Local Fractional Variational Iteration Algorithms for the Parabolic Fokker-Planck Equation Defined on Cantor Sets
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1 Progr Fract Differ Appl 1, No 1, 1-10 (2015) 1 Progress in Fractional Differentiation and Applications An International Journal Local Fractional Variational Iteration Algorithms for the Parabolic Fokker-Planck Equation Defined on Cantor Sets Dumitru Baleanu 1,2, Hari M Srivastava 3 and Xiao-Jun Yang 4, 1 Department of Mathematics and Computer Sciences, Faculty of Arts and Sciences, Cankaya University, TR Ankara, Turkey 2 Institute of Space Science, R Măgurle-Bucharest, Romania 3 Department of Mathematics and Statistics, University of Victoria, Victoria, British Columbia V8W 3R4, Canada 4 Department of Mathematics and Mechanics, China University of Mining and Technology, Xuzhou, Jiangsu , People s Republic of China Received: 2 Sep 2014, Revised: 18 Oct 2014, Accepted: 20 Nov 2014 Published online: 1 Jan 2015 Abstract: In this article, we apply the local fractional variational iteration algorithms for solving the parabolic Fokker-Planck equation which is defined on Cantor sets It is shown by comparing with the three LFVIAs that the LFVIA-II is the easiest to obtain the nondifferentiable solutions for linear local fractional partial differential equations Several other related recent works dealing with local fractional derivative operators on Cantor sets are also indicated Keywords: Approximate solution, parabolic Fokker-Planck equation, local fractional derivative operators, Cantor sets 2010 Mathematics Subject Classification Primary 26A33, 35A20; Secondary 33B15 1 Introduction, Motivation and Preliminaries Fractional calculus [1, 2, 3, 4, 5, 6, 7, 8, 9] has found successful applications in science and engineering, such as fractional-order signals, physics, bioengineering, and dynamics of particles As an important fractional-order PDEs arising in mathematical physics, the space-and time-fractional Fokker-Planck equation was first derived from the generalised master equation [10] with the time-fractional derivative and after that it ws developed in [11] Based on it, Barkai [12] successfully found the solutions of the continuous time random walk, whistle Odibat and Momani [13] suggested VIM and ADM to solve it Meanwhile, Den presented the FEM to obtain the numerical solution [14] A new version of the time-fractional FP equation was suggested by using dynamical systems of FBM [15] and the fractal time evolution with a critical exponent [16] Another version of the space-fractional FP equation from the fractional Liouville equation via fractional-power systems [17, 18] and the fractional-order governing equation of Lévy motion [19] was reported Based on this, the upwind difference method was considered by Liu [20] to deal with it Meanwhile, the finite difference method was proposed by Chen et al [21] to solve it The various versions of local fractional calculus theory [22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33] were considered to describe the non-differentiable problems from local fractional PDEs in physics and science due to the surface and structure of materials, which are so-called fractals [34] Local fractional VIM [35, 36] was one of usual methods for finding nondifferentiable solutions for the local fractional PDEs The FP equation defined on Cantor sets was presented as follows (see [37,38]): Corresponding author dyangxiaojun@163com (,η)= (,η)+ (,η) (1) η η
