Maximum grid spacing effect on peak pressure computation using inflow turbulence generators
Maximum grid spacing effect on peak pressure computation using inflow turbulence generators
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DOI：
10.1016/j.rineng.2022.100491
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发表时间：
2022-09-01
影响因子：
5
通讯作者：
Chowdhury, Arindam Gan
中科院分区：
文献类型：
--
作者：
Mansouri, Zahra;Selvam, Rathinam Panneer;Chowdhury, Arindam Gan
利用计算流体动力学（CFD）和合成的流入湍流发生器计算峰值压力，并与1:6比例的德克萨斯理工大学（TTU）风洞测量结果进行比较。采用一致离散随机流生成法（CDRFG）计算入流湍流度。如果不考虑CFD模型中使用的最大网格间距，将现场或实验测量的最大和最小频率输入到流入湍流发生器中，会导致高压误差。其中有一种情况，峰值压力结果误差超过100%。此外，在没有建筑物的建筑物位置观察到虚假压力。通过系统地改变每个计算网格尺寸的最大频率，并比较入流处的速度和压力与没有建筑物的建筑物位置，解释了误差的可能原因。从调查结果来看，建议入流湍流发生器中使用的最大频率不要超过最大栅格间距可输送的频率。
The peak pressures are computed using computational fluid dynamics (CFD) with the synthetic inflow turbulence generator and compared with 1:6 scale Texas Tech University (TTU) wind tunnel measurements. The inflow turbulence is calculated using the Consistent Discrete Random Flow Generation Method (CDRFG) method. The maximum and minimum frequencies from the field or experimental measurements as input to the inflow turbulence generator without considering the largest grid spacing used in the CFD model leads to high pressure error. For one case, more than 100% error in peak pressure results is observed. In addition, spurious pressures are observed at the building location without building. By varying maximum frequencies systematically for each computational mesh size and comparing the velocities and pressures at the inflow and the building location without building, possible causes of the error are explained. From the investigation, it is suggested not to use the maximum frequency in the inflow turbulence generator beyond the frequency that can be transported by the largest grid spacing.