# American Institute of Mathematical Sciences

December  2006, 16(4): 783-842. doi: 10.3934/dcds.2006.16.783

## A concept of solution and numerical experiments for forward-backward diffusion equations

 1 Dipartimento di Matematica, Università di Roma 'Tor Vergata', 00133, Roma 2 Dipartimento di Matematica Pura e Applicata, Università de L’Aquila, I-67100 L’Aquila, Italy 3 Dipartimento di Matematica Pura e Applicata, Università de L'Aquila, I-67100 L'Aquila

Received  January 2006 Revised  June 2006 Published  September 2006

We study the gradient flow associated with the functional $F_\phi(u)$ := $\frac{1}{2}\int_{I} \phi(u_x)~dx$, where $\phi$ is non convex, and with its singular perturbation $F_\phi^\varepsilon(u)$:=$\frac{1}{2}\int_I (\varepsilon^2 (u_{x x})^2 + \phi(u_x))dx$. We discuss, with the support of numerical simulations, various aspects of the global dynamics of solutions $u^\varepsilon$ of the singularly perturbed equation $u_t = - \varepsilon^2 u_{x x x x} + \frac{1}{2} \phi''(u_x)u_{x x}$ for small values of $\varepsilon>0$. Our analysis leads to a reinterpretation of the unperturbed equation $u_t = \frac{1}{2} (\phi'(u_x))_x$, and to a well defined notion of a solution. We also examine the conjecture that this solution coincides with the limit of $u^\varepsilon$ as $\varepsilon\to 0^+$.
Citation: G. Bellettini, Giorgio Fusco, Nicola Guglielmi. A concept of solution and numerical experiments for forward-backward diffusion equations. Discrete & Continuous Dynamical Systems - A, 2006, 16 (4) : 783-842. doi: 10.3934/dcds.2006.16.783
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