Different boundary conditions for LES solver Palm 6.0 used for ABL in tunnel experiment

H. Reznícek, J. Geletič, M. Bureš, P. Krč, J. Resler, Kateřina Vrbová, A. Trush, P. Michálek, L. Benes, M. Sühring
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引用次数: 1

Abstract

We tried to reproduce results measured in the wind tunnel experiment with a CFD simulation provided by numerical model PALM. A realistic buildings layout from the Prague-Dejvice quarter has been chosen as a testing domain because solid validation campaign for PALM simulation of Atmospheric Boundary Layer (ABL) over this quarter was documented in the past. The question of input data needed for such simulation and capability of the model to capture correctly the inlet profile and its turbulence structure provided by the wind-tunnel is discussed in the study. The PALM dynamical core contains a solver for the Navier-Stokes equations. By default, the model uses the Large Eddy Simulation (LES) approach in which the bulk of the turbulent motions is explicitly resolved. It is well validated tool for simulations of the complex air-flow within the real urban canopy and also within its reduced scale provided by wind tunnel experiments. However the computed flow field between the testing buildings did not correspond well to the measured wind velocity in some points. Different setting of the inlet boundary condition was tested but none of them gave completely developed turbulent flow generated by vortex generators and castellated barrier wall place at the entrance of the aerodynamic section of the wind tunnel.
用于隧道ABL实验的LES求解器Palm 6.0的不同边界条件
我们试图用数值模型PALM提供的CFD模拟再现风洞实验中测量到的结果。我们选择了布拉格-德杰斯区一个真实的建筑布局作为测试领域,因为过去在该地区记录了PALM模拟大气边界层(ABL)的可靠验证活动。研究中讨论了模拟所需的输入数据和模型正确捕获风洞提供的进气道廓形及其湍流结构的能力问题。PALM动力核心包含一个求解Navier-Stokes方程的求解器。默认情况下,该模型使用大涡模拟(LES)方法,其中大部分湍流运动被明确地解决。该方法是模拟真实城市冠层内复杂气流的有效工具,也是风洞实验提供的缩小尺度下复杂气流的有效工具。然而,计算得到的建筑物间流场与实测风速在某些点上并不吻合。试验了不同进气道边界条件的设置,但没有一种设置能使风洞气动截面入口处的涡发生器和伞形障壁所产生的湍流完全发育。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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