거친 지표면 조도구분의 패턴에 따른 난류경계층의 유동 및왜도에 미치는 영향에 대한 연구
Effect of Surface Roughness Pattern on Flow and Skewness of Turbulent Boundary Layer
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초록
본 연구는 거친 표면에서의 유동장 특성에 대해 실험 및 수치해석적 연구를 수행하였다. 완전 발달한 두꺼운 난류경계층은풍동 내 바닥에 깔린 거친 표면을 이용하여 생성하였다. 평균유동과 난류강도 및 왜도와 같은 난류경계층의 특성을 열선유속계를 이용해 측정하였다. 풍동실험결과와의 비교를 위해 난류경계층은 수치해석을 이용하여 모사하였다. 거친 벽표면은 기본적으로 난류경계층 생성에 사용되었으며 입출구면에는 주기경계조건이 적용되었다. 본 연구결과로서 난류경계층이 거친 표면 위에서 성공적으로 생성되었으며 평균유동과 난류강도 및 왜도와 같은 난류경계층의 특성은 지표면조도에 따라 달라진다는 것을 확인하였다.
Abstract
In this study, the characteristics of flow field on the rough surface were examined. The fully developed thick turbulent boundary layer has been made in the boundary layer wind tunnel with the cube arrays patch on the floor of boundary layer wind tunnel, which has patterns of staggered and aligned roughness. The boundary layer properties such as mean flow and turbulent statistics such as stresses and skewness were measured using thermal anemometry. In order to compare with wind tunnel measurement, the turbulent boundary layer was also simulated using the numerical simulation. Rough wall surface was basically used generate the turbulent boundary layer and periodic boundary condition was coaxially applied for both inlet and outlet sections. Results show that turbulent boundary layer have successfully been generated on the roughness surface, and the boundary layer properties vary depending on the pattern of surface roughness.
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