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Large eddy simulation of blockage effects in the assessment of wind effects on tall buildings
Yang Gao,Ming Gu,Yong Quan,Chengdong Feng 한국풍공학회 2020 Wind and Structures, An International Journal (WAS Vol.30 No.6
The blockage effect on the aerodynamic characteristics of tall buildings is a fundamental issue in wind tunnel test but has rarely been addressed. To evaluate the blockage effects on the aerodynamic forces on a square tall building and flow field peripherally, large eddy simulations (LES) were performed on a 3D square cylinder with an aspect ratio of 6:1 under the uniform smooth inflow and turbulent atmospheric boundary layer (ABL) inflow generated by the narrowband synthesis random flow generator (NSRFG). First, a basic case at a blockage ratio (BR) of 0.8% was conducted to validate the adopted numerical methodology. Subsequently, simulations were systematically performed at 6 different BRs. The simulation results were compared in detail to illustrate the differences induced by the blockage, and the mechanism of the blockage effects under turbulent inflow was emphatically analysed. The results reveal that the pressure coefficients, the aerodynamic forces, and the Strouhal number increase monotonically with BRs. Additionally, the increase of BR leads to more coherence of the turbulent structures and the higher intensity of the vortices in the vicinity of the building. Moreover, the blockage effects on the aerodynamic forces and flow field are more significant under smooth inflow than those under turbulent inflow.
Hayat Faisal,Bai Yang,Iqbal Shahid,Ma Chengdong,Ali Muhammad Moaaz,Shahid Muhammad Adnan,Hasan Mahmood Ul,Mosa Walid F. A.,Khan Ummara,Xiao Huang,Gao Zhihong 한국원예학회 2023 Horticulture, Environment, and Biotechnology Vol.64 No.5
Indole-3-acetic acid (IAA) is an important plant hormone required for various plant growth and developmental activities. YUCCA proteins are the enzymes for IAA synthesis that catalyze the rate-limiting step. However, the YUCCA gene family in Japanese apricot has not been thoroughly characterized. Here, we investigated the eff ect of rootstocks on scion growth of Japanease apricot and genes involved in auxin biosynthesis ( YUCCA ). Growth characteristics revealed that the height of ‘Longyan’ [ Prunus mume Sieb. et Zucc] plants with P. mume rootstock were signifi cantly shorter than ‘Longyan’ plants with P. persica rootstock. This study isolated 13 PmYUCCA genes from the Japanese apricot genome. Bioinformatics and expression studies were undertaken to investigate the functions and characteristics of YUCCA genes. The physicochemical properties, gene structure, conserved domains, conserved motif, and phylogenetic relationships of YUCCA genes were determined using bioinformatics analysis. Likewise, we analyzed the expression of PmYUCCA genes in Japanese apricot’s leaf and stem-bark (scion). The expression levels of PmYUCCA3 and PmYUCCA5 genes were noticeably lower in the leaves of ‘Longyan’/ P. mume graft combination than that of the ‘Longyan’/ P. persica graft combinations, suggesting their distinct roles in regulating growth vigor. This research explores the genome-wide identifi cation, characterization, and possible relationship between growth vigor and expression profi le analysis of the YUCCA gene family in Japanese apricot.