Computational and Stability Analysis of MHD Time-Dependent Thermal Reaction Flow Impinging on a Vertical Porous Plate Enclosing Magnetic Prandtl Number and Thermal Radiation Effect

Abstract

The aim of the present study is to investigate magnetohydrodynamic (MHD) time-dependent flow past a vertical slanted plate enclosing heat and mass transmission (HMT), induced magnetic field (IMF), thermal radiation (TR), and viscous and magnetic dissipation characteristics on a chemical reaction fluid flow. A boundary layer estimate is taken to develop a movement that exactly captures the time-dependent equations for continuity, momentum, magnetic induction, energy, concentration, generalized Ohm’s law, and Maxwell’s model. Partial differential equations designate the path occupied by the magnetized fluid as it passes through the porous matrix. In addition, a heat source is included in the model in order to monitor the flow nature in the current study. Because of the nonlinearity in the governing equations, the mathematical models are computed numerically by RK4 method. Further, tables and graphs are depicted to elucidate the physical influence of important factors on the flow characteristics. The novelty of the present work is investigating the irregular heat source and chemical reaction over the porous rotating channel. It is perceived that high thermal radiation occurs with increases in temperature and concentration. It is witnessed that the IMF effect is diminished for large values of magnetic Prandtl number (MPN). It is also analyzed that with increasing the heat source factor, the velocity of the fluid enhances. For stability analysis, the existing effort is compared with the published work and good agreement is found. Moreover, the residue error estimation confirms our solution.

1. Introduction

The relevance of usual convection with TR has improved significantly through the last decade owing to its prominence in countless real-world applications. Radioactive implications on the movement become important when spontaneous convection flows happen at high temperatures. For space technology and engineering activities that take place at high temperatures, the impact of radiation on the free convection movement is significant. Olanrewaju et al. [1] conducted an investigation into the boundary layer movement of nanofluids (NF) through a moving plate in the vicinity of radiation. The mutual influence of thermal energy and magnetic fields on the movement of NF that transport heat and mass through a nonlinear stretched surface was inspected by Poornima et al. [2]. The consequences of heat radiation on the movement of mono phase nanofluid across an infinitely vertically plate was lately examined by Turkyilmazoglu and Pop [3]. Thermal radiation is produced by an object with a temperature ranging from 0.1 to 100 m. The electromagnetic waves emitted by this heat radiation may have a significant impact on the fluid movement. Many scanners in the medical industry emit thermal radiation into the human body in order to detect abnormalities in the body based on temperature changes. Gireesha et al. [4] explored the Jeffrey NF movement under the inspiration of magnetohydrodynamics over a stretched sheet. Sohail et al. [5] focused on the effects of radiation and Joule heating on non-Newtonian fluid flow and its applications. Kejela et al. [6] found analytical solutions for the flow under Eckert number, thermal radiation, and slip near the boundary. Over a vertical plate, an approximate explanation for the boundary layer flow was obtained with the effect of heat radiation and buoyance force by Kejela and Firdi [7]. Song et al. [8] employed the shooting technique for investigation of nanofluids with non-linear RD. Under the influence of gyrotactic microorganisms and magnetic dipole, Ijaz et al. [9] compared their results with prior work on ferromagnetic Jeffrey fluid. Muhammad et al. [10] compared the bvp4c and shooting approaches for obtaining the solution for flow on nanofluids under nonlinearity of thermal radiation. To evaluate the properties of surface roughness and TR on hybrid nanofluids, Wakif et al. [11] used the numerical model. Through a computational approach, Kumar et al. [12] focused on the radiation effect on nanofluid, combining a magnetic field and viscous dissipation.

In cooling processes, research on heat production or absorption implications is crucial. However, it might be challenging to precisely predict inner heat generation or absorption, certain straightforward mathematical approaches can explain its typical performance in the majority of physical conditions [13,14]. Ahmed et al. [15] studied the impact of heat generation and absorption on BLF using single-phase nanofluid movement through a stretched tube. The impacts of heat generation and absorption on the mix convection movement of a nanofluid across an angle plate were quantitatively examined most recently by Akilu and Narahari [16]. Kumar et al. [17] examined the effects of heat generation and absorption source/sink and hall currents using magnetohydrodynamic flow in a vertical network. Nagaraju et al. [18] used an analytical approach to uniformly investigate the flow in a vertically slanted cylinder under the influence of heat source/sink factors. Implication of heat generation on unsteady mix convective movement across a coaxial cylinder full of porous matrix using the HAM approach was examined by Yusuf and Gambo [19]. Dawar et al. [20] inspected the magnetohydrodynamic NF with chemically reactions. Shaheen et al. [21] examined the influence of non-uniform heat effect and Joule degeneracy on three-dimensional Eyring–Powell fluid movements on a stretched surface. Thumma et al. [22] deliberated the Jeffrey flow model over vertical channel with stimulus of TR and heat source/sink.

