000004834 001__ 4834 000004834 005__ 20141119144557.0 000004834 04107 $$aeng 000004834 046__ $$k2002-06-02 000004834 100__ $$aChu, Vincent 000004834 24500 $$aGRAVITY STRATIFIED FLOWS BY LAGRANGIAN BLOCK METHOD 000004834 24630 $$n15.$$pProceedings of the 15th ASCE Engineering Mechanics Division Conference 000004834 260__ $$bColumbia University in the City of New York 000004834 506__ $$arestricted 000004834 520__ $$2eng$$aIn Large Eddy Simulations (LES) of turbulent flows, the required viscosity for energy dissipation at the sub-grid scales is quite small. The sub-grid viscosity is comparable in order of magnitude to the numerical viscosity produced by most of the numerical computa- tional schemes. The need for numerical accuracy is even more important when the buoyancy force is involved in the numerical simulation. Buoyancy is carried by the velocity of the turbulence motion that in turn is driven by the force of the buoyancy. Accurate simulation of the turbulent stratified flows is entirely dependent on the ability of numerical scheme to simulate the chaotic advection of the buoyancy. Because the process is advection dominated, the numerical method must be relatively free of the problems of the numerical diffusion and the unphysical oscillations that many conventional computational schemes have been affected. In this paper, the turbulent plume is simulated by a highly accurate advection scheme known as the Lagrangian Block Method (LBM). 000004834 540__ $$aText je chráněný podle autorského zákona č. 121/2000 Sb. 000004834 653__ $$a 000004834 7112_ $$a15th ASCE Engineering Mechanics Division Conference$$cNew York (US)$$d2002-06-02 / 2002-06-05$$gEM2002 000004834 720__ $$aChu, Vincent$$iAltai, Wihel 000004834 8560_ $$ffischerc@itam.cas.cz 000004834 8564_ $$s325491$$uhttps://invenio.itam.cas.cz/record/4834/files/410.pdf$$yOriginal version of the author's contribution as presented on CD, . 000004834 962__ $$r4594 000004834 980__ $$aPAPER