A Sub-Grid Interface Locating Algorithm for Free Surface Two-Phase Flows

doi:10.7652/xjtuxb201701013

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A Sub-Grid Interface Locating Algorithm for Free Surface Two-Phase Flows

更新时间：2025-07-09

- A Sub-Grid Interface Locating Algorithm for Free Surface Two-Phase Flows
- Vol. 51, Issue 1, Pages: 79-87(2017)
- 作者机构：
  
  1. 中国石油大学(华东)石油工程学院,山东,青岛,266580
  2. 中国石化股份胜利油田分公司勘探开发研究院,山东,东营,257015
- 作者简介：
- 基金信息：
- DOI：10.7652/xjtuxb201701013
  CLC： O359
- Online First：10 January 2017，
  
  Published：2017
- 稿件说明：
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A Sub-Grid Interface Locating Algorithm for Free Surface Two-Phase Flows[J]. 2017, 51(1): 79-87.
DOI：

A Sub-Grid Interface Locating Algorithm for Free Surface Two-Phase Flows[J]. 2017, 51(1): 79-87. DOI： 10.7652/xjtuxb201701013.

摘要

针对流体体积(VOF)法处理两相流动界面张力的虚拟流体方法无法准确确定亚网格内界面位置点的问题

提出了一种高精度的界面位置定位算法。该方法根据界面两侧单元界面曲度在亚网格内构建变曲度弧线

实现了两相界面的高精度近似

完成了网格单元中心连线和界面交点位置以及该位置的曲度的准确求取

成功地考虑了界面曲度对亚网格内界面位置的影响

同时方法本身不受网格类型及空间维度的限制。针对毛细管上升、静态液滴、二维气泡上升以及三维气泡上升等物理过程进行了模拟

结果表明:界面曲度对亚网格界面位置可产生显著影响; 亚网格内界面位置的准确捕捉以及该位置点界面曲度的准确求取可以显著改善VOF方法的预测精度

模拟结果显示最好可提高3.5倍。该方法可为复杂结构内高表面张力驱动流提供新的预测手段。

Abstract

In ghost fluid method

for treating surface tension under the framework of volume of fluid(VOF)

the exact location of fluid interface cannot be easily determined. In order to resolve such a problem

a new sub-grid interface locating algorithm is proposed in this work. In the new algorithm

a variable curvature curve

used to approximate the interface in sub-grid

is constructed based on the curvature of the two grid cells on both sides of the interface. As a result

the intersection point of the connection line of centers of interfacial cells and the interface is calculated accurately. The influence of the curvature on the interface location is taken into account. Moreover

this algorithm is independent on mesh type and space dimension. Numerical tests

including capillary rise

static droplet

bubble rise in two-dimensions and three-dimensions

show that interface curvature has a significant influence on the sub-grid interface location. Calculating the sub-grid interface location and the curvature at such a location with high accuracy can improve the numerical prediction of VOF method significantly

and by 3.5 times at the best. This method can provide a new tool for predicting physical behaviors of high surface tension driven flow in complex geometrical structures.

关键词

Keywords

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