  In this work, we study the causal relations between a localised energy
release and a remote prominence oscillation, where the prominence has a
realistic thread-like structure. We used an open source magnetohydrodynamic
(MHD) code known as MPI-AMRVAC to create a multithreaded prominence body. We
introduced an additional energy source from which a shock wave originates,
thereby inducing prominence oscillation. We studied two cases with different
source amplitudes to analyze its effect on the oscillations. Our results show
that the frequently used pendulum model does not suffice to fully estimate the
period of the prominence oscillation, in addition to showing that the influence
of the source and the thread-like prominence structure needs to be taken into
account. Repeated reflections and transmissions of the initial shock wave occur
at the specific locations of multiple high-temperature and high-density
gradients in the domain. This includes the left and right transition region
(TR) located at the footpoints of the magnetic arcade, as well as the various
transition regions between the prominence and the corona (PCTR). This results
in numerous interferences of compressional waves. They contribute to the
restoring forces of the oscillation, causing the period to deviate from the
expected pendulum model, in addition to leading to differences in attributed
damping or even growth in amplitude between the various threads. Along with the
global longitudinal motion that result from the shock impact, small-scale
transverse oscillations are also evident. Multiple high-frequency oscillations
represent the propagation of magnetoacoustic waves. The damping we see is
linked to the conversion of energy and its exchange with the surrounding
corona. Our simulations demonstrate the exchange of energy between different
threads and their different modes of oscillation.