2 2 D Baleanu et al : Local Fractional Variational Iteration Algorithms The parabolic equation defined on Cantor sets can be presented as follows: (,η)= χ(,η) η (,η)+κ(,η) (,η), (2) η where χ(,η) and κ(,η) are parameters The goal of this article is to suggest the local fractional variational iteration algorithms (LFVIAs) [39, 40] to the parabolic equation defined above on Cantor set This article is organized as follows In Section 2, we review the local fractional calculus theory In Section 3, the local fractional variational iteration algorithms are analyzed In Section 4, the non-differentiable solution for the parabolic Fokker-Planck equation defined on Cantor sets is obtained Finally, the conclusions are provided in Section 5 2 Local Fractional Calculus Theory In this section, we first introduce the concepts and notations of the theory of the local fractional calculus To begin with, we recall the result for the local fractional continuity Let be a subset of the real line and be a fractal If g :(,ρ) (Ξ,ρ) is a bi-lipschitz mapping, then (for constants µ,η > 0 and R) we have µ s H s ( ) H s( g( ) ) η s H s ( ) (3) such that, for all 1, 2, Following (4), we have which yields µ 1 2 g( 1 ) g( 2 ) η 1 2 (4) where 2 1 <κ, ε,κ > 0, and H is an -dimensional Hausdorff measure Using (6), one leads to the following relation: g( 1 )g( 2 ) η 1 2, (5) g( 1 )g( 2 ) ε, (6) lim 1 g()=g( 1 ), (7) which exhibits the fact that g() is a so-called local fractional continuous function at = 1 We write g() C (σ,υ), (8) if g()is only a local fractional continuous function on the interval(σ, υ) In order to make very fine distinction from the classical continuous function theory, we consider the new form (6) as the local fractional continuous condition We notice that the constant is the special function because it belongs to either Lipschitz or bi-lipschitz The -dimensional Hausdorff measure given by (see [41]) H ( (σ,υ))=(υ σ), (9) shows that (0< < 1) is a fractal dimension value, and it is the graph of Cantor function presented in [42] from σ = 0 to υ = 1 Namely, it is directly deduced from fractal geometry There also are several other useful functions as follows [41]: E ( )= i=0 i Γ (1+i), (10) and sin = i=0 cos = (1) i (2i+1) Γ [1+(2i+1)] i=0 (11) (1) i i Γ (1+i) (12)
3 Progr Fract Differ Appl 1, No 1, 1-10 (2015) / wwwnaturalspublishingcom/journalsasp 3 For 0< < 1 and g() C (σ,υ), we define the local fractional derivative of g() of order as follows (see [22, 23,35,36,37,38,39,40,41]): g () ( 0 )= d g() ( g()g(0 ) ) d = lim =0 0 ( 0 ), (13) where ( g()g( 0 ) ) = Γ (1+) ( g()g(0 ) ) Let 0 < < 1, g() C (σ,υ), s j = s j+1 s j, s = max s 1, s 2, s j, and [ ] s j,s j+1 ( j = 0,,N 1) (with s 0 = σ and s N = υ) be a partition of the interval(σ,υ) Define the local fractional integral of g() of order [22, 23,35,36,37,38,39,40,41] σi () 1 υ υ g(s)= g(s)(ds) Γ (1+) σ In view of (14), we have the following relations: and = j=n1 1 Γ (1+) lim f (s j )( s j ) (14) s 0 j=0 σ I () υ g(s)=0 (σ = υ) (15) σ I () υ g(s)= υ I () σ g(s) (σ < υ) (16) Basic formulas for the local fractional derivatives (LFDs) and the local fractional integrals (LFIs) of the functions are listed in Table 1 Table 1 List of