000186880 001__ 186880
000186880 005__ 20190522142438.0
000186880 0247_ $$2doi$$a10.1017/jfm.2012.399
000186880 022__ $$a0022-1120
000186880 02470 $$2ISI$$a000310881500018
000186880 037__ $$aARTICLE
000186880 245__ $$aSimulations of a double-diffusive interface in the diffusive convection regime
000186880 260__ $$c2012$$bCambridge University Press$$aNew York
000186880 269__ $$a2012
000186880 300__ $$a26
000186880 336__ $$aJournal Articles
000186880 500__ $$aNational Licences
000186880 520__ $$aThree-dimensional direct numerical simulations are performed that give us an in-depth account of the evolution and structure of the double-diffusive interface. We examine the diffusive convection regime, which, in the oceanographically relevant case, consists of relatively cold fresh water above warm salty water. A 'double-boundary-layer' structure is found in all of the simulations, in which the temperature (T) interface has a greater thickness than the salinity (S) interface. Therefore, thin gravitationally unstable boundary layers are maintained at the edges of the diffusive interface. The TS-interface thickness ratio is found to scale with the diffusivity ratio in a consistent manner once the shear across the boundary layers is accounted for. The turbulence present in the mixed layers is not able to penetrate the stable stratification of the interface core, and the TS-fluxes through the core are given by their molecular diffusion values. Interface growth in time is found to be determined by molecular diffusion of the S-interface, in agreement with a previous theory. The stability of the boundary layers is also considered, where we find boundary layer Rayleigh numbers that are an order of magnitude lower than previously assumed.
000186880 6531_ $$adouble diffusive convection
000186880 6531_ $$aocean processes
000186880 6531_ $$astratified flows
000186880 700__ $$uEAWAG Swiss Fed Inst Aquat Sci & Technol, CH-6047 Kastanienbaum, Switzerland$$aCarpenter, J. R.
000186880 700__ $$uEAWAG Swiss Fed Inst Aquat Sci & Technol, CH-6047 Kastanienbaum, Switzerland$$aSommer, T.
000186880 700__ $$g149162$$aWüest, A.$$0246424
000186880 773__ $$j711$$tJournal Of Fluid Mechanics$$q411-436
000186880 8564_ $$uhttps://infoscience.epfl.ch/record/186880/files/S0022112012003990.pdf$$zPUBLISHER'S VERSION$$s2639431
000186880 909C0 $$xU12616$$0252474$$pAPHYS
000186880 909CO $$particle$$pENAC$$ooai:infoscience.tind.io:186880
000186880 917Z8 $$x221818
000186880 937__ $$aEPFL-ARTICLE-186880
000186880 973__ $$rREVIEWED$$sPUBLISHED$$aEPFL
000186880 980__ $$aARTICLE