The research on magnetohydrodynamics has significant implications for astronomy, geology, the pharmaceutical industry, and mechanical engineering. Some significant applications of the Lorentz force include magnetohydrodynamic generators, boundary layer control, bearings, and pumps [23]. Many researchers are motivated to the practical uses of fluid motion and heat transmission via a porous media in multiple technical and mechanical domains, in addition to MHD flows. Some of its widely used applications include gas turbines, thermal and cooling occurrences, heat separator design, catalysis-related reactors, and the automotive industry. Additionally, the fluid movement patterns in permeable media are helpful for a variety of processes, including fermentation, water motion in reservoirs, hydrological systems, aquifer contamination, and much more. The primary research on flow in permeable media is split into two fronts. The first is practical research, which covers topics such as physics, engineering, hydrology, etc. The latter is a theoretical investigation in which many intricate and practical flows and their mathematical representations are suggested and debated. Numerous scientists and academics have made important observations and provided some quantitative answers to these mathematical connections. The issue becomes more practical and realistic when the impact of MHD on flow via porous material is taken into account. Magnetized boundary layer movement of a stretched surface immersed in a permeable matrix was studied by Ibrahim and Shankar [24]. Priyadharshini et al. [25] investigated the gradient descent machine learning regression for MHD flow by metallurgy process. Hasen and Abdulhadi [26] used analytical techniques to solve the magnetized Rabinowitch fluid flow in a porous cilia channel. Under the impact of mass and heat transmission, the MHD NF movement on a stretching surface was numerically scrutinized by Elazem [27]. Salahuddin et al. [28] used the shooting approach to analyze MHD Williamson fluid having changing viscosity characteristics. By using blood as base fluid in a rectangular domain, copper and copper oxide hybrid NF was explored by Alghamdi et al. [29]. Taiwo et al. [30] investigated the isothermal and isoflux unsteady flow through a tube using the Laplace transformation. With non-linear thermal radiation, Gupta et al. [31] investigated Williamson NF. The flow phenomena are solved using applicable similarity transformations.

In the fields of technology and applied science, including filtration, environmental mechanics, and chemical science, the porosity idea is used. There are differences between intercrystalline and intergranular porosity in the cavern and molecular interstices. As a result, both academic study and processing technologies have given porous media a lot of attention. The rigid matrix, porous structure, and matrix permeability are the primary determinants of the properties of the medium, including permeability, thermal conductivity, and thermal capacitance. In the study and design of heat transmission and heat exchanging devices, porous media and transfer are becoming increasingly appealing. When a fluid moves through a porous medium, it originates into touch with its sizable surface area and the fluid’s rate of heat exchange is accelerated due to the medium’s convoluted structure. Additionally, porous media are used to increase fluid thermal resistivity and to calm or heat liquids. Ahmad and Pop [32] investigated how suction affected the buoyancy phenomena caused by NF implanted in a permeable medium on a flat vertical plate, and established double solutions. Sheikholeslami et al. [33] examined the effects of the electromagnetic field on the liquid flow containing NF implanted in a source of porous medium. They investigated NF in porous media via the cavity using the KKL method and Darcy models. A study reported by Bakar et al. [34] examined mixed convection radiation flow across a tube comprising NF generated in a porous medium. Applying the Brinkman–Darcy model to study the entropy and slip characteristics of heat transport in a closed form was developed by Turkyilmazoglu [35]. More information on the studies of nanofluids are provided in [36,37].

