Time reversal of acoustic waves
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To run the model, open TR.pro with Gmsh.

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This model showcases the time reversal of acoustic waves.

The principle of time reversal is to use the reversibility of the wave equation in non dissipative media to back-propagate a signal on the source that first emitted it. Time Reversal Mirrors (TRM), designed by Matthias Fink and his team in the 1990's, are composed of a large number of transducers which can play alternatively the role of emitters and receivers. Associated to a numerical treatment module, they are able to record a signal, time reverse it, and back propagate it into the medium. The applications are numerous, such as submarine communication or kidney stone destruction.

Several analyses are predefined: time reversal in free space or with randomly-distributed obstacles between the source and the TRM, using either a monochromatic or a broadband signal.

Model developed by @bthierry