Hopf bifurcation and time periodic orbits in reaction-diffusion systems with pde2path - algorithms and applications
For researchers using pde2path, this provides validated algorithms for Hopf bifurcation and periodic orbits, but the contribution is incremental as it extends existing software.
This paper presents algorithms for Hopf bifurcation and periodic orbit continuation in the pde2path package, tested on reaction-diffusion systems and a distributed optimal control problem. The methods successfully compute Floquet multipliers and handle ill-posed problems via periodic Schur decomposition.
We describe the algorithms used in the Matlab continuation and bifurcation package pde2path for Hopf bifurcation and continuation of branches of periodic orbits in systems of PDEs in 1, 2, and 3 spatial dimensions, including the computation of Floquet multipliers. We first test the methods on three reaction diffusion examples, namely a complex Ginzburg-Landau equation as a toy problem, a reaction diffusion system on a disk with rotational waves including stable (anti) spirals bifurcating out of the trivial solution, and a Brusselator system with interaction of Turing and Turing-Hopf bifurcations. Then we consider a system from distributed optimal control, which is ill-posed as an initial value problem and thus needs a particularly stable method for computing Floquet multipliers, for which we use a periodic Schur decomposition. The implementation details how to use pde2path on these problems are given in an accompanying tutorial, which, together with all other downloads (function libraries, demos and further documentation) can be found at http://www.staff.uni-oldenburg.de/hannes.uecker/pde2path.