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The Free Lagrange code, which was used in the previous slide to simulate the collapse of a bubble far any solids, can also incorporate a solid target with real material properties, and be used to calculate the pressure in the water and gas, and stress in the solid (Aluminium in the example below). This can be used to assess the likelihood of a cavitation collapse causing damage to the solid. Later sections on this topic (available from next page) show how this might be applied to the acoustic emissions when kidney and gall stone subjected to lithotripter pulses, in order to monitor lithotripter focusing and stone fragmentation.

The Free Lagrange code, which was used in the previous slide to simulate the collapse of a bubble far any solids, can also incorporate a solid target with real material properties, and be used to calculate the pressure in the water and gas, and stress in the solid (Aluminium in the example below). This can be used to assess the likelihood of a cavitation collapse causing damage to the solid. Later sections on this topic (available from next page) show how this might be applied to the acoustic emissions when kidney and gall stone subjected to lithotripter pulses, in order to monitor lithotripter focusing and stone fragmentation.



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