한국해안·해양공학회논문집 (Journal of Korean Society of Coastal and Ocean Engineers)

  • 제32권1호
  • /
  • Pages.1-10
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  • 2020
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  • 1976-8192(pISSN)
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  • 2288-2227(eISSN)
한국해안·해양공학회 (Korean Society of Coastal and Ocean Engineers)
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오일러 격자체계에서 유체율 함수에 기초한 경계면 추적기법의 비교

Comparison of Volume of Fluid (VOF) type Interface Capturing Schemes using Eulerian Grid System

  • 김도삼 (한국해양대학교 건설공학과) ;
  • 김탁겸 (가톨릭관동대학교 대학원 에너지환경융합학과) ;
  • 신범식 (가톨릭관동대학교) ;
  • 이광호 (가톨릭관동대학교 토목공학과)
  • Kim, Do-Sam (Dept. of Civil Engineering, Korea Maritime and Ocean University) ;
  • Kim, Tag-Gyeom (Dept. of Energy and Environmental Eng., Graduate School, Catholic Kwandong University) ;
  • Shin, Bum-Shick (Waterfront and Coastal Research Center, Catholic Kwandong University) ;
  • Lee, Kwang-Ho (Dept. of Civil Engineering, Catholic Kwandong University)
  • 투고 : 2019.12.11
  • 심사 : 2020.01.28
  • 발행 : 2020.02.28
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초록

자유수면을 포함하는 파동장과 같이 단상의 경계가 시간발전에 따라 지속적으로 변화하는 경우나 액상과 기상이 혼합되는 문제에 있어서는 다상유동(multiphase flow) 문제를 적용하는 예가 증가하고 있다. 특히, 파동장과 같은 자유수면의 문제를 취급하는데 있어서는 혼합되지 않는 액상과 기상의 비압축성 뉴턴유체를 고려한 혼상류 모델이 적용되는 경우가 많다. 일반적으로 혼상류 모델은 각상의 경계면에 대한 시간기반 거동추적이 필수적이며, 궁극적으로는 계산의 정도를 좌우한다. 본 연구는 다양한 CFD 수치해석코드에 적용되고 있는 대표적인 VOF-type의 경계면 추적기법들의 이류성능을 평가하였다. 특히, 기존의 전통적인 VOF-type의 경계면 추적기법 및 이류계산에서 발생하는 수치확산을 최소화하기 위해 수치유속(numerical flux)을 제어하는 FCT 법의 효용성을 평가하고, 더불어 CIP 법을 활용한 자유수면 추적성능의 가능성을 고찰하였다. 그 결과, 본 연구에서 적용한 제한된 조건하에서는 수치확산 방지를 위해 수치확산방지 유속을 도입한 FCT-VOF 법이 가장 높은 경계면의 추적성능을 보였다. 본 연구에서 도출되는 결과는 다양한 수치해석코드에 적용되는 자유수면의 추적기법을 선택함에 있어서 중요한 기초자료로 활용될 것으로 기대된다.

The application of multiphase flows is increasingly being applied to analyze phenomena such as single phase flows where the fluid boundary changes continuously over time or the problem of mixing a liquid phase and a gas phase. In particular, multiphase flow models that take into account incompressible Newtonian fluids for liquid and gas are often applied to solve the problems of the free water surface such as wave fields. In general, multi-phase flow models require time-based the surface tracking of each fluid's phase boundary, which determines the accuracy of the final calculation of the model. This study evaluates the advection performance of representative VOF-type boundary tracking techniques applied to various CFD numerical codes. The effectiveness of the FCT method to control the numerical flux to minimize the numerical diffusion in the conventional VOF-type boundary tracking method and advection calculation was mainly evaluated. In addition, the possibility of tracking performance of free surface using CIP method (Yabe and Aoki, 1991) was also investigated. Numerical results show that the FCT-VOF method introducing an anti-diffusive flux to precent excessive diffusion is superior to other methods under the confined conditions in this study. The results from this study are expected to be used as an important basic data in selecting free surface tracking techniques applied to various numerical codes.

키워드

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