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Journal Articles

A Low Mach Preconditioned Harmonic Balance Solver for Cavity Flutter Computations

Pierre Sivel, Christian Frey, Hans-Peter Kersken, Edmund Kügeler
Journal: Journal of Engineering for Gas Turbines and Power
Publisher: ASME
Article Type: Research-Article
J. Eng. Gas Turbines Power. February 2025, 147(2): 021029.
Paper No: GTP-24-1511
https://doi.org/10.1115/1.4066537
Published Online: October 26, 2024
View Article titled, A Low Mach Preconditioned Harmonic Balance Solver for Cavity Flutter Computations
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Topics: Cavities, Computation, Energy dissipation, Flutter (Aerodynamics), Mach number, Flow (Dynamics), Acoustics
Proceedings Papers

A Low Mach Preconditioned Harmonic Balance Solver for Cavity Flutter Computations

Pierre Sivel, Christian Frey, Hans-Peter Kersken, Edmund Kügeler
Proc. ASME. GT2024, Volume 10A: Structures and Dynamics — Aerodynamics Excitation and Damping; Bearing and Seal Dynamics; Emerging Methods in Engineering Design, Analysis, and Additive Manufacturing, V10AT21A012, June 24–28, 2024
Publisher: American Society of Mechanical Engineers
Paper No: GT2024-127337
https://doi.org/10.1115/GT2024-127337
View Paper titled, A Low Mach Preconditioned Harmonic Balance Solver for Cavity Flutter Computations
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Topics: Cavities, Computation, Flutter (Aerodynamics)
Proceedings Papers

Using Pseudotime Marching for the Solution of Harmonic Balance Problems

Christian Frey, Jan Backhaus, Graham Ashcroft, Georg Geiser, Benjamin Winhart, Heinrich Stüer
Proc. ASME. GT2024, Volume 12C: Turbomachinery — Design Methods and CFD Modeling for Turbomachinery; Ducts, Noise, and Component Interactions, V12CT32A038, June 24–28, 2024
Publisher: American Society of Mechanical Engineers
Paper No: GT2024-127820
https://doi.org/10.1115/GT2024-127820
View Paper titled, Using Pseudotime Marching for the Solution of Harmonic Balance Problems
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Topics: Aeroelasticity, Compressors, Computational fluid dynamics, Errors, Flow (Dynamics), Jacobian matrices, Linear systems, Oscillations, Robustness, Scalars
Journal Articles

Analyzing Unsteady Turbomachinery Flow Simulations With Mixing Entropy

Christian Frey, Benedict Geihe, Laura Junge
Journal: Journal of Turbomachinery
Publisher: ASME
Article Type: Research Papers
J. Turbomach. July 2024, 146(7): 071004.
Paper No: TURBO-23-1291
https://doi.org/10.1115/1.4064839
Published Online: March 18, 2024
View Article titled, Analyzing Unsteady Turbomachinery Flow Simulations With Mixing Entropy
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Topics: Blades, Entropy, Flow (Dynamics), Stators, Turbomachinery, Rotors, Acoustics, Simulation, Compressors
Journal Articles

Fully Coupled Analysis of Flutter Induced Limit Cycles: Frequency Versus Time Domain Methods

Christian Berthold, Johann Gross, Christian Frey, Malte Krack
Journal: Journal of Engineering for Gas Turbines and Power
Publisher: ASME
Article Type: Research-Article
J. Eng. Gas Turbines Power. July 2023, 145(7): 071009.
Paper No: GTP-22-1397
https://doi.org/10.1115/1.4062408
Published Online: May 25, 2023
View Article titled, Fully Coupled Analysis of Flutter Induced Limit Cycles: Frequency Versus Time Domain Methods
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Topics: Fluid structure interaction, Fluids, Flutter (Aerodynamics), Limit cycles, Vibration, Blades, Oscillations, Resonance
Journal Articles

Evaluating the Aerodynamic Damping At Shock Wave Boundary Layer Interacting Flow Conditions With Harmonic Balance

Jan Philipp Heners, Christian Frey, Björn Grüber, Thomas Carraro
Journal: Journal of Engineering for Gas Turbines and Power
Publisher: ASME
Article Type: Research-Article
J. Eng. Gas Turbines Power. March 2023, 145(3): 031012.
Paper No: GTP-22-1465
https://doi.org/10.1115/1.4055636
Published Online: December 5, 2022
View Article titled, Evaluating the Aerodynamic Damping At Shock Wave Boundary Layer Interacting Flow Conditions With Harmonic Balance
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Topics: Boundary layers, Damping, Flow (Dynamics), Flutter (Aerodynamics), Shock waves, Turbulence, Shock (Mechanics), Stators, Reynolds-averaged Navier–Stokes equations, Simulation
Journal Articles

Analysis of Turbomachinery Averaging Techniques

Christian Frey, Graham Ashcroft, Michael Müller, Jens Wellner
Journal: Journal of Turbomachinery
Publisher: ASME
Article Type: Research Papers
J. Turbomach. May 2023, 145(5): 051006.
Paper No: TURBO-22-1197
https://doi.org/10.1115/1.4056057
Published Online: November 25, 2022
View Article titled, Analysis of Turbomachinery Averaging Techniques
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Topics: Entropy, Flow (Dynamics), Pressure, Turbines, Turbomachinery, Computational fluid dynamics, Simulation
Proceedings Papers

Fully Coupled Analysis of Flutter Induced Limit Cycles: Frequency vs. Time Domain Methods

Christian Berthold, Johann Groß, Christian Frey, Malte Krack
Proc. ASME. GT2022, Volume 8A: Structures and Dynamics — Aerodynamics Excitation and Damping; Bearing and Seal Dynamics; Emerging Methods in Engineering Design, Analysis, and Additive Manufacturing; Fatigue, Fracture, and Life Prediction, V08AT21A001, June 13–17, 2022
Publisher: American Society of Mechanical Engineers
Paper No: GT2022-77999
https://doi.org/10.1115/GT2022-77999
View Paper titled, Fully Coupled Analysis of Flutter Induced Limit Cycles: Frequency vs. Time Domain Methods
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Topics: Flutter (Aerodynamics), Limit cycles, Fