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Linear perturbation response of self-similar ablative flows relevant to inertial confinement fusion

Published online by Cambridge University Press:  31 July 2008

J.-M. CLARISSE ,
C. BOUDESOCQUE-DUBOIS  and
S. GAUTHIER
J.-M. CLARISSE
Affiliation:
CEA, DIF, F-91297 Arpajon, France
C. BOUDESOCQUE-DUBOIS
Affiliation:
CEA, DIF, F-91297 Arpajon, France
S. GAUTHIER
Affiliation:
CEA, DIF, F-91297 Arpajon, France
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Abstract

A family of exact similarity solutions for inviscid compressible ablative flows in slab symmetry with nonlinear heat conduction is proposed for studying unsteadiness and compressibility effects on the hydrodynamic stability of ablation fronts relevant to inertial confinement fusion. Dynamical multi-domain Chebyshev spectral methods are employed for computing both the similarity solution and its time-dependent linear perturbations. This approach has been exploited to analyse the linear stability properties of two self-similar ablative configurations subjected to direct laser illumination asymmetries. Linear perturbation temporal and reduced responses are analysed, evidencing a maximum instability for illumination asymmetries of zero transverse wavenumber as well as three distinct regimes of ablation-front distortion evolution, and emphasizing the importance of the mean flow unsteadiness, compressibility and stratification.

Type
Papers
Information
Journal of Fluid Mechanics , Volume 609 , 25 August 2008 , pp. 1 - 48
Copyright
Copyright © Cambridge University Press 2008

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References

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