Study on the abnormity of the axial-symmetric boundary in simulation of shock-induced combustion

LIU Chen; WANG Jiang-feng; WU Yi-zhao

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Study on the abnormity of the axial-symmetric boundary in simulation of shock-induced combustion

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- Study on the abnormity of the axial-symmetric boundary in simulation of shock-induced combustion
- Vol. 24, Issue 6, (2009)
- 作者机构：
  
  南京航空航天大学航空宇航学院,南京,210016
- 作者简介：
- 基金信息：
- DOI：
  CLC：
- Published：2009
- 稿件说明：
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LIU Chen, WANG Jiang-feng, WU Yi-zhao. Study on the abnormity of the axial-symmetric boundary in simulation of shock-induced combustion[J]. 2009, 24(6).
DOI：

LIU Chen, WANG Jiang-feng, WU Yi-zhao. Study on the abnormity of the axial-symmetric boundary in simulation of shock-induced combustion[J]. 2009, 24(6). DOI：

摘要

对钝体激波诱导燃烧模拟中引起对称轴附近出现数值异常现象的几个影响因素进行了细致讨论.在飞行速度低于爆轰速度情形的模拟中

在一定条件下靠近对称轴的位置会出现明显的数值异常——燃烧阵面扭曲.分别从边界处理方法、计算格式、化学反应机制和计算网格等4个方面对该异常产生的原因进行了详细地讨论.研究表明4个因素都会导致数值异常产生

深入的分析表明计算格式是其中最根本的因素

而这种燃烧阵面扭曲的数值异常应该与粉刺问题(Carbuncle)类似.针对如何克服轴对称边界数值异常提出了一些合理的措施

并给出了验证算例的对比与分析.

Abstract

The abnormity of the axial-symmetric boundary in simulation of shock-induced combustion was discussed.Practice has shown that the abnormity(distortion of combustion front) may appear near the axis when the velocity was below the detonative speed.Four key factors

such as the solution method of the boundary

numerical scheme

chemical reaction model and mesh were analyzed.It is shown that all factors can cause the abnormity

but the numerical scheme should be the most fundamental one.The abnormity may be similar to the‘carbuncle' problem.Some reasonable measures are proposed

and numerical results show the availability of these proposals.

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