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对流项采用五阶线性耗散紧致格式(DCS5)离散,粘性项采用6阶中心紧致格式离散,时间项采用5级5阶龙格-库塔时间推进格式求解流体动力学方程组,并由此建立近声场的直接模拟方法。为了应用结构网格在复杂几何形状条件下对流场进行计算,发展了高精度的多块特征对接边界技术。完成了低速无粘振荡圆柱和粘性圆柱绕流等标准计算声学算例,获得了令人满意的结果。
The convection term is dispersed in the fifth order linear dissipative compact form (DCS5), the viscous term is discretized in the sixth order compact form, and the time term is solved using the fifth order Runge-Kutta time-lag format for the fluid dynamics equations Thus a direct simulation method of near-sound field is established. In order to calculate the flow field under the condition of complex geometry by using structured grid, multi-block feature docking technology with high precision has been developed. Accomplished the standard calculation of acoustic calculation, such as low speed non-stick oscillation cylinder and viscous cylinder flow, and achieved satisfactory results.