MHD Boundary Layer Flow over a Stretching Sheet: A New Stochastic Method

Ullah, Hakeem; Khan, Imran; Fiza, Mehreen; Hamadneh, Nawaf N.; Fayz-Al-Asad, M.; Islam, Saeed; Khan, Ilyas; Raja, Muhammad Asif Zahoor; Shoaib, Muhammad

doi:https://doi.org/10.1155/2021/9924593

Mathematical Problems in Engineering

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Abstract Introduction Analysis of Results Conclusions Data Availability Conflicts of Interest References Copyright Related Articles

Review Article | Open Access

Volume 2021 | Article ID 9924593 | https://doi.org/10.1155/2021/9924593

MHD Boundary Layer Flow over a Stretching Sheet: A New Stochastic Method

Hakeem Ullah,¹Imran Khan,¹Mehreen Fiza,¹Nawaf N. Hamadneh,²M. Fayz-Al-Asad,³Saeed Islam,¹Ilyas Khan,⁴Muhammad Asif Zahoor Raja,⁵and Muhammad Shoaib⁶

Academic Editor: Giuseppina Colicchio

Received17 Mar 2021

Revised03 Jun 2021

Accepted25 Aug 2021

Published16 Sept 2021

Abstract

In this study, a new computing model is developed using the strength of feed-forward neural networks with the Levenberg–Marquardt scheme-based backpropagation technique (NN-BLMS). It is used to find a solution for the nonlinear system obtained from the governing equations of the magnetohydrodyanmic (MHD) boundary layer flow over a stretching sheet. Moreover, the partial differential equations (PDEs) for the MHD boundary layer flow over a stretching sheet are converting into ordinary differential equations (ODEs) with the help of similarity transformation. A dataset for the proposed NN-BLMM-based model is generated at different scenarios by a variation of various embedding parameters: Deborah number and magnetic parameter (M). The training (TR), testing (TS), and validation (VD) of the NN-BLMS model are evaluated in the generated scenarios to compare the obtained results with the reference results. For the fluidic system convergence analysis, a number of metrics, such as the mean square error (MSE), error histogram (EH), and regression (RG) plots, are utilized for measuring the effectiveness and performance of the NN-BLMS infrastructure model. The experiments showed that comparisons between the results of proposed model and the reference results match in terms of convergence up to E-02 to E-10. This proves the validity of the NN-BLMS model. Furthermore, the results demonstrated that there is a decrease in the thickness of the boundary layer by increasing the Deborah number and magnetic parameter. The importance of the experiment can be seen due to its industrial applications such as MHD power generation, MHD generators, and MHD pumps.

