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首页> 外文会议>Indoor Air 2005 >COMPARISON OF LARGE EDDY SIMULATION PREDICTIONS WITH PARTICLE IMAGE VELOCIMETRY DATA FOR THE AIRFLOW IN A GENERIC CABIN MODEL
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COMPARISON OF LARGE EDDY SIMULATION PREDICTIONS WITH PARTICLE IMAGE VELOCIMETRY DATA FOR THE AIRFLOW IN A GENERIC CABIN MODEL

机译：通用客舱模型中大涡模拟预测与颗粒流测速数据的比较

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摘要

In this paper, a comparison of the computational fluid dynamics (CFD) predictions applying large eddy simulation (LES) on the airflow in a generic cabin model with the experimental particle image velocimetry (PIV) data is reported. A brief summary of the test set-up and the experimental data are described. The main focus of this study is to analyze the temporal variation of the experimental data. The time series of the PIV-measured velocity components with sampling frequencies of 0.1 and 5 Hz were compared with the CFD predictions, sampling at 20 Hz. Energy spectral analysis through fast Fourier transformation (FFT) on the PIV data and their CFD counterparts was performed and presented in this study. By using direct comparisons of the velocity data, good agreement on the range of the velocity components were obtained and hence, the validation of the LES predictions at all the monitoring locations. A similar conclusion can be reached for the results of the energy spectral analysis. The energy-spectrum function calculated from the LES predicted velocity magnitudes have excellent correlation with the Kolmogorov spectrum law in the universal equilibrium range. For the smaller wave numbers, the PIV data taken at 0.1 Hz clearly reveal the characteristic motion of the largest eddy in the flow domain and it correlates very well with the CFD predictions.
机译：在本文中，报告了使用通用涡流模拟（LES）对通用机舱模型中的气流应用计算涡流动力学（CFD）预测与实验粒子图像测速（PIV）数据的比较。简要介绍了测试设置和实验数据。这项研究的主要重点是分析实验数据的时间变化。将PIV测量的速度分量的时间序列（采样频率为0.1和5 Hz）与CFD预测进行比较，以20 Hz采样。通过对PIV数据及其CFD对应物进行快速傅里叶变换（FFT）进行能谱分析，并在本研究中进行了介绍。通过使用速度数据的直接比较，在速度分量的范围上获得了很好的一致性，因此，在所有监视位置对LES预测的验证都是正确的。对于能量谱分析的结果可以得出类似的结论。由LES预测的速度大小计算出的能谱函数在普遍平衡范围内与Kolmogorov谱定律具有极好的相关性。对于较小的波数，以0.1 Hz采集的PIV数据清楚地揭示了流域中最大涡流的特征运动，并且与CFD预测非常相关。

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