453697017 发表于 2012-2-14 15:28

关于三阶迎风格式



各位大侠，在fluent中迎风格式这一栏中有这样一种迎风格式third-order MUSCL这种迎风格式适用于哪些场合？
有什么特点！谢谢~！

dengdengwo5 发表于 2012-2-17 16:54

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chaobo1982 发表于 2012-2-18 09:03

帮助里面这样说的：
This third-order convection scheme was conceived from the original MUSCL (Monotone
Upstream-Centered Schemes for Conservation Laws) by blending a central di erencing
scheme and second-order upwind scheme .
Unlike the QUICK scheme which is applicable to structured hex meshes only, the MUSCL
scheme is applicable to arbitrary meshes. Compared to the second-order upwind scheme,
the third-order MUSCL has a potential to improve spatial accuracy for all types of meshes
by reducing numerical diffusion, most significantly for complex three-dimensional flows,
and it is available for all transport equations.
The third-order MUSCL currently implemented in FLUENT does not contain any flux-limiter. As a result, it can produce undershoot and overshoot when the flow-field under consideration has discontinuities such as shock waves.

453697017 发表于 2012-2-18 12:18

虽然看的不是很明白！还是谢谢！

liulonggui 发表于 2012-2-24 10:12

MUSCL格式可以应用在任何网格和复杂的3维流计算，相比second-order upwind，third-order MUSCL 可以通过减少数值耗散而提高空间精度，并且对所有的传输方程都适用。third-order MUSCL 目前在FLUENT中没有流态限制，可以计算诸如冲击波类的非连续流场。

453697017 发表于 2012-2-24 14:18

恩！楼上的正解，谢谢！
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