Turbulence Modelling Effects on Tandem Cylinder Interaction Flow and Analysis of Installation Effects on Broadband Noise Using Chimera Technique
Turbulence Modelling Effects on Tandem Cylinder Interaction Flow and Analysis of Installation Effects on Broadband Noise Using Chimera Technique
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DOI：
10.2514/6.2012-3033
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发表时间：
2012-06
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影响因子：
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通讯作者：
Björn Greschner;Dandy Eschricht;C. Mockett;F. Thiele
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文献类型：
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作者：
Björn Greschner;Dandy Eschricht;C. Mockett;F. Thiele
本文采用延迟分离涡模拟（DDES）和改进的延迟分离涡模拟（IDDES）对NASA串列圆柱体（L/D = 3.7）进行了数值研究。低马赫数为0.1285，雷诺数设定为166.000，以匹配NASA兰利研究中心的相应实验（Jenkins等人，Lockard等人）。不可压缩模拟是在EC ATAAC项目的强制性网格上进行的，大约有。9.5百万个细胞，展向范围为3.0D，低正常结构域范围约为100万个细胞。17.8D，具有对称边界条件，以模拟封闭的实验测试段。在第二步中，进行可压缩IDDES模拟以评估配置的宽带噪声。测量可从QFF开放式射流设施获得。为了捕捉装置的效果，使用了上述圆柱形核心网格和单流喷射网格的组合网格。网格之间的通信是通过重叠嵌合体技术完成的。用标准的FW-H方法计算了远场噪声。IDDES方法的目的是扩展LES区域的原始DES方法（混合RANS/LES）从Spalart等。（1997）的湍流边界层，如由Travin et.在2006年。因此，非纬向混合发生在边界层内部，RANS模型充当LES的壁面模型。仿真结果的比较表明，使用IDDES的结果的改善。
The NASA tandem cylinder benchmark case (L/D = 3.7) is studied numerically using novel variants of DES the Delayed Detached Eddy Simulation (DDES) and the Improved Delayed Deteched Eddy Simulation (IDDES). The ow Mach number is 0.1285 and the Reynolds number is set to 166.000 to match th corresponding experiments at the NASA Langley Research Center (Jenkins et al., Lockard et al.). Incompressible simulations are carried out on a mandatory grid from the EC ATAAC project with approx. 9.5 million cells with a spanwise extent of 3.0D and ow normal domain extent of approx. 17.8D with symmetry boundary condition to mimic the closed experimental test section. In a second step a compressible IDDES simulation is done to evaluate the broadband noise of the con guration. Measurements are available from the QFF open jet facility. To capture the installation e ects a combined grid of above mentioned cylinder core grid and a single stream jet grid is used. The communication between the grids is done by an overset chimera technique. The noise in the far eld is calculated by a standard FW-H method. The IDDES approach is designed to extend the LES region of the original DES approach (hybrid RANS/LES) from Spalart et. al. (1997) to the turbulent boundary layer, as proposed rst by Travin et. al. in 2006. The non-zonal blending occures therefore inside the boundary layer the RANS model acts as a wall model for the LES. The comparison of the simulations show the improvement of the results by using a IDDES.