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. We consider scalar conservation laws with the spatially varying flux H(x)f(u) + (1 −H(x))g(u), where H(x) is the Heaviside function and f and g are smooth nonlinear functions. Adimurthi, Mishra, and Veerappa Gowda [J. Hyperbolic Differ. Equ., 2 (2005), pp. 783–837] pointed out that such a conservation law admits many L1 contraction semigroups, one for each so-called connection (A,B). Here we define entropy solutions of type (A,B) involving Kružkov-type entropy inequalities that can be adapted to any fixed connection (A,B). It is proved that these entropy in-equalities imply the L1 contraction property for L ∞ solutions, in contrast to the “piecewise smooth” setting of Adimurthi, Mishra, and Veerappa Gowda. For a fixed connection, these entropy inequal-ities include a single adapted entropy of the type used by Audusse and Perthame [Proc. Roy. Soc. Edinburgh Sect. A, 135 (2005), pp. 253–265]. We prove convergence of a new difference scheme that approximates entropy solutions of type (A,B) for any connection (A,B) if a few parameters are varied. The scheme relies on a modification of the standard Engquist–Osher flux, is simple as no 2×2 Riemann solver is involved, and is designed such that the steady-state solution connecting A to B is preserved. In contrast to most analyses of similar problems, our convergence proof is not based on the singular mapping or compensated compactness methods, but on standard spatial variation estimates away from the flux discontinuity. Some numerical examples are presented. Key words. Engquist–Osher scheme, conservation law with discontinuous flux, flux connection, adapted entropy, entropy solution of type (A,B) AMS subject classifications. 35L65, 65M06 DOI. 10.1137/07069314

An Engquist–Osher-Type Scheme for Conservation Laws with Discontinuous Flux Adapted to Flux Connections