论文:2012,Vol:30,Issue(5):784-788
引用本文:
郭东, 徐敏, 陈士橹. 基于网格速度法的非定常流场模拟和动导数计算[J]. 西北工业大学
Guo Dong, Xu Min, Chen Shilu. An Effective Computation Method Based on Field Velocity Approach for Unsteady Flow Simulation and Obtaining Dynamic Derivatives[J]. Northwestern polytechnical university

基于网格速度法的非定常流场模拟和动导数计算
郭东, 徐敏, 陈士橹
西北工业大学 航天学院, 陕西 西安 710072
摘要:
基于网格速度法的思想,将迎角的突变和俯仰角速率的突变叠加起来,发展了一套在固定网格上模拟飞行器俯仰振荡非定常流场的方法,该方法不需要实时更新网格,减少了计算时间和所需内存,避免了负体积的出现。首先计算了NACA 0006的阵风响应和NACA 0012翼型的俯仰振荡,所得结果与实验值和动网格方法符合较好,这表明该方法能够准确模拟此类非定常问题;最后将该方法应用于国外动导数计算标模Basic Finner Missile(BFM)俯仰振荡运动的数值模拟,并计算了其在马赫数1.58~2.5的静、动稳定性导数,计算结果与风洞实验值基本吻合,体现了该方法的正确性。
关键词:    计算流体力学    非定常流场    网格速度法    动导数   
An Effective Computation Method Based on Field Velocity Approach for Unsteady Flow Simulation and Obtaining Dynamic Derivatives
Guo Dong, Xu Min, Chen Shilu
College of Astronautics,Northwestern Polytechical University,Xi'an 710072,China
Abstract:
Sections 1 through 3 of the full paper explain and evaluate the computation method mentioned in the ti-tle, which we believe is effective.Their core consists of: the field velocity or grid velocity approach provides a u-nique methodology for directly calculating aerodynamic responses to step change in flow conditions; the grid timemetrics include the velocity caused by the impulsive change in angle of attack but the mesh is not moved according-ly; this approach avoids numerical instabilities and decouples the step change in the angle of attack from a pitchrate; based on this approach, a technique is presented to model longitudinal unsteady flow phenomenon by superpo-sing the step change in the angle of attack upon the impulsive change in pitch rate.In Figs.4 and 5, numerical re-sults are validated by comparison with experimental results for NACA 0012 airfoil under forced oscillations.To vali-date further the applicability for the present method, pitch damping derivatives, calculated from the load history ofthe unsteady flow around a standard research configuration, known as the Basic Finner Missile, are presented inFigs.10 and 11.Predicted results show indeed good agreement with available wind tunnel data.
Key words:    computational fluid dynamics    computer simulation    numerical methods    stability    unsteady flow;field velocity    dynamic derivatives   
收稿日期: 2011-11-12     修回日期:
DOI:
基金项目: 国家自然科学基金重大研究计划(90816008);教育部博士点基金(20070699054)资助
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作者简介: 郭东(1986-),西北工业大学博士研究生,主要从事弹性飞行器飞行动力学与气动弹性力学研究。
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