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随着CFD技术的发展和计算机运算能力的提高,CFD在船舶设计中发挥着越来越重要的作用。目前CFD对于船舶阻力的计算基本集中在模型尺度,一方面因为实尺度缺乏相关的实验数据,导致缺乏对实尺度高雷诺数下近壁面湍流模型和壁面函数的探索;另一方面也是因为在实尺度计算中,非定常特征更加明显,数值计算的复杂性会大大增加,传统的RANS方法处理起来较为困难。该文应用基于OpenFOAM开发的船舶与海洋工程水动力求解器naoe-FOAMSJTU,应用改进的DES模型—IDDES,采用CFD方法同时对模型尺度和实尺度的32万吨VLCC进行阻力预报,并分别与RANS的计算结果、实验结果/三因次换算结果进行比较分析。在实尺度计算中考虑到表面粗糙度的影响,采用带粗糙度补贴的壁面函数进行近壁面处理。该文探讨了采用IDDES方法在船模和实船阻力预报中的可行性,同时也对实尺度和模型尺度下的流场进行了讨论与对比分析。  相似文献   
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串列双圆柱绕流的气动噪声特性分析   总被引:1,自引:0,他引:1  
在OpenFOAM求解器中采用改进型延迟分离涡模拟(improved delayed detached eddy simulation,IDDES)方法对串列双圆柱的绕流流场进行数值模拟,使用K FWH方程分析其气动噪声特性,比较不同来流速度、圆柱间距比和圆柱直径的双圆柱绕流的气动噪声特性。分析结果表明:来流速度、圆柱间距比和圆柱直径对串列双圆柱的气动噪声特性都有显著影响,在特定情况下还会出现冲击纯音噪声、高分贝噪声等声品质恶化现象。  相似文献   
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The combustion occurs at supersonic velocities in a scramjet engine. Since the mixing and combustion take place at high velocities, analyzing the mixing of air and fuel in the engine is of great interest for many researchers. In the present study, two passive struts are placed at a short distance downstream of the fuel injection strut. The effect of these passive struts in the mixing of air/fuel are assessed. Hybrid RANS/LES simulation is conducted using an improved delayed detached eddy simulation (IDDES) turbulence model. The single strut configuration is compared with the different strut configurations. The mixing efficiency is highly affected by the placement of the strut. The mixing performance is found to be superior in the strut configuration having high back-pressure. The modal analysis found the different modes that were responsible for the mixing enhancement at different sections of the combustor. The modes have high intensity when close to shock-shear layer interaction (SSLI), this suggests that SSLI are important for mixing enhancement. The broadband noise are observed in all the configurations due to large-scale mixing. Dynamic mode decomposition (DMD) reveals the modes responsible for the peak amplitude in the noise.  相似文献   
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