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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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    Chapter

    Spectral Modeling in Astrophysics—The Physics of Non-equilibrium Clouds

    Collisional-radiative spectral modeling plays a central role in astrophysics, probing phenomena ranging from the chemical evolution of the Universe to the energy production near supermassive black holes in dis...

    G. J. Ferland, R. J. R. Williams in Modern Methods in Collisional-Radiative Mo… (2016)

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    Chapter and Conference Paper

    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… in High Energy Density Laboratory Astrophysic… (2010)

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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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    Article

    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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    Chapter and Conference Paper

    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 HI...

    R. J. R. Williams in High Energy Density Laboratory Astrophysics (2007)

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    Chapter

    MHD Ionization Fronts

    The structure and evolution of Hii regions has been described by Will Henney in this volume. Young massive stars emit copious fluxes of ultraviolet radiation, forming regions of almost entirely ionized gas in ...

    R.J.R. Williams in Diffuse Matter from Star Forming Regions to Active Galaxies (2007)

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    Chapter and Conference Paper

    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… in High Energy Density Laboratory Astrophysics (2007)

  10. No Access

    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)

  11. No Access

    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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    Chapter

    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 High Energy Density Laboratory Astrophysics (2005)

  14. No Access

    Chapter

    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… in High Energy Density Laboratory Astrophysics (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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    Chapter

    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 Astrophysical and Laboratory Plasmas (1996)

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