1. Introduction

The boundary layer flow of an incompressible liquid over a stretching sheet is common in many engineering and industrial processes. The field has attracted researchers in the last few decades. The boundary layer flow has major applications in industries such as in the aerodynamic extrusion of a polymer sheet from a die, hot rolling, the cooling of an infinite metallic plate in a cooling bath, the boundary layer along a liquid film in condensation process, and glass-fiber production [1–3]. Many metallurgical processes contain the cooling of continuous filaments by drawing them through a quiescent fluid. The mechanical properties of the product depend on the rate of cooling and the stretching. Sakiadis [4, 5] pioneered the study on the stretching sheet and boundary layer flow. The boundary layer flow over a continuous stretching sheet with constant speed was studied with various conditions. Cran [6] studied the closed form solution of the boundary layer flow with the stretching sheet. Gupta and Gupta [7] investigated the magnetic field effects on the boundary layer flow with the stretching sheet. Anderson [8] studied the porosity effects on the stretching sheet with the conducting particles of fluid. Ariel [9] investigated the combined effect of viscoelasticity and magnetic field on the Cranes problem. Since stretching sheet can occur in a variety of ways, the flow through the stretched sheet does not always need to be of two sizes. If the extension is radial, it can be three. A flat surface of three stretches and the same width was examined by Wang [10]. Brady and Acrivos [11] monitor the flow inside the channel or tube and the Wang flow outside the performing tube [12]. Wang [13] and Usha and Sidharan [14] tested the unstable stretching sheet. Ariel et al. [15] used HPM and expanded HPM to obtain a solution for analysis in the axisymmetric flow across the flat layer of the boundary layer flow. A noniterative solution for MHD flow of the boundary layer flow over a stretching sheet was provided by Ariel [16]. Magnetohydrodynamics (MHD) is the study of the interaction of electromagnetic conditions with the transfer of liquid heat. The flow of conducting fluids is important in many areas of science and engineering, such as MHD power generation, MHD generators, and MHD pumps. Recently, many researchers worked on boundary layer flow [17–25]. They considered the MHD effects of different boundary layer flow with the stretching sheet. Recently, many scientists studied the effects of MHD and heat transfer on various boundary layer flows for different parameters [26–31]. All these numerical methods are applied to solve the problem in different scenarios, and each has advantages and disadvantages. Although stochastic numerical computing based on artificial intelligence has been developed to solve stiff nonlinear problems, these solvers are not yet used to analyze this boundary layer flow model’s governing system. Stochastic numerical computing solvers are generated basically by taking advantage of computing based on artificial neural networks (ANN) modeling and its optimization of the process to solve different problem systems of ordinary or partial differential equations. There are many modern applications of stochastic numerical computing solvers in various branch of sciences such as thermodynamics, astrophysics, offline circuits, atomic physics, MHD, plasma physics, fluid dynamics, electromagnetics, nanotechnology, bioinformatics, electricity, energy and finance, and random matrix theory [31–48]. Inspired from these facts, the authors study to explore and incorporate the soft computing architectures as an alternative, precise, and feasible computational approaches for solving the fluid mechanics systems associated with the boundary layer flow. The main purpose of this study is to analyze the effect of physical parameters associated with the boundary layer flow system under the influence of the magnetic effect by using an intelligent computing technique based on the Levenberg–Marquard algorithm, whereas, Levenberg–Marquard (LM) inherits accuracy and fastness from the Newton method. Moreover, it also has the steepest descent method convergence capability [42]. Optimization of the data used in the training of deep networks is a very important parameter for the prediction performance of the model [49]. Some of the recent development in AI methods can be seen [50–55]. Some structures of our discussion are noted as follows.

The key aspects of the proposed computing paradigm are given as follows: A new application based on artificial intelligence-based computing using neural network backpropagated with Levenberg–Marquard is implemented to study the MHD boundary layer flow with the stretching sheet The dataset for the NN-BLMS is generated for variations of Deborah and magnetic parameters through the OHAM The governing equations are transformed from a set of PDEs into ODE by using similarity transformation The processing of NN-BLMS means training, testing, and validation in employed on the boundary layer flow model for different scenarios to obtain the approximate solution and comparison with reference results The convergence analysis based on mean square, error histogram, and regression plots are employed to ensure the performance of NN-BLMS for the detailed analysis of the boundary layer flow model

The mathematical modeling of the boundary layer flow model has been presented in Section 2. The method for the analysis of the MHD boundary layer flow over a stretching sheet has been discussed in Section 3. The numerical and graphical results with discussion and comparison for the MHD boundary layer flow over a stretching sheet through the proposed technique NN-BLMS with numerical reference results are given in Section 4. Finally, concluding remarks for the study on the proposed methodology for the MHD boundary layer flow over a stretching sheet is presented in Section 5.

2. Mathematical Formulation of the Boundary Layer Flow Model

Consider a viscous fluid on a stretching sheet. Initially, both the sheet and the fluid are at rest. The plate is stretched in the x direction, and fluid starts flowing uniformly. A uniform magnetic field B (x) is applied perpendicular to the flow. The flow is considered steady and incompressible. A boundary layer is originated as shown in Figure 1.

The fundamental equations in the form of continuity and momentum equations are given as [17]

Using the boundary conditions (BCs),

In order to reduce the governing equation into boundary value problem using the following similarity transformation [17],

We obtainwhere and .

