Large-eddy simulations (LES) of temperature fluctuations in a mixing tee with/without a porous medium

Large-eddy simulations (LES) of temperature fluctuations in a mixing tee with/without a porous medium
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带/不带多孔介质的混合三通中温度波动的大涡模拟 (LES)

DOI:
10.1016/j.ijheatmasstransfer.2010.07.001
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发表时间:
2010-10
影响因子:
5.2
通讯作者:
Li, H.
Li, H.
中科院分区:
工程技术2区
文献类型:
--
作者:
Lu, T.;Jiang, P. X.;Guo, Z. J.;Zhang, Y. W.;Li, H.

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采用带浮力的Smagorinsky-Lilly (SL)亚网格尺度(SGS)湍流模型,在FLUENT中模拟了有和无多孔介质时混合管柱内的温度波动。采用归一化平均温度和波动温度来描述时间平均温度和时间平均温度波动强度。对于无多孔介质的三通结,预测的归一化平均温度和温度波动与以往的实验数据比较好。将数值结果与实验数据和不含多孔介质的数值数据进行比较,结果表明多孔介质显著降低了温度波动。此外,对三通接头温度波动最大位置的温度波动和功率谱密度(PSD)的分析表明,多孔介质显著降低了热疲劳效应,可用于各种结构,如三通接头、弯头、管道系统。
Temperature fluctuations in a mixing tee were simulated with and without a porous media in FLUENT using the LES turbulent flow model with the sub-grid scale (SGS) Smagorinsky–Lilly (SL) model with buoyancy. The normalized mean and fluctuating temperatures are used to describe the time-averaged temperatures and the time-averaged temperature fluctuation intensities. For the tee junction without the porous media, the predicted normalized mean temperature and temperature fluctuations compare well with previous experimental data. Comparison of the numerical results with the porous media with both experimental and numerical data without porous media shows that the porous media significantly reduces the temperature fluctuations. Moreover, analysis of the temperature fluctuations and the power spectrum densities (PSD) at the locations having the strongest temperature fluctuations in the tee junction shows that the porous media significantly reduces the thermal fatigue effects and can be useful in various structures such as tee junctions, elbows, piping systems.
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