engleski

The Harmonic Balance Method in OpenFOAM

The Harmonic Balance method for incompressible, turbulent periodic flows is presented in this paper. Using the Fourier series as a decomposition method for primitive variables, the transformation from a single transient problem to a number of coupled steady state snapshots is achieved. Depending on the number of harmonics in the Fourier series, n, a set of 2n + 1 coupled equations is assembled, yielding the solution for the whole representative period rather than a single time instant. The method is implemented in the Finite Volume framework within the open source software OpenFOAM and designed for turbomachinery applications. Two turbomachinery test cases are presented in this paper, a KP505 propeller in open water and ERCOFTAC centrifugal pump. Additionally, a CPU time comparison will be presented, demonstrating the speed-up achieved by using Harmonic Balance.

Harmonic Balance ; fourier ; openFoam ; foam-extend

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