A Three-Dimensional Eulerian Code for Simulation of High-Speed Multimaterial Interactions
Final rept. Aug 2006-Aug 2011
IOWA UNIV CEDAR FALLS
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High speed material interactions may lead to large deformations followed by fragmentation. To simulate such problems in the Eulerian framework on a fixed Cartesian mesh, all interfaces free surfaces as well as interacting material interfaces are tracked as levelsets to resolve shocks and interfaces, a quad-tree adaptive mesh is employed. Collisions between embedded objects are resolved using an efficient collision detection algorithm and appropriate ineterfacial conditions are supplied. This paper addresses issues associated with the treatment of all interfaces as sharp entities by defining ghost fields on each side of the interface. Key issues of supplying interfacial conditions at the location of the interface and populating the ghost cells with physically consistent values during and beyond fragmentation events are addressed. An efficient parallel algorithm is used to handle computationally intensive three-dimensional problems. Numerous examples pertaining to impact, penetration, void collapse and fragmentation phenomena are presented along with careful benchmarking to establish the validity, the accuracy and the versatility of the approach.