EFFICIENT UNSTEADY SIMULATIONS OF COOLED TURBINES USING HARMONIC BALANCE
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2026
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| _version_ | 1866902234649853952 |
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| author | Muller, Michael Schoffler, Robin Grunwitz, Clemens Morsbach, Christian |
| author_facet | Muller, Michael Schoffler, Robin Grunwitz, Clemens Morsbach, Christian |
| contents | <p>Efficient unsteady simulations of cooled turbines are essential<br>for improving thermal load predictions and optimising turbine<br>design. This study introduces a combined approach of the<br>Harmonic Balance method, a differential Reynolds stress model,<br>and a localised film cooling model, which captures the dominant<br>unsteady effects in high-pressure turbine rotors. Traditional<br>steady-state RANS simulations often under- or over-predict adiabatic<br>wall temperatures and heat transfer coefficients due to the<br>neglect of unsteady interactions.<br>Results show that unsteady effects significantly impact thermal<br>loads, with frequency-domain harmonic balance simulations<br>closely matching high-fidelity time-domain URANS results at a<br>fraction of the computational expense. The localised film cooling<br>model improves accuracy over a coarser volume source model,<br>while the SSG/LRR-log(ω) turbulence model enhances turbulent<br>mixing predictions. This can enable a much better capturing of<br>relevant unsteady effects and turbulent mixing processes in both<br>problem analysis and design, the impact of which would remain<br>unknown using simpler methods.</p> |
| format | Recurso digital |
| id | zenodo_https___doi_org_10_5281_zenodo_20013857 |
| institution | Zenodo |
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| publishDate | 2026 |
| publisher | Zenodo |
| record_format | zenodo |
| spellingShingle | EFFICIENT UNSTEADY SIMULATIONS OF COOLED TURBINES USING HARMONIC BALANCE Muller, Michael Schoffler, Robin Grunwitz, Clemens Morsbach, Christian Turbomachinery Propulsion Heat Transfer <p>Efficient unsteady simulations of cooled turbines are essential<br>for improving thermal load predictions and optimising turbine<br>design. This study introduces a combined approach of the<br>Harmonic Balance method, a differential Reynolds stress model,<br>and a localised film cooling model, which captures the dominant<br>unsteady effects in high-pressure turbine rotors. Traditional<br>steady-state RANS simulations often under- or over-predict adiabatic<br>wall temperatures and heat transfer coefficients due to the<br>neglect of unsteady interactions.<br>Results show that unsteady effects significantly impact thermal<br>loads, with frequency-domain harmonic balance simulations<br>closely matching high-fidelity time-domain URANS results at a<br>fraction of the computational expense. The localised film cooling<br>model improves accuracy over a coarser volume source model,<br>while the SSG/LRR-log(ω) turbulence model enhances turbulent<br>mixing predictions. This can enable a much better capturing of<br>relevant unsteady effects and turbulent mixing processes in both<br>problem analysis and design, the impact of which would remain<br>unknown using simpler methods.</p> |
| title | EFFICIENT UNSTEADY SIMULATIONS OF COOLED TURBINES USING HARMONIC BALANCE |
| topic | Turbomachinery Propulsion Heat Transfer |
| url | https://doi.org/10.5281/zenodo.20013857 |