Abstract
Numerical calculation of subcritical flow in tube bundles is a difficult task since transitional effects as well as vortex shedding are important characteristics of the flow field. In the present paper a time dependent simulation using a subgrid scale model is performed in two dimensions for the subcritical flow through a staggered tube bundle. Previous time dependent simulations of the same flow using the k–ε turbulence model unfortunately lead to a steady state solution, which underpredicted turbulence quantities and recirculation lengths. Thus a novel approach is introduced, using a subgrid scale model for the calculation of the eddy viscosity. The methodology that is used strongly resembles a large eddy simulation even though it is performed in two dimensional space. A filtering procedure is used to remove the vortex shedding frequency from the velocity data thus allowing a calculation of the turbulence fluctuations. Calculated vortex shedding frequencies, periodic and turbulence velocity fluctuations and integral time scales are in good agreement with experimental measurements.
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