The authors thank Graf and Rienäcker for their kind words. It is encouraging to learn that the algorithm laid out earlier [1] and elaborated in this paper [2] has been independently and successfully implemented by others on the basis of those descriptions alone. It is also important to note that this additional implementation made use of their own solid and fluid finite elements not reported in either paper noted (or in Ref. [3]).

Meanwhile, Gaman [4] has now kindly clarified the experimental loading arrangement utilized by Gaman et al. [5] and incompletely described in our numerical example [2]. As shown in Fig. 1, an adjustable counterbalance was employed to enable a relatively heavy steel sphere to exert a relatively light force while falling under gravity.

The numerical example of this paper [...

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