Speaker: R. Panneer Selvam, Civil Engineering, University of Arkansas.
Date: Monday, March 26th, 2018, 5:00PM-6:00PM
Location: SCEN 322
Title: Fourier Spectral Method for Engineering Applications
Abstract: Turbulence in wind has immense effect on peak pressures on building and structures. The ASCE design provisions are based on wind tunnel (WT) measurements. The current practice in WT predicts the peak pressures by less than 50% at key areas on building comparing to field measurements. Because of this many buildings have failures due to severe wind every year. This is due to lack of simulating low frequency part of the turbulence in the WT. Similarly, the computer modeling based on fluid dynamics (CFD) also has problems due to lack of simulating high frequency part of the turbulence. The major challenge in transporting the turbulence spectrum using CFD is due to lack of having enough grid resolution with the existing methods like finite element method (FEM) and finite difference method (FDM). For this highly accurate Fourier spectral method (FSM) is investigated. The FSM can reduce the grid point more than 10 times but the method can be applied only to periodic boundary problems. In this research FSM is modified for non-periodic problems and structures in the flow regions. The existing method and newly proposed method will be discussed with bench mark problems.
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