It is witnessed that chemical processes have significant influence in heat transfer in various branches of science and nanotechnology, such as solar collectors, nuclear reactor safety, metallurgy, and chemical engineering [38,39,40]. Hayat et al. [41] scrutinized the chemical processes for Maxwell fluid. Using the BLF, Kameswaran et al. [42] inspected the chemical processes over a stretchable sheet filled with nanofluid. Uddin et al. [43] numerically investigated the magnetized convective BLF with slip effect over a stretching porous plate with chemical processes. The analytical solution was obtained for free convective flow (FCF) over a horizontal surface filled with nanofluid [44]. Most recently, Srinivas et al. [45] considered the viscoelastic fluid over a stretching pipe with chemical processes. Similarly, the MHD FCBLF with chemical reaction of NF through a normal sheet was explored by Uddin et al. [46]. Wijayanta and Agung [47] investigated the conjugate heat transmission for a heat exchanger using radial basis function. Makarim [48] analysed the Marangoni convection using the thermosolute and absorptive aqueous LiBr solution. Some recent investigations about the present study are given in [49,50,51,52]. Similarly, Sodeifian et al. [53] investigated the molecular dynamics analysis of epoxy/clay nanomaterials. The study about the non-linear rheology of polymer melts, governing equations, polymer blends, shear movement, and sliding plate rheometers can be found in the book [54].

Therefore, motivated by the aforementioned research, the current study examines the free convective BLF over a porous surface enclosing heat and mass transportation, thermal conductivity, heat source/sink, magnetic Prandtl number, and viscous and magnetic dissipation properties. The theoretical model is designed for the proposed investigation, and after utilizing the similarity transformations, it is numerically solved by the ND-Solve method. The effect of emerging factors on the flow characteristics is depicted graphically and elaborated. Temperature reveals a growth in performance by increasing the Brownian motion (BM), thermophoresis factor (TF), thermal conductivity factor (TCF), and radiation factor (RF). Lastly, the present work is validated with previous work [55] and good correlations are found. The stability analysis is confirmed by comparing with the published work and the residue error.

2. Mathematical Modeling

The current research examines the influences of MHD and thermal diffusion on the heat and mass transportation implications of an electrically conducting time-dependent viscous fluid. The fluid travels across a perpendicular plate that is electrically non-conductive under the assumption that the fluid density is constant. The fluid movement is taken towards the x-axis across the plate, whereas the y-axis is normal to it. A magnetic field is disseminated consistently along the y-axis. Flow fluid model is given in Figure 1.

The model equations, such as continuity, momentum, magnetic induction, energy, concentration, generalized Ohm, and Maxwell law, are given by [48,52,55]

$$\nabla ·\overrightarrow{q}=0$$

(1)

$$\frac{\partial \overrightarrow{q}}{\partial t}+\left(\overrightarrow{q}·\nabla \right)\overrightarrow{q}=\overrightarrow{F}-\frac{1}{\rho }\nabla p+v{\nabla }^2+\frac{1}{\rho }\left(\overrightarrow{J}\times \overrightarrow{H}\right)$$

(2)

$$\frac{\partial \overrightarrow{H}}{\partial t}+\left(\overrightarrow{H}·\nabla \right)\overrightarrow{H}=\left(\overrightarrow{H}·\nabla \right)\overrightarrow{q}+\frac{1}{\rho {\mu }_e}{\nabla }^2\overrightarrow{H}$$

(3)

$$\frac{\partial T}{\partial t}+\left(\overrightarrow{q}·\nabla \right)T=\frac{\kappa }{\rho C_p}{\nabla }^{2}T+\frac{J}{\rho C_p\sigma {\mu }_e^2}+\frac{1}{\rho C_p}\phi$$

(4)

$$\frac{\partial C}{\partial t}+\left(\overrightarrow{q}·\nabla \right)C=D_m{\nabla }^{2}C+\frac{D_m{\kappa }_T}{T_m}{\nabla }^{2}T$$

(5)

$$\overrightarrow{J}=\sigma \left(\overrightarrow{E}+\overrightarrow{q}\times \overrightarrow{B}\right)-\frac{\sigma }{e{n}_e}\left(\overrightarrow{J}\times \overrightarrow{B}\right)+\frac{\sigma }{e{n}_e}\nabla P_e$$

(6)

$$\nabla \times \overrightarrow{B}={\mu }_e\overrightarrow{J},\nabla \times \overrightarrow{E}=0,\nabla \times \overrightarrow{H}=0$$

(7)

At $t\ne 0,$ the temperature and concentration are enhanced to $T_w(\succ T_{\infty })$ and ${\mathrm{C}}_w(\succ C_{\infty })$ respectively as shown in Figure 1.

