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. 2020 Jan 28;22(2):155. doi: 10.3390/e22020155

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© 2020 by the authors.

Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).

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Left: Snapshot of the stress pulse right before its 15th bouncing back from the boundary. Middle: Spacetime picture of the wave propagation. Bouncing back from free ends makes stress change sign. Right: Elastic energy, kinetic energy, and their sum as functions of time. Calculation done with $N = 200$ space cells and $C = 1$ .