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New approximate analytical technique for the solution of time fractional fluid flow models
Advances in Difference Equations volume 2021, Article number: 81 (2021)
Abstract
In this note, we broaden the utilization of an efficient computational scheme called the approximate analytical method to obtain the solutions of fractional-order Navier–Stokes model. The approximate analytical solution is obtained within Liouville–Caputo operator. The analytical strategy generates the series form solution, with less computational work and fast convergence rate to the exact solutions. The obtained results have shown a simple and useful procedure to analyze complex problems in related areas of science and technology.
1 Introduction
Recently, the old idea of fractional-order derivatives became the focal point for many researchers. The mathematicians investigated the recent applications of fractional derivatives in advanced fields of applied science and engineering. Since the fractional-order differential operator is nonlocal, the next state of a system depends on its current and previous states. The noninteger order derivatives have the major merit of describing the memory and heredity properties of various phenomena. Therefore the fractional-order derivatives and integrals have numerous applications in science and technology; for example, modeling nonlinear oscillations of earthquakes [1], the fractional-order fluid dynamic traffic model [2], chaos theory [3], signal processing phenomena [4], electrodynamics [5], fractional model of cancer chemotherapy [6], optics [7], fractional diabetes model [8], and other areas [9–14].
A famous viscous fluid flow equation of motion called the Navier–Stokes equation has been developed in 1822 [15]. This Navier–Stokes equation can be regarded as Newton’s second law of motion for fluid substances, and it is a combination of the continuity, momentum, and energy equations. It describes many physical phenomena such as ocean currents, liquid flow in a pipe, blood flows in arteries, and airflow around aircraft wings. The Navier–Stokes model was first modeled as a fractional-order model by El-Shahed and Salem [16] in 2005 from the generalized classical NS equations.
Numerical and approximate analytical solutions of classical NSE and fractional NSE are the primary consideration of researchers. Different techniques have were used by researchers such as Kumar et al. [17], who solved a nonlinear fractional model of NS analytically by coupling LTA and HPM, Kumar et al. [18] also obtained an approximate solution of NSE by coupling ADM and LTA, Ganji et al. [19] and Ragab et al. [20] used HAM for solving fractional-order NS model. Rasool Shah et al. [21] applied a new hybrid method known as the Laplace–Adomian decomposition method (LADM) for analytical approximation of fractional-order system of NS equation. Momani and Odibat [22] used ADM for analytical solution of fractional-order NSE, and Birajdar [23] also applied ADM for approximate solution of fractional-order NSE. Chaurasia and Kumar [24] used the Laplace and Hankel transforms for analytical solution of fractional-order Navier–Stokes model, Parkash et al. [25] used q-HATM for analytical solution of the coupled fractional-order NS model, Barjes et al. [26] used FRDTM for numerical simulation of NSE. Some other recent numerical and analytical methods used for fractional-order models are [27–35].
In this paper, we develop the approximate analytical method (AAM) based on an analytical strategy using the Riemann–Liouville integral operator and Caputo operator (4). The analytical approximation is obtained by testing some linear and nonlinear Navier–Stokes models of fractional order. The AAM provided tentative results as compared to other numerical and approximate methods.
The rest of this paper is organized as follows. In Sect. 2, we present preliminary concepts. In Sect. 3, we present the procedure of AAM. In Sect. 4, we implement AAM on some fluid flow model. In Sect. 5, we conclude the results.
2 Preliminaries and basic concepts
In this section, we present the related definitions and preliminary concepts of fractional calculus and the procedure of the new AAM.
2.1 Riemann–Liouville integral operator [36]
The Riemann–Liouville fractional partial integral, denoted by \(I_{t}^{\vartheta }\), where \(\vartheta \in N\), \(\vartheta \geq 0 \), is defined as
where, Γ is the gamma function.
2.2 Some properties of Riemann– fractional partial integral
Let \(\vartheta ,\beta \in R\setminus N\), \(\vartheta ,\beta >0\), \(\rho >-1\). Then the operator \(I_{t}^{\vartheta }\) has the following properties for functions \(\upsilon (\Im ,t)\):
2.3 Caputo operator of fractional partial derivative [37]
Theorem 2.1
([36])
Let \(\vartheta ,t \in R\), \(t>0\), and \(m-1<\rho <m\in N\). Then
3 NAAM procedure for the solution of problems [36]
In this section, we discuss a general procedure of NAAM for the solution of fluid model. Consider the nonlinear time fractional-order physical model of the form
with initial source
where \(\mathcal{L}\) is a linear operator, whereas ℵ is a nonlinear operator.
