Model for turbulent momentum and heat transport in large rod bundles. [LMFBR]

Abstract

Distribution Category: R e a c t o r C o r e Systems (uC -79e) ANL -7 7 -7 3 NOTICE ARGONNE NATIONAL LABORATORY I 9700 South C as s Avenue Argonne, Illinois 60439 This report contains information of a preliminary nature and was prepared primarily for internal use at the origjnating installation. It is subject to revision or correction and therefore does not represent a final report. It is passed to the recipient in confidence and should not be abstracted or further disclosed without the approval of the originating installation or USDOE NOTICE ma report was prepared as an account of work sponsored by the Utiited Slates Government. Neither the United States nor the United States Department of Energy, nor any of their employees, nor any of their contractors, subcontractors. or their employees, makes any warranty. express or implied, or assumes any legal liability or rtsponsibdity fol the accuracy, cOmpICtCnesS or usefulness of any informat~on. apparatus. product or process disclosed, or reprevnts that its use would not DISCLAIMER

FD Wake Modelling with a BEM Wind Turbine Sub-Model

“…The classical k − ε turbulence model of Launder and Spalding (1972) will be used, and sub-grid models of turbulent kinetic energy (TKE) and its rate of dissipation are implemented, see Sha and Launder (1979); Sand and Salvesen (1994).…”

“…The sub-grid models for generation of TKE and its rate of dissipation are basically taken from the flow model in large rod bundles by Sha and Launder (1979). It is assumed that the production rate of TKE, G, and its rate of dissipation ε are integrated over the wake of the wind turbine and distributed over the near field.…”

“…The tangential and normal reaction forces from the wind turbine blades are distributed on the control volumes (CVs) at the wind turbine rotor location as sources in the conservation equations of momentum. The classical k − ε turbulence model of Launder and Spalding (1972) is implemented with sub-grid turbulence (SGT) model, see Sha and Launder (1979) and Sand and Salvesen (1994).…”

“…The tangential and normal reaction forces from the wind turbine blades are distributed on the control volumes (CVs) at the wind turbine rotor location as sources in the conservation equations of momentum. The classical k − ε turbulence model of Launder and Spalding (1972) is implemented with sub-grid turbulence (SGT) model, see Sha and Launder (1979) and Sand and Salvesen (1994).Steady state CFD simulations were compared with flow and turbulence measurements in the wake of a model scale wind turbine, see Krogstad and Eriksen (2011). The simulated results compared best with experiments when stalling (boundary layer separation on the wind turbine blades) did not occur.…”

Modified porosity approach and laminar flamelet modelling for advanced simulation of accidental explosions

“…The main advantage is that the technique allows the use of a mesh which is much coarser than that required to resolve the fine scales of the geometry, which in turn permits the use of a less detailed specification of the geometry. The porosity model was subsequently improved, and extra sources of turbulence and resistance to fluid motion were incorporated, as reported by Sha and Launder (1979). The PDR model has been used in several different codes for explosion and fire modelling with regard to safety applications as highlighted by Savill and Solberg (1994), Vianna (2005) and Oliveira, Huser, and Vianna (2005).…”