The succeeding suppositions are made in the recommended work:

• From the accustomed Boussinesq’s approximation, the physical proper ties of the liquid cosidered are constants and body force terms include density variation with temperature.
• If the liquid flow is at high speed, the energy equation contains terms of viscous dissipation and Joule heating.
• Between foreign mass and fluid there is no chemical reaction reflected. To notice the Soret number’s effect on the liquid flow, the concentration of foreign mass is believed to be very high.

Incorporating the above theories, the equations of the flow phenomenon result in being nonlinear and coupled, and are represented below:

The continuity equation

$$u_x+{\nu }_y=0$$

(8)

The momentum equation [55]

$$u_t+u{u}_t+v{u}_y=g\beta \left(T-T_{\infty }\right)+g\beta \left(C-C_{\infty }\right)+v{u}_{yy}+\frac{{\mu }_e{H}_0}{\rho }{\left(H_x\right)}_y$$

(9)

The magnetic induction equation [52,55]

$${\left(H_x\right)}_t+u{\left(H_x\right)}_x+v{\left(H_x\right)}_y=H_x{u}_x+H_x{u}_y+\frac{1}{\sigma {\mu }_e}{\left(u_x\right)}_{yy}$$

(10)

The energy equation [55]

$$T_t+u{T}_x+v{T}_y=\frac{\kappa }{\rho C_p}{T}_{yy}\frac{{\partial }^2}{{\partial }^2}+\frac{1}{\sigma \rho C_p}{\left({\left(H_x\right)}_y\right)}^2+\frac{v}{C_p}{\left(u_y\right)}^2-\frac{Q_0}{\rho C_p}\left(T-T_{\infty }\right)$$

(11)

The concentration equation [55]

$$C_t+u{C}_{\overrightarrow{x}}+v{C}_y=D_m{C}_{yy}+\frac{D_m{\kappa }_T}{T_m}{T}_{yy}-K_0(C-C_{\infty })$$

(12)

Radiation term is taken from Rosseland’s approximation [30] as ${\mathrm{q}}_{\mathrm{r}}=\left(\raisebox{1ex}{$4\mathsf{\sigma }$}\!\left/ \!\raisebox{-1ex}{$3\mathrm{k}$}\right.\right){\left({\mathrm{T}}^4\right)}_{ \overrightarrow{\mathrm{y}}}$, where $\mathsf{\sigma }$ is the Stefan–Boltzmann constant and $\mathrm{k}$ is the mean absorption coefficient. Temperature is assumed to have variations in the interior of the flow, so ${\mathrm{T}}^4$ that can be developed with the help of Taylor series. ${\mathrm{T}}^4$ is expanded in terms of ${\mathrm{T}}_{\infty }$ temperature and ignoring higher order terms provided that ${\mathrm{T}}^4=4{\mathrm{T}}^3\mathrm{T}-3{\mathrm{T}}_{\infty }^4,$ so that Equation (11) becomes [55]

$$T_t+u{T}_x+v{T}_{\overrightarrow{y}}=\frac{\kappa }{\rho C_p}{T}_{yy}+\frac{1}{\sigma \rho C_p}{\left({\left(H_x\right)}_{\overrightarrow{y}}\right)}^2+\frac{v}{C_p}{\left(u_y\right)}^2+\frac{16\sigma T_{\infty }}{3\rho C_p\kappa }{T}_{yy}+\frac{Q_0}{\rho C_p}\left(T-T_{\infty }\right)$$

(13)

with the associated boundary conditions being

$$\begin{array}{l}t\le 0,u=0,v=0,{\mathrm{H}}_x=0,T=T_{\infty },C=C_{\infty } for all y\\ t>0,u=0,v=0,{\mathrm{H}}_x=0,T=T_{\infty },C=C_{\infty } at x=0\\ u={\mathrm{U}}_0,v=0,{\mathrm{H}}_x={\mathrm{H}}_w,T=T_w,C=C_w at y=0\\ u\to 0,v\to 0,{\mathrm{H}}_x\to 0,T\to T_{\infty },C\to C_{\infty } at y\to \infty \end{array}$$

(14)

