Eventos Anais de eventos
COBEM 2017
24th ABCM International Congress of Mechanical Engineering
ANALYSIS OF THE INDEPENDENCE OF THE MESH REFINAMENT IN A THREE-DIMENSIONAL NUMERICAL SIMULATION OF A VERTICAL THERMAL TANK
Submission Author:
Gilberto Augusto Amado Moreira , PB
Co-Authors:
Gilberto Augusto Amado Moreira
Presenter: Gilberto Augusto Amado Moreira
doi://10.26678/ABCM.COBEM2017.COB17-2603
Abstract
his paper aims to analyze a thermal influence of a vertical cylindrical reservoir, it was verified an influence of the refinement of the computational mesh numerical simulation results, through the technical norm ASME VV 20, for a thermal tank with internal diameter of 0.42 m Height Of 0.57m (79L). Three meshes were compared on the basis of a methodology used by Adolfo [1] in his studies. These features 96,591 and 425,367, 271,898 and 1,308,368, and 851,837 and 4,379,079, the number of nodes and volumes, respectively. The boundary conditions adopted were: Flow: Transient; Buoyancy Model: Boussinesq approximation; Time step: 1s; Condition of walls: Top: No slip / adiabatic; Base: h = 06 [Wm / K]; Lateral of tank: h = 10 [Wm / K] / ambient temperature as a function of time; Initial conditions: Initial velocity and temperature range of 82 oC. Total simulation time: 18000s. The turbulence model SST (shear stress transport) was used and iterations were obtained at a minimum of 0.001, with a maximum of 100 iterations for each step of time. The results of the numerical simulations of fluid dynamics were applied to the Grid Convergence Index (GCI). Finally, the model was validated with the experimental works by Oliveski [3] and with the ones by Savick [2].
Keywords
Thermal Tanks, CFD, Thermal Stratification
