Comparison of DES turbulence models with the flow around circular cylinder at Re_D=3900

Based on the requirements of simulating the flow around spray bar installed in ground based icing test facilities, the accuracy of three Detached Eddy Simulation (DES) turbulence models, including Spalart-Allmaras DES, Realizable k-ε DES, and Shear Stress Transport k-ω DES, were examined through the comparison and analysis of instantaneous flow characteristics and flow statistic parameters obtained from a three-dimensional subcritical flow around circular cylinder at Re_D=3900. It is found that: (a) from the point of instantaneous flow characterization, the k-ω RANS (Reynolds Averaged Navier-Stokes) branch also has remarkable influence on the accuracy of SST k-ω DES except k-ε RANS branch, (b) from the point of error range of flow statistic parameters, the size of recirculation region L_rec and mimimum streamwise velocity u_min are the key parameters which can reflect the accuracy of numerical simulation on flow around circular cylinder to some extend, (c) compared comprehensively, the predicted values from SST k-ω DES among three DES models give a relatively closer agreement with experimental data, which indicate that it has the potential of applying to the calculation of wake turbulence generated from spray bar system installed in ground based icing test facilities.