local fractional derivatives and integrals of some functions LFDs d g()=0, d where g() is a given differentiable function d E d ( )=E ( ) ]= [ d d d LFIs 0I () g() does not exist where g() is a given differentiable function 0I () E ( )=E ( )1 0I () = cos d ( )=sin ( ) 0I () sin ( )=1cos ( ) d sin d ( )=cos ( ) 0I () cos ( )=sin ( ) In Table 1, g() is a given differentiable function For more details of the fractional calculus and the local fractional calculus theory, see [22,23,35,36,37,38,39,40,41,42,43,44,45] 3 The Local Fractional Variational Iteration Algorithms Let () () take on the local fractional differential operator and σ x υ In view of a local fractional variational principle (see, for example, [23,43]), the local fractional function reads as follows: ( ) Π()= σ I () υ g,(), () () (17) The stationary condition of Eq (17) is given by g φ d d ( ) g φ () = 0 (18)
4 4 D Baleanu et al : Local Fractional Variational Iteration Algorithms Let L and N be linear and nonlinear local fractional operators respectively A correction local fractional functional can be structured as follows (see [39,40]): n+1 ()= n () ϑ[l n (τ)+n n (τ)], (19) where a general local fractional differential equation is presented as follows: L + N = 0, (20) with a restricted local fractional variation n and a fractal Lagrange multiplier ϑ, which is given by (18) After completing the identification of the fractional Lagrange multiplier of (18), the LFVIAs of three types have the following forms: The LFVIA-I: n+1 ()= n () ϑ[l n (τ)+n n (τ)] (21) The LFVIA-II: The LFVIA-III: n+1 ()= 0 () ϑn n (τ (22) n+1 ()= n () ϑ[n n (τ)n n1 (τ)] (23) Making use of the LFVIAs, the non-differentiable solution of (20) reads as follows: The present method is also utilized to discuss the wave phenomena [44,45] = lim n n (24) 4 Non-Differentiable Solution Let χ(,η)= 2 Γ (1+) and κ(,η)= 3 Γ (1+) Then the parabolic FK equation defined on Cantor sets with local fractional derivative is given as follows: and the initial condition is given by 2 (,η)= Γ (1+) 3 (,η)+ (,η), (25) η Γ (1+) η (0,η)= A correction local fractional functional can be structured as follows: η Γ (1+) (26) n+1 (,η)= n (,η) [ ϑ n(,η)+ 2 Γ (1+) η 3 ] n(,η) Γ (1+) η n(,η) (27) The stationary conditions of Eq (27) are presented as follows: and Hence, clearly, the fractal Lagrange multiplier is simply identified as follows: ϑ () = 0 (28) 1+ϑ τ= = 0 (29) ϑ(τ)=1 (30)
5 Progr Fract Differ Appl 1, No 1, 1-10 (2015) / wwwnaturalspublishingcom/journalsasp 5 From (25) and (30), the three LFVIAs for parabolic FP equation defined on Cantor sets are structured as follows: The LFVIA-I: The LFVIA-II: The LFVIA-III: n+1 (,η)= n (,η) 0 I () n(,η)+ 2 Γ (1+) η 3 n(,η) Γ (1+) η n(,η) (31) n+1 (,η)= 0 (,η) 0 I () 2 Γ (1+) η 3 n(,η) Γ (1+) η n(,η) (32) n+1 (,η)= n (,η) 0 I () 2 Γ (1+) η 3 n(,η) Γ (1+) η n(,η) + 0 I () 2 Γ (1+) η 3 n1(,η) Γ (1+) η n1(,η) (33) 41 LFVIA-I for the FP Equation Defined on Cantor Sets Following (26) and (31), the formulas with non-differentiable terms are presented as follows: 1 (,η) = 0 (,η) 0 I () 0I () 0 (,η)+ 2 3 η 0 (,η) η + 2 η 3 η η η 2, η 0 (,η) (34) 2 (,η) = 1 (,η) 0 I () 0 I () 1 (,η)+ 2 ( η 2 0I () ( 2 η η ( 3 η η 2, 2 η 1 (,η) η 1 (,η) (35) 3 (,η) = 2 (,η) 0 I () 2 (,η)+ 2 ( 2 0I () η ( 0 I () 2 η η 3 2, ( η η 2 η 2 (,η) η 2 (,η) (36)
