摘要
Computational simulations of multiphase flow are challenging because many practical applications require adequate resolution of not only interfacial physics associated with moving boundaries with possible topological changes,but also around three-dimensional,irregular solid geometries.In this paper,we highlight recent efforts made in simulating multiphase fluid dynamics around complex geometries,based on an Eulerian-Lagrangian framework.The approach uses two independent but related grid layouts to track the interfacial and solid boundary conditions,and is capable of capturing interfacial as well as multiphase dynamics.In particular,the stationary Cartesian grid with time dependent,local adaptive refinement is utilized to handle the computation of the transport equations,while the interface shape and movement are treated by marker-based triangulated surface meshes which freely move and interact with the Cartesian grid.The markers are also used to identify the location of solid boundaries and enforce the no-slip condition there.Issues related to the contact line treatment,topological changes of multiphase fronts during merger or breakup of objects,and necessary data structures and solution techniques are also highlighted.Selected test cases including spacecraft fuel tank flow management and liquid plug flow dynamics are presented.
基金
The work reported in this paper has been partially supported by NASA Constellation University Institutes Program(CUIP),Claudia Meyer and Jeff Rybak programmanagers
We have benefitted from communication with Jim Grotberg and Hideki Fujioka of the University of Michigan while investigating the liquid plug flow problems。
作者简介
Corresponding author:Eray Uzgoren,Email addresses:uzgoren@vt.edu;Jaeheon Sim,honeypot@umich.edu;Wei Shyy,weishyy@umich.edu。
