Rank-n NonLinear Harmonic Method

    Mateus Teixeira     Webinar Recording     09.09.2020



The flow field in turbomachinery is dominated by inherently unsteady flow features such as blade-row interactions, blade vibration, inlet distortions, or high thermal gradients. Perturbations due to propulsion-airframe integration, aircraft maneuvers, crosswind, and temperature non-uniformities coming from the outlet of combustors are just a few of the many sources that can undermine the performance, stability, and durability of gas turbine engines.

NUMECA's Nonlinear Harmonic method (NLH) enables a better understanding of the propagation of flow non-uniformities into turbomachinery components by accurately and efficiently modeling turbomachinery configurations that are subject to periodic variations.
This webinar will cover the latest development of the NLH method: the rank-n. This new feature unlocks the possibility of simulating unsteady phenomena across a theoretically limitless number of turbomachinery rows: turbomachinery engineers can now benefit from more realistic flow assessments, leading to more precise and reliable designs.


In this 40-minutes webinar we will cover:

  • An introduction to the Nonlinear Harmonic Method.
  • What is the rank-n in the NLH method.
  • A case study of the propagation of hot streaks through several stages of an axial turbine.
  • What’s to come on NUMECA tools for turbomachinery simulations.




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Posted by Mateus Teixeira

Mateus Teixeira is a Turbomachinery CFD Application Engineer at the headquarters of NUMECA International. He received a M.S. degree in Turbomachinery Aeromechanics from KTH, Sweden and a Masters of Engineering degree with specialization in Unsteady Aerodynamics from Duke University, USA. His main work areas comprise turbomachinery aeroelasticity, flow distortion and inter-components interactions.