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Harmonic Balance Method for Contra-Rotating Propellers

In order to reduce the total time-to-solution, while preserving the required time resolution resulting from the periodicity of the flow in the case of a set of Contra-Rotating Propellers (CRP), it is possible to use the spectral methods. These methods are based on the conversion of the required quantities from the time domain to the frequency domain and vice versa. The Harmonic Balance Method (HB) [1] is one of the spectral methods, which is often used in the simulations of rotating machinery (turbomachines, propellers, etc.). Harmonic balance is based on solving a number of stationary equations, which are used to calculate the solution solved for the entire period T. The accuracy of the solution depends on the selected number of harmonics. Simulations were performed for the purpose of validating the use of HB for simulations of contra-rotating propellers [2]. The analysis of the results was based on the available results of steady-state and transient simulations [3]. The analysis showed that the use of a lower number of harmonics produce higher accuracy results when compared to the steady-state simulations, while for the results to be closer to the results of transient simulations, a higher number of harmonics is required.

Harmonic Balance Method ; OpenFOAM ; Contra-Rotating-Propellers

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