Generalized Method for One-Way Coupling of CTH and Lagrangian Finite- Element Codes With Complex Structures Using the Interdisciplinary Computing Environment

摘要

In the past, CTH (a finite volume, shock physics code) has been coupled with different Lagrangian finite-element codes like Pronto3D and LS- Dyna to solve blast-structure interaction problems. In many situations, a two- way coupling of these codes is unnecessary. Specifically, when the deformation of the structure has little impact on the developing blast, a one-way coupling is sufficient. Unfortunately, when the structure is complex, and particularly when the model contains shell elements, accurately generating the load curves for the finite-element input can be difficult. A generalized method for generating the necessary load curves for the finite-element input from CTH has been developed at the U.S. Army Research Laboratory by using the Interdisciplinary Computing Environment. This method accurately represents the finite-element model's geometry on the Eulerian mesh and can be applied to any code with a pressure-vs.-time element loading capacity. Using this method, an accurate representation of the finite-element model can be inserted into the CTH mesh even when the model contained shell elements. An example problem of a land mine interacting with a complex vehicle structure is presented in the report.