高精度边界格式的研究  

STUDY ON HIGH ACCURACY BOUNDARY ALGORITHMS

作　　者：陈海[1] 昕鄂秦 李凤蔚[1] 

机构地区：[1]西北工业大学第三研究室

出　　处：《力学学报》1996年第4期392-399,共8页Chinese Journal of Theoretical and Applied Mechanics

基　　金：教委博士点基金

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。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 higher order boundary algorithm. Some work must be done to Match the boundary algorithm with the field algorithem. 3) Using Characteristic correction at boundaries can effectively raise the accuracy of boundaryprocession.

关 键 词：精度 边界格式 格式匹配 流场数值解 

分 类 号：V211.3[航空宇航科学与技术—航空宇航推进理论与工程]