A DUAL-TIME IMPLICIT POWER-LAW PRECONDITIONING METHOD FOR SOLVING UNSTEADY INCOMPRESSIBLE FLOWS

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DERAZGISOO SEYED MOEIN; AKBARZADEH POORIA

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Journal: Modares Mechanical Engineering Year:2016 | Volume:16 | Issue:2 Page(s): 99-110

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Title

A DUAL-TIME IMPLICIT POWER-LAW PRECONDITIONING METHOD FOR SOLVING UNSTEADY INCOMPRESSIBLE FLOWS

Author(s)

DERAZGISOO SEYED MOEIN | AKBARZADEH POORIA | Issue Writer Certificate

Keywords

POWER-LAW PRECONDITIONING METHODQ2

DUAL-TIME SOLUTIONQ1

FINITE VOLUMEQ2

UNSTEADY FLOWQ2

CONVERGENCE SPEEDQ2

Abstract

Aerodynamic study of flows at low Reynolds for special applications such as micro unmanned underwater vehicles, underwater robots and explorers are investigated. In this paper, an improved progressive preconditioning method named POWER-LAW PRECONDITIONING METHOD for analyzing unsteady laminar flows around hydrofoils is presented. In this method, the 2D Navier-Stokes equations are modified by altering the time derivative terms of the governing equations. The preconditioning matrix is adapted from the velocity flow-field by a power-law relation. The governing equation is integrated with a numerical resolution derived from the cell-centered Jameson’s FINITE VOLUME algorithm and a dualtime implicit procedure is applied for solution of UNSTEADY FLOWs. The stabilization is achieved via the second- and fourth-order artificial dissipation scheme. Explicit four-step Runge–Kutta time integration is applied to achieve the steady-state condition. The computations are presented for unsteady laminar flows around NACA0012 hydrofoil at various angles of attack and Reynolds number. Results presented in the paper focus on the velocity profiles, lift and drag coefficient and effect of the POWER-LAW PRECONDITIONING METHOD on CONVERGENCE SPEED. The results show satisfactory agreement with numerical works of others and also indicate that using the power-law preconditioner improves the convergence rate and decreases the computational cost, significantly.

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APA: Copy

DERAZGISOO, SEYED MOEIN, & AKBARZADEH, POORIA. (2016). A DUAL-TIME IMPLICIT POWER-LAW PRECONDITIONING METHOD FOR SOLVING UNSTEADY INCOMPRESSIBLE FLOWS. MODARES MECHANICAL ENGINEERING, 16(2), 99-110. SID. https://sid.ir/paper/178840/en

Vancouver: Copy

DERAZGISOO SEYED MOEIN, AKBARZADEH POORIA. A DUAL-TIME IMPLICIT POWER-LAW PRECONDITIONING METHOD FOR SOLVING UNSTEADY INCOMPRESSIBLE FLOWS. MODARES MECHANICAL ENGINEERING[Internet]. 2016;16(2):99-110. Available from: https://sid.ir/paper/178840/en

IEEE: Copy

SEYED MOEIN DERAZGISOO, and POORIA AKBARZADEH, “A DUAL-TIME IMPLICIT POWER-LAW PRECONDITIONING METHOD FOR SOLVING UNSTEADY INCOMPRESSIBLE FLOWS,” MODARES MECHANICAL ENGINEERING, vol. 16, no. 2, pp. 99–110, 2016, [Online]. Available: https://sid.ir/paper/178840/en

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