Turbulence simulation in tube bundle geometries using the dynamic subgrid-scale model

The dynamic subgrid-scale (DSGS) closure model is used in a large eddy simu lation computer program for incompressible isothermal flows. One of the adv antages of the DSGS model is the exclusion of a model coefficient. This mod el coefficient is evaluated dynamically at each nodal location for a given time step by filtering operations on the grid level and a test filter level . A nonstaggered array tube bundle geometry arrangement is considered in do ubly periodic boundary conditions for two-dimensional simulations at high R eynolds number. Results of the DSGS simulation are obtained in the form of power spectral densities and visualization of flow characteristics. The DSG S model simulation results are compared to the Smagorinsky eddy viscosity m odel simulation and available experimental data. The DSGS model simulation is found to be in good agreement with spectral data available from experime nts in similar bundle arrangements. Coherent eddy structures were observed. Body forces acting on the tubes showed satisfactory characteristics. integ ral length and timescales are evaluated using correlation functions that de scribe the turbulence structure. The applicability of large eddy simulation to complex engineering flow situations has been shown using the DSGS model with applications to steam generator bundles for understanding of flow ind uced vibration problems revealing the physical phenomena of the flow.