We consider the large-time behavior of sign-changing solutions of inhomogeneous parabolic equations and systems. For example, for u t = u + u p + w x in R n × 0 T , we show the following: If n ≥ 3 and R n w x dx > 0 and 1 < p ≤ n/ n -2 , then all solutions blow up in finite time, while if p > n/ n -
Critical Fujita exponents for a class of nonlinear convection–diffusion equations
✍ Scribed by Wei Guo; Zejia Wang; Runmei Du; Lishu Wen
- Publisher
- John Wiley and Sons
- Year
- 2010
- Tongue
- English
- Weight
- 173 KB
- Volume
- 34
- Category
- Article
- ISSN
- 0170-4214
- DOI
- 10.1002/mma.1406
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✦ Synopsis
Communicated by M. Fila
In this paper, we establish the blow-up theorems of Fujita type for a class of homogeneous Neumann exterior problems of quasilinear convection-diffusion equations. The critical Fujita exponents are determined and it is shown that the exponents belong to the blow-up case under any nontrivial initial data.
📜 SIMILAR VOLUMES
In this paper we consider the heat equation u s ⌬ u in an unbounded domain t N Ž . ⍀;R with a partly Dirichlet condition u x, t s 0 and a partly Neumann condition u s u p on the boundary, where p ) 1 and is the exterior unit normal on the boundary. It is shown that for a sectorial domain in R 2 and
## Abstract A class of higher order compact (HOC) schemes has been developed with weighted time discretization for the two‐dimensional unsteady convection–diffusion equation with variable convection coefficients. The schemes are second or lower order accurate in time depending on the choice of the