Calculations are described that explore hydrodynamic processes predicted to arise during the nova outburst on the basis of a model proposal by Rose. Two mechanisms for rapid mass loss are studied; (1) a direct shock-wave ejection mechanism, and (2) rapid mass loss resulting from pulsational instability. It is concluded that the direct shock-wave ejection mechanism is probably not the sole cause of mass loss in novae because it requires very high rates of nuclear energy generation and does not provide a satisfactory explanation for the velocity distributions of the ejected mass and the relatively long timescales associated with many outbursts. The dissipation of pulsationally produced shock waves appears to be a plausible means of producing considerable surface heating and an extended envelope. However, the calculations do not show how this extended envelope is ejected. Although the theory under consideration provides a satisfactory explanation for the circumstances of occurrence and maximum visual luminosity of novae, further work is needed to explain the velocity of the ejected matter.