대한기계학회논문집B (Transactions of the Korean Society of Mechanical Engineers B)

  • 제40권6호
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  • Pages.347-355
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  • 2016
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  • 1226-4881(pISSN)
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  • 2288-5324(eISSN)
대한기계학회 (The Korean Society of Mechanical Engineers)
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부유 입자를 해석하기 위한 운동량 교환/가상영역-격자볼츠만 방법

A Momentum-Exchange/Fictitious Domain-Lattice Boltzmann Method for Solving Particle Suspensions

  • Jeon, Seok Yun (Dept. of Mechanical Engineering, Hanyang Univ.) ;
  • Yoon, Joon Yong (Dept. of Mechanical Engineering, Hanyang Univ.) ;
  • Kim, Chul Kyu (Korea Institute of Civil Engineering and Building Technology) ;
  • Shin, Myung Seob (Advanced Transportation Examination Division, Korea Intellectual Property Office(KIPO))
  • 투고 : 2015.04.04
  • 심사 : 2015.12.07
  • 발행 : 2016.06.01
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초록

본 연구에서는 격자볼츠만 방법을 기반으로 유체-입자 상호작용에 대한 수치계산을 수행하였다. 유체 유동은 격자볼츠만 방법을 이용하였으며, 유동장 내에서의 고체입자 운동은 계산점(node) 기반의 가상영역으로 간주하여 해석하였다. 유체-입자의 상호작용은 격자볼츠만 방법의 지배방정식에 국부적으로 운동량 교환량을 추가하여 해석하며, 가상영역 내에 위치한 고체입자의 병진 및 회전 운동은 뉴턴 운동 방정식과 오일러(Euler) 방정식을 이용한다. 구성된 상호작용 모델의 유효성을 검증하기 위하여 중립상태에서의 부유 입자운동 및 단 입자의 침강에 대한 수치계산을 수행하였으며, 기존 연구들과의 비교를 통하여 본 연구의 유체-입자 상호작용 모델이 갖는 신뢰성과 효용성을 평가하였다.

This study presents a Lattice Boltzmann Method (LBM) coupled with a momentum-exchange approach/fictitious domain (MEA/FD) method for the simulation of particle suspensions. The method combines the advantages of the LB and the FD methods by using two unrelated meshes, namely, a Eulerian mesh for the flow domain and a Lagrangian mesh for the solid domain. The rigid body conditions are enforced by the momentum-exchange scheme in which the desired value of velocity is imposed directly in the particle inner domain by introducing a pseudo body force to satisfy the constraint of rigid body motion, which is the key idea of a fictitious domain (FD) method. The LB-MEA/FD method has been validated by simulating two different cases, and the results have been compared with those through other methods. The numerical evidence illustrated the capability and robustness of the present method for simulating particle suspensions.

키워드

참고문헌

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