1,593 research outputs found
A Finite-Volume Method for Nonlinear Nonlocal Equations with a Gradient Flow Structure
We propose a positivity preserving entropy decreasing finite volume scheme
for nonlinear nonlocal equations with a gradient flow structure. These
properties allow for accurate computations of stationary states and long-time
asymptotics demonstrated by suitably chosen test cases in which these features
of the scheme are essential. The proposed scheme is able to cope with
non-smooth stationary states, different time scales including metastability, as
well as concentrations and self-similar behavior induced by singular nonlocal
kernels. We use the scheme to explore properties of these equations beyond
their present theoretical knowledge
Well-posedness and gradient blow-up estimate near the boundary for a Hamilton-Jacobi equation with degenerate diffusion
This paper is concerned with weak solutions of the degenerate viscous
Hamilton-Jacobi equation with
Dirichlet boundary conditions in a bounded domain ,
where and . With the goal of studying the gradient blow-up
phenomenon for this problem, we first establish local well-posedness with
blow-up alternative in norm. We then obtain a precise gradient
estimate involving the distance to the boundary. It shows in particular that
the gradient blow-up can take place only on the boundary. A regularizing effect
for is also obtained.Comment: 20 pages 1 figur
Single point gradient blow-up on the boundary for a Hamilton-Jacobi equation with -Laplacian diffusion
We study the initial-boundary value problem for the Hamilton-Jacobi equation
with nonlinear diffusion in a two-dimensional
domain for . It is known that the spatial derivative of solutions may
become unbounded in finite time while the solutions themselves remain bounded.
We show that, for suitably localized and monotone initial data, the gradient
blow-up occurs at a single point of the boundary. Such a result was known up to
now only in the case of linear diffusion (). The analysis in the case
is considerably more delicate
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