3. Solution Procedure

The single neural network model for the proposed NN-BLMS is shown in Figure 2. The general procedure of NN-BLMS presented step by step is given in Figure 3. NN-BLMS is accomplished with the help of nftool in MATLAB by setting for fitting the neural network tools with backpropagation of Levenberg–Marquardt executing the weight of neural networks. It is clear from the analysis that the NN-BLMS is implemented for the fluidic model MHD boundary layer flow over a stretching sheet by setting the values of one parameter and treating the other physical parameters as fixed. In the same fashion, the other parameters are changeable, and a total of three scenarios and each scenario have three cases. The proposed NN-BLMS is performed for four scenarios by varying beta and magnetic parameters for with different cases for each scenario as shown in Table 1. For using the NN-BLMS, we used the step size of 0.03 between the intervals of the problem by using the OHAM. We select 80%, 10%, and 10% for testing, training, and validation, respectively, for 301 data input points for the f values randomly. TR is used for the assembly of a result assembled on MSE, and VD data is used for representing NN, while TT data is used to test the PF of random contributions.

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The NN-BLMS-based computing paradigm with 1-layer structure of neural networks (hidden and output) is shown in Figure 4.

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4. Analysis of Results

The proposed NN-BLMS is used for cases 1 and 3 of all scenarios. Figures 4 and 5 show the results of state and performance, whereas fitting the solution is given in Figures 6–13 . EH plots are given in Figure 14, and the regression analysis is given in Figures 15–22 of the MHD boundary layer flow over a stretching sheet. For cases 1 and 3 of all scenarios, MSE assembly of TR, VLD, and TS processes are given in Figures 4(a)–4(h). One can see that the best PF has been achieved at 6, 153, 3, 12, 479, 391, 440, and 611 epochs with MSE around 3.4885 × 10^–5, 1.3071 × 10^–9 4.295 × 10^–6, 7.7450 × 10^–6, 1.5272 × 10^–7, 5.3331 × 10^–7, 3.5795 × 10^–8, and 3.0441 × 10^–7, respectively, given in Figure 4. Appropriate values for GD and step Mu size of backpropagation are 4.2526 × 10^–04, 9.9537 × 10^–08, 1.678 × 10^–04, 2.3718 × 10^–5, 9.9666 × 10^–8, 9.9689 × 10^–8, 9.9879 × 10^–8, and 9.983 × 10^–08 and 10^–09, 10^–11, 10^–08, 10^–07, 10^–08, 10^–09, 10^–09, and 10^–08 as shown in Figure 5. From these figures and results, it is clearly demonstrated that the NN-BLMS is accurately and reliably convergent in each case of MHD boundary layer flow over a stretching sheet. For cases 1 and 3 of all scenarios of MHD boundary layer flow over a stretching sheet model, the effectiveness of NN-BLMS is scrutinized with the reference numerical results of OHAM along with the error dynamics given in Figures 6–13. The maximum error achieved in the testing, performance, and validation by the proposed NN-BLMS is less than 3.5 × 10^–04, 0.8 × 10^–03, 0.2 × 10^–03, 0.4 × 10^–03, 3.5 × 10^–04, 0.8 × 10^–03, 0.3 × 10^–03, and 1.4 × 10^–03 as given in Figures 6–13. Error variability is also assessed with EH, and the results are given in Figures 14(a)–14(f). Error variability is also assessed with error histogram for each input point, and the results are given in Figure 14. The maximum error achieved is less than 5.5E − 4,−9.8E − 5, −3.7E − 5, −4.3E − 3, −4E − 6, 5.02E − 6, 2.94E – 6, and −4.1E − 5 in all cases of the MHD boundary layer flow over a stretching sheet. The investigation over regression is given with the help of correlation studies. The results of RG are given in Figures 15–22. The study of correlation is piloted by regression studies. The results of regression for each scenario are around unity, and the values of correlation R are reliable, which mean that testing, training, and validations are accurately modeled to perform the NN-BLMS. Moreover, for all three cases of each scenario of the MHD boundary layer flow over a stretching sheet, the convergence attains parameter in terms of PF, MSE, performed period, time of performance, and backpropagation measures which are prescribed in Table 2 for all cases of each scenario separately. The PF is approximately 10–09, 10–10 to 10–09, 10–09, 10–08, 10–08, and 10–08 for all scenarios with 1 and 3 cases of MHD boundary layer flow over a stretching sheet. These results show the stable PF of NN-BLMS for each case of MHD boundary layer flow over a stretching sheet model. The effects of the physical parameters on the velocity profile based on the results of NN-BLMS are given in Figures 23(a)–26(a) . The variation (rise) of the physical parameter Deborah number results to decrease the velocity profile. Initially, the effect of is very small in interval [0, 0.5], and the effect of increasing is very clear in 0.5 to 3 causing decrease in the velocity profile as shown in Figure 23(a). Similarly, the effect of magnetic parameters on velocity profile is shown in Figures 24(a). It is observed that, by increasing the values of, a decrease in velocity profile (boundary layer thickness) is observed. These parameters have low effect near the origin and have a clear impact away from origin. By increasing the physical parameters, a decrease in the velocity profiles is observed. It is due to the fact that the parameters increase the opposing forces which turn to reduce the velocity profile. The effects of these parameters for the velocity profile are given in Figures 25(a) and 26(b). Again, increasing the opposite effects has been observed as shown in Figures 23(a) and 24(a). The NN-BLMS results are verified by comparing the results with numerical, and hence, the validation of our method is proved. In the Figures 20(b), 21(b), and 22(b), the absolute errors (AE) are shown for all scenarios. In these figures, the AE is observed 10–04 to 10–08, 10–03 to 10–06, 10–03 to 10–06, 10–03 to 10–05, and 10–05 to 10–06, respectively. These illustrations clearly indicate the performance of NN-BLMS for the solution of the fluid model. The AE further validates the accuracy and precision of the method. In future, we may apply this method to recent developments in nanotechnology, energy, and biological model like COVID-19 etc.

