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Effect of artificial viscosity on shocked particle-laden flows for staggered grid Lagrangian methods

Journal Article · · Computational Particle Mechanics
Shocked particle-laden flows are important to many natural and industrial processes. When simulating these systems, artificial viscosity is often required to prevent numerical artifacts, such as ringing, from arising in the pressure and density fields. The linear and quadratic coefficients of the artificial viscosity determine the amount of smoothing that occurs in these fields. For particle-laden flows, however, many of the fluid–particle interaction forces, for example, the pressure gradient force and unsteady forces, depend on gradients in the fluid fields. Furthermore, while the shock passes over a particle, these forces can be more dominant than drag. This means that the artificial viscosity coefficients affect how a particle and fluid interact when simulating shocked particle systems. Here this effect is investigated for isolated particles and for a particle curtain using a staggered grid Lagrangian approach. The artificial viscosity coefficients have a significant impact on the maximum force that a fluid imparts to a particle, which is important for determining whether a particle will break up in response to the shock. Furthermore, it is found that the density ratio between the particle and the fluid is important in determining whether the artificial viscosity coefficients have a significant impact on the particle’s motion.
Research Organization:
Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
Sponsoring Organization:
USDOE National Nuclear Security Administration (NNSA)
Grant/Contract Number:
89233218CNA000001
OSTI ID:
2502121
Alternate ID(s):
OSTI ID: 2999921
Report Number(s):
LA-UR--24-20252; 10.1007/s40571-024-00890-0
Journal Information:
Computational Particle Mechanics, Journal Name: Computational Particle Mechanics Journal Issue: 3 Vol. 12; ISSN 2196-4378; ISSN 2196-4386
Publisher:
Springer NatureCopyright Statement
Country of Publication:
United States
Language:
English

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