  We numerically test the mode-coupling model (Lubow 1991a) of tidal
instability in SU UMa systems. So far, all numercial models confirming it have
been based on SPH codes and isothermal equation of state. In our paper we
present Eulerian models, using both isothermal approximation and the full
energy equation. We also investigate influence of different ways of mass
transfer. While isothermal models behave similarly to SPH simulations, the
behaviour of models with full energy equation is quite different, and the
mode-coupling model is not confirmed in this case.
