Steady Atmospheric Boundary Layer Wind Tunnel Development Study With OpenFOAM

Today a wide range of various complex body building structure appear,while the existing load code can not give these body wind load design. Andbecause of the rapid development of computer hardware and numericalexperiments in the wind tunnel engineering calculations, numerical simulationplays an increasingly important role. Existing commercial computational fluiddynamics simulation software may exist opaque, unable to meet the demand forprofessional in-depth research, open source software OpenFOAM providesmodifiable source code more user-defined place than commercial software, thecalculation process is completely opened and transparent， already meet the basicneeds of computational wind engineering. OpenFOAM has basically met theneeds of computational wind engineering. This paper based on computationalfluid dynamics theory, using open source software OpenFOAM and commercialsoftware Fluent to simulate building surface pressure distribution and windenvironment around buildings of standard model provided by the Tokyo Instituteof Technology and Architectural Institute of Japan(AIJ), then to exploreOpenFOAM in engineering calculations for the specific use, and verify itsaccuracy. Following major elements:Pressure coefficient simulation, selecting several models offered by theTokyo Institute of Technology and using OpenFOAM and Fluent on the samemesh, the same working conditions to simulation analysis is introduced. Takinginto account different wind angle, building aspect ratio and buildings blockingeffect simulates the pressure coefficient of each case. Summarizing the barriereffect of wind pressure distribution occurs with the ratio changes of aspect andwind direction.Wind environment simulation, selecting the model provided by AIJ andusing OpenFOAM and Fluent on the same mesh, to simulate the same conditionsof the model. The vertical plane and the horizontal wind speed around singlebuilding at different locations were evaluated, concluding different height thanthe construction impacts and groups of building and Summarizing the buildingwind environment of different height, buildings inside the wind tunnel environment occurs.Environmental impact of vegetation on the wind through numericalsimulation, the influence of vegetation on wind speed can be added differentregions additional source term to simulate. Using different turbulence models,respectively, with OpenFOAM and Fluent, to analyze and summarize the impactand comparing the accuracy of different additional source term and simulationsoftware.