Title: Multimaterial Interface Reconstruction* Speaker: M. J. Shashkov, Los Alamos National Laboratory Date/Time: Tuesday, December 13, 2005, 10:00-11:00 am Location: Building 980, Room 95 (Sandia NM) Brief Abstract: Lagrangian methods for flow simulations automatically keep track of material interfaces whereas Eulerian and Arbitrary-Lagrangian-Eulerian (ALE) methods must incorporate special procedures to track or infer interfaces contained in mixed cells. In the first part of this talk we focus on interface reconstruction methods in which an approximate interface is recreated in each cell using volume fraction information in the cell and its neighbors. It addresses two important but often ignored issues in such procedures. The first issue is the accurate recovery of the interface while avoiding the creation of holes and fragments. Creation of such artifacts by the interface reconstruction procedure independent of the physical processes is obviously undesirable leading to a loss of accuracy and a divergence of the simulation from reality. The second important subject is the treatment of interfaces in mixed cells with three or more materials. Many existing procedures recover only some interface topologies correctly and that too, only if the materials are processed in a specific order. Therefore, it is very important to devise interface reconstruction algorithms that are order-independent. Results of the interface reconstruction procedure developed with these issues in mind will be presented. In the second part of this talk we describe a new Moments of Fluid Method (MoF) for interface reconstruction. In the MoF method, in addition to the volume fractions we use information about position of centroids of each material. Results of interface reconstruction using MoF are presented. *R.V. Garimella, V. Dyadechko, M.J. Shashkov, B.K. Swartz CSRI POC: Allen C. Robinson, (505) 844-6614 |