6 6 D Baleanu et al : Local Fractional Variational Iteration Algorithms 4 (,η) = 3 (,η) 0 I () 0 I () 3 (,η)+ 2 ( 2 0I () η ( 2 η 2 η ( 3 η 2 η 2, n (,η) = n1 (,η) 0 I () 0 I () 2 0I () ( 2 η η ( 3 η η 2 n1 (,η)+ 2 ( η η 3 (,η) η n1 (,η) 3 η 3 (,η) 3 Therefore, the non-differentiable solution of (25) using (32) is reported to be as follows: η n1 (,η) (37) (38) The corresponding graph is illustrated in Figure 1 when = ln2 ln3 η 2 (,η)= lim n (,η)= n Γ (1+) Γ (1+) (39) η Figure 1 The non-differentiable solution of (25) when = ln2 ln3
7 Progr Fract Differ Appl 1, No 1, 1-10 (2015) / wwwnaturalspublishingcom/journalsasp 7 42 LFVIA-II for the FP Equation Defined on Cantor Sets In view of (26) and (32), we have the following formulas with non-differentiable terms: 1 (,η) = 0 (,η) 0 I () 0I () 2, 2 (,η) = 0 (,η) 0 I () 0I () 2, 3 (,η) = 0 (,η) 0 I () 0I () 2, 4 (,η) = 0 (,η) 0 I () 0I () 2, n (,η) = 0 (,η) 0 I () 0I () 2 3 η 0 (,η) 2 η 3 η η η 2 3 η 1 (,η) ( 2 η η 2 ( 3 η η η 2 (,η) ( 2 η η 2 ( 3 η η η 3 (,η) ( 2 η η 2 ( 3 η η η n1 (,η) ( 2 η η 2 ( 3 η η 2 2 η 0 (,η) η 1 (,η) η 2 (,η) η 3 (,η) η n1 (,η) Therefore, the non-differentiable solution of (25) using (33) is reported to be as given below: (40) (41) (42) (43) (44) η 2 (,η)= lim n (,η)= n Γ (1+) Γ (1+), (45) which matches with the result from the LFVIA-I in Subsection 41
8 8 D Baleanu et al : Local Fractional Variational Iteration Algorithms 43 LFVIA-III for the FP Equation Defined on Cantor Sets In connection with (26) and (33), we set up the following formulas in the non-differentiable forms: 1 (,η) = 0 (,η) 0 I () 0 I() 2, 2 (,η) = 1 (,η) 0 I () η 0 (,η) 2 3 η 0 (,η) 2 η 3 η η η 2 3 η 1 (,η) η 1 (,η) 2 3 η 0 (,η) η 0 (,η) 2 ( ( 0 I () 2 η η ) 2 3 η η 2 2 η 3 η η η 2, 3 (,η) = 2 (,η) 0 I () 2 3 η 2 (,η) η 2 (,η) 2 3 η 1 (,η) η 1 (,η) 2 ( ( 0 I () 2 η η 2 3 ) η η 2 ( ( 2 η η 2 3 ) η η 2 2, 4 (,η) = 3 (,η) 0 I () 2 3 η 3 (,η) η 3 (,η) + 0 I () 2 3 η 2 (,η) η 2 (,η) 2 ( ( 2 η η 2 3 ) η η 2 ( ( 0 I () 2 η η 2 3 ) η η 2 2, n (,η) = n1 (,η) 0 I () η n2 (,η) 2 ( 2 η η 2 ( 2 η η 2 0 I () 2 3 η n1 (,η) η n1 (,η) η n2 (,η) ) ) ( 3 η η 2 ( 3 η η 2 (46) (47) (48) (49) (50)
9 Progr Fract Differ Appl 1, No 1, 1-10 (2015) / wwwnaturalspublishingcom/journalsasp 9 Therefore, the non-differentiable solution of (23) using (28) is also reported to be as follows: η 2 (,η)= lim n (,η)= n Γ (1+) Γ (1+), (51) which is in conformity with the results from the LFVIA-I and LFVIA-II in Subsections 41 and 42, respectively 5 Conclusions In the present work, the linear FP equation defined on Cantor sets was solved by using the LFVIAs and its closed solution is obtained By comparing with the LFVIA-I and the LFVIA-III, we conclude that the case of the LFVIA-II is the best way to obtain the non-differentiable solutions of linear local fractional partial differential equations References [1] A A Kilbas, H M Srivastava and J J Trujillo, Theory and Applications of Fractional Differential Equations, North-Holland Mathematical Studies, Vol 204, Elsevier (North-Holland) Science Publishers, Amsterdam, London and New York, 2006 [2] B J West, M Bologna and P Grigolini, Physics of Fractal Operators, Springer, Berlin, Heidelberg and New York, 2003 [3] D Baleanu, K Diethelm, E Scalas and J J Trujillo, Fractional Calculus: Models and Numerical Methods, Series on Complexity, Nonlinearity and Chaos, Vol 3, World Scientific Publishing