What formulas to use to model a shock-wave propagation?

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I'm a first year physics student. I want to make a simulation that models the Tunguska explosion. I want to specify the energy and position of the blast in air and then to somehow model the propagation of that shock-wave. Where can I find the equations that could help me model the distribution and propagation of the shock-wave (I presume that it would be sufficient to track the change of the scalar field representing air pressure?).