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Title: Implementation of a simple model for linear and nonlinear mixing at unstable fluid interfaces in hydrodynamics codes

A simple model was recently described for predicting the time evolution of the width of the mixing layer at an unstable fluid interface [J. D. Ramshaw, Phys. Rev. E 58, 5834 (1998); ibid. 61, 5339 (2000)]. The ordinary differential equations of this model have been heuristically generalized into partial differential equations suitable for implementation in multicomponent hydrodynamics codes. The central ingredient in this generalization is a nun-diffusional expression for the species mass fluxes. These fluxes describe the relative motion of the species, and thereby determine the local mixing rate and spatial distribution of mixed fluid as a function of time. The generalized model has been implemented in a two-dimensional hydrodynamics code. The model equations and implementation procedure are summarized, and comparisons with experimental mixing data are presented.
Authors:
Publication Date:
OSTI Identifier:
15006143
Report Number(s):
UCRL-JC-139800
TRN: US200405%%282
DOE Contract Number:
W-7405-ENG-48
Resource Type:
Conference
Resource Relation:
Conference: 2000 Nuclear Explosives Code Development Conference, Oakland, CA (US), 10/23/2000--10/27/2000; Other Information: PBD: 1 Oct 2000
Research Org:
Lawrence Livermore National Lab., CA (US)
Sponsoring Org:
US Department of Energy (US)
Country of Publication:
United States
Language:
English
Subject:
45 MILITARY TECHNOLOGY, WEAPONRY, AND NATIONAL DEFENSE; 73 NUCLEAR PHYSICS AND RADIATION PHYSICS; 70 PLASMA PHYSICS AND FUSION TECHNOLOGY; DIFFERENTIAL EQUATIONS; HYDRODYNAMICS; IMPLEMENTATION; NUCLEAR EXPLOSIVES; PARTIAL DIFFERENTIAL EQUATIONS; SPATIAL DISTRIBUTION