• MANISH GOYAL

Articles written in Pramana – Journal of Physics

• A reliable algorithm for fractional Bloch model arising in magnetic resonance imaging

Magnetic resonance imaging (MRI) is used in physics, chemistry, engineering and medicine to study complex materials. In this paper, numerical solution of fractional Bloch equations in MRI is obtained using fractional variation iteration method (FVIM) and fractional homotopy perturbation transform method (FHPTM). Sufficient conditions for the convergence of FVIM and its error estimate are established. The obtained results are comparedwith the existing as well as recently developed methods and with the exact solution. The obtained numerical results for different fractional values of time derivative are discussed with the help of figures and tables. Figures are drawn using the Maple package. Test examples are provided to illustrate the accuracy and competency of the proposed schemes.

• Numerical simulation for time-fractional nonlinear coupled dynamical model of romantic and interpersonal relationships

The objective of this paper is to study the nonlinear coupled dynamical fractional model of romantic and interpersonal relationships using fractional variation iteration method (FVIM) and fractional homotopy perturbation transform method (FHPTM). These procedures inspect the dynamics of love affairs among couples. Sufficient conditions for their convergence and error estimates are established. Obtained results are compared with the existing and recently developed methods. It is interesting to observe that these methods also work for those fractional models that do not have an exact solution. Results for different fractional values of time derivative are discussed with the help of figures and tables. Figures are drawn using Maple package. Test examples are provided to illustrate the accuracy and competency of the proposed schemes. Results divulge those schemes that are attractive, accurate, easy to use and highly effective.

• A new efficient technique for solving fractional coupled Navier–Stokes equations using q-homotopy analysis transform method

In this paper, a solution of coupled fractional Navier–Stokes equation is computed numerically using the proposed q-homotopy analysis transform method (q-HATM), and the solution is found in fast convergent series.The given test examples illustrate the leverage and effectiveness of the proposed technique. The obtained results are demonstrated graphically. The present method handles the series solution in a large admissible domain in an extreme manner. It offers us a modest way to adjust the convergence region of the solution. Results with graphs explicitly reveal the efficiency and capability of the proposed algorithm.

• Numerical simulation of space-fractional Helmholtz equation arising in seismic wave propagation, imaging and inversion

In this paper, a reliable numerical scheme, the q-fractional homotopy analysis transform method (q-FHATM), is proposed to examine the Helmholtz equation of fractional order arising in seismic wave propagation, imaging and inversion. Sufficient conditions for its convergence and error estimates are established. The q-FHATMprovides a solution in a rapidly convergent series. Results for different fractional values of space derivatives are compared with the existing methods and discussed with the help of figures. A proper selection of parameters yields approximations identical to the exact solution. Parameter $\bar{h}$ offers an expedient way of controlling the region of convergence of the solution. Test examples are provided to illustrate the accuracy and competency of the proposed scheme. The outcomes divulge that our scheme is attractive, user-friendly, reliable and highly effective.

• Numerical simulation of time-dependent influenza model with Atangana–Baleanu non-integer order derivative in Liouville–Caputo sense

The goal of this research is to find a solution for controlling influenza evolution and its transmission. In the present paper, a new time-dependent nonlinear susceptible–infected–recovered–cross-immune model is introduced with arbitrary order Atangana–Baleanu derivative, and its solution is found using the reliable hybrid computational technique known as homotopy perturbation method via Laplace transform. The arbitrary order derivative is taken in the Liouville–Caputo sense. The outcomes of different parameters on various populations with time are displayed through graphical results. The existence and uniqueness of the solution of the presented model is discussed using Picard–Lindelof approach. Convergence analysis is also shown. The negligible error in the succeeding iterates shows the accuracy of the homotopy perturbation transform method (HPTM) scheme. The plots and the obtained results show activeness, effectiveness and suitability of HPTM scheme in solving this fractional model.

• # Editorial Note on Continuous Article Publication

Posted on July 25, 2019