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arXiv 2204.03425math.NAcs.NA
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变速场的完全通量格式:对流-扩散方程与速度场的泊松方程的耦合

Complete flux scheme for variable velocity fields: coupling between the advection-diffusion equation and the Poisson equation for the velocity field

Hanz Martin Cheng, Jan ten Thije Boonkkamp

摘要:

在这项工作中,我们考虑了平流-扩散方程,耦合到速度场的泊松方程。这种类型的耦合通常在等离子体物理或多孔介质流动模型中遇到。这项工作的目的是建立在完整的通量计划(通过考虑源项的贡献对Scharfetter-Gummel计划的改进),使其二阶收敛,这是均匀的Péclet数,结转到这些模型。这是通过考虑速度场的分段线性逼近来完成的,然后将其用于定义迎风调整的Péclet数。

英文摘要:

In this work, we consider an advection-diffusion equation, coupled to a Poisson equation for the velocity field. This type of coupling is typically encountered in models arising from plasma physics or porous media flow. The aim of this work is to build upon the complete flux scheme (an improvement over the Scharfetter-Gummel scheme by considering the contribution of the source term), so that its second-order convergence, which is uniform in Péclet numbers, carries over to these models. This is done by considering a piecewise linear approximation of the velocity field, which is then used for defining upwind-adjusted Péclet numbers.

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