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Simulation of urban microclimate with uhiSolver:software validation using simplifed material data

Ecological Processes 2021年第1期10卷 921-943页

作者： Florian Teichmann christina maria baumgartner Andras Horvath Markus Luisser Azra Korjenic Vienna University of Technology ViennaAustria. Rheologic GmbH ViennaAustria.

Background:Increasing urbanization as well as global warming requires an investigation of the infuence of diferent construction methods and ground surfaces on the urban heat island efect(UHI efect).The extent of the infuence of the urban structure,the building materials used and their surfaces on the UHI efect can be signifcantly reduced already in the planning phase using a designated OpenFOAM-based solver“uhiSolver”.Results:In the frst part of this research work,it is shown that inner building details and components can be neglected while still obtaining sufciently accurate *** this purpose,the building model was divided into two layers:a surface layer without mass,where the interaction with radiation takes place,and a component layer,which contains all relevant components and cavities of the building represented with mass-averaged material *** has become apparent that the three parameters—albedo,heat capacity and thermal resistance—which have a decisive infuence on the interaction,have diferent efects on the component temperatures and the surface *** the second part of this research work,dynamic 3D computational fuid dynamics(CFD)simulations are performed with uhiSolver for a residential block in *** the simulation results with measurement data collected on site,it is shown that the simplifed assumption of homogeneous material data for building bodies provides very good results for the validation case ***,the infuence of the greening measures in the courtyard of the residential block on the air temperature is found to be ***,it was observed that due to locally higher radiation density,lower air velocities and higher air humidity,the apparent temperature in the courtyard is sometimes perceived to be higher than in the adjacent streets,despite the lower air ***:Simplifying the modeling process of the uhiSolver software by reducing the model complexity helps to reduce

关键词： Urban heat island efect Urban microclimate CFD simulation Microclimate simulation Apparent temperature

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