3. Mathematical Formulation

For solving numerically, the governing Equations (8)–(10), (12) and (13) along with Equation (14) are required to be non-dimensional. In this regard, the following non-dimensional variables are presented [55]:

$$\begin{array}{l}x=U_{0}x/v,y=U_{0}y/v,u=u/U_0,v=v/U_0,t=\frac{U_0^{2}t}{v},\theta =T-T_{\infty }/T-T_w,\\ \varphi =C-C_{\infty }/C_w-C_{\infty },Sc=\frac{v}{D_m},\mathrm{Pr}=\frac{\rho v{C}_p}{\kappa },Gr=\frac{vg\beta (T_w-T_{\infty })}{U_0^3},Q=\frac{Q_{0}v}{U_0^2\rho C_p}\\ M=\sqrt{\frac{{\mu }_e}{\rho }}\frac{H_0}{U_0},H_x=\sqrt{\frac{{\mu }_e}{\rho }}\frac{H_x}{U_0},Ec=\frac{U_0^2}{C_p(T_w-T_{\infty })},G{r}_m=\frac{vg\beta (C_w-C_{\infty })}{U_0^3},\\ S_0=\frac{D_m{\kappa }_T(T_w-T_{\infty })}{v{T}_m(C_w-C_{\infty })},h=\sqrt{\frac{{\mu }_e}{\rho }}\frac{Hw}{U_0},Rd=\frac{4T_{\infty }^3\sigma }{\kappa \kappa },K_{ch}=\frac{K_{0}v}{U_0^2},{\mathrm{Pr}}_m=\sigma v{\mu }_e\end{array}$$

(15)

The dimensionless form of the above equations become

$$u_x+v_y=0$$

(16)

$$u_t+u{u}_x+v{u}_y=Gr\theta +G{r}_m\varphi +u_{yy}\frac{{\partial }^2}{{\partial }^2}+M{(H_x)}_y$$

(17)

$${(H_x)}_t+u{(H_x)}_y+v{(H_x)}_y=H_x{u}_x+M{u}_y+\frac{1}{{\mathrm{Pr}}_m}{(H_x)}_{yy}$$

(18)

$${\theta }_t+u{\theta }_x+v{\theta }_y=\frac{1}{\mathrm{Pr}}\left(1+\frac{4}{3}{R}_d\right){\theta }_{yy}+\frac{Ec}{{\mathrm{Pr}}_m}{\left({\left(H_x\right)}_y\right)}^2+Ec{\left(\frac{\partial u}{\partial y}\right)}^2+Q\theta$$

(19)

$${\varphi }_t+u{\varphi }_x+v{\varphi }_y=\frac{1}{Sc}{\varphi }_{yy}+S_0{\theta }_{yy}-K_{ch}\varphi$$

(20)

and the corresponding non-dimensional from of (14) is

$$\begin{array}{l}t\le 0,u=0,vv=0,{\mathrm{H}}_x=0,\theta =0,\varphi =0 for all \overrightarrow{y}\\ t>0,u=0,v=0,{\mathrm{H}}_x=0,\theta =0,\varphi =0 at x=0\\ u=1,v=0,{\mathrm{H}}_x=hh=1(say),\theta =1,\varphi =1 at y=0\\ u\to 0,v\to 0,{\mathrm{H}}_x\to 0,\theta \to 0,\varphi \to 0 at y\to \infty \end{array}$$

(21)

3.1. Local Shear Stress and Average Shear Stress

The influence of numerous factors on shear stress has been determined using the velocity field. The subsequent equations correspond to the local and average shear stress is ${\tau }_L=\mu {\left({\overrightarrow{u}}_{\overrightarrow{y}}\right)}_{\overrightarrow{y}=0} \mathrm{and} {\tau }_A={\displaystyle \int {\left({\overrightarrow{u}}_{\overrightarrow{y}}\right)}_{\overrightarrow{y}=0}d\overrightarrow{x}}$ alike to ${\left({\overrightarrow{u}}_{\overrightarrow{y}}\right)}_{\overrightarrow{y}=0} \mathrm{and} {\displaystyle \underset{0}{\overset{100}{\int }}{\left({\overrightarrow{u}}_{\overrightarrow{y}}\right)}_{\overrightarrow{y}=0}dx}, \mathrm{respectively}$.

