高精度边界格式的研究

STUDY ON HIGH ACCURACY BOUNDARY ALGORITHMS

摘要: 利用有精确解的Ｒｉｎｇｌｅｂ流动，构造了对流场数值解精度进行检验的“Ｒｉｎｇｌｅｂ机器”．重点讨论了边界格式对流场数值解的影响及高精度边界格式的建立．计算表明，在场内应用二阶精度格式情况下，采用二阶精度的边界格式所得到的流场解精度将大大高于采用一阶边界格式所得到的精度．为提高流场解的精度，不仅需要高精度的边界格式，还必须注意边界格式与场内格式的匹配．计算还表明，采用特征线修正的方法能有效地提高边界处理的精度
- 精度 /
- 边界格式 /
- Ringleb流动 /
- 格式匹配 /
- 特征线修正
Abstract: Based on the Ringleb Flow, for which there exists analytical solution, a numerical tool named Ringleb Machine is developed to test the accuracy of algorithms of CFD. The affection that boundary procession exerts on the solution of the field is discussed. Result of our calculation shows that:1) Accompanying with a 2nd order field algorithm, a 2nd order boundary algorithm can lead to much more accurate solution than a 1st order one.2) To raise the accuracy of the solution,it's not enough to simply use a highe...
- accuracy /
- boundary algorithm /
- Ringleb Flow /
- algorithm matching /
- characteristic correction

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