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. Author manuscript; available in PMC: 2017 Nov 1.
Published in final edited form as: Ultrasound Med Biol. 2016 Aug 9;42(11):2662–2675. doi: 10.1016/j.ultrasmedbio.2016.06.018

Figure 2.

Figure 2

(a) Diagram of the numerical simulation setup. The incident lithotripter shock wave is 1 μs away from entering the computation domain at the beginning of the simulation. (b) Convergence plot of tensile stress time history at center of D = 4 mm spherical stone obtained by BEARCLAW finite volume code for h = 0.050, 0.033, 0.025 mm grid spacing. In the finite volume model the stone is modeled as a sharp jump in material properties over one cell width. For comparison, a structure-acoustic interaction simulation using the COMSOL finite element package is also presented. The structure-acoustic simulation matches normal displacement and stress between an acoustic domain (water) and an elastic domain (stone). Differences in the shear stress boundary condition between the two models can lead to differing waveform predictions, even though position and amplitude of peak stress is consistent.