LES of turbulent boundary layer for inflow generation using stereo PIV measurement data

CFD has come to be used in the prediction of wind loads by the development of computer. Wind loads acting on buildings located in turbulent boundary layer are affected by the characteristic of approach flow strongly. Because inflow wind fluctuations affect the results of calculation with CFD, various kinds of methods to generate inflow wind fluctuations are suggested. On the other hand in wind tunnel experiment, PIV (Particle image velocimetry) technology has improved and been able to catch the high frequency turbulent fluctuations. We can acquire time–dependent–data of three-dimensional wind velocity components directly by stereo PIV. This report presents the result of LES calculation of turbulent boundary layer developed on flat floor for inflow generation using stereo PIV measurement results, and we discuss the applicability and the utility of this method. The simulated results show that the turbulent boundary layer is formed and reaches the equilibrium state at a relatively short distance from the starting point of computation. It can be thought that this method is useful for reproducing a turbulent boundary layer by LES.

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► We proposed a new method to generate turbulent inflow data using stereo PIV data.
► We executed LES of turbulent boundary layer on flat plate by this method.
► LES with this method can form turbulent boundary layer by relatively short fetch.
► Low frequency fluctuation of PIV inflow data is maintained in computational domain.
► High frequency fluctuation is generated by energy cascade and near-wall structure.