Spalart-Allmaras (S-A) model based Delayed Detached Eddy Simulation (DDES) is performed to investigate the flow field in a compressor cascade (NACA64A-905) with experimental data for calibration. The value of the modeling coefficient CDES in DDES is open for revision and depends heavily on the numerical schemes. The effects of CDES on the DDES results are studied and an optimal CDES value is estimated for the specific case, with MUSCL reconstructed Roe scheme incorporated in in-house CFD codes. CDES value of 0.2 is turned out reliable concerning both accuracy and convergence. S-A model is also performed for comparison. Results from different methods indicate that the time-averaged results by DDES with CDES of 0.2 are more consistent with the experimental results than those by S-A model. The instantaneous flow field predictions show that DDES is well capable of capturing the unsteady features of the cascade flow, especially the wake mixing process.

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