to be very realistic (though of course this also applies to the WL model). In our runs the thermal energy leads to rapid expansion and partial conversion of the thermal energy to kinetic energy as expected for Sedov-Taylor expansion [e.g., @Chevalier_1974]. Most of the results we discuss in this paper were carried out in 2D cylindrical symmetry, though we have done runs in 3D as well as a check on the effects of the 2D assumption.

For all of our runs, we use an explosion energy of $10^{51}$ ergs. As with the Sedov-Taylor solution, we expect the explosion energy to set the overall scale of the remnant but not to affect such things as the division of energy between thermal and kinetic forms. We use an ambient intercloud density of 0.25 cm$^{-3}$ and a temperature of $10^4$ K. These values are typical for the warm interstellar medium, though the temperature is perhaps slightly high for realistic heating and cooling balance. The exact value for the temperature should not have a significant affect on our results. The clouds are assumed to have a density of 25 cm$^{-3}$, which then leads to a temperature of 100 K to maintain pressure balance in 