Can some one know a book or how to use differincig schemes in space (upwind, central,hybrid...) and differincig schemes in time (explicit, implicit...) to discretise a transient convection-diffusion equation where the density is not a constant and the viscosity too. I work with PHOENICS code and I write equations used in PHOENICS; If thre is some one who work in the subject he can contact me.

(1). Check the Books online section and David Creech's listing. (2). Look at the S.V. Patankar's cfd book.