Abstract
In the present study, a fractional three-step P2P1 finite element method (FEM) for solving the unsteady incompressible Navier-Stokes equations, which is a variation of P1P1 four-step splitting FEM [1], was compared with conventional one-step time-integration schemes in terms of the CPU time and convergence characteristics of an iterative solver by the solution of some benchmark problems. One-step time-integration schemes were temporarily discretized by either the Crank-Nicolson or the Adams-Bashforth method. Fractional three-step P2P1 FEM consists of three steps: a non-linear momentum equation with the pressure in the previous time step is solved to obtain an intermediate velocity field by the Crank-Nicolson method in the first step and another intermediate velocity field is calculated using the pressure in the previous time step in the second step, and a divergence-free constraint is imposed in the last step to update the pressure field, in which a symmetric saddle-point type matrix (SPTM) is solved. It was shown that the fractional three-step method is more efficient than one-step time-integration schemes because a symmetric SPTM is assembled only once during the entire computation and solved once at each time-step; further, the cost of solving the nonlinear momentum equation in a fully-implicit manner is relatively low. Furthermore, the proposed method was found to be more stable than one-step time-integration schemes as it provided stable solutions at higher CFL numbers.
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Abbreviations
- u :
-
Velocity vector
- ρ :
-
Pressure
- σ :
-
Stress tensor
- μ :
-
Dynamic viscosity
- ρ :
-
Density
- W :
-
Test functions
- q :
-
Weighting function of the continuity equation
- Re :
-
Reynolds number
- τ :
-
Shear stress
- Δt :
-
Time increment
- St :
-
Strouhal number
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This study was supported by the Research Program funded by the Seoul Tech (Seoul National University of Science and Technology).
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Sang T. Ha received his Ph.D. in Mechanical Engineering at Seoul National University of Science and Technology, Korea. He is currently a researcher in the Department of Mechanical Engineering at Le Quy Don technical University, Ha noi, Viet Nam. His research interests include computational fluid dynamics, fluid-structure interaction and multi-grid method.
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Cho, M.H., Ha, S.T., Yoo, J.Y. et al. A numerical experiment on the stability and convergence characteristics of some splitting mixed-finite element methods for solving the incompressible Navier-Stokes equations. J Mech Sci Technol 37, 4729–4740 (2023). https://doi.org/10.1007/s12206-023-0827-5
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DOI: https://doi.org/10.1007/s12206-023-0827-5