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首页> 外文期刊>International Journal of Heat and Fluid Flow >DNS of heat transfer in transitional, accelerated boundary layer flow over a flat plate affected by free-stream fluctuations
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DNS of heat transfer in transitional, accelerated boundary layer flow over a flat plate affected by free-stream fluctuations

机译：受自由流波动影响的平板上过渡加速边界层流中的热传递DNS

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摘要

Direct numerical simulations (DNS) of flow over and heat transfer from a flat plate affected by free-stream fluctuations were performed. A contoured upper wall was employed to generate a favourable streamwise pressure gradient along a large portion of the flat plate. The free-stream fluctuations originated from a separate LES of isotropic turbulence in a box. In the laminar portions of the accelerating boundary layer flow the formation of streaks was observed to induce an increase in heat transfer by the exchange of hot fluid near the surface of the plate and cold fluid from the free-stream. In the regions where the streamwise pressure gradient was only mildly favourable, intermittent turbulent spots were detected which relaminarised downstream as the streamwise pressure gradient became stronger. The relaminarisation of the turbulent spots was reflected by a slight decrease in the friction coefficient, which converged to its laminar value in the region where the streamwise pressure gradient was strongest.
机译：对自由流波动影响的平板上的流动和传热进行了直接数值模拟（DNS）。轮廓化的上壁用于沿着平板的大部分产生有利的沿流方向的压力梯度。自由流起伏来自盒子中一个独立的各向同性湍流LES。在加速边界层流的层流部分中，观察到条纹的形成通过交换板表面附近的热流体和自由流中的冷流体进行交换，从而引起热量传递的增加。在仅适度有利于水流压力梯度的区域中，检测到间歇性湍流点，随着水流压力梯度变强，湍流点在下游重新分层。湍流点的再层化通过摩擦系数的略微下降反映出来，在流向压力梯度最强的区域收敛到其层流值。

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