For computational procedure, we define some basic definitions and results.
Lemma 3.1
([26])
For \(\upsilon (\Im ,\Re ,\xi ,t)=\sum_{0}^{\infty }\rho ^{k} \upsilon _{k}( \Im ,\Re ,\xi ,t)\), the linear operator \(\mathcal{L}\upsilon (\Im ,\Re ,\xi ,t)\) has the following property:
Theorem 3.2
([26])
Let \(\upsilon (\Im ,\Re ,\xi ,t)=\sum_{0}^{\infty }\upsilon _{k}(\Im , \Re ,\xi ,t)\). For the parameter λ, we define \(\upsilon _{\lambda }(\Im ,\Re ,\xi ,t)=\sum_{0}^{\infty }\lambda ^{k} \upsilon _{k}(\Im ,\Re ,\xi ,t)\). Then the nonlinear operator \(\aleph \upsilon (\Im ,\Re ,\xi ,t)\) satisfies the following property:
Definition 3.3
([1])
The polynomial \(P_{n}=P_{n}(u_{0},u_{1},\ldots ,u_{n})\) is defined as
Definition 3.4
([26])
If \(P_{n}=P_{n}(u_{0},u_{1},\ldots ,u_{n})\), then by definition (8) the nonlinear operator \(\aleph ( \upsilon _{\lambda } )\) is expressed as
3.1 The existence and uniqueness of NAAM solution [26]
The existence of NAAM is discussed by the following theorem.
Theorem 3.5
Let \(g(\Im ,\Re ,\xi ,t)\), \(\upsilon (\Im ,\Re ,\xi ,t)\) be defined for \(m-1<\vartheta <m \) in (5). Then the fluid model (5) provides the unique solution in the form
where, \(\mathcal{L}_{t}^{-\vartheta }(\upsilon _{(k-1)})\) and \(P_{(k-1)t}^{-\vartheta }\) represent the fractional partial integrals of order ϑ for \(\mathcal{L}(\upsilon _{k-1})\) and \(P_{(k-1)}\) with respect to t.
Proof
Consider the solution of physical model \(\upsilon (\Im ,\Re ,\xi ,t)\) obtained by using the following expansion:
To solve the physical model with initial source (5), we consider
along with initial source
Furthermore, we approximate the solution of equation (10) as
Using the Riemann–Liouville fractional partial integral operator of order ϑ with respect to t on both sides of equation (12) and thus using the properties of the Riemann–Liouuille fractional order operator (4), we obtain
By using the initial source (13) equation (15) becomes
Substituting equation (14) into equation (16), we have
Using Lemma 3.1 and Definition 3.4, equation (17) becomes
Equating the coefficients at the same powers of λ in equation (18), we obtain the component form
□
4 NAAM implementation and discussion of results [26]
In this section, we use NAAM for analytical analysis of some mathematical models related to fluid mechanics.
Example 4.1
Consider the time fractional-order Naiver–Stokes model along with initial source in the form [22];
with initial source
where \(\xi =-\frac{1}{\rho }\frac{\partial p}{\partial z}=1\). In the particular case \(\vartheta =1\) the exact solution is
To solve the physical model (20), comparing it with equation (5), we get
where the nonlinear term \(\aleph (\upsilon (\Im ,t))=\frac{1}{\Im } ( \frac{\partial \upsilon (\Im ,t)}{\partial \Im } )\).
The approximate solution of equation (20) is assumed as
For obtaining the analytical solution of equation (21), we use the procedure
with initial source
We assume that equation (23) has the solution of the form
Now by using Riemann–Liouville fractional-order integration with respect to t on both sides of equation (23), its properties (2), and initial source (24), we obtain
Use equation (25), we obtain
Equating the terms with identical powers of λ of equation (27), we get the final components and recursive relation of the form
Thus we obtain
The NAAM solution is
By putting the corresponding obtained values we get
Specifically, for \(\vartheta =\xi =1 \), the solution becomes the given exact solution
Example 4.2
The time fractional Navier–Stokes model is given as [22]
with initial source
where \(\xi =-\frac{1}{\rho }\frac{\partial p}{\partial z}=1\). In the particular case \(\vartheta =1\), the exact solution is
Comparing equations (36) and (5), we have
where the nonlinear term \(\aleph (\upsilon (\Im ,t))=\frac{1}{\Im } (\frac{\partial \upsilon (\Im ,t)}{\partial \Im } )\).
