• 한국가시화정보학회:학술대회논문집
• /
• 한국가시화정보학회 2003년도 추계학술대회 논문집
• /
• pp.55-58
• /
• 2003

In this paper the numerical method with a zonal embedded grid system for an incompressible flow within a circular container is presented. The algorithm is validated by its application to some typical flow models including the spin-up flow inside a half-circle geometry.

• 한국가시화정보학회:학술대회논문집
• /
• 한국가시화정보학회 2004년도 Proceedings of 2004 Korea-Japan Joint Seminar on Particle Image Velocimetry
• /
• pp.81-90
• /
• 2004

A zonal embedded grid technique has been developed for computation of the two-dimensional Navier-Stokes equations with cylindrical coordinates. The fundamental idea of the zonal embedded grid technique is that the number of azimuthal grids can be made small near the origin of the coordinates so that the grid size is more uniformly distributed over the domain than with the conventional regular-grid system. The code developed using this technique combined with the explicit, finite-volume method was then applied to calculation of the spin-up flows within a semi-circular cylinder. It was shown that the numerical results were in good agreement with the experimental results both qualitatively and quantitatively.

• 한국가시화정보학회지
• /
• 제2권2호
• /
• pp.32-37
• /
• 2004

In this paper the numerical method with a zonal embedded grid system for an incompressible flow within a semi-circular container is presented. The algorithm is validated by its application to some typical flow models including the spin-up flow inside a semi-circular geometry. Flow visualization for the spin-up flows was used by PIV. The results show that at high Reynolds numbers the cyclonic cell at the left-hand side region moves along the circular wall and merges with the cell at the right-hand side region.

• 대한기계학회:학술대회논문집
• /
• 대한기계학회 2004년도 춘계학술대회
• /
• pp.1885-1890
• /
• 2004

In this paper the numerical method with a zonal embedded grid system was applied to the spin-up flow within a semi-circular container. Flow visualization was also performed on a rotating table. The results show that at a low level of damping (i.e. low viscosity and high liquid depth) a cyclonic cell produced initially near the left-hand-side corner of the container moves along a wall and merged with the cell on the right-hand-side.

• 한국가시화정보학회:학술대회논문집
• /
• 한국가시화정보학회 2003년도 추계학술대회 논문집
• /
• pp.71-74
• /
• 2003

In this paper, we report the numerical and experimental results in a half-cylinder. In the numerical computation, we used the zonal embedded grid system. Flow visualization for the spin-up flows was used by PIV. The results show that at left hand side an cyclonic cell moves along a wall and separates into both cells at right hand side.

• 한국항공우주학회지
• /
• 제30권6호
• /
• pp.78-83
• /
• 2002

고속 열차가 터널을 통과할 때 열차 주위와 터널 내부에 발생하는 비정상 유통장을 규명하기 위해서 향상된 겹침 격자기법과 Roe의 FDS를 사용한 축대칭 Euler Solver를 개발하였다. 혼합차원기법이라는 새로운 영역기법을 개발하여 열차와 터널의 상호작용을 해석하는데 적용하였으며, 이 기법은 공간 차원의 최소 가정을 통해서 수치 계산의 효율성을 극대화하는 것에 목적을 두고 있다. 향상된 겹침 격자기법에 개발된 혼합차원기법을 추가하면 완전한 축대칭 방법과 거의 동일한 수준의 수치 정확도를 얻을 수 있다. 혼합차원기법은 특히 긴 터널에서 열차와의 상호작용을 해석할 때 높은 수치적 이득을 얻을 수 있다.