Publication Date:
2017-04-04
Description:
First-order moving least-squares are typically used in conjunction with
smoothed particle hydrodynamics in the form of post-processing filters for
density fields, to smooth out noise that develops in most applications of
smoothed particle hydrodynamics. We show how an approach based on
higher-order moving least-squares can be used to correct some of the main
limitations in gradient and second-order derivative computation in classic
smoothed particle hydrodynamics formulations. With a small increase in
computational cost, we manage to achieve smooth density distributions
without the need for post-processing and with higher accuracy in the
computation of the viscous term of the Navier–Stokes equations, thereby
reducing the formation of spurious shockwaves or other streaming effects
in the evolution of fluid flow. Numerical tests on a classic two-dimensional
dam-break problem confirm the improvement of the new approach.
Description:
Published
Description:
622-633
Description:
3.6. Fisica del vulcanismo
Description:
4.3. TTC - Scenari di pericolosità vulcanica
Description:
JCR Journal
Description:
open
Keywords:
Algorithms and implementation, Smoothed particle hydrodynamics, Moving least-squares, Mesh-free
;
04. Solid Earth::04.08. Volcanology::04.08.99. General or miscellaneous
;
05. General::05.01. Computational geophysics::05.01.99. General or miscellaneous
;
05. General::05.05. Mathematical geophysics::05.05.99. General or miscellaneous
Repository Name:
Istituto Nazionale di Geofisica e Vulcanologia (INGV)
Type:
article
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