Based on the FLUENT software,the numerical simulation of the Fluid-Thermal-Structural of temperature fluctuation caused by parallel jet flows is carried out by using the large eddy simulation(LES). Firstly,the numerical results were in good agreement with the experimental ones,and the correctness of the simulation method is verified. Secondly,a special heat transfer phenomenon was observed. At the moment,when the temperature of the fluid is valley,the heat transfer from the wall to the fluid. The next moment,when temperature of the fluid is peak,the heat transfer from the fluid to wall,which forms the periodic Fluid-Thermal-Structural phenomenon. The amplitude of the temperature oscillations decreases nonlinearly with the increase of the solid thickness. However,the distribution of these frequencies is the same. With the increase of the inlet velocities,the dominant frequency of temperature fluctuation increases in the fluid and wall regions,when the inlet velocities are changed from 0.5 m/s to 1.5 m/s,the domain frequencies from 2 Hz up to 11 Hz.%本文基于FLUENT软件,采用大涡模拟(LES)方法对平行喷口冷热流体搅混产生的流固热耦合现象进行了数值模拟.首先将模拟值与实验值进行了对比,验证了模拟方法的正确性.其次,针对多种入口工况进行计算和分析,得出:某一时刻,流体温度处于波谷时,热量从固体传递给流体,下一时刻,当流体温度处于波峰时,热量则从流体传递给固体,故而形成了流固间周期性的热传递现象;随着固体厚度的增加,温度振荡的振幅呈非线性减小,但频率不变;随着入口速度的增加,流体和固体温度振荡的主频逐渐增大,当速度从0.5 m/s变化到1.5 m/s时,主频率可从2 Hz升高到11 Hz.
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