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A discrete exterior calculus finite element method for solving two phase flow problems.

机译:解决两相流问题的离散外部演算有限元方法。

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摘要

The understanding of bubble nucleation, growth, and collapse has many practical applications ranging from nuclear to naval and even space. For example, high efficiency nuclear stations, which include cooling systems with high pressure two-phase flows, could be improved through the modeling of vapour-gas interactions. Because of this widespread applicability, ongoing research to develop efficient, high-accuracy algorithms and software to solve complex simulation scenarios of three-dimensional vapour bubble interactions with their surrounding fluid has significant implications.This thesis proposes an efficient approach to solving flow problems accurately (with an emphasis on two-phase flow) by applying discrete exterior calculus to a vorticity based method. To solve flow problems computationally, they must be resolved at a discrete level with minimal loss in accuracy. As discrete exterior calculus applies differential and integral calculus of vector functions to a discrete model, it is ideally suited to building discrete mathematical operators such as Grad, Curl, Div and Laplace directly, resulting in sparse matrix operators that are computationally efficient. The proposed approach bridges the gap between the engineering discipline and discrete exterior calculus, a commonly overlooked mathematical field that is ideally suited for solving complex problems in a discrete domain. Furthermore, through the use of the vorticity formulation of the Navier-Stokes equations, this discrete model intrinsically preserves angular momentum.
机译:对气泡成核,增长和破裂的理解具有许多实际应用,从核到海军甚至太空。例如,可以通过对蒸气-气体相互作用进行建模来改善包括具有高压两相流冷却系统的高效核电站。由于这种广泛的适用性,正在进行的研究以开发有效,高精度的算法和软件来解决三维汽泡与周围流体相互作用的复杂模拟场景具有重要的意义。强调两相流),方法是将离散的外部演算应用于基于涡度的方法。为了通过计算解决流量问题,必须以最小的精度损失在离散的级别上解决它们。由于离散外部演算将向量函数的微分和积分演算应用于离散模型,因此非常适合直接构建离散数学运算符,例如Grad,Curl,Div和Laplace,从而产生计算效率高的稀疏矩阵运算符。提出的方法弥合了工程学科和离散外部演算之间的差距,离散外部演算是一个通常被忽略的数学领域,非常适合解决离散领域中的复杂问题。此外,通过使用Navier-Stokes方程的涡度公式,该离散模型本质上保留了角动量。

著录项

  • 作者

    Klimas, Peter.;

  • 作者单位

    Carleton University (Canada).;

  • 授予单位 Carleton University (Canada).;
  • 学科 Engineering Aerospace.Physics Fluid and Plasma.Engineering Mechanical.
  • 学位 M.A.Sc.
  • 年度 2009
  • 页码 223 p.
  • 总页数 223
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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