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  1. Article

    Foreword to the Special Issue on Ejecta

    W. T. Buttler, R. J. R. Williams, F. M. Najjar in Journal of Dynamic Behavior of Materials (2017)

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    Article

    Simulation of Double-Shock Ejecta Production

    We have performed continuum simulations of ejecta production from multiply-shocked metal surfaces. We describe the underlying computational capability, and discuss the results of our calculations. While still ...

    R. J. R. Williams, C. C. Grapes in Journal of Dynamic Behavior of Materials (2017)

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    Article

    Laboratory experiments to study supersonic astrophysical flows interacting with clumpy environments

    A wide variety of objects in the universe drive supersonic outflows through the interstellar medium which is often highly clumpy. These inhomogeneities affect the morphology of the shocks that are generated. T...

    P. A. Rosen, J. M. Foster, B. H. Wilde, P. Hartigan… in Astrophysics and Space Science (2009)

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    Numerical Simulations and Astrophysical Applications of Laboratory Jets at Omega

    We have conducted experiments on the Omega laser at the University of Rochester that have produced jets of supersonic Ti impacting and being deflected by a ball of high density plastic. These mm-sized jets of ...

    R. F. Coker, B. H. Wilde, J. M. Foster, B. E. Blue… in Astrophysics and Space Science (2007)

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    Article

    Photoionized Flows from Magnetized Globules

    Low mass star formation may be triggered by the dynamical effects of radiation fields and winds from massive stars on nearby molecular material. The columns of neutral material observed at the edges of many Hii r...

    R. J. R. Williams in Astrophysics and Space Science (2007)

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    Article

    Recent Experimental Results and Modelling of High-Mach-Number Jets and the Transition to Turbulence

    In recent years, we have carried out experiments at the University of Rochester’s Omega laser in which supersonic, dense-plasma jets are formed by the interaction of strong shocks in a complex target assembly ...

    P. A. Rosen, B. H. Wilde, R. J. R. Williams, J. M. Foster… in Astrophysics and Space Science (2005)

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    Article

    Shock Propagation Through Multiphase Media*

    This paper presents two and three dimensional simulations of the interaction of shocks with media with large numbers of dense inclusions. An approximate model of the interaction of a starburst wind with the su...

    R. J. R. Williams, D. L. Youngs in Astrophysics and Space Science (2005)

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    Article

    The Fine Structures of Planetary Nebulae

    Most theoretical studies of the dynamics of planetary nebulae assume that the slow ejecta from the red-giant or asymptotic giant branch phase of evolution of the central star is distributed smoothly. We consid...

    J.E. Dyson, T.W. Hartquist, M.P. Redman, R.J.R. Williams in Astrophysics and Space Science (2000)

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    Article

    Structure and Stability of Ionization Fronts

    The study of the dynamics of ionization fronts has moved far since Franz Kahn helped define the field in the 1950s. Nevertheless, the stability of the fronts and the nature of elephant trunks and bright rims i...

    R.J.R. Williams, J.E. Dyson, K. Pavlakis in Astrophysics and Space Science (2000)

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    Article

    Some Recent Results on MHD Shocks and Winds

    Work on the rotation of the magnetic field around the shock propagation direction in an oblique shock in a dusty medium is reviewed. A significant observational consequence is that the rotation lowers the mini...

    T.W. Hartquist, J.E. Dyson, R.J.R. Williams… in Astrophysics and Space Science (2000)

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    Article

    Line forming regions in active galaxies and their nuclei

    The spectra of active galaxies and their nuclei are rich in emission and absorption line features. A major aim of present research is the development of self-consistent hydrodynamic models for the production o...

    J. E. Dyson, R. J. R. Williams, J. J. Perry in Astrophysics and Space Science (1996)

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    Article

    Wide intermediate scale structures in mass-loaded flows

    We showed in earlier work that a clump embedded in tenuous plasma, which is flowing subsonically relative to the clump, will develop a long thin tail whether the gas in the tail behaves adiabatically or isothe...

    T. W. Hartquist, J. E. Dyson, R. J. R. Williams in Astrophysics and Space Science (1996)

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    Article

    All's knot quiet on the recombination front

    Molecular clouds are clumpy on length scales down to the limits of observational resolution. At least some ultracompactHii regions (UCHiiR) may result from the interaction of a young early type star and this type...

    M. P. Redman, R. J. R. Williams, J. E. Dyson in Astrophysics and Space Science (1995)

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    Article

    Flows and shocks in active galaxies and their nuclei

    Observations of active galactic nuclei imply that shocks must be an essential and important part of their structure. We outline the basic observations, and discuss those features which must be addressed by any...

    J. E. Dyson, R. J. R. Williams, J. J. Perry in Astrophysics and Space Science (1995)

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    Article

    Review ofmass-transfer induced activity in galaxies, I. Shlosman (ed.), ISBN 0 521 47195 8), cambridge university press, xx+504 pp., L45 hb, $69.95

    R. J. R. Williams in Astrophysics and Space Science (1995)

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    Article

    Book reviews

    A. A. Watson, R. J. R. Williams, T. J. Millar in Astrophysics and Space Science (1994)