Lab Home | Phone | Search
Center for Nonlinear Studies  Center for Nonlinear Studies
 Home 
 People 
 Current 
 Affiliates 
 Visitors 
 Students 
 Research 
 ICAM-LANL 
 Publications 
 Conferences 
 Workshops 
 Sponsorship 
 Talks 
 Colloquia 
 Colloquia Archive 
 Seminars 
 Postdoc Seminars Archive 
 Quantum Lunch 
 Quantum Lunch Archive 
 CMS Colloquia 
 Q-Mat Seminars 
 Q-Mat Seminars Archive 
 P/T Colloquia 
 Archive 
 Kac Lectures 
 Kac Fellows 
 Dist. Quant. Lecture 
 Ulam Scholar 
 Colloquia 
 
 Jobs 
 Postdocs 
 CNLS Fellowship Application 
 Students 
 Student Program 
 Visitors 
 Description 
 Past Visitors 
 Services 
 General 
 
 History of CNLS 
 
 Maps, Directions 
 CNLS Office 
 T-Division 
 LANL 
 
Monday, October 29, 2007
09:00 AM - 10:00 AM
CNLS Conference Room (TA-3, Bldg 1690)

Seminar

A new second-order accurate, material order independent interface reconstruction method

S. P. Schofield
T-7

Volume of fluid (VOF) simulations track the fractional volumes of each material in a cell. When the interface position is required, it is reconstructed from the volume fraction data. The methods are robust and reliable for two material simulations. However, in cells containing more than two materials, traditional interface reconstruction methods rely on sequential processing of materials to create each material interface in turn. The final interface reconstruction depends on the order in which the materials are processed, a problem known as material order dependency. In some cases, improper material orderings can lead to materials being incorrectly located in a cell breaking up the interface. To fix this, we have developed a new second order accurate, material order independent, multi-material interface reconstruction scheme. The method correctly locates each material within the computational cell using only the volume fraction data, then reconstructs the material interfaces using a weighted Voronoi diagram whose cells match the required volumes. The interface is then smoothed in a material-order independent fashion. The method is completely general working for an arbitrary number of materials on arbitrary convex polygonal grids. It preserves straight lines and all the resulting pure material subcells are convex.