SELECTION OF THE COMPUTATIONAL MODEL OF WIND FLOW IN THE PROBLEMS OF COMPUTATIONAL ARCHITECTURAL AND CIVIL ENGINEERING AERODYNAMICS IN ACCORDANSE WITH REGULATORY AND TECHNICAL DOCUMENTS

Abstract

An overview of the main directions of numerical simulation of problems of architectural and civil engineering aerodynamics based on Computational Fluid Dynamics (CFD) is presented. The main advantages of numerical simulation in comparison with traditional methods of aero-physical modeling in wind tunnels are highlighted. The basic principles of numerical simulation of wind loads and actions on buildings and structures are outlined. In modern practice, numerical modeling by finite volume method is used with the decomposition of the velocity of the turbulent wind flow into the average and pulsation component within the averaged by Reynolds solution of Navier-Stokes equations using the semi-empirical turbulence model k-ш SST. In practice, the problem of the legitimate (in accordance with the requirements of building codes) selection of a computational model of wind flow is very important. This is equivalent to the assignment of boundary conditions within numerical simulation. The computational model of the wind, presented in the Russian building codes, requires additions to solve the problems of numerical simulation of architectural and civil engineering aerodynamics. A detailed comparison of the computational models of wind flow in Russian and foreign building codes is carried out. The following wind flow parameters are analyzed: the profile of the average wind speed, the profile of the intensity of turbulence, the profile of the scale of turbulence. A table of correspondence of terrain types according to the classification of Russian and foreign codes is proposed. The possibility of determining the parameters of the computational wind flow model based on the joint use of building codes in force in Russia and Belarus is shown. A set of measures is proposed with the goal of creating a regulatory and technical environment for the practical application of computational architectural and civil engineering aerodynamics in real design.