Company, Singapore, New Jersey, London and Hong Kong, 2012 [4] M D Ortigueira, Fractional Calculus for Scientists and Engineers, Springer, Berlin, Heidelberg and New York, 2011 [5] S Hu, Y-Q Chen and T-S Qiu, Fractional Processes and Fractional-Order Signal Processing: Techniques and Applications, Springer, Berlin, Heidelberg and New York, 2012 [6] R L Magin, Fractional Calculus in Bioengineering, Begerll House, West Redding, Connecticut, 2006 [7] F Mainardi, Fractional Calculus and Waves in Linear Viscoelasticity: An Introduction to Mathematical Models, World Scientific Publishing Company, Singapore, New Jersey, London and Hong Kong, 2010 [8] J Klafter, S-C Lim and R Metzler, Fractional Calculus: Recent Advances, World Scientific Publishing Company, Singapore, New Jersey, London and Hong Kong, 2011 [9] V E Tarasov, Fractional Dynamics: Applications of Fractional Calculus to Dynamics of Particles, Fields and Media, Springer, Berlin, Heidelberg and New York, 2011 [10] R Metzler, E Barkai and J Klafter, Deriving fractional Fokker-Planck equations from a generalised master equation, Europhys Lett 46, (1999) [11] R Metzler and T F Nonnenmacher, Space- and time-fractional diffusion and wave equations, fractional Fokker-Planck equations, and physical motivation, Chem Phys 284, (2002) [12] E Barkai, Fractional Fokker-Planck equation, solution, and application, Phys Rev E 63 (4), Article ID , 1 5 (2001) [13] Z Odibat and S Momani, Numerical solution of Fokker-Planck equation with space- and time-fractional derivatives, Phys Lett A 369 (2007), (2007) [14] W Deng, (2008) Finite element method for the space and time fractional Fokker-Planck equation, SIAM J Numer Anal 47, (2008) [15] G Jumarie, A Fokker-Planck equation of fractional order with respect to time, J Math Phys 33, (1992) [16] S A El-Wakil and M A Zahran, Fractional Fokker-Planck equation, Chaos Soliton Fract 11, (2000) [17] V E Tarasov, Fokker-Planck equation for fractional systems, Int J Mod Phys B 21, (2007) [18] V E Tarasov, Fractional Fokker-Planck equation for fractal media, Chaos 15 (2), Article ID , 1 8 (2005) [19] D A Benson, S W Wheatcraft and M M Meerschaert, The fractional order governing equation of Lévy motion, Water Resour Res 36, (2000) [20] F Liu, V Anh and I Turner, Numerical solution of the space fractional Fokker-Planck equation, J Comput Appl Math 166, (2004) [21] S Chen, F Liu, P Zhuang and V Anh, Finite difference approximations for the fractional Fokker-Planck equation Appl Math Mod 33, (2009) [22] X-J Yang, Local Fractional Functional Analysis and Its Applications, Asian Academic Publisher Limited, Hong Kong, 2011 [23] X-J Yang, Advanced Local Fractional Calculus and Its Applications, World Science Publisher, New York, 2012 [24] K M Kolwankar and A D Gangal, Local fractional Fokker-Planck equation, Phys Rev Lett 80, (1998) [25] A Carpinteri, B Chiaia and P Cornetti, On the mechanics of quasi-brittle materials with a fractal microstructure, Eng Fract Mech 70, (2003) [26] F Ben Adda and J Cresson, About non-differentiable functions, J Math Anal Appl 263, (2001) [27] A Babakhani and V Daftardar-Gejji, On calculus of local fractional derivatives, J Math Anal Appl 270, (2002) [28] Y Chen, Y Yan and K Zhang, On the local fractional derivative, J Math Anal Appl 362, (2010)
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