S0502-4-5 大規模主流擾乱影響下にある2次元尾根地形背後での後流特性([S0502-4]噴流,後流および剥離流れ現象の解明と制御(4))

概要

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We examined wake characteristics behind a 2-dimensioanl hill under the influence of overlying large-scale freestream disturbance. This flow field corresponds to the near-neutral atmospheric surface layer over a complex terrain. We used the active grid technique to generate the freestream disturbance, which mimics meso-scale disturbances in the planetary boundary layer. We carried out the 2-dimensional velocity measurements with a dynamic PIV system, and accumulate the turbulence statistics below the logarithmic layer height. Through the comparison of the statistics with those for experirhents without large-scale disturbances, we revealed that the fluctuating velocities are mainly generated by the local wind shear, and turbulence statistics have a similarity regardless of the addition in the disturbance.
一般社団法人日本機械学会の論文
2010-09-04