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In order to validate the efficiency and accuracy of the new proposed method, we compare its results with the methods available in the literature like OHAM and MOHAM as given in Table 3 and Figure 27. All of these numerical and graphical diagrams ensure the precise, flexible, and robust functionality of the NN-BLMS for the MHD boundary layer flow over a stretching sheet.

5. Conclusions

The computational strength in terms of the supervised learning method NN-BLMS is exploited to obtain a numerical solution for the MHD boundary layer flow over a stretching sheet after the transformation of PDEs based on the flow model into a system of ODEs by using similarity variable conversions. The optimal homotopy asymptotic method is used for the present dataset for the flow model. The data containing training, testing, and validation for NN-BLMS depending on various scenarios are determined by 80%, 10%, and 10%, respectively. The close agreement of both proposed and a reference result is . This means that the proposed model provides highly accurate results for the fluidic system under consideration. The efficacy and performance of the proposed NN-BLMT for the solution of the flow model appears via mean squared error functions, performance measures, regression metrics, and histograms. Some of the key points are given as follows: NN-BLMS contains less computational work and do not required linearization and is fastly convergent. NN-BLMS is simple in applicability. NN-BLMS has better PF as compared to other numerical methods. NN-BLMS minimizes the absolute error. The correctness of NN-BLMS is authenticated by MSC, EH, RG, AE, FT, PF, TS, and TR. NN-BLMS uses 80%, 10% and 10% of the reference data are used as a TR, TS, and VL. Also, the physical variation of the parameters indicates that the boundary layer thickness decreases by increasing the Deborah, porosity, and magnetic parameters. The boundary layer flows have many applications in engineering and industries such as in the aerodynamic extrusion of a polymer sheet from a die, hot rolling, the cooling of an infinite metallic plate in a cooling bath, the boundary layer along a liquid film in condensation process, and glass-fiber production. The conducting boundary layer flows have industrial and engineering applications such as MHD power generation, MHD generators, and MHD pumps productions. This procedure will be used for the nanofluid flow problems and nanotechnology. In future, the new types of platforms based on artificial intelligence will be developed for the flow problems.

Nomenclature and SI units

a, b, c:	Constants.
:	Magnetic field
:	Electric field intensity
:	Homotopic functions.
:	Distance between the plates
:	Magnetic parameter
:	Boundary layer parameter
:	Origen.
:	Fluid pressure
:	Fluid temperature
, :	Velocities components
:	Stretching velocity
:	Coordinates
,:	Topological space
:	Thermal diffusivity
:	Similarity variable.
:	Dynamic viscosity
:	Kinematic coefficient of viscosity.

Data Availability

All the relevant data are available in the manuscript.

Conflicts of Interest

The authors declare that they have no conflicts of interest.

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Copyright © 2021 Hakeem Ullah et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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