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Article . 2019
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https://dx.doi.org/10.48550/ar...
Article . 2019
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An Explicit Meshless Point Collocation Solver for Incompressible Navier-Stokes Equations

Authors: George C. Bourantas; Benjamin F. Zwick; Grand R. Joldes; Vassilios C. Loukopoulos; Angus C. R. Tavner; Adam Wittek; Karol Miller;

An Explicit Meshless Point Collocation Solver for Incompressible Navier-Stokes Equations

Abstract

We present a strong form, meshless point collocation explicit solver for the numerical solution of the transient, incompressible, viscous Navier-Stokes (N-S) equations in two dimensions. We numerically solve the governing flow equations in their stream function-vorticity formulation. We use a uniform Cartesian embedded grid to represent the flow domain. We discretize the governing equations using the Meshless Point Collocation (MPC) method. We compute the spatial derivatives that appear in the governing flow equations, using a novel interpolation meshless scheme, the Discretization Corrected Particle Strength Exchange (DC PSE). We verify the accuracy of the numerical scheme for commonly used benchmark problems including lid-driven cavity flow, flow over a backward-facing step and unbounded flow past a cylinder. We have examined the applicability of the proposed scheme by considering flow cases with complex geometries, such as flow in a duct with cylindrical obstacles, flow in a bifurcated geometry, and flow past complex-shaped obstacles. Our method offers high accuracy and excellent computational efficiency as demonstrated by the verification examples, while maintaining a stable time step comparable to that used in unconditionally stable implicit methods. We estimate the stable time step using the Gershgorin circle theorem. The stable time step can be increased through the increase of the support domain of the weight function used in the DC PSE method.

Keywords

stream function-vorticity formulation, QC120-168.85, transient incompressible Navier-Stokes, Fluid Dynamics (physics.flu-dyn), explicit time integration, FOS: Physical sciences, Physics - Fluid Dynamics, Computational Physics (physics.comp-ph), Descriptive and experimental mechanics, meshless point collocation method, Thermodynamics, QC310.15-319, strong form, Physics - Computational Physics

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selected citations
These citations are derived from selected sources.
This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Citations provided by BIP!
popularity
This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
BIP!Popularity provided by BIP!
influence
This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Influence provided by BIP!
impulse
This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
BIP!Impulse provided by BIP!
13
Top 10%
Average
Top 10%
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gold