The approximate solution of equation (36) is assumed as
We obtain the solution of equation (36) by using the following procedure:
with initial source
We assume that equation (38) has the solution of the form
Using Riemann–Liouville fractional-order integration with respect to t of both sides of equation (39), its properties (2), and initial source (40), we obtain
Using definition (9) and equation (41), we obtain
Equating the terms with identical powers of λ of equation (27), we get the following recursive scheme:
Thus we obtain
The NAAM solution is
Using the NAAM components, we have
Specifically, for \(\vartheta =\rho =1 \), the solution becomes the given exact solution
Example 4.3
Consider the time fractional-order incompressible models of Navier–Stokes with initial source in the form [25, 26]
with initial sources
We assume that equation (52) has the solution of the form
Using Riemann–Liouville fractional order integration with respect to t on both sides of equation (52), its properties (2), and initial sources, we obtain
By (9) and equation (54) we obtain
Equating the terms with identical powers of λ of equation (55), we get the final components of the system in the form of recursive relations
Thus we obtain the terms of NAAM of equation (56) as
Thus we also obtain the terms of NAAM of equation (57) as
Thus the NAAM solution becomes
Putting the corresponding values of u and υ into (58), (59), we get
For the particular case of integer order \(\vartheta =1\), we convert the NAAM result to the exact form solution
Example 4.4
Consider the time fractional-order incompressible models of Navier–Stokes with initial source in the form [25, 26]
with initial sources
We assume that equation (63) has the solution of the form
Now by using the Riemann–Liouville operator with respect to t on both sides of equation (63), its properties (2), and initial sources, we obtain
Use definition (9) and equation (65), we obtain
Equating the terms with identical powers of λ of equation (66), we get the final components and recursive relation in the form
Thus we obtain the NAAM term of equation (67) in the form
Thus we can also obtain the NAAM term of equation (68) in the form
Thus the NAAM solution becomes
By putting the NAAM components given into equations (69) and (70) we get
For the particular case of integer order \(\vartheta =1\), the NAAM provides the exact form solution
Example 4.5
Consider the three-dimensional time fractional-order incompressible models of Navier–Stokes with initial source in the form [25, 26]
with initial sources
where \(g_{1}=-\frac{1}{\rho }\frac{\partial p}{\partial \Im }\), \(g_{2}=- \frac{1}{\rho }\frac{\partial p}{\partial \Re }\), \(g_{3}=- \frac{1}{\rho }\frac{\partial p}{\partial \xi }\).
We assume that equation (74) has the solution in the form
Using the Caputo operator with respect to t on both sides of equation (74), its properties (2), and initial sources, we obtain
Using definition (9) and equation (76), we obtain
where, p, q, δ, \(p^{\ast }\), \(q^{\ast }\), \(\delta ^{\ast }\), \(p^{\bullet }\), \(q^{\bullet }\), \(\delta ^{\bullet }\) represent the nonlinear terms of system (76).
Equating the terms with identical powers of λ of equation (77), we get the final components and recursive relation in the form
Similarly, we also obtain the recursive scheme
Thus we obtain the NAAM terms of equation (78) in the form
Similarly, we also obtain the NAAM terms of equation (79) in the form
We also obtain the NAAM terms of equation (80) in the form
Thus the NAAM solution becomes
By putting the NAAM components we get
For the particular \(\vartheta =1\), the solution converges to the exact form solution
5 Conclusion
In this paper, we applied a newly developed approximate analytical method based on the iterative procedure and the properties of Caputo and Riemann–Liouville integral operators. First, we proceeded to the iterative approximation and then used the Liouville integral operator of fractional order with Caputo derivative. The Liouville–Caputo operator provides the approximated term of fractional order. We have solved some linear and nonlinear well-known fluid flow models known as Naiver–Stocks equations. The approximation through the proposed method provides the closed-form solutions of the suggested models. The nonlinearity in each problem is evaluated effortlessly and effectively. The technique is simple to assess both linear and nonlinear terms of the testing problems. The NAA method has a less and more powerful computational ability to evaluate the closed-form analytical solution. Overall, the method has less computational procedures and simple to apply for both linear and nonlinear physical models. This method is also applicable to other physical phenomena of fractional order.
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Researchers Supporting Project number (RSP-2020/210), King Saud University, Riyadh, Saudi Arabia
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The main idea of this paper was proposed by UF, HK, FT, EH, DB and HBJ. KM prepared the manuscript initially and performed all the steps of the proofs in this research. All authors read and approved the final manuscript.
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Farooq, U., Khan, H., Tchier, F. et al. New approximate analytical technique for the solution of time fractional fluid flow models. Adv Differ Equ 2021, 81 (2021). https://doi.org/10.1186/s13662-021-03240-z
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DOI: https://doi.org/10.1186/s13662-021-03240-z