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비정상RANS법과 중첩격자계를 이용한 횡파중 선박운동 수치해석Numerical analysis of ship motions in beam sea using unsteady RANS and overset grid methods
- Other Titles
- Numerical analysis of ship motions in beam sea using unsteady RANS and overset grid methods
- Authors
- 박일룡; Seyed Hamid Sadat Hosseini; Frederick Stern
- Issue Date
- 1-4월-2008
- Publisher
- 대한조선학회
- Keywords
- roll motion; heave motion; RANS method; overset grid method; level-set method
- Citation
- 대한조선학회논문집, v.45, no.2, pp 109 - 123
- Pages
- 15
- Journal Title
- 대한조선학회논문집
- Volume
- 45
- Number
- 2
- Start Page
- 109
- End Page
- 123
- Abstract
- 국문초록 본 논문은 횡파중 선박운동에 대한 CFD결과를 제공한다. 대상 선형은 빌지킬이 부착된 ONR Tumblehome모형이다. 횡파중 모형시험은 파경사 0.156, 파장 1.12Lpp의 횡파중 전진속도가 없는 모형선의 횡요와 상하동요의 2자유도 운동에 대한 것이다. 본 문제는 비정상 RANS기법을 이용하여 해석된다. 자유수면은 단상(single phase) LS(level-set)법을 이용하여 해석되며, 선박의 운동은 선체의 운동에 따라 함께 움직이는 동적 중첩격자(dynamic overset grid method)를 이용하여 predictor-corrector반복법으로 해석된다. 해석된 CFD결과는 모형시험결과와 비교될 예정이다. ABSTRACT The present paper will provide the CFD result for a beam wave test case. An ONR tumblehome ship model with bilge keels is used. The beam wave test is for zero forward speed and roll and heave 2DOF with wave slope=0.156 and wavelength=1.12Lpp, with Lpp the ship length. The problems is solved numerically with an unsteady Reynolds averaged Navier-Stokes approach. The free surface flow is computed using a single-phase level-set method and the motions in each time step are integrated using a predictor-corrector iteration approach which uses dynamic overset grids moving with relative ship motion. The predicted CFD results for motions and forces of the ONR tumblehome model will be compared with the available experimental data.
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