3.2. Local Current Density and Average Current Density

With the application of induced electric field, the effects of numerous factors upon the current density have been perceived. The resultant equations indicate that the local and average current density across the surface are ${\mathrm{J}}_L=\mu {\left[-{\left({\overrightarrow{H}}_x\right)}_{\overrightarrow{y}}\right]}_{\overrightarrow{y}=0} \mathrm{and} {\mathrm{J}}_A=\mu {\displaystyle \int {\left[-{\left({\overrightarrow{H}}_x\right)}_{\overrightarrow{y}}\right]}_{\overrightarrow{y}=0}d\overrightarrow{x}}$ which are the same as ${\left[-{\left({\overrightarrow{H}}_x\right)}_{\overrightarrow{y}}\right]}_{\overrightarrow{y}=0} \mathrm{and} {\displaystyle \underset{0}{\overset{100}{\int }}{\displaystyle \int {\left[-{\left({\overrightarrow{H}}_x\right)}_{\overrightarrow{y}}\right]}_{\overrightarrow{y}=0}d\overrightarrow{x}, \mathrm{respectively}}}$.

3.3. Local and Average Nusselt Number

With the assistance of heat flux, the inspiration of numerous factors on the Nusselt number has been examined. The succeeding equations resemble the local and average Nusselt numbers, i.e., $N{u}_L=\mu {\left[-{\left({\overrightarrow{T}}_x\right)}_{\overrightarrow{y}}\right]}_{\overrightarrow{y}=0}{ \mathrm{and} \mathrm{Nu}}_A=\mu {\displaystyle \int {\left[-{\left({\overrightarrow{T}}_x\right)}_{\overrightarrow{y}}\right]}_{\overrightarrow{y}=0}d\overrightarrow{x}}$ which are the same as $-{\left[{\theta }_y\right]}_{y=0} \mathrm{and} {\displaystyle \underset{0}{\overset{100}{\int }}-{\left[{\theta }_y\right]}_{y=0}}dx, \mathrm{respectively}$.

3.4. Local and Average Sherwood Number

Additionally, for the concentration profile, the effects of several factors on the Sherwood number have been investigated. The succeeding equations signify that the local and average Sherwood numbers are $S{h}_L=\mu {\left[-{\left({\overrightarrow{C}}_x\right)}_{\overrightarrow{y}}\right]}_{\overrightarrow{y}=0}{ \mathrm{and} \mathrm{Sh}}_A=\mu {\displaystyle \int {\left[-{\left({\overrightarrow{C}}_x\right)}_{\overrightarrow{y}}\right]}_{\overrightarrow{y}=0}d\overrightarrow{x}}$ which are the same as ${\left[-{\left({\varphi }_y\right)}_y\right]}_{y=0} \mathrm{and} {\displaystyle \underset{0}{\overset{100}{\int }}{\displaystyle \int {\left[-{\left({\overrightarrow{\varphi }}_x\right)}_y\right]}_{y=0}dx}}$, respectively.

4. Numerical Solution and Confirmation of the Code

The systems of nonlinear Equations (17), (20) and (21) were solved computationally by using the RK4 method. First, the PDEs were converted to ODEs by introducing the similarity transformation. In the next step, the nonlinear ODEs were altered to first-order ODEs by introducing new variables, and lastly, the RK4 code was developed in MATLAB and numerical results were obtained through graphs and tables. The procedure of the RK4 is given in Figure 2. For the RK4 method, firstly a specific value for $\eta$ was estimated. Two different estimations were created and assessed at each phase. The assumption was accepted if the solution was satisfied. For the existing work, the step size was $\Delta \eta$ = 0.01 and accuracy 10⁻⁴. For validation of the numerical code, Mathematica package BVPh2 was also used and excellent correlation was found as illustrated in Figure 3.

5. Stability Analysis

To ensure the correctness of the numerical results, test calculations for several values of A were performed and then contrasted with the relevant published findings of Ramakrishna [55], which is shown in

Table 1. Comparison of present work and published work reported by Ramakrishna [55] using $Gr=Grm=2, Pr=0.1, Q=0.5, Ec=0.1, Prm=0.5, S0=0.7, Sc=2$ for different values of $Sc$.

