Influence of baroclinic vorticity production on unsteady drag coefficient in shock–particle interaction

Fujisawa, K.; Jackson, T. L.; Balachandar, S.

doi:10.1063/1.5055002

Influence of baroclinic vorticity production on unsteady drag coefficient in shock–particle interaction

Journal Article · Thu Feb 21 23:00:00 EST 2019 · Journal of Applied Physics

DOI:https://doi.org/10.1063/1.5055002· OSTI ID:1614518

Fujisawa, K. ^[1]; Jackson, T. L. ^[2]; Balachandar, S. ^[2]

Univ. of Florida, Gainesville, FL (United States); DOE/OSTI
Univ. of Florida, Gainesville, FL (United States)

The influence of baroclinic vorticity production on the unsteady drag coefficient in shock–particle interaction is numerically studied in this work. Numerical simulations are performed for shock–particle interaction utilizing a high–resolution axisymmetric solver for the Euler equations that allows for multi-material interface and shock propagation in both the particle and surrounding medium. We consider an aluminum particle in nitromethane and allow for particle deformation. We compute the vorticity production and unsteady drag coefficient as a function of time to explain the complex physical mechanisms that occur during shock–particle interaction. We observe baroclinic vorticity production as the shock propagates over the particle and find that the vorticity is primarily generated at the surface of the particle. After the passage of the shock over the particle, the generated vortex traverses downstream, thus creating a sharpened particle edge and low pressure on the downstream side of the particle, followed by the trapping of the vortex at the particle edge. These mechanisms lead to the generation of a quasi-steady drag force even after the passage of the shock, thus suggesting the importance of baroclinic vorticity production to the unsteady drag coefficient. Finally, we compute the unsteady drag coefficient for various shock Mach numbers and particle ellipticities.

View Accepted Manuscript (DOE)

Research Organization:: Univ. of Florida, Gainesville, FL (United States)

Sponsoring Organization:: USDOE National Nuclear Security Administration (NNSA); Defense Threat Reduction Agency (DTRA)

Grant/Contract Number:: NA0002378

OSTI ID:: 1614518

Journal Information:: Journal of Applied Physics, Journal Name: Journal of Applied Physics Journal Issue: 8 Vol. 125; ISSN 0021-8979

Publisher:: American Institute of Physics (AIP)Copyright Statement

Country of Publication:: United States

Language:: English

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71 CLASSICAL AND QUANTUM MECHANICS
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Influence of baroclinic vorticity production on unsteady drag coefficient in shock–particle interaction

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