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Numerical Simulation of the Airflow in Atomospheric-Boundary-Layer Wind Tunnel

Author: XuWei
Tutor: ShenShiZuo；SunXiaoYing
School: Harbin Institute of Technology
Course: Structural Engineering
Keywords: Wind tunnel Airflow of atmospheric boundary layer Technology of passive simulation CFD numerical simulation
CLC: TU317
Type: Master's thesis
Year: 2007
Downloads: 502
Quote: 11
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Abstract


A closed-circuit wind tunnel laboratory is being constructed by Haerbin Institute Technology (HIT), which could be able to simulate the effect with both the air boundary layer (ABL) airflow and ocean wave together. Its exterior structure construction has been completed, while the tunnel body is being installed now. Then, artificial blockage device is needed to add into the test section, to form kinds of ABL airflow conditions which are required by wind tunnel test. The numerical simulation technology based on Computational Fluid Dynamics (CFD) can reproduce the airflow in wind tunnel easily and rapidly, so it’s significant to use this technology to simulate the ABL airflow and reproduce the inflow conditions of wind tunnel.There are many factors affecting the numerical precision while using CFD method to simulate airflow around bluff body, so it’s very important to set these factors correctly. Firstly, research on setting of computational domain based on a standard cube and its expanded models has been carried out. And, the standard of setting of computational domain to five different styles of buildings was presented. Secondly, selection of turbulence models in numerical simulation of the standard cube model has been studied deeply, and the suitable turbulence models in the simulation of airflow around bluff body were pointed out.Based on the above research, full-scale model of the wind tunnel small-test-section has been established, and the spires and roughness elements in passive simulation technology were presented into the numerical tunnel to carry out the research on numerical simulation of ABL airflow. Firstly, the airflow reproduce device in TJ-2 wind tunnel was simulated, and it is proved that using CFD numerical method to simulate the ABL airflow is feasible. Then, passive simulation device of wind tunnel of HIT have been designed primarily and series of parameters analysis on passive simulation technology with spires and roughness elements are performed based on the design. The main controlling factors and the airflow-characters laws caused by them have been obtained in the airflow debugging process. At last, the conclusions were applied in the simulation of the airflow characters of four categories of physiognomy prescribed in codes. In addition, without affecting the downstream flow of the measurement center,optimizing design has been excited to minimize the kinds of spires and roughness elements.

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CLC: > Industrial Technology > Building Science > Building structure > Structure theory to calculate > Structural Testing and Inspection
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