Numerical Simulation Of Wind Effect Of Square Tall Buildings With Different Shape Treatments Based On Fluid-Structure Coupling Method

High-rise buildings are mostly non-streamlined blunt structures and more flexible than traditional buildings,which are more susceptible to wind loads.The relatively large flexibility of the building structure also makes the fluid-structure coupling effect between the structure and the wind non-negligible,so it is necessary to conduct a systematic study on the wind resistance of different shapes of high-rise buildings.In this paper,numerical simulations of wind response of different square high-rise buildings are carried out in ANSYS WORKBENCH platform,and the main work and conclusions are as follows:(1)The standard CAARC model is used as the research object,and the aeroelastic model is established based on its physical properties,and the DSRFG method and DES model are used to numerically simulate the standard model with one-and two-way fluid-solid coupling;the simulation results are compared with the wind tunnel to verify the reliability of the numerical wind tunnel and the accuracy of the simulation method;the simulation results show that,in terms of flow field,the two-way model has a more The simulation results show that the two-way model has a wider near wake region than the one-way model in terms of flow field;in terms of response,except for the drag coefficient,the two-way model has a tendency to reduce the response compared with the one-way model.Through the frequency domain analysis of the flow field and response,the Strohal number under the simulation experiment is 0.097,and the results are compared with the wind tunnel test,and the simulation method in this paper can accurately simulate the cross-wind vortex shedding period.(2)On the basis of the standard model,the model is treated with 5% and 10%chamfering rate or taper ratio,and the same material properties as the standard model are used to analyze the modalities of the model,and the results show that the difference of the first five orders of modalities between different chamfering rates or taper ratios is small,but the first three orders of modalities between different treatments are very different,in which the first three orders of the chamfering model are X-direction,Y-direction and torsional first order,and the taper model The first three orders of the chamfer model are X-,Y-and torsional first order,and the taper model is X-,Y-and X-direction first order,and X-direction second order.(3)Using the same material properties,wind field and experimental setup as the standard model,numerical simulations of eight operating conditions such as singleand two-way flow-solid coupling were performed for the 5% and 10% chamfer rate or taper ratio models;the results of the one-way simulations were compared with the HD-2 rigid wind tunnel tests,and the results showed that the average wind pressure coefficient,drag coefficient and the pulsation value of the drag coefficient were in good agreement with the wind tunnel.Between the rigid model,the downwind and crosswind aerodynamic forces decreased with the increase of taper or chamfer,where the average drag coefficient,17.8% and 29.8% for the 5% and 10% chamfer model,and 16.2% and 23.2% for the 5% and 10% taper model,compared with the standard model,indicating that a certain chamfer or taper treatment of the structure helps to optimize the aerodynamic characteristics of the structure.Between the rigid model and the aeroelastic model,the aeroelastic model with the coupling effect considered has a tendency to reduce the acceleration response in the down and cross wind direction than the rigid model;the average displacement at the top of the aeroelastic standard model is reduced by 2.5% compared with the rigid standard model,15.1%and 29.1% for the 5% and 10% chamfer model,and 9.0% and 10.2% for the 5% and10% taper model,and the chamfer treatment has a greater effect on the average displacement than the taper taper treatment has a greater effect on the mean displacement values,and the difference in the response of the models under the coupling effect is related to the larger aerodynamic damping of the structure.