Accession Number : ADA255609


Title :   Singularities in the Classical Rayleigh-Taylor Flow: Formation and Subsequent Motion


Descriptive Note : Research rept.


Corporate Author : INSTITUTE FOR COMPUTER APPLICATIONS IN SCIENCE AND ENGINEERING HAMPTON VA


Personal Author(s) : Tanveer, S


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/a255609.pdf


Report Date : Aug 1992


Pagination or Media Count : 44


Abstract : This paper is concerned with the creation and subsequent motion of singularities of solution to classical Rayleigh-Taylor flow (two-dimensional inviscid, incompressible fluid over a vacuum). For a specific set of initial conditions, The author gives analytical evidence to suggest the instantaneous formation of one or more singularity(ies) specific point(s) in the unphysical plane, whose locations depend sensitively to small changes in initial conditions in the physical domain. One-half power singularities are created in accordance with an earlier conjecture; however, depending on initial conditions, other forms of singularities also are possible. For a specific initial condition, they follow a numerical procedure in the unphysical plane to compute the motion of a one-half singularity. This computation confirms their previous conjecture that the approach of a one-half singularity towards the physical domain corresponds to the development of a spike at the physical interface. Under some assumptions that appear to be consistent with numerical calculations, they present analytical evidence to suggest that a singularity of the one-half type cannot impinge the physical domain in finite time.


Descriptors :   *TWO DIMENSIONAL , *MOTION , *FLUIDS , *INCOMPRESSIBLE FLOW , *RAYLEIGH TAYLOR INSTABILITY , *INVISCID FLOW , INTERFACES , MATHEMATICAL PREDICTION , SPIKES , NUMERICAL METHODS AND PROCEDURES , PERTURBATIONS , BUBBLES , COMPUTATIONAL FLUID DYNAMICS , VACUUM


Subject Categories : Numerical Mathematics
      Fluid Mechanics


Distribution Statement : APPROVED FOR PUBLIC RELEASE