本文選題：建筑風(fēng)驅(qū)雨　切入點(diǎn)：歐拉多相流模型　出處：《合肥工業(yè)大學(xué)》2017年碩士論文　論文類(lèi)型：學(xué)位論文

【摘要】：風(fēng)驅(qū)雨(Wind-Driven Rain,簡(jiǎn)稱(chēng)WDR)是雨滴在垂直墜落的過(guò)程受風(fēng)力驅(qū)動(dòng)獲得水平速度分量從而出現(xiàn)斜向飄落的現(xiàn)象。WDR是建筑外立面最主要的水分來(lái)源,直接影響建筑外墻材料耐久性與建筑溫濕性能,易引發(fā)諸多常見(jiàn)工程問(wèn)題,如墻面滲水、壁面泛鹽、霜凍、風(fēng)化以及徑流污染等,甚至危及結(jié)構(gòu)安全,因此掌握WDR分布特性是深入上述工程問(wèn)題研究的重要基礎(chǔ)。近年來(lái),作為建筑立面WDR分布重要影響因素的氣動(dòng)效應(yīng)已逐漸成為研究重點(diǎn),其主要包括單體建筑的風(fēng)阻效應(yīng)和群體建筑的氣動(dòng)干擾效應(yīng),有針對(duì)性地開(kāi)展有關(guān)研究工作,對(duì)于科學(xué)指導(dǎo)WDR相關(guān)領(lǐng)域的研究與設(shè)計(jì),有效降低建筑WDR災(zāi)害具有重要的理論與應(yīng)用意義。本文采用基于歐拉多相流模型的CFD數(shù)值模擬方法開(kāi)展WDR氣動(dòng)效應(yīng)的模擬分析與研究。首先,模擬已有建筑WDR實(shí)測(cè)場(chǎng),通過(guò)對(duì)比分析模擬結(jié)果與實(shí)測(cè)數(shù)據(jù),驗(yàn)證CFD數(shù)值方法對(duì)于單體建筑與具有強(qiáng)烈氣動(dòng)干擾效應(yīng)的群體建筑WDR場(chǎng)模擬的有效性。其次,針對(duì)多(高)層平屋面單體建筑,模擬建筑立面高度與寬度變化時(shí)的WDR場(chǎng),重點(diǎn)分析建筑立面WDR分布特性及立面前區(qū)流場(chǎng)的變化特點(diǎn),獲取立面尺寸變化時(shí)風(fēng)阻效應(yīng)對(duì)建筑迎風(fēng)立面WDR分布影響的規(guī)律,并比較ISO半經(jīng)驗(yàn)?zāi)Ｐ偷念A(yù)測(cè)結(jié)果,表明該模型缺乏考慮尺度變化下風(fēng)阻效應(yīng)對(duì)WDR分布的影響,也未能反映風(fēng)阻效應(yīng)引起的迎風(fēng)立面WDR橫向分布變化的特點(diǎn),因此該模型需要引入尺度性的區(qū)域墻因子,從而提高預(yù)測(cè)精度。最后,針對(duì)兩建筑串列布局方式,考慮施擾建筑高度及建筑間距變化,模擬不同工況下受擾建筑迎風(fēng)立面WDR分布,通過(guò)與單體布局情況進(jìn)行比較,重點(diǎn)分析受擾建筑迎面風(fēng)WDR分布特點(diǎn)及局部區(qū)域WDR變化規(guī)律,獲取該布局變化時(shí)氣動(dòng)干擾對(duì)受擾建筑迎風(fēng)立面WDR分布的影響特性,并提出以干擾因子量化反映干擾效應(yīng),為完善ISO模型能有效反映組合布局氣動(dòng)干擾對(duì)迎風(fēng)立面WDR分布影響提供參考。本文研究成果可為深入氣動(dòng)效應(yīng)對(duì)建筑立面WDR分布影響研究提供參考依據(jù),并為實(shí)際工程的設(shè)計(jì)應(yīng)用提供指導(dǎo)。
[Abstract]:The wind-driven rain (Wind-Driven Rain, referred to as WDR) is obtained by the rain wind driven horizontal velocity component and oblique falling phenomenon of.WDR is the main water source of the facade of the building in the process of vertical fall, directly affect the exterior durability of material and construction temperature and humidity can easily lead to many common engineering problems, such as the wall of water seepage, wall salt pan, frost weathering and runoff pollution, even endanger the safety of the structure, thus grasp the WDR distribution characteristics is an important basis for in-depth study of the project. In recent years, as the building elevation of WDR distribution important factors influencing the aerodynamic effect has gradually become the focus of research, which mainly includes the drag effect and group building monomer building the aerodynamic interference effect, targeted to carry out relevant research work, the research and design of WDR for scientific guidance in related fields, effectively reduce the building disaster with WDR There are important theoretical and practical significance. This paper uses the CFD simulation analysis and research based on numerical Eulerian multiphase flow model simulation method to carry out WDR aerodynamic effects. First, the simulation of existing building WDR field measurement, analysis of simulation results and the measured data by comparison, verify the CFD numerical method for single buildings and has a strong aerodynamic the interference effect of group building WDR field simulation effectiveness. Secondly, aiming at the multi layer flat roof (high) single building, WDR field building elevation height and width change, focusing on building facade WDR distribution characteristics of flow field characteristics and elevation before obtaining the size change of wind resistance effect on the facade of building wind the influence of the elevation of WDR distribution, the prediction results and compare the ISO semi empirical model, show that the model is lack of consideration of scale change under the influence of wind drag effect on the distribution of WDR, also failed to reflect the effect of wind resistance The changing characteristics of the transverse distribution of the windward facade WDR, regional wall factor so the model requires the introduction of the scale, so as to improve the prediction accuracy. Finally, according to the two building tandem layout, considering the interfering building height and building space changes, simulation of the interfered building facade wind WDR distribution under different working conditions, compared with the monomer the layout of the situation, focus on the analysis of the disturbed building head-on wind WDR distribution characteristics and regional variation of WDR, obtain the distribution changes of aerodynamic interference on the windward facade of the interfered building WDR distribution characteristics, and put forward to the interference factor reflect the interference effect, to improve the ISO model can effectively reflect the layout of the combination of aerodynamic interference and provide reference the effect of wind elevation WDR distribution. The research results of this paper can be used for further study on the aerodynamic effect of WDR distribution on the building facade to provide reference, and for practical engineering. The application provides guidance.

【學(xué)位授予單位】：合肥工業(yè)大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類(lèi)號(hào)】：TU238.1

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