구조물주위 풍압의 수치해석에 관한 연구

Abstract

The objective of this study is to investigate the effects of the upstream flow profile and its location on the wind pressure coefficient around a structure. The wind pressure coefficients on the surfaces of a simplified cube structure were computed by using a CFD model with a large eddy simulation. Comparisons were made for two upstream flows, uniform flow and atmospheric boundary layer flow, and two different upstream flow locations, 5 and 10 times the height of the structure L ahead the cube structure for each flow.

The wind pressure coefficients of the uniform flow were much higher than those of the atmospheric boundary layer flow at both 5L and 10L.

In the atmospheric boundary layer flow case, two locations of the upstream flow yielded a small difference in the wind pressure coefficient distribution, whereas the locations did a large difference in the uniform flow case.

It was shown that the atmospheric boundary layer flow at 10L is desirable as the upstream flow boundary conditions, since the wind pressure coefficient is sensitive to the location of the uniform flow.

As a result, both the upstream flow profile and its location are very important and hance must be selected with care when the wind pressure coefficient around a structure is computed.