$\mathit{S}\mathit{c}$	Present Work ${\mathit{f}}^{″}(0)$	Ramakrishna [55] ${\mathit{f}}^{″}(0)$	Absolute Error	$\mathbf{Present} \mathbf{Work}—{\mathit{\theta }}^{\prime }(0)$	Ramakrishna [55] $—{\mathit{\theta }}^{\prime }(0)$	Absolute Error	CPU Time
0.2	−0.056534	−0.056525	$0.132\times {10}^{-5}$	2.30244	2.30228	$0.1\times {10}^{-6}$	0.236152
0.4	−0.069844	−0.069832	$0.45\times {10}^{-7}$	2.14910	2.14951	$0.04\times {10}^{-9}$	0.335419
0.8	−0.087808	−0.087815	$0.34\times {10}^{-11}$	1.88910	1.88932	$2\times {10}^{-13}$	0.587210
1.5	−0.090382	−0.090390	$0.05\times {10}^{-15}$	1.74336	1.74347	$8\times {10}^{-22}$	0.023903
2.0	−0.238020	−0.238031	$0.6\times {10}^{-21}$	1.43678	1.43660	$0.01\times {10}^{-25}$	0.556721

with great agreement.

6. Error Explanation

The results provided by the RK4 technique for the majority of differential equations are generally reliable. However, due its results being based on computational sampling and error estimations, substantial inaccuracies are very unlikely. It is often useful to examine outcomes by linking a solution that was calculated with working precision greater than the default Machine Precision (MP). The problem’s result is computed using the RK4 technique with the default work precision, and the error solution is computed using the same approach with working precision-22. Errors are thus usually relatively minor; hence it is advantageous to analyze them on a logarithmic scale. We calculated the error solutions for numerous physical factors used in the model and plotted them in the accompanying graphs. Tyurenkova [49] and Smirnova examined the oxidant flows using self-similar solutions. Smirnov et al. [50] investigated the heat and mass transportation in chemically reactive gas over a liquid fuel layer. Numerical and error solutions for chemical reaction flow were investigated by Smirnov et al. [51]. Similarly, Smirnov et al. [52] used the LOGOS simulation for the hydrogen fuel rocket engines.

Before making any physical predictions, we first performed an error analysis to ensure that the procedure was legitimate. Figure 4, Figure 5, Figure 6 and Figure 7 are designed with this end in mind. During the solution, the RK4 package’s minimal error 10⁻³⁰ was fixed. We used Mathematica module ND-Solve to minimize the total average squared residual error (ASRE). We initially modified the thermal radiation factor $R_d$ and fixed $Gr=Grm=2, Pr=3, Q=0.5, Ec=0.1, Sc=0.7,$ and $Sc=2$ to observe error for numerous orders of approximation. The greatest ASRE at various interpolation orders is shown in Figure 2 and Figure 4. In Figure 1, it is seen that for $R_d=0.8$, the total ASRE and ASRE decrease as the order of approximation increases. Additionally, for $R_d=0.1$, the error is streakily decreasing as compared to the cases for $R_d=0.8$ as shown in Figure 5. By changing the magnetic parameter $M$ and $R_d$ setting $Gr=Grm=2, Pr=3, Q=0.5, Ec=0.1, Prm=0.5, Sc=0.7,$ similarly distinct plots are given in Figure 3 and Figure 4, respectively. Averaged squared residual errors and total averaged squared residual errors both decrease for $R_d=0.1, 0.8$ and $M=0.1, 0.7$ as the order of approximation increases. It is also observed that for $R_d=M=0.1$, the error is streakily reducing in relation to the cases for $R_d=0.8$ and $M=0.7$ as shown in Figure 6 and Figure 7.

7. Results and Discussion

In the occurrence of first-order chemical reactions and heat generation, a numerical study of thermal fluid movement as a result of an induced magnetic field (IMF) in a Darcian permeable regime on a vertical plate was conducted. By numerical calculations, the default values of physical parameters are $Gr=Grm=2, Pr=3, Q=0.5, Ec=0.1, Rd=0.5, Prm=0.5, Sc=0.7, Sc=2$, unless otherwise specified. For different physical parameter variations, graphical observations were made on velocity, concentration, temperature, and IMF.

For various values of magnetic Prandtl number (MPN), the influence of TR parameters (TRP) $R_d$ on the temperature distribution is depicted in Figure 8. The temperature profile of the viscous liquid appears to grow as the TRP increases. An elevation in electromagnetic waves in the channel is due to higher radiation values. The presence of magnetic field electromagnetic waves will produce more heat in the fluid. Additionally, larger MPN corresponds to higher temperatures as shown in Figure 8. Figure 9 depicts the dependence of temperature on the magnetic field parameter. This analysis was performed for different times, i.e., for $t=10$ and $t=5$. Due to the existence of a radiation influence on the fluid flow, an increment in magnetic field will enhance temperature distribution. The graphical representation acknowledges that as time passes, additional electromagnetic waves are released and the temperature rises.

