Investigation of the impact of unsteady turbulence effects on the aeroelastic analysis of a low-pressure turbine rotor blade

[+] Author and Article Information
Jan Philipp Heners

Dachauer Str. 665 Munich / Germany, 80995 Germany janphilipp.heners@mtu.de

Damian M. Vogt

Pfaffenwaldring 6 Stuttgart, 70569 Germany damian.vogt@itsm.uni-stuttgart.de

Christian Frey

Linder Höhe Cologne, 51147 Germany christian.frey@dlr.de

Graham Ashcroft

Linder Höhe Cologne, 51147 Germany graham.ashcroft@dlr.de

1Corresponding author.

Manuscript received October 29, 2018; final manuscript received May 22, 2019; published online xx xx, xxxx. Assoc. Editor: Li He.

ASME doi:10.1115/1.4043950 History: Received October 29, 2018; Accepted May 22, 2019


The impact of the unsteadiness in the considered turbulence quantities on the numerical prediction of the aeroelastic behaviour of a low pressure turbine (LPT) rotor blade is evaluated by means of a numerical study. In this context, one of the main objectives of this work is to compare different nonlinear Harmonic Balance (HB) approaches - one neglecting and one considering the unsteadiness in the employed turbulence models - with a conventional nonlinear solver of the unsteady Reynolds-averaged Navier-Stokes (URANS) equations in the time domain.

In order to avoid unphysical oscillations in the turbulence quantities caused by Gibbs phenomenon in the chosen HB-approach, a filter method based on the Lanczos-filter is developed. The developed filter method is applied in the course of the HB-simulations considering the unsteadiness in the underlying turbulence model. Furthermore, the impact of its application on the solution of the flow field and on the unsteady surface pressure of the rotor blade in particular, is discussed in the context of this work.

Copyright © 2019 by ASME
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