Direct forcing/fictitious domain-Level set method for two-phase flow-structure interaction

doi:2011.25.4.36

J. Ocean Eng. Technol. > Volume 25(4); 2011 > Article

J. Ocean Eng. Technol. 2011;25(4):36-41.
DOI: https://doi.org/10.5574/KSOE.2011.25.4.036

Jeon Chung-Ho,Yoon Hyun-Sik,Jung Jae-Hwan

Dept. of Naval architect and ocean engineering Pusan National University,Advanced Ship Engineering Research Center Pusan National University,Dept. of Naval architect and ocean engineering Pusan National University

이상 유동에서의 유체-구조 연성해석을 위한 Direct Forcing/Ficititious Domain-Level Set Method

전충호,윤현식,정재환

부산대학교 조선해양공학과,부산대학교 첨단조선공학연구센터,부산대학교 조선해양공학과

Keywords: Immersed Boundary Method, Direct Forcing/Fictitious Domain (DF/FD), Level-Set Method, Free Surface, Two-phase Flow, Fluid Structure Interaction

핵심용어: 가상경계법, 레벨셋 법, 자유수면, 이상 유동, 유체-구조연성, Water Entry 입수

Abstract

In the present paper, a direct forcing/fictitious domain (DF/FD) level set method is proposed to simulate the FSI (fluid-solid interaction) in two-phase flow. The main idea is to combine the direct-forcing/fictitious domain (DF/FD) method with the level set method in the Cartesian coordinates. The DF/FD method is a non-Lagrange-multiplier version of a distributed Lagrange multiplier/fictitious domain (DLM/FD) method. This method does not sacrifice the accuracy and robustness by employing a discrete ${delta}$ (Dirac delta) function to transfer quantities between the Eulerian nodes and Lagrangian points explicitly as the immersed boundary method. The advantages of this approach are the simple concept, easy implementation, and utilization of the original governing equation without modification. Simulations of various water-entry problems have been conducted to validate the capability and accuracy of the present method in solving the FSI in two-phase flow. Consequently, the present results are found to be in good agreement with those of previous studies.