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Article

Validation of an Eddy-Viscosity-Based Roughness Model Using High-Fidelity Simulations †

Institute of Turbomachinery and Fluid Dynamics, Leibniz University Hannover, An der Universität 1, 30823 Garbsen, Germany
*
Author to whom correspondence should be addressed.
This manuscript is an extended version of our paper published in the Proceedings of the 16th European Turbomachinery Conference (ETC16)—Turbomachinery, Fluid Dynamics and Thermodynamics, Hannover, Germany, 24–28 March 2025; paper No. 144.
Int. J. Turbomach. Propuls. Power 2025, 10(4), 34; https://doi.org/10.3390/ijtpp10040034
Submission received: 15 May 2025 / Revised: 22 May 2025 / Accepted: 16 July 2025 / Published: 2 October 2025

Abstract

In this study, the modeling of rough surfaces by eddy-viscosity-based roughness models is investigated, specifically focusing on surfaces representative of deterioration in aero-engines. In order to test these models, experimental measurements from a rough T106C blade section at a Reynolds number of 400 K are adopted. The modeling framework is based on the k–ω–SST with Dassler’s roughness transition model. The roughness model is recalibrated for the k–ω–SST model. As a complement to the available experimental data, a high-fidelity test rig designed for scale-resolving simulations is built. This allows us to examine the local flow phenomenon in detail, enabling the identification and rectification of shortcomings in the current RANS models. The scale-resolving simulations feature a high-order flux-reconstruction scheme, which enables the use of curved element faces to match the roughness geometry. The wake-loss predictions, as well as blade pressure profiles, show good agreement, especially between LES and the model-based RANS. The slight deviation from the experimental measurements can be attributed to the inherent uncertainties in the experiment, such as the end-wall effects. The outcomes of this study lend credibility to the roughness models proposed. In fact, these models have the potential to quantify the influence of roughness on the aerodynamics and the aero-acoustics of aero-engines, an area that remains an open question in the maintenance, repair, and overhaul (MRO) of aero-engines.
Keywords: roughness; LES; transition modeling; turbine cascade roughness; LES; transition modeling; turbine cascade

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MDPI and ACS Style

Seehausen, H.; Cengiz, K.; Wein, L. Validation of an Eddy-Viscosity-Based Roughness Model Using High-Fidelity Simulations. Int. J. Turbomach. Propuls. Power 2025, 10, 34. https://doi.org/10.3390/ijtpp10040034

AMA Style

Seehausen H, Cengiz K, Wein L. Validation of an Eddy-Viscosity-Based Roughness Model Using High-Fidelity Simulations. International Journal of Turbomachinery, Propulsion and Power. 2025; 10(4):34. https://doi.org/10.3390/ijtpp10040034

Chicago/Turabian Style

Seehausen, Hendrik, Kenan Cengiz, and Lars Wein. 2025. "Validation of an Eddy-Viscosity-Based Roughness Model Using High-Fidelity Simulations" International Journal of Turbomachinery, Propulsion and Power 10, no. 4: 34. https://doi.org/10.3390/ijtpp10040034

APA Style

Seehausen, H., Cengiz, K., & Wein, L. (2025). Validation of an Eddy-Viscosity-Based Roughness Model Using High-Fidelity Simulations. International Journal of Turbomachinery, Propulsion and Power, 10(4), 34. https://doi.org/10.3390/ijtpp10040034

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