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논문 기본 정보
- 자료유형
- 학위논문
- 저자정보
- 지도교수
- 정세민
- 발행연도
- 2020
- 저작권
- 조선대학교 논문은 저작권에 의해 보호받습니다.
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When performing CFD(Computational Fluid Dynamics) simulations, solvers and schemes with discretizing governing equations by FVM(Finite Volume Method) and adopting unstructured grids are generally used because of its advantage over the conventional approach using structured grid. However, the grid generation process can still be very time consuming and needs toughness for a complex geometry. Moreover, the convergence and accuracy of the simulation results are very much affected by the quality of the grid. On the contrary, the gridless (or meshfree) methods are feasible and robust for the problems with moving boundary and/or complicated boundary shapes, because these methods do not need to generate a grid system.
In this study, a newly-developed Eulerian gridless solver for the simulation of two-dimensional unsteady incompressible viscous thermal flows around a moving body in the low Reynolds number is introduced. The convection and diffusion equation of heat with adopting Boussinesq approximation is added to deal with heat transfer phenomena. For the implementation of a moving body, moving domain method based on ALE(Arbitrary Lagrangian Eulerian) technique is adopted. The spatial derivatives of governing equations are solved by WMLS(Weighted Moving Least Square) interpolations on a cloud of points. A Fractional time step method is adopted and the Poission equation for the pressure are solved by successively in the WMLS sense. Some benchmark simulations of the flows including heat transfer and a moving body are solved by the developed solver for the validation and the results are compared with analytic solution and those by experiments and other CFD simulations.
In this study, a newly-developed Eulerian gridless solver for the simulation of two-dimensional unsteady incompressible viscous thermal flows around a moving body in the low Reynolds number is introduced. The convection and diffusion equation of heat with adopting Boussinesq approximation is added to deal with heat transfer phenomena. For the implementation of a moving body, moving domain method based on ALE(Arbitrary Lagrangian Eulerian) technique is adopted. The spatial derivatives of governing equations are solved by WMLS(Weighted Moving Least Square) interpolations on a cloud of points. A Fractional time step method is adopted and the Poission equation for the pressure are solved by successively in the WMLS sense. Some benchmark simulations of the flows including heat transfer and a moving body are solved by the developed solver for the validation and the results are compared with analytic solution and those by experiments and other CFD simulations.
목차
ABSTRACT V제1장 서론 1제2장 수치해석기법 6제1절 지배방정식 및 알고리즘 6제2절 근사다항식 및 이동최소자승법 8제3절 가중함수 및 점군 구성 10제4절 포아송 방정식 14제5절 이동 물체 처리기법 17제3장 수치 시뮬레이션 18제1절 열 확산 18제2절 고정된 물체 주위 자연대류 201. 측면 온도차에 의한 자연대류 202. 사각 공동내의 가열된 원주에 의한 자연대류 23제3절 이동하는 물체 주위 유동 291. 등속 이동하는 원주 주위 유동 292. 조화 운동하는 원주 주위 유동 33제4장 결론 45참고문헌 47
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