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Published September 1982 | Published
Journal Article Open

Nonlinear effects of multifrequency hydrodynamic instabilities on ablatively accelerated thin shells


Two-dimensional numerical simulations of ablatively accelerated thin-shell fusion targets, susceptible to rupture and failure by Rayleigh–Taylor instability, are presented. The results show that nonlinear effects of Rayleigh–Taylor instability are manifested in the dynamics of the "bubble" (head of the nonlinear fluid perturbation) rather than in the dynamics of the spike (tail of the perturbation). The role of multiwavelength perturbations on the shell is clarified, and rules are presented to predict the dominant nonlinear mode-mode interactions which limit shell performance. It is also shown that the essential dynamics of strongly driven flows are governed by the classical Rayleigh–Taylor instability of an ideal, incompressible, thin fluid layer.

Additional Information

© 1982 American Institute of Physics Received 24 August 1981; accepted 20 May 1982 This work partially supported by the following sponsors: Exxon Research and Engineering Company, General Electric Company, Northeast Utilities, New York State Energy Research and Development Authority, The Standard Oil Company (Ohio), The University of Rochester, and Empire State Electric Energy Research Corporation. This work is also supported by the U.S. Department of Energy inertial fusion project under contract No. DE-AC08-80DP40124. Major support for the boundary integral calculations was provided by the Theoretical and Applied Theoretical Physics Divisions of the Los Alamos National Laboratory of the University of California under contract to the United States Department of Energy. Partial support was given by the Office of Naval Research under Contract No. N00014-77-C-0138, and under Subcontract No. 9245009 with the Lawrence Livermore National Laboratory.

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