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Boundary-Layer Meteorology - Spectral proper orthogonal decomposition (SPOD) is applied as a post-processing technique to elucidate the relationship between turbulent motion and pollutant removal... 相似文献
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Boundary-Layer Meteorology - This study expands the study conducted by Zhang et al. (Boundary-Layer Meteorol, 2022, Vol. 183, 97–123) to elucidate turbulent structures within an ideal... 相似文献
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Studies on critical Reynolds number indices for wind-tunnel experiments on flow within urban areas 总被引：2，自引：2，他引：0
Reynolds-number dependence of flow fields within a modelled urban area was studied in a wind tunnel. We measured flow around a single model building and around model city blocks at various wind speeds, and studied Reynolds number indices more appropriate than the building Reynolds number. Our results led to the following conclusions. Firstly, the flow around the models in the wind tunnel was roughly divided into three parts according to the intensities of viscous stress and Reynolds stress as follows: (1) the flow in the vicinity of the ground or the surfaces of the model, where viscous stress became dominant under certain conditions; (2) the flow detached from the surfaces of the model, where Reynolds stress was always dominant; and (3) the flow around the separation bubble at the leading edge of the building model, where the influences of both viscous stress near the wall and the Reynolds stress in the separated boundary layer were mixed.Secondly, the critical Reynolds number of the flow in the modelled urban area could be defined by using both the roughness Reynolds number Rez0 (= z0u*/) and the dimensionless height z+ (= zu*/). Reynolds-number independence could be expected for whole flow fields in the modelled urban areas as long as the critical values of Rez0 and z+ were satisfied. 相似文献
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Ryozo Ooka Taiki Sato Kazuya Harayama Shuzo Murakami Yoichi Kawamoto 《Boundary-Layer Meteorology》2011,138(1):77-97
The summer climate around the Tokyo metropolitan area has been analysed on an urban scale, and the regional characteristics
of the thermal energy balance of a bayside business district in the centre of Tokyo (Otemachi) have been compared with an
inland residential district (Nerima), using a mesoscale meteorological model incorporating an urban canopy model. From the
results of the analysis, the mechanism of diurnal change in air temperature and absolute humidity in these areas is quantitatively
demonstrated, with a focus on the thermal energy balance. Moreover, effective countermeasures against urban heat-islands are
considered from the viewpoint of each region’s thermal energy balance characteristics. In addition to thermal energy outflux
by turbulent diffusion, advection by sea-breezes from Tokyo Bay discharges sensible heat in Otemachi. This mitigates temperature
increases during the day. On the other hand, because all sea-breezes must first cross the centre of Tokyo, it has less of
a cooling effect in Nerima. As a result, the air temperature during the day in Nerima is higher than that in Otemachi. 相似文献
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Habibie Muhammad Iqbal Noguchi Ryozo Shusuke Matsushita Ahamed Tofael 《GeoJournal》2021,86(2):777-807
GeoJournal - Maize is one of the potential crops can help in regional food production with self-sufficiency of foods in the drought prone areas of East Java in Indonesia. The purpose of this... 相似文献
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