基于分离涡方法的标准CAARC模型流固耦合风致响应分析

为了研究流固耦合效应对高层建筑结构的风致响应影响，以标准CAARC高层建筑模型为研究对象，基于CAARC模型的物理特性建立了气弹性模型，用一种新的湍流脉动流场产生方法(DSRFG)生成入口湍流，采用分离涡方法对该建筑进行了单、双向流固耦合数值风洞模拟。将模拟结果与风洞试验结果进行对比，结果表明：结构的气弹特性与风洞吻合，分离涡方法在模拟非定常风场有较强的适用性和准确性。考虑了流固耦合的双向有限元模型与未考虑流同耦合的单向有限元模型，在流场和风致响应方面均有较大差异，流场方面，双向模型比单向模型有着更广泛的近尾流区域；响应方面，除阻力系数外，双向模型较单向模型响应有减小趋势，其中结构顺风向也更易受流固耦合效应影响。在较低的结构阻尼下，耦合效应产生的气动阻尼对结构响应影响较大，高层建筑流固耦合效应不可忽略。

Analysis of wind-induced response of CAARC model using detached eddy simulation based on fluid-structure interaction

To explore the Fluid-Structure Interaction (FSI) effect on the wind-induced response of high-rise building, the CAARC high-rise building model was taken as the research object. An aeroelastic model was established based on the physical characteristics of the CAARC model. A new turbulence generation method (DSRFG) was used to generate inlet turbulence. The one-way FSI and two-way FSI simulation technique was carried out by using the Detached Eddy Simulation(DES) method. The results are compared with the wind tunnel test ,it shows that the aeroelastic characteristics of the structure are consistent, and the DES method has strong applicability and accuracy in simulating the unsteady wind field. The one-way FSI and two-way FSI simulation results have great differences in flow field and wind-induced response. In terms of flow field, the two-way FSI has a wider wake area near the structure than the one-way FSI. In addition to the drag coefficient, the response of the two-way FSI has a decreases trend when compared with that of the one-way FSI, and the along wind direction of the structure is also more susceptible to the fluid-structure coupling effect. On a low structural damping level, the aerodynamic damping caused by FSI effect has a great influence on the structural response, the FSI effect of high-rise buildings cannot be ignored.