| 周志超,王波兰,赵润祥.预处理方法在低速弹箭流场计算中的应用[J].计算力学学报,2013,30(4):587~593 |
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| 预处理方法在低速弹箭流场计算中的应用 |
| The application of precondition method in calculations of flows around low-speed projectiles |
| 投稿时间：2012-03-06 修订日期：2012-06-05 |
| DOI：10.7511/jslx201304023 |
| 中文关键词: 预处理 并行 流场 气动特性 末敏弹 |
| 英文关键词:precondition parallel flow field aerodynamics terminal-sensitive ammunition(TSA) |
| 基金项目: |
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| 摘要点击次数: 2452 |
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| 中文摘要: |
| 基于Weiss-Smith预处理矩阵和全局截断预处理参数,采用有限体积方法对雷诺平均Navier-Stokes方程进行离散。对流项离散采用二阶线性重构和AUSM+-up格式,时间推进方法采用多重网格下的LU-SGS方法。结合MPI消息传递方法,建立了一套计算低速流动的并行数值方法。计算了低速椭球体的流场和气动力,压力系数和切应力系数计算结果与文献实验结果对比吻合度较好。生成了末敏弹的流场计算网格,对绕末敏弹流场进行了数值模拟。对多重网格下多进程的加速比和并行效率进行了测试,显示了程序良好的并行效率。计算的气动力结果与实验结果吻合。综合结果表明:本文的数值方法能够用于低速弹箭流场和气动力计算,为新型弹箭的设计和定型提供保证。 |
| 英文摘要: |
| Based on Weiss-Smith preconditioning matrix with global cut-off parameter, the full Reynolds-averaged Navier-Stokes equations are solved using the finite volume discretisation method. A second order linear method is used to interpolate the flow variables to the faces of the control volume. The convection flux then is discretisated by AUSM+-up scheme. The governing equations are integrated in time by the LU-SGS relaxation, which are accelerated by the multigrid method. Combined with MPI message passing method, a kind of numerical method of aerodynamic calculations of low speed flow is established. The flow field over the low-speed prolate spheroid and the aerodynamics of which are both calculated. The pressure and tangential stress coefficients are accordant to the experiment result in open literature. The meshes around the terminal-sensitive ammunition (TSA) are generated, and the flow field is numerical simulated. The speed-up ratio and the parallel efficiency are both tested, and the result is gratifying. The computational aerodynamic force accords with the experimental data. The comprehensive result shows, that the numerical method proposed is able to calculate the flow field and aerodynamic force of the low speed projectile, and guarantee the design of the aerodynamic figure of new projectiles. |
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