Numerical study of flow and noise predictions for tandem cylinders using incompressible improved delayed detached eddy simulation combined with acoustic perturbation equations

The method of combining incompressible hybrid Reynolds average Navier–Stokes/large eddy simulation (RANS/LES) with an acoustic perturbation equation was studied to accurately predict the flow and noise performances in NASA tandem cylinder experiments. In this approach, waves simultaneously propagate time domain unsteady turbulent flow. experiment performed under condition a number 1.66 × 105, based on diameter, which provided detailed surface pressure field measurements. improved delayed detached (IDDES) model established study consistent experimental results, except for behind rear cylinder, caused by early separation relative experiment. results showed that dominated radiation, indicated fluctuation wake interference greater than vortex shedding. Acoustic predictions were also obtained using analogy approach FH-W method. Three kinds integral surfaces (PS-open, PS-close, IPS) made Ffowcs Williams–Hawkings This wavenumber decomposition could be utilised quantify mechanisms related convection sound propagation. An IDDES predicting near-field far-field established, applied practical engineering applications.