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Speaker's Bio: 

Daniel Vavrick

Senior Engineer, Target Lethality and Systems Effectiveness Branch, Naval surface Warfare Center Dahlgren Division (NSWCDD).

Dan Vavrick earned his BS degree from the University of Minnesota in Aeronautical Engineering. He then served as a Combat Engineer in the Army. After discharge from the Army, he earned a MS and PhD at the University of Minnesota in Solid Mechanics with a minor in Mathematics and Fluid Mechanics. After graduation, he worked for Defense Systems Division of Honeywell, Inc, which was spun off as Alliant Tech, Inc. He left Alliant Tech for the Peace Corp to teach Science and Physics in Belize CA. After returning to the U.S. he worked in Reentry Systems at Naval Surface Weapons Center, White Oak Detachment, When that facility was bracked in 1996, he transferred to the Lethality and Weapons Effects Branch of the Naval Surface Warfare Center, Dahlgren Division where he still works.

Seminar Description: 

Zr and Air Reaction after Impact

This presentation will discuss preliminary coding developed to model the local reaction and deformation of zirconium (Zr) and air after impact using the CTH Hydrocode. This modeling is different from other modeling found in other reaction programs as it does not assume complete mixing, but rather computes the reaction locally in each model cell. Rather than using a burn rate to control the reaction, this coding requires, for the reaction to take place locally, an initiation condition satisfied and both reactants present. For the modeling discussed in this presentation the initiation condition is temperature, but could be changed to pressure or some other condition.