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Spectral Relaxation Method and Spectral Quasilinearization Method for Solving Unsteady Boundary Layer Flow Problems

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  • S. S. Motsa
  • P. G. Dlamini
  • M. Khumalo

Abstract

Nonlinear partial differential equations (PDEs) modelling unsteady boundary-layer flows are solved by the spectral relaxation method (SRM) and the spectral quasilinearization method (SQLM). The SRM and SQLM are Chebyshev pseudospectral based methods that have been successfully used to solve nonlinear boundary layer flow problems described by systems of ordinary differential equations. In this paper application of these methods is extended, for the first time, to systems of nonlinear PDEs that model unsteady boundary layer flow. The new extension is tested on two problems: boundary layer flow caused by an impulsively stretching plate and a coupled four-equation system that models the problem of unsteady MHD flow and mass transfer in a porous space. Numerous simulation experiments are conducted to determine the accuracy and compare the computational performance of the proposed methods against the popular Keller-box finite difference scheme which is widely accepted as being one of the ideal tools for solving nonlinear PDEs that model boundary layer flow problems. The results indicate that the methods are more efficient in terms of computational accuracy and speed compared with the Keller-box.

Suggested Citation

  • S. S. Motsa & P. G. Dlamini & M. Khumalo, 2014. "Spectral Relaxation Method and Spectral Quasilinearization Method for Solving Unsteady Boundary Layer Flow Problems," Advances in Mathematical Physics, Hindawi, vol. 2014, pages 1-12, June.
    • Handle: RePEc:hin:jnlamp:341964
    DOI: 10.1155/2014/341964
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    Cited by:

    1. Tunde Abdulkadir Yusuf & Adeshina Taofeeq Adeosun & Victor Olajide Akinsola & Ramoshweu Solomon Lebelo & Oluwadamilare Joseph Akinremi, 2023. "Numerical Investigation for Nonlinear Thermal Radiation in MHD Cu–Water Nanofluid Flow in a Channel with Convective Boundary Conditions," Mathematics, MDPI, vol. 11(15), pages 1-16, August.
    2. Stanford Shateyi & Hillary Muzara, 2020. "On Numerical Analysis of Carreau–Yasuda Nanofluid Flow over a Non-Linearly Stretching Sheet under Viscous Dissipation and Chemical Reaction Effects," Mathematics, MDPI, vol. 8(7), pages 1-24, July.
    3. Lekoko, Modisawatsona Lucas & Oloniiju, Shina Daniel & Magalakwe, Gabriel, 2022. "Analysis of buoyancy driven flow inside a vertical filter chamber," Chaos, Solitons & Fractals, Elsevier, vol. 161(C).
    4. Hillary Muzara & Stanford Shateyi, 2023. "Magnetohydrodynamics Williamson Nanofluid Flow over an Exponentially Stretching Surface with a Chemical Reaction and Thermal Radiation," Mathematics, MDPI, vol. 11(12), pages 1-18, June.

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