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首页> 外文期刊>Journal of Computational Physics >A 3-D multiband closure for radiation and neutron transfer moment models
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A 3-D multiband closure for radiation and neutron transfer moment models

机译：用于辐射和中子传递矩模型的3-D多频带闭合

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We derive a 3D multi-band moment model and its associated closure for radiation and neutron transfer. The new closure is analytical and nonlinear but very simple. Its derivation is based on the maximum entropy closure and assumes a Wien shape for the intensity when used in the Eddington tensor. In the multi-band approach, the opacity is re-arranged (binned) according to the opacity value. The multi-band model propagates identically all photonseutrons having the same opacity. This has been found to be a good approximation on average since the transport is mostly determined by the opacities and less by the frequencies. This same concept is used to derive the closure. We prove on two complex test atmospheres (the solar atmosphere and an artificial atmosphere) that the closure we have derived has good accuracy. All approximations made in deriving the model have been carefully numerically checked and quantified. Published by Elsevier Inc.
机译：我们推导了3D多频带矩模型及其与辐射和中子转移相关的闭合。新的闭合是解析的和非线性的，但非常简单。它的推导基于最大熵闭包，并且在爱丁顿张量中使用时，强度假定为维恩形状。在多波段方法中，将根据不透明度值重新安排（合并）不透明度。多频带模型可以完全传播具有相同不透明度的所有光子/中子。已经发现，平均而言，这是一个很好的近似值，因为传输主要由不透明度决定，而较少由频率决定。使用相同的概念来得出闭包。我们在两个复杂的测试气氛（太阳气氛和人造气氛）上证明，我们得出的封闭具有良好的精度。在推导模型中所做的所有近似值均经过仔细的数值检查和量化。由Elsevier Inc.发布

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