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What Is The Simulation Of Transient Wind Effects On A Low-Rise Building?

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In this study, numerical CFD scheme with LES turbulence closure is used for appropriate simulation of transient wind effects on a low-rise building with a scale of 1:1 (full-scale dimension) to yield results comparable to the experimental wind pressure measurements and also full-scale field measured data with no scale issue. The so-called vortex method was employed to generate the inflow wind fluctuation at inlet. In addition, the influence of inflow boundary proximity for a low-rise building via LES is investigated to develop guidelines to reasonably simulate ABL wind characteristics and reproduce the peak pressures on roof areas.
Background
The performance of roofs in low-rise buildings can differ significantly during a windstorm …show more content…

The generated transient inflow should possess natural wind characteristics with both time (temporal) and space (spatial) correlations. In this study, in order to make certain that the developed CFD LES model of a low-rise building and the inlet wind velocity fluctuations are in accordance to real world ABL properties, the full scale benchmark data from the Wind Engineering Research Field Laboratory (WERFL) at Texas Tech University (TTU) are used as field measured wind pressure and velocity data. In addition, wind-tunnel measurement from NIST/UWO and open-jet testing at LSU are compared with CFD LES results. The effects of correlation of wind loading on the roof of low-rise buildings are investigated for each cases as well. In addition, the values of peak pressure coefficients are compared with external pressure coefficients, GCp, specified for components and cladding (C&C) in ASCE 7-10. In next sections, the details of technique used for generating the inflow velocity fluctuations in CFD LES are presented.
Inflow Velocity Fluctuation
As CFD techniques have been developed over the recent years, LES becomes one of the widely used turbulence closure to simulate turbulent flows of engineering interests. However, one of the main challenges in computational wind engineering and using CFD simulations via LES turbulence closure is generating appropriate inflow fluctuation at inlet that is representing the real-world ABL wind

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