  Simple and robust algorithms are developed for compressible Euler equations
with the stiffened gas equation of state (EOS), representing gaseous mixtures
in thermal equilibrium and without chemical reactions. These algorithms use a
fully conservative approach in finite volume framework for approximating the
governing equations. Also, these algorithms used central schemes with
controlled numerical diffusion for this purpose. Both Mass fraction (Y ) and
$\gamma$ based models are used with RICCA and MOVERS+ algorithms to resolve the
basic features of the flow fields. These numerical schemes are tested
thoroughly for pressure oscillations and preservation of the positivity of mass
fraction at least in the first-order numerical methods. Several test cases in
both 1D and 2D are presented to demonstrate the robustness and accuracy of the
numerical schemes.
