Topic
Finite difference method
About: Finite difference method is a research topic. Over the lifetime, 21603 publications have been published within this topic receiving 468852 citations. The topic is also known as: Finite-difference methods & FDM.
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TL;DR: In this article, a finite difference approximation of the full Navier-Stokes equations and explicit tracking of the interface between the fluids is used to simulate three-dimensional flows of two or more immiscible fluids separated by a sharp interface with finite surface tension.
168 citations
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01 Jan 1990
TL;DR: The Difference Calculus First-Order Difference Equations Linear Difference Equation with Constant Coefficients Linear Partial Different Equations (LPDE) Nonlinear Difference Equational Problems.
Abstract: The Difference Calculus First-Order Difference Equations Linear Difference Equations Linear Difference Equations with Constant Coefficients Linear Partial Difference Equations Nonlinear Difference Equations Problems Appendix Notes and References Bibliography Index
168 citations
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TL;DR: In this article, a constrained interpolation profile (CIP) method is adopted as the base scheme for the model and the wave-body interaction is treated as a multiphase problem, which has liquid (water), gas (air), and solid (wavemaker and floating body) phases.
Abstract: A CFD model is proposed for numerical simulations of extremely nonlinear free-surface flows such as wave impact phenomena and violent wave–body interactions. The constrained interpolation profile (CIP) method is adopted as the base scheme for the model. The wave–body interaction is treated as a multiphase problem, which has liquid (water), gas (air), and solid (wave-maker and floating body) phases. The flow is represented by one set of governing equations, which are solved numerically on a nonuniform, staggered Cartesian grid by a finite-difference method. The free surface as well as the body boundary are immersed in the computation domain and captured by different methods. In this article, the proposed numerical model is first described. Then to validate the accuracy and demonstrate the capability, several two-dimensional numerical simulations are presented, and compared with experiments and with computations by other numerical methods. The numerical results show that the present computation model is both robust and accurate for violent free-surface flows.
168 citations
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TL;DR: This method improves the accuracy of split-step finite difference method by introducing a compact scheme for discretization of space variable while this improvement does not reduce the stability range and does not increase the computational cost.
167 citations
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TL;DR: In this article, analytical solutions for the effect of squeeze film damping on a MEMS torsion mirror were derived under the assumption of small displacements, and the damping torques based on both the analytical modeling and the numerical modeling were then used in the equation of motion of the torsions mirror which is solved by the Runge-Kutta numerical method.
Abstract: This paper presents analytical solutions for the effect of squeeze film damping on a MEMS torsion mirror. Both the Fourier series solution and the double sine series solution are derived for the linearized Reynold equation which is obtained under the assumption of small displacements. Analytical formulae for the squeeze film pressure variation and the squeeze film damping torque on the torsion mirror are derived. They are functions of the rotation angle and the angular velocity of the mirror. On the other hand, to verify the analytical modeling, the implicit finite difference method is applied to solve the nonlinear isothermal Reynold equation, and thus numerically determine the squeeze film damping torque on the mirror. The damping torques based on both the analytical modeling and the numerical modeling are then used in the equation of motion of the torsion mirror which is solved by the Runge-Kutta numerical method. We find that the dynamic angular response of the mirror based on the analytical damping model matches very well with that based on the numerical damping model. We also perform experimental measurements and obtain results which are consistent with those obtained from the analytical and numerical damping models. Although the analytical damping model is derived under the assumption of harmonic response of the torsion mirror, it is shown that with the air spring effect neglected, this damping model is still valid for the case of nonharmonic response. The dependence of the damping torque on the ambient pressure is also considered and found to be insignificant in a certain regime of the ambient pressure. Finally, the convergence of the series solutions is discussed, and an approximate one term formula is presented for the squeeze film damping torque on the torsion mirror.
167 citations