Abstract
Harmonic Balanced Large-Eddy Simulation(HB-LES) is proposed for the efficient high-fidelity simulation of the unsteady flows with low non-dimensional frequency. Harmonic balance method for unsteady RANS simulation is originally introduced to large-eddy simulation, utilizing the difference in timescales between the period flow and the turbulent fluctuations. Periodic flow and turbulent fluctuation are computed without disregarding their nonlinear mutual interference by iterating short-time large-eddy simulation and harmonic balance method. Evaluation computations of HB-LES are performed for Srokes Boundary Layer at Reynolds number of 1790 and pitching NACA0012 airfoil. The accuracy and computational efficiency of the HB-LES are discussed by comparing with the conventional large-eddy simulation and experimental results.
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