Stability analysis and finite volume element discretization for delay-driven spatio-temporal patterns in a predator-prey model

详细信息    查看全文

• 作者：Raimund Bü ; rger^a ; ^{rburger@ing-mat.udec.cl" class="auth_mail" title="E-mail the corresponding author} ; Ricardo Ruiz-Baier^b ; ^{ruizbaier@maths.ox.ac.uk" class="auth_mail" title="E-mail the corresponding author} ; Canrong Tian^c ; ^{tiancanrong@163.com" class="auth_mail" title="E-mail the corresponding author}
• 关键词：Spatio-temporal patterns ; Time delay ; Limit cycle ; Pattern selection ; Finite volume element discretization
• 刊名：Mathematics and Computers in Simulation
• 出版年：2017
• 出版时间：February 2017
• 年：2017
• 卷：132
• 期：Complete
• 页码：28-52
• 全文大小：2902 K

文摘

Time delay is an essential ingredient of spatio-temporal predator–prey models since the reproduction of the predator population after predating the prey will not be instantaneous, but is mediated by a constant time lag accounting for the gestation of predators. In this paper we study a predator–prey reaction–diffusion system with time delay, where a stability analysis involving Hopf bifurcations with respect to the delay parameter and simulations produced by a new numerical method reveal how this delay affects the formation of spatial patterns in the distribution of the species. In particular, it turns out that when the carrying capacity of the prey is large and whenever the delay exceeds a critical value, the reaction–diffusion system admits a limit cycle due to the Hopf bifurcation. This limit cycle induces the spatio-temporal pattern. The proposed discretization consists of a finite volume element (FVE) method combined with a Runge–Kutta scheme.