Selkov’s Dynamic System of Fractional Variable Order with Non-Constant Coefficients

The article uses an approach based on the triad model-algorithm-program. The model is a nonlinear dynamic Selkov system with non-constant coefficients and fractional derivatives of the Gerasimov-Caputo type. The Adams-Bashforth-Multon numerical method from the predictor-corrector family of methods is selected as an algorithm for studying this system. The ABMSelkovFracSim software package acts as a program, in which a numerical algorithm with the ability to visualize the research results was implemented: to build oscillograms and phase trajectories. Examples of the ABMSelkovFracSim software package operation for various values of the model parameters are given. It is shown that with an increase in the values of the parameter responsible for the characteristic time scale, regular and chaotic modes are observed. Further in the work, bifurcation diagrams were constructed, which confirmed this. Aperiodic modes were also detected and a singularity was revealed.