SPIRAL SHOCKS IN ACCRETION DISCS

We perform two-dimensional numerical calculations of the tidal interac tion between the companion star and the disc around the primary in a c ataclysmic variable system with parameters appropriate for the eclipsi ng dwarf nova binary IP Peg. We show that a spiral shock pattern is in deed obtained. We find, however, that it is impossible to reproduce th e two-armed spiral that has been recently observed in IP Peg for reali stic discs.