Full Session with Abstracts
On the Evaluation of Wind-Induced Peak Pressures on Low-Rise Buildings: Experimental and Computational Investigations versus Full-Scale Measurements
Aly Mousaad Aly and Hamzeh Gol Zaroudi
Louisiana State University
Abstract: This study focuses on appropriate processes of atmospheric boundary layer (ABL) for aerodynamic testing, by computational fluid dynamics (CFD) and physical simulations. The results of two-dimensional and three-dimensional numerical CFD models were validated experimentally within a newly built open-jet facility at Louisiana State University (LSU). Various turbulence closures of k-є, Reynolds Stress Model, and Large Eddy Simulation (LES) are employed to assist in selecting appropriate flow management schemes. The LES simulated wind velocity and turbulence intensity profiles are in a good agreement with target profiles for open-terrain. A comprehensive experimental flow quality check was conducted, and the facility was further calibrated by testing scale models of a low-rise building. The open-jet facility is well capable of producing mean wind speed and turbulence profiles representing open-terrain conditions. A larger version of the LSU open-jet facility is currently in construction and new results will be presented. Results obtained from the small-scale open-jet facility reveals the importance of the proximity of the test model to the exit flow, as it controls the length of the separation bubble and hence mean and peak roof pressures. A test model placed at a horizontal distance of two and half times the height of the wind field, from the flow exit, with a width of half the wind field and a length of the height of the wind field, has consistent mean and peak pressure coefficients when compared with available results from wind tunnel testing. Furthermore, testing models with as large as sixteen percent blockage ratio is feasible, revealing the significance of open-jet testing as a robust tool to alleviate scale restrictions. The main objective is to put forward recommendations for testing protocols at open-jet facilities, useful for the design of low-rise buildings.