정렬 및 비정렬 격자를 이용한 선박 저항 계산에서 Courant 수의 공간 분포 및 LTS 기법의 효율성에 관한 연구
A Study on Spatial Distributions of Courant Number and Numerical Efficiency of LTS Method in Calculation of Ship Resistance Using Structured and Unstructured Meshes
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초록
Numerical simulations of ship resistance have been performed to compare spatial characteristics of Courant number when using structured and unstructured meshes. When Euler scheme was used for time integration, the structured mesh provided a more efficient calculation because the calculation time interval was larger than that of unstructured mesh. The automatic generation of very small meshes in the unstructured mesh was mainly responsible for the limitation of calculation time interval. When local time stepping Euler scheme was applied, however, the ship resistance of unstructured mesh showed a rapid convergence while a slow convergence of ship resistance in structured mesh was caused by the small time interval in bulbous bow.
Abstract
Numerical simulations of ship resistance have been performed to compare spatial characteristics of Courant number when using structured and unstructured meshes. When Euler scheme was used for time integration, the structured mesh provided a more efficient calculation because the calculation time interval was larger than that of unstructured mesh. The automatic generation of very small meshes in the unstructured mesh was mainly responsible for the limitation of calculation time interval. When local time stepping Euler scheme was applied, however, the ship resistance of unstructured mesh showed a rapid convergence while a slow convergence of ship resistance in structured mesh was caused by the small time interval in bulbous bow.
참고문헌 (8)
- Asen, P., "Analysis of the flow around a cruise ferry hull by the means of computational fluid dynamics", Master, pp.2014
- 최정은, "와류생성기를 부착한 선박의 속도성능에 대한 수치적 추정", 대한조선학회 논문집, 46(2), pp.136~147 (2009), 대한조선학회
- Choi, J.E, "Resistance and propulsion characteristics of various commercial ships based on CFD results", Ocean Engineering, 37, pp.549~566 (2010)
- Kim, G. H., "Joint development project on seakeeping simulations using OpenFOAM –industrial perspective", 11th OpenFOAM Workshop (2016)
- 이상봉, "선체 저항에 대한 수치 해석의 통계적 신뢰도 분석", 대한조선학회 논문집, 51(4), pp.321~327 (2014), 대한조선학회
- 박선호, "Investigation on the wall function implementation for the prediction of ship resistance", International Journal of Naval Architecture and Ocean Engineering, 5(1), pp.33~46 (2013), 대한조선학회
- 박상훈, "CFD 저항 해석을 이용한 컨테이너선 최적 트림추정법에 대한 연구", 대한조선학회 논문집, 51(5), pp.429~434 (2014), 대한조선학회
- Perez G,C.A., "Validation and verification of hull resistance components using a commercial CFD code", 11th Numerical Towing Tank Symposium (2008)