The impact of magnetic parameters on the concentration profile for different times is revealed in Figure 10. Form the mathematical expression of the problem it is witnessed that the concentration profile is proportional to the magnetic factor. With the presence of a magnetic field in the channel, the developing magnetic effect causes a rapid movement in the electric charge produced by the magnetic parameter, leading to a high concentration in the fluid. It is witnessed that if the magnetic effect is enhanced for a prolonged period, an electric charge is released, which improves the concentration in the fluid. For various values of thermal radiation, the fluctuation in concentration throughout the channel is described in Figure 11 for dissimilar values of MPN. In the presence of a high MPN, an increase in thermal radiation causes an escalation in the concentration, indicating that the fluid is a good observer but a poor emitter.

For two dissimilar values of MPN, i.e., $Prm=0.5$ and $Prm=1.5$, Figure 12 illustrates velocity variation for different values of TRP. The increase in MPN and heat radiation decreases the velocity of a chemical reaction’s survival. It is observed that the flow rate is greater near the surface and consciously decreases with the growing values of $y.$ It is also witnessed that for higher values of MPN the velocity variation is smaller compared to the small value of MPN. The dual performance is detected for the heat source factor on the velocity for different values of thermal radiation as portrayed in Figure 12. The point of interest is that the liquid flow velocity increases as the heat source factor increases, relative to the magnetic field. However, at the start of the channel, velocity is higher for higher quantities of heat radiation, but as the channel progresses, velocity decreases owing to the applied magnetic field.

The consequence of a magnetic factor over the applied magnetic field at a given time is shown in Figure 13. Since they oppose each other, the resultant magnetic field effect declines as the magnetic factor is enhanced. Figure 14 shows the consequence of MPN on the induced magnetic field for the given time. It is observed that the influence of MPN on the IMF is the same as shown in Figure 13.

The influence of the physical parameters skin friction (SF), local density current (LDC), and Nusselt number (NN) on the physical quantity of interest are shown in Figure 15, Figure 16, Figure 17, Figure 18, Figure 19, Figure 20 and Figure 21. Figure 15 and Figure 16 display the impact of $M, Gr$, and $Gm$ on SF. It is observed that the SF declines as $M$ is increased and the opposite behavior is detected for the growing values of $Gm$. Similarly, the impact of $M, Pr$, and $Rd$ on the LDC and NN is presented in Figure 17 and Figure 18, respectively. It is observed that with increasing $M, Pr$, and $Rd$, the LDC and NN enhance with the growing values of these physical parameters. The impact of $Ec$ and $Sc$ on the NN and Sherwood numbers is depicted in Figure 19 and Figure 21, respectively. In both cases, the enhancement effect is observed as the physical parameters $Ec$ and $Sc$ are increased.

8. Conclusions

In the current study an analysis has been carried out for MHD time-dependent fluid flow past a porous vertical plate with heat mass transportation, IMF, MPN, TR, and viscous and magnetic dissipation characteristics. In addition, a heat source is included in the model in order to monitor the flow nature in the current study. Because of the nonlinearity in the governing equations, a numerical solution was obtained by using the RK4 method along with the shooting technique. For stability analysis, the existing work was compared with published work. The error analysis was also computed for the physical factors influencing the fluid flow [51,52,53]. The following are the points of interest.

• The temperature profile of the viscous liquid appears to be enhancing as the thermal radiation factor is increased in the presence of MPN. Additionally, larger MPN corresponds to higher temperatures.
• Due to the existence of a radiation influence in the fluid flow, an upsurge in magnetic field enhances temperature distribution. It is also observed that as time passes, additional electromagnetic waves are released and the temperature rises.
• The occurrence of magnetic field in the channel and the developing magnetic effect cause a rapid movement in the electric charge produced by the magnetic parameter, leading to a high concentration in the fluid.
• The point of interest is that the liquid flow velocity rises as the heat source parameter increases. However, as the channel progresses, velocity decreases owing to the applied magnetic field.
• It is witnessed that if the magnetic effect is enhanced for a prolonged period, an electric charge is released, which improves the concentration in the fluid.
• In the existence of a high MPN, an increment in TR causes an increase in the concentration, indicating that the fluid is a good observer but a poor emitter.
• It is observed that the SF declines with the increasing values of $M$, and the opposite behavior is perceived for the growing values of $Gm$.