Abstract
An important issue to ensure obtaining accurate large eddy simulation (LES) results is to generate a random flow field as an inflow boundary condition satisfying prescribed spatial correlations and turbulence characteristics. The theory calculation equation of turbulent kinetic energy and its dissipation rate were deduced based on the assumption of that the turbulence is under local equilibrium condition. The Improved Random Flow Generation (IRFG) technology was proposed to generate the inlet turbulent fluctuating wind field in LES simulation. This IRFG technology was validated by comparison with existing results, and was then adopted to generate the inlet turbulent boundary condition. Results show that the IRFG technology is able to generate fluctuating turbulent flow field satisfying prescribed spatial anisotropy, correlation conditions and power spectrum. The LES simulation based on the IRFG technology can accurately predict the mean/fluctuating wind pressure characteristics of the super-tall building. And the vortex separation, attachment and shedding phenomenon can be well simulated. The pressure distributions of the super-tall building are greatly influenced by surrounding buildings, such as building height and shape. Fluctuating pressure increases with increasing of vortex motion and then extreme pressure maybe appears in someplace, which requires sufficient attention in structural wind-resistant design.
Published Version
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