Numerical Simulation Study Of Wind Load On Structures Based On CFD

Wind load is an important load for structural design. Sometimes wind load would play adecisive role in structural design, especially for high buildings (for examplechimney\gantry\mast and so on), high-rise buildings, long-span bridges, cooling tower, roofstructures, etc. So the wind-resistant design is an important subject of structural design. Forsome structure with complicated shape，the shape coefficient and wind pressure distributioncannot be determined by the Load code for the design of building structures, and the windtunnel test cannot be used due to the limit of conditions. Hence, it is important in the field ofstructural wind engineering to use the numerical simulation method to determine the shapecoefficient and wind pressure of the structures with complicated shape.This paper uses the numerical simulation method to determine the shape coefficient andwind pressure for the structures based on CFX software. And the contents are as follows:(1) Selecting international standard model of high building CAARC (CommonwealthAdvisory Aeronautical Research Council) which has a simple geometry shape to researchsome parameters of numerical simulation and the result of numerical simulation is comparedwith the result of wind tunnel test from TongJi University. The impact factors includeReynolds number, turbulence model, grids thickness, grid types, and wind directions. And theshape coefficient of the model has also been calculated and analyzed. All of the analysis hasproved that the numerical simulation method can be applied to practical engineering.(2) Using the numerical simulation method to calculate the wind load of a double-towerhigh building. The result of numerical simulation is compared with the result of wind tunneltest; the results of comparison verify again that the numerical simulation can be applied to thepractical engineering. Other than the analysis of the average wind pressure coefficient, theshape coefficient, the flow field of the double-tower high building has also been analyzed.Finally, the effect of the wind load interface of2#tower has been analyzed.(3) Using the numerical simulation method to calculate the average wind pressurecoefficient of a two-way curve roof. The SST turbulence model has been used to calculate four conditions of wind pressure distribution (WINDX+, WINDX-, WINDY+, andWINDY-), and the result of numerical simulation has been compared and analyzed bycompared with the simplified numbers of the code. The result shows that the cantilever partsof roof are the most sensitive parts of wind load. So the cantilever parts of roof should be paidspecial attention to in structural design.