임의 형상 구조물 주위 유동의 직교 격자계 기반 해석 기술 개발
Development of an IBM-based Code for Assessment of Flow Field around Obstacles of Arbitrary Geometry
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초록
복잡한 형상을 갖는 물체 주위의 2차원 유동장 해석을 위해 물체 형상에 무관하게 해석을 수행할 수 있는 전산 해석 기술 개발을 다루었다. 가상경계법으로 알려진 방법을 이용하여 물체의 경계면 효과를 지배방정식에 운동량과 질량의 가중치를 고려함으로써 점착조건을 만족시켰으며, 유한체적법을 이용한 해석 프로그램을 개발하였다. 직교 격자계를 이용하여 수치해석의 정밀도와 효율성을 높이며, 물체면과 격자선의 차이는 내삽법을 이용한 가중치의 조절로 해결하였다. 사용성을 위해 GUI에 의한 전처리 과정을 개발하였으며, 예제 계산을 통하여 해석 과정을 검증하였다.
Abstract
Development of geometry-independent computational codes for simulation of 2D flows around objects of complex geometry is presented. Referred as immersed boundary method, it introduces virtual forcing to governing equations to represent the effect of physical boundaries. The present method is based on a finite-volume approach on a staggered grid with a fractional-step method to solve Navier-Stokes equation and continuity equation. Both momentum and mass forcings are introduced on and inside the object to satisfy no-slip condition and mass conservation. Since Cartesian grid lines in general do not coincide with the immersed boundaries, several interpolation schemes are employed. An user-friendly preprocessor was developed with GUI and several examples are simulated using the method presented in this study and the results agree well with other results.
참고문헌 (20)
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