This paper studies the Cauchy-Dirichlet problem associated with the equation b(u)t -div (IVu-K (b(u))el p-2 (Vu-K (b(u))e)) +g(x,u)--f(t,x). This problem arises in the study of some turbulent regimes: flows of incompressible turbulent fluids through porous media and gases flowing in pipes of uniform cross sectional areas. The paper focuses on the class of bounded weak solutions, and shows (under suitable assumptions) their stabilization, as c, to the set of bounded weak solutions of the associated stationary problem. The existence and comparison properties (implying uniqueness) of such solutions are also investigated. Key words, nonlinear parabolic equations, degenerate parabolic and elliptic equations, stabilization, existence and uniqueness of bounded weak solutions
Using Orlicz-Sobolev spaces and a variant of the Mountain-Pass Lemma of Ambrosetti-Rabinowitz we obtain existence of a (positive) solution to a semilinear system of elliptic equations. The admissible nonlinearities are such that the system is superlinear and subcritical. The Orlicz setting used here allows us to consider nonlinearities which are not (asymptotically) pure powers. Moreover, by an interpolation theorem of Boyd we find an elliptic regularity result in Orlicz-Sobolev spaces. A bootstrapping argument implies that the above mentioned solutions are classical.
Mathematics Subject Classification (2000). Primary 35J50; Secondary 46N20.
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