In this article, we aim at solving a family of two-dimensional fractional-order Helmholtz equations by using the Laplace-Adomian Decomposition Method (LADM). The fractional-order derivatives, which we use in this investigation, follows the Liouville-Caputo definition. Our results based upon the LADM are obtained in series form that helps us in analyzing the analytical solutions of the fractional-order Helmholtz equations considered here. For illustration and verification of the analytical procedure using the LADM, several numerical examples and graphical representations are presented for the analytical solution of the fractional-order Helmholtz equations. The mathematical analytic procedure, which we have used here, has shown that the LADM is a fairly accurate and computable method for the solution of problems involving fractional-order Helmholtz equations in two dimensions. In an analogous manner, one can apply the LADM for finding the analytical solution of other classes of fractional-order partial differential equations. KEYWORDS Adomian decomposition method (ADM), fractional calculus, fractional-order Helmholtz equations, finite-difference method (FDM), Laplace-Adomian decomposition method (LADM), Liouville-Caputo derivative operator, Mittag-Leffler functions, Riemann-Liouville derivative operator MSC CLASSIFICATION 35J15; 35J70; 58J10; 58J20
| INTRODUCTION AND MOTIVATIONFractional calculus plays an important rôle in applied mathematics because of its various applications in modeling of many different physical phenomena occurring in science and engineering. The concept of a derivative, D α { f (x)} with nonintegerorder α, has improved the early development of the ordinary derivative with nonnegative integer values of the order α. In fact, in the development of fractional calculus, many noted mathematical scientists, such as Euler, Riemann, Liouville, Weyl, Leibniz, Fourier, Bernoulli, l'Hôpital, Wallis, and others, made remarkable contributions to this subject and other related research areas. In recent years, researchers in the mathematical, physical, and engineering sciences have made significant contributions toward the theory and applications of fractional calculus. Fractional calculus has many applications in the fields of (for example) viscoelasticity,