Evaluation of the Lagrangian Marker Method in CTH: Taylor Impact
Final rept. Jul 2014-Jan 2015
ARMY RESEARCH LAB ABERDEEN PROVING GROUND MD WEAPONS AND MATERIALS RESEARCH DIRECTORATE
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A computational study was performed as an initial evaluation of the Lagrangian marker method recently implemented in the CTH shock physics code. A set of Taylor impact experiments served as the basis of this initial evaluation of the method. Numerical simulations of Taylor impact were performed with the CTH marker method, and the final shapes of the impacting cylinders were compared to experimental results. Additional CTH simulations were performed using the legacy Eulerian solver to isolate the influence of the CTH solver on the computational results. Finally, a set of Arbitrary Lagrangian-Eulerian ALE finite element simulations was performed for further comparison. The study revealed that the Lagrangian marker method reproduces the Taylor impact results with a degree of fidelity on par with the CTH legacy Eulerian and ALE methods. This study provides a critical first step toward the application of the CTH Lagrangian marker method to ballistic impact problems relevant to defense applications.
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