回转体绕流场数值计算分析

Numerical Analysis on Ambient Flow of Axisymmetric Body

  • 摘要: 采用有限体积方法求解三维低速N—S方程,研究了三维回转对称体的绕流。用中心差分和迎风差分的混合差分格式构造代数方程组,采用了隐式和显式相结合的方法使主对角元素占优,以提高迭代求解过程的稳定性。利用压力校正算法,采用面松弛迭代来实现方程的求解。湍流的计算采用了标准的双方程模型。给出了回转体的计算结果,与其它方法的计算结果的对比表明它们之间具有合理的一致性。

     

    Abstract: The three-dimensional steady Reynolds-averaged N-S equations were solved numerically by a finite volume method and applied to study the flow around three-dimensional axisymmetric body. The finite volume equations were formulated in strong conservative form on a general, non-orthogonal grid system. The mixed differencing scheme was used to form the differencing equations. Only a part of the convection flux and diffusion terms were treated implicitly to improve the stability of the iterative solution procedure.Numerical predictions of the turbulence were obtained with the κ-ε model. The resulting equations were solved by pressure correction allgorithm. The calculation results are presented in this report and compared with experimental data.

     

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