Stabilized SPH-based simulations of impact dynamics using acceleration-corrected artificial viscosity
- 作者：Amit Shawa ; abshaw@civil.iitkgp.ernet.in ; D. Royb
- 关键词：Smooth particle hydrodynamics ; Artificial viscosity ; Acceleration correction ; Impact dynamics
- 刊名：International Journal of Impact Engineering
- 出版年：2012
- 期刊代码：82_0734743x
- 类别：et
- 出版时间：October, 2012
- 卷：48
- 期：Complete
- 页码：98-106
- 文件大小：625 K
摘要
Artificial viscosity in SPH-based computations of impact dynamics is a numerical artifice that helps stabilize spurious oscillations near the shock fronts and requires certain user-defined parameters. Improper choice of these parameters may lead to spurious entropy generation within the discretized system and make it over-dissipative. This is of particular concern in impact mechanics problems wherein the transient structural response may depend sensitively on the transfer of momentum and kinetic energy due to impact. In order to address this difficulty, an acceleration correction algorithm was proposed in Shaw and Reid (鈥淗euristic acceleration correction algorithm for use in SPH computations in impact mechanics鈥? Comput. Methods Appl. Mech. Engrg., 198, 3962-3974) and further rationalized in Shaw et聽al. (An Optimally Corrected Form of Acceleration Correction Algorithm within SPH-based Simulations of Solid Mechanics, submitted to Comput. Methods Appl. Mech. Engrg). It was shown that the acceleration correction algorithm removes spurious high frequency oscillations in the computed response whilst retaining the stabilizing characteristics of the artificial viscosity in the presence of shocks and layers with sharp gradients. In this paper, we aim at gathering further insights into the acceleration correction algorithm by further exploring its application to problems related to impact dynamics. The numerical evidence in this work thus establishes that, together with the acceleration correction algorithm, SPH can be used as an accurate and efficient tool in dynamic, inelastic structural mechanics.