Thermodynamic correction of numerical diffusion in WCSPH method

The SPH method has been used successfully for the numerical simulation of hydrodynamic flows. CEDEX has developed its own SPH model, SPHERIMENTAL for quasi-compressible flow, with which several studies of calibration have been performed. Problems of numerical diffusion have been observed in simulati...

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Bibliographic Details
Published in:Ingeniería del agua 2015-01, Vol.19 (1), p.1-16
Main Authors: David López Gómez, Vicente Cuellar Moro, Rubén Díaz Martínez
Format: Article
Language:Spanish
Subjects:
Dam Break
Difusión numérica
SPH
Turbulencia
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Summary:The SPH method has been used successfully for the numerical simulation of hydrodynamic flows. CEDEX has developed its own SPH model, SPHERIMENTAL for quasi-compressible flow, with which several studies of calibration have been performed. Problems of numerical diffusion have been observed in simulations of variable transient regime, which increase the entropy of the system and damp the movement of the fluid. It has been used a dambreak test case (Lobovsky, 2013) in which this effect has been noted. It is necessary to take care of the boundary conditions, the correct spatial discretization of the fluid and to use a suitable turbulence model to obtain an accurate numerical simulation, but even so, excessive energy dissipation occurs. The causes of this problem have been analyzed in this paper, and a correction is proposed.
ISSN:1134-2196
1886-4996
DOI:10.4995/ia.2015.3140