【摘要】 本文通过对撞击射流流场的实例计算,比较了K-∈和ASM湍流模型及PLDS和QUICK差分格式;计算表明:在各向异性表现较强烈的流场中,用ASM湍流模型比用K-∈湍流模型要好;在方程呈现椭圆型类型的问题计算中,QUICK是一种可以推荐的差分格式。更多还原

【Abstract】 Most of flows are belong to the turbulence in the fluid installations and in nature. Constituting a suitable tuibulent model is the only way to describe the closed differential equations of mean-flow-field, and constructing a effective numerical method is the key link to obtain numerical solutions which embody tuibulent model. K-e model often used in engineering is actually postulated isotropy of the turbulent transportation. The results obtained by using K-e model is not good suited to the experimental results. For example: strong-swirling flow, great-curvature flow and gravitational flow, etc. As a try, Differential-Stress model and Algebraic-Stress model have been prosposed. On the basis of these models, some success results have been obtained. To the lack of inadequate precision about the center and up-wind differential schemes, PLDS and QUICK numerical schemes are proposed in recent years. These numerical schemes can reduce the numerical diffusion.Two turbulent models (K-∈ & ASM) ana two difference schemes (PLDS & QUICK) have been compared in the paper. The calculating results present that ASM turbulent model is better than K-e turbulent model in a strong anisotropic field, and, QUICK is the better difference schemes in calculating elliptical problems.更多还原