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Enhanced Turbomachinery Capabilities for foam-extend: Development and Validation

Turbomachinery simulations represent one of the most challenging fields in Computational Fluid Dynamics (CFD). In the recent years, the general CFD ca- pabilities of foam-extend have been extended by introducing and maintaining addi- tional features specifically needed for turbomachinery applications, with the aim of offering a high quality CFD tool for the study of rotating machinery. This work presents the implementation and validation of new capabilities for tur- bomachinery with foam-extend, a community driven fork of OpenFOAM. The for- mulation of energy equation more convenient for turbomachinery compressible ap- plications is the rothalpy equation. Rothalpy is a physical quantity conserved over a blade row, stator or rotor, but not over a stage, both stator and rotor. It is fun- damental to take into account that the value of rothalpy is not continuous across the rotor-stator interface due to the change of rotational speed between zones. The rothalpy equation has been derived for both relative and absolute frame of reference, showing that additional terms appear in absolute frame of reference. Moreover, ad- ditional functionality has been added to the rotor-stator interface boundary condi- tions General Grid Interface (GGI), partial overlapGGI and Mixing Plane Interface in order to account for the rothalpy jump. The development of these new capabili- ties and their validation are shown as well as industrial applications of compressible turbomachinery flows.

Harmonic Balance, fourier, openFoam , foam-extend

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