Identification of the heat transfer frequency response in pulsating laminar and subcritical flow across a cylinder
Identification of the heat transfer frequency response in pulsating laminar and subcritical flow across a cylinder
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DOI：
10.1088/1742-6596/745/3/032055
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发表时间：
2016-09
期刊：
影响因子：
--
通讯作者：
A. Witte;A. Cabrera;W. Polifke
中科院分区：
文献类型：
--
作者：
A. Witte;A. Cabrera;W. Polifke
圆柱体在横流中的稳态换热是热流体力学的一个典型问题。然而，在许多应用中，例如Rijke管，流量可能会波动。本文将数值模拟与系统辨识相结合，对这一现象进行了分析。分别采用直接层流数值模拟和雷诺数为3900的亚临界流动大涡模拟。模拟中的入口速度波动在很大的频率范围内被激发。对非定常放热和速度时间序列进行后处理，辨识出可表示为传递函数的动态模型。它们准确地描述了动态行为，可以用于进一步的建模。
The steady-state heat transfer from a cylinder in cross-flow is a prototype problem in thermo-fluiddynamics. However, in many applications such as the Rijke tube, the flow may fluctuate. This work analyses the phenomenon combining numerical simulation with system identification. Direct numerical simulation of laminar flow and Large Eddy Simulation at subcritical flow at Reynolds number equal to 3900 are used, respectively. Fluctuations of the inlet velocity in the simulation are excited over a wide range of frequencies. Time series of unsteady heat release and velocity are post-processed to identify dynamic models, which may be represented as transfer functions. They accurately describe the dynamic behavior and can be used for further modeling.