# Intelligent Computing of Levenberg-Marquard Technique Backpropagation Neural Networks for Numerical Treatment of Squeezing Nanofluid Flow between Two Circular Plates

Authors: Hakeem Ullah; Mehreen Fiza; Muhammad Asif Zahoor Raja; Imran Khan; Muhammad Shoaib; Seham M. Al-Mekhlafi
Journal: Mathematical Problems in Engineering
 (2022)

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## Abstract

This study presents new techniques based on the artificial intelligence neural network with Levenberg-Marquardt Scheme with backpropagation (ANN-LMS). The boundary value problem BVP is obtained from the governing equations of the flow model. Along with ANN-LMS, the semianalytical method namely the optimal homotopy analysis method (OHAM) is used for validating the results. ANN-LMS optimized the absolute error and increased the accuracy of the solution. The effect of physical parameters is discussed with the help of plots and tables.


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## Body

## 1. Introduction

The squeezing flow has many important applications in engineering, material science, and physics. The squeezing flow has captured the imagination of many scientists and engineers in recent years due to its frequent applications in industrial and engineering such as stirring pistons, squeezed film and polymer manufacturing, sweet fillers, hydraulic lift, electric motors, flow within the nozzle and nasogastric tube, power transmission, modeling of chewing and eating, heart values and blood vessels [1–6]. Stefan [7] initiated pioneering works in this direction. Verma [8] examined the numerical solution of squeezing flow between the two plates. Sheikholeslami et al. [9] used the Adomian decomposition method (ADM) to explore the unsteady squeezing flow of nanofluids. Gupta and Ray [10] investigated the unsteady squeezing flow of nanofluid between two parallel plates numerically. The squeezing flow of a second-grade fluid was investigated by Rajagopal and Gupta [11]. Hayat et al. [12] investigated the squeezing flow of second-grade material by two disks. Hayat et al. [13] presented a three-dimensional squeezing flow between two parallel plates with mixed convection. The squeezing flow of electrically conducting fluids between parallel plates under the influence of a magnetic field has been studied extensively in recent years. Siddiqui et al. [14] adopted the homotopy perturbation method and investigated the magnetic effect of squeezing viscous magnetohydrodynamics (MHD) fluid flow. Ahmed et al. [15] investigated MHD squeezing flow of Casson fluid between parallel disks. For the solutions of the system of ODEs/PDEs, both the analytical and numerical methods are in practice. The numerical methods required linearization and discretization techniques which distress the accuracy. The AI-based numerical technique was frequently used in different applications to solve differential equations [16–18], but there is a need to explore and exploit the stochastic numerical technique based on intelligent computing paradigms to solve and analyze the problems given in Equations (14)–(16). A few recently published studies of paramount importance contain mathematical model solution in nonlinear optics [19], atomic physics [20], and financial models [21, 22], eye model [23], COVID-19 virus spread models [24, 25], entropy generation system [26, 27], and flow problems [28–40]. According to our literature research, to examine the SFNM between two circular plates, we apply the AI technique through the ANN-LMS to realize nonlinear backpropagation of neural network to Equations (14)–(16). This outlines the creative features of the emerging computing model as follows:(1)
A unique two-layer feed-forward backpropagation of ANN-LMS is proposed for the analysis of squeezed flow between two circular plates(2)
The MSE-based merit function is planned for the realization of ANN-LMS for estimated modeling of squeezed flow between two circular plates by means of the PF, TT, FT, and VL reference dataset(3)
The accurate, consistent, and convergent PR of the constructed proposal ANN-LMS is authenticated for the problem while the solver values are further authorized by the error analysis and EH and RG studies.


## 2. Flow Analysis

Let us assume an incompressible squeezing flow between two circular disks with separation2st. The plane for the mentioned flow is suggested as z˜,r˜ plane, and the plate movements are about the central axis z˜=0, and the axisymmetric is about r˜=0. The plate movement is about the z axis which is symmetric and nonrotating as shown in Figure 1.Figure 1
Flow diagram.The velocity field is given asV=ur,z,t,0,wr,z,t. The governing equations are given as follows:(1)1r∂rru+∂zw=0,∂tu+u∂ru+w∂zu=−∂rpρ+ν∇2u−ur2,∂tw+u∂rw+w∂zw=−∂zpρ+ν∇2w.With BCs,(2)u=0,w=vcz=h,∂zu=0,w=0z=0,where vc is the velocity of circular plates and ∇¯2 as dell operator also using the nondimensional variable η=z/h and u=−rvc/2htf′η,w=vcfη. The governing equations becomes(3)f‴′+Rη−ff‴+2f″−Qf″=0,R=hεv,Q=h2vcdεdt,f1=1,f′1=0,f0=0,f″0=0.


