Abstract: Conservative algorithms for internal interfaces are investigated for simulations of compressible inviscid flows by zonal methods. Analysis indicates that the conservative algorithm of interpolation type may be inconsistent with governing equations of the flows,and calculations show that this will cause severe numerical errors,and even ruin the stability and convergency of the computed solutions. Therefore, self-adaptive methods are proposed for internal interfaces and numerical examples are also presented.

Key words: compressible inviscid flow, conservative algorithm for internal interface, consistency, self adaptive method