CAJ | 학술논문

利用Von Karman型自相关函数建立了随机介质模型,对自相关长度、谱指数两个参量分别讨论了模型的特征,分析了不同扰动标准差下模型中速度的分布和变化情况.结果显示:改变自相关长度及横纵向谱指数,都可以产生横向和纵向上非均匀体尺度改变的随机介质模型;扰动标准差不同,得到的随机扰动的范围就不同,从而引起模型中速度围绕背景速度上下波动.从模拟结果图显示,随机介质模型能灵活地描述实际介质.
이용Von Karman형자상관함수건립료수궤개질모형,대자상관장도、보지수량개삼량분별토론료모형적특정,분석료불동우동표준차하모형중속도적분포화변화정황.결과현시:개변자상관장도급횡종향보지수,도가이산생횡향화종향상비균균체척도개변적수궤개질모형;우동표준차불동,득도적수궤우동적범위취불동,종이인기모형중속도위요배경속도상하파동.종모의결과도현시,수궤개질모형능령활지묘술실제개질.
This paper constructed random media models using the Von Karman type autocorrelation function, discussed the model characteristics by two model parameters of autocorrelation length and spectrum exponent and analyzed the distribution and variation of velocities in the models under the conditions of different variances. The results show that the variations of random media models of heterogeneity scales in lateral and longitudinal directions are all produced by changing autocorrelation length and lateral and longitudinal spectrum exponent. The disturbance range of the random perturbation is different if the disturbance variance is different, and such a difference results in fluctuation of velocities in models around the background velocity. The modeling figures demonstrate that random medium models can vividly describe real media.