Accession Number : ADA255860


Title :   Numerical Study of the Small Scale Structures in Boussinesq Convection


Descriptive Note : Contractor rept.


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


Personal Author(s) : E, Weinan ; Shu, Chi-Wang


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/a255860.pdf


Report Date : Aug 1992


Pagination or Media Count : 40


Abstract : Two-dimensional Boussinesq convection is studied numerically using two different methods: a filtered pseudospectral method and a high order accurate ENO scheme. The issue whether finite time singularity occurs for initially smooth flows is investigated. The numerical results suggest that the collapse of the bubble cap reported by Pumir and Siggia is unlikely to occur in resolved calculations. The strain rate corresponding to the intensification of the density gradient across the front saturates at the bubble cap. We also found that the cascade of energy to small scales is dominated by the formulation of thin and sharp fronts across which density jumps.


Descriptors :   *CONVECTION , *BUBBLES , DENSITY , FORMULATIONS , STRAIN RATE , GRADIENTS , COLLAPSE , TIME , ENERGY , RATES


Subject Categories : Fluid Mechanics


Distribution Statement : APPROVED FOR PUBLIC RELEASE