability is not limited to the simulation of fiber suspensions.
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影响因子:
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发表时间:
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期刊:
影响因子:
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