摘要
采用精度高和稳定性强的隐式高阶紧致差分格式结合Beam Warming近似因式分解法求解全N S方程,对二维、粘性、非定常、可压双微射流作动器合成流场进行数值模拟。内置牛顿似子迭代用来消除因近似因式分解、线性化、显式边界条件及隐式一边采用低阶空间离散所带来的误差。与其它人工粘性方法相比,隐式高阶数值过滤方法对许多情况,特别是对于马赫数非常低的流场计算有明显优越性。计算结果揭示了双微射流合成流场的特点及其产生、发展与耗散的过程。此外,双微射流合成流场的形成受双微射流作动器相位差的影响,合成射流偏向相位超前的一方。相位差愈大,偏转愈剧烈。
The full NS equations were solved using BeamWarming approximate factorization method and a highorder compactdifference scheme for the synthetic flow field of adjacent microjet actuators that is compressible, two dimensional, timedependent, as well as viscous. Newtonlike subiterations within each physical time step were employed to achieve temporal accuracy , remove factorization errors and reduce errors caused by linearization and the low spatial order of accuracy of the implicit operator. The implicit highorder compactdifference was observed to be very robust for problems considered. The algorithm was demonstrated to be highly accurate compared to both secondorder and upwindbiased methods. For several cases , particularly very lowMach number flows, filtering is determined to be a superior alternative to damping. The result shows character as well as creating, developing and dissipation process of the adjacent microjests. The adjacent synthetic microjet flow field is affected by phasedifference of tow actuators. When phasedifference exits, the synthetic flow field is vectoring to the actuator which is phase lead. The larger the phasedifference is, the larger the vectoring is.
出处
《空气动力学学报》
CSCD
北大核心
2003年第3期267-274,共8页
Acta Aerodynamica Sinica
基金
西北工业大学博士创新基金资助项目(5211102 0800 6114101).
关键词
双微射流作动器
合成流场
数值模拟
近似因式分解
adjacent microjets
synthetic flow field
Navier-Stockes equations
approximate-factorization solution
numerical simulation.
