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wave propagation

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i'd like to impliment a top down system that allows waves (ripples/explosions/sound waves) to propagate (at least seemingly) realistically around corners. does anyone know how something like this could be implimented? i was thinking of something like the grid system in geometry wars, but that sounds very computationally intensive.

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You need to implement a diffraction simulator. I would suggest modelling the corner as a directional secondary source with a spread related to the width of the gap the wave is being diffracted through; look up Huygens' Wavelets or diffraction in your favourite search engine.

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For waves in fluids, a 2D NSE solver with a obstruction grid would do fine (use the pressure value at a given point for height when rendering).

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