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首页> 外文期刊>International Journal of Heat and Mass Transfer >Wall-resolved large eddy simulation of turbulent mixed-convection heat transfer along a heated vertical flat plate
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Wall-resolved large eddy simulation of turbulent mixed-convection heat transfer along a heated vertical flat plate

机译：沿垂直加热平板湍流混合对流换热的壁解析大涡模拟

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摘要

The present study aims to assess the predictive capabilities of wall-resolved large eddy simulation (LES) in computing the fluid flow and heat transfer characteristics in a mixed-convection turbulent boundary layer that developed along a large flat plate vertically mounted in air. The maximum Rayleigh number was approximately 3 × 10~(11), which resulted in fully developed turbulence conditions. To enhance the accuracy, computational efficiency, and numerical stability, the LES solved the low-Mach number compressible flow governing equations, which included fluctuating density effects and pressure-density decoupling. For the subgrid scale (SGS) closure, a locally dynamic Smagorinsky SGS model was implemented into the LES solver to enable the backscatter phenomenon intrinsic to transitioning boundary layer flows. The LES illustrated exceptional agreement with the statistics profiles in the boundary layer obtained with the experiments of previous studies, which showed sensitivity to freestream conditions. In particular, the LES correctly predicted the turbulent heat flux in the streamwise direction near the heated surface. Furthermore, the LES captured the rapid changes in spectra of fluctuating temperature and velocities due to the delay of transition with increasing freestream velocity.
机译：本研究旨在评估壁解析大涡模拟（LES）在沿垂直安装在空气中的大平板形成的混合对流湍流边界层中计算流体流动和传热特性的预测能力。最大瑞利数约为3×10〜（11），这导致了充分发展的湍流条件。为了提高精度，计算效率和数值稳定性，LES解决了低马赫数可压缩流量控制方程，其中包括波动的密度效应和压力-密度解耦。对于亚网格规模（SGS）封闭，在LES解算器中实现了局部动态Smagorinsky SGS模型，以使过渡层边界流固有的反向散射现象成为可能。 LES说明了与先前研究的实验所获得的边界层统计资料格外的一致性，这表明对自由流条件的敏感性。特别是，LES正确地预测了靠近受热面的气流方向的湍流热通量。此外，LES捕获了由于随自由流速度增加而转变的延迟而引起的温度和速度波动谱的快速变化。

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