University of Tabriz Computational Methods for Differential Equations 2345-3982 14 1 2026 11 01 Numerical simulation of a nonlinear system of space-fractional Klein-Gordon-Zakharov equations using the Fourier spectral method 188 200 19470 10.22034/cmde.2025.65052.2970 EN Zohreh Yaghoobloo Department of Mathematics, Ahvaz branch, Islamic Azad University, Ahvaz, Iran. Sedigheh Toubaei Department of Mathematics, Ahvaz branch, Islamic Azad University, Ahvaz, Iran. Mehdi Jalalvand Department of Mathematics, Faculty of Mathematical Sciences and Computer, Shahid Chamran University of Ahvaz, Ahvaz, Iran. Jafar Esmaily Department of Mathematics, Ahvaz branch, Islamic Azad University, Ahvaz, Iran. Safiyeh Mohammadian Department of Mathematics, Osku Branch, Islamic Azad University, Osku, Iran. Journal Article 2024 12 16 An accurate and efficient numerical approach for the nonlinear space-fractional Klein-Gordon-Zakharov (KGZ) system of equations incorporating the fractional Laplacian operator is proposed in this study. The method is designed to preserve both mass and energy, which is crucial for accurately solving such complex systems. The spatial discretization is carried out using the Fourier spectral method. In contrast, temporal discretization is achieved through the fourth-order exponential time-differencing Runge-Kutta (ETDRK4) technique, ensuring both efficiency and stability. We prove the convergence of the proposed method, establishing a theoretical foundation for its application. To assess the efficiency and versatility of the proposed method, we report on a series of numerical simulations. The outcomes of these simulations are displayed in tables and graphs, illustrating the performance of the method regarding the approximation error, convergence order, and execution time for various fractional values. https://cmde.tabrizu.ac.ir/article_19470_9511721492d2f910dfd3b3595941a44c.pdf