한국해안해양공학회지 (Journal of Korean Society of Coastal and Ocean Engineers)

한국해안·해양공학회 (Korean Society of Coastal and Ocean Engineers)
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확장형 Boussinesq 방정식에서 비선형파의 내부 조파: 선 조파기법과 원천함수기법

Internal Generation of Nonlinear Waves for Extended Boussinesq Equations: Line Source Method and Source Function Method

  • 김건우 (서울대학교 지구환경시스템공학부) ;
  • 이창훈 (세종대학교 토목환경공학과) ;
  • 서경덕 (서울대학교 지구환경시스템공학부)
  • Kim Gunwoo (School of Civil, Urban and Geosystem Engineering, Seoul National University) ;
  • Lee Changhoon (Department of Civil and Environmental Engineering, Sejong University) ;
  • Suh Kyung-Duck (School of Civil, Urban and Geosystem Engineering, Seoul National University)
  • 발행 : 2005.03.01
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초록

본 연구에서 Nwogu(1993)의 확장형 Boussinesq 방정식에 대하여 한 격자의 조파 띠에 균일하게 분포하는 원천함수를 유도하였다. 원천함수를 포함하는 확장형 Boussinesq 방정식에 부분단계분리법을 적용하여, 에너지 전송속도를 사용하는 선 조파기법의 타당성을 해석적으로 증명하였다. 수평공간 1차원의 경우 선형파 뿐만 아니라 비선형파를 조파하여 원천함수기법에 의한 내부조파기법의 정확성을 검증하였다. 또한 원천함수기법에 의한 수치 결과가 선 내부조파기법에 의한 수치 결과와 동일함을 확인하였다.

In this study, derivation is made of a one-grid source function for the extended Boussinesq equations of Nwogu (1993) in order to generate nonlinear waves internally. The energy velocity approach used in the line source method is verified analytically by the fractional step splitting method. The source function method is verified by generating accurately nonlinear waves as well as linear waves for horizontally one-dimensional cases. It is found that numerical solutions by the source function method are the same as those by the line source method.

키워드

참고문헌

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