## 3. Numerical Results and Explanation

This section provides a concise explanation of the approach used, and the results of the numerical simulations received through the backpropagated supervised network ANN-LMS designed for the fluid flow system represented via 14–15 based on SFNM. The six steps of the proposed methodology’s step-by-step process flow are shown in Figure2. The 201 input grid between the closed intervals of 0 and 1 is used to produce the proposal dataset for ANN-LMS for the problem. Presently, 10% of the data are used for TT, 10% for VL, and 80% of the data are used at random for TR. Neural network-based supervised learning is constructed after constructing the data through Equations (14)–(15). TR data are utilized to formulate the estimated solution based on an MSE-based merit function. This article presents numerical experimentation for the ANN-LMM for SFNM between two plates that are circular. For one scenario, in the g, the design of the ANN-LMM is used as shown in Tables 1 and 2. The “nts” method of Matlab’s neural network toolbox is used to create ANN-LMS, which has a two-layer feed-forward network structure with backpropagation. Figure 3 depicts the structural layout for the designed network, which uses the concept of the hidden layer through activation function and appropriated adjustments of weights.Figure 2
(1–6): Operational flow between two circular plates for the proposed ANN-LMS for SFNM.Table 1
Values of physical quantities affectingf for the fluid flow problem under consideration.
Physical quantities RScenariosCases1113253Table 2
Values of physical quantities effectingf′ for the fluid flow problem under consideration.
Physical quantities RScenariosCases1113253Figure 3
Networks flow diagram.In Figures4–7, for the scenario one case one of f and f′ results of ANN-LMS, error histogram, and FT are shown, respectively. In Figure 8, the RG analysis of SFNM between two plates that are circular is shown. For case one scenario one, there is a convergence of MSE for TR, VL, and TT progression in Figures 4(a) and 4(b). This scenario involves one SFNM between two circular plates. In Tables 3 and 4, for the scenario one case, one different numerical values are presented. We noticed that at epochs 170, the greatest network PF are 1.176e−9, and at epoch 19 1.2e−9, respectively. In Figures 5(a) and 5(b), the back-gradient propagation’s and step size Mu are approximately (at the epochs 25 and at the epochs 170) and (10−10, 10−9), respectively. The ANN-LMS′ PF-generated results are examined along with a numerical recommendation from the OHAM technique against Scenario 1 (first case). Figures 7(a) and 7(b) show the outcomes in terms of solution and errors. Step size is 0.01 for the domain values lies between 0 and 1. Figure 8 reflects the outcomes of Regression for the scenario 1 of the flow problem. Figures 6(a) and 6(b) corresponding to scenario 1 (first case) represent the error analysis through EH. The maximum error that the intended ANN-LMS can accomplish for TT, TR, and VL data is less than 1e4 and 4e4 for case one scenario one of the system model. R values for correlations are always close to one. Tables 3 and 4 show the results of the fluid flow system ANN-LMS approach for resolving Case 1 and scenario one of the SFNM. For scenarios one and case one of SFNM between two circular plates, the PF of ANN-LMS is approximately 10−11, 10−12, and 10−9 to 10−10. These results show that ANN-LMS can solve SFNM between two circular plates with a reliable PF. In light of this, scenario one’s velocity profiles and ANN-LMS results are calculated. Figures 9–10 are constructed for the outcomes fζ and fζ. As a consequence of the ANN-coordination LMMs with standard OHAM solutions in Case 1 and Scenario 1, the absolute error from orientation solutions has been determined, and the results are displayed in Figures 9(b) and 10(b) for scenario one case one. Absolute errors for the fζ and fζ are 10−4 to 10−7, 10 −3 to 10−05, 10−5 to 10−6, and 10−3 to 10−6, 10−4 to 10−6, 10−4 to 10−5, respectively.  The absoulte errors ofscenario 1 for f and f' are 10-3 to 10-6, 10-4 to 10-6, 10-4 to 10-5, and 10-4 to 10-7, 10 -3 to 10-05 , 10-5 to 10-6, respectively. As the plates come together, the pressure between them is greater than the pressure in the center, and vice versa. The pressure differential for various values of R is shown in Figure.Figure 4
Case one of scenario one SFNM between two circular plates, PF result of MSE for proposed ANN-LMS.
(a)(b)Figure 5
The outcome of the intended ANN-state LMS’s transition dynamic for the first scenario (case1).
(a)(b)Figure 6
EH representation against first scenario (case1).
(a)(b)Figure 7
FTs representation against first scenario (case1).
(a)(b)Figure 8
FTs representation against first scenario (case1).
(a)(b)Table 3
Results for scenario 1 of the flow problem forf.
CaseMSEPerformanceGradient (E)Mu (E)EpochTimeTrainingValidationTesting13.85913E − 108.05434E − 104.08718E − 108.61E − 119.81–81–9270021.744E − 96.13895E − 93.05430E − 81.74E − 99.99–81–8245034.408E − 106.56798E − 107.06632E − 104.41E − 109.98–81–92410Table 4
Results for scenario 1 of the flow problemf ’.
CaseMSEPerformanceGradient (E)MuEpochTimeTrainingValidationTesting18.60809E − 111.17599E − 94.08718E − 108.61E − 119.88–81E − 9278028.3733E − 95.74998E − 91.34309E − 85.81E − 121.00–81E − 11220037.891E − 115.34501E − 119.06819E − 114.789E − 111.43–81E − 910003Figure 9
A comparison of OHAM and ANN-LMS is presented along with a suggested numerical result corresponding to the first scenario forg.
(a)(b)Figure 10
OHAM and ANN-LMS solutions comparison with suggested numerical results for scenario 1.
(a)(b)Figure 11
Variation of pressure for different values of R.


## 4. Concluding Remarks

Intelligence-based intellectual computing backpropagation provides an alternative environment for the solution of fluid flow problem under consideration in terms of performance plots, regression metrics, gradient analysis, and error dynamics through histograms consisting of a variety of bins. The followings are the main results of the study:(1)
As the plates become closer to one another, the pressure between them rises more than the pressure in the centre and vice versa(2)
Velocity profile depicts the opposite trends corresponding to positive and negative values of Reynolds number(3)
The selction of dataset such as 80% fortraining, 10% for validation and 10% for testing proves that our method is stable, relaiable, and fast convergent than the other methods(4)
Pressure rises in the direction towards the middle region between two plates when both plates get closer to each other.(5)
By contrasting the results with a numerical method, the method’s validity is established (Runge–Kutta method having order 4)(6)
The initial guess and linearization methods are not necessary for ANN-LMS(7)
Due to its ability to reduce accuracy and absolute error, ANN-LMS performs better than other approachesFuture direction: the authors are motivated to work on new unsupervised learning algorithms after successful completion of work representing supervised learning [34–36].



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