HU Xiao-bing, YANG Yi. RESEARCH ON NSRFG-BASED LES SIMULATION FOR STANDARD WIND TERRAINS[J]. Engineering Mechanics, 2020, 37(9): 112-122. DOI: 10.6052/j.issn.1000-4750.2019.10.0601
Citation: HU Xiao-bing, YANG Yi. RESEARCH ON NSRFG-BASED LES SIMULATION FOR STANDARD WIND TERRAINS[J]. Engineering Mechanics, 2020, 37(9): 112-122. DOI: 10.6052/j.issn.1000-4750.2019.10.0601

RESEARCH ON NSRFG-BASED LES SIMULATION FOR STANDARD WIND TERRAINS

  • Accurately simulating inflow turbulence for large eddy simulation (LES) is a hot topic in the field of computational wind engineering. Defining appropriate inflow boundary conditions in accordance with the turbulence characteristics of various atmospheric boundary layers (ABLs) is a prerequisite and indeed a great challenge in numerical research of wind effects on building structures at current stage. Based on the newly proposed LES inflow turbulence generation technology-NSRFG method, which belongs to the category of the turbulence synthesis method, the appropriate values of several parameters in the mathematical model were systematically studied. Detailed parameter sensitivity analyses were conducted to investigate several key parameters, including the sampling frequency intervals Δƒ, the introduced time scale factor \tau _0 , the introduced spatial scale factor θ, the decay coefficient c_j and the tuning factor \gamma _j , on the simulated turbulent fluctuating wind velocity spectra, the RMS values as well as the spatial correlations. Based on it, a serials of model parameters corresponding to four typical standard wind terrains defined in Chinese building code were then proposed in order to build a ‘standard numerical wind terrain model’. Numerical simulations and equilibrium state verifications for those standard wind fields were subsequently performed. The results showed that key parameters had significant impacts on the numerical reconstructions of the turbulent wind fields by employing NSRFG method, and the proposed standard numerical wind terrain models would be referential for similar LES research of building structures.
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