Numerical Simulation Study On Wind Field Characteristics Of Large Chassis High-Rise Building

Wind load is one of the control loads in the structure design ofhigh-rise building. As the expanding of city scale and the increasing ofconstruction height, the analysis of wind resistant performance of structurebecomes more important. This paper based on the fluid computationsoftware FLUENT to do the numerical simulation of wind field around theconstruction, introduces the basic conception of Wind Engineering and thetheory of CFD, derives the continuity equation, fluid motion differentialequation and viscous incompressible N-S equation and discusses theturbulence models’ basic theory in detail. Through the calculation andanalysis of the2D and3D model, this paper discusses the efficiency ofmodeling on Wind Engineering calculation, the influence of the meshdensity and grid form on the simulation precision and calculationefficiency, and how to realize the inlet velocity boundary conditions.Using RSM turbulence model to simulate2D unsteady flow, thechassis’ lift and resistance time-history curves and average wind-load coefficient of the concave chassis structure model are obtained. In order toverify the calculation method’s the accuracy and effectiveness, simulationresults compared with the references and standards. The shape coefficientof each surface on L and concave buildings is established. Conclusionscan offer reference for engineering practice.Take a hotel service apartment with commercial podium somewhereas the research object, the wind pressure on the buildings and theflow-field around the buildings are investigated by Realizable turbulencemode. Basic average shear force factor and basic average momentcoefficient are gained by analyzing the structure’s wind pressurecoefficient distribution characteristics and wind field formation at4typicalwind angles. Turbulent kinetic energy contour distribution graph isprovided. The wind field’s character of complex large chassis twin towersstructure and interactions of twin towers and slit effects characteristic arestudied. The present conclusions of3D simulation can provide evidencefor similar construction structure’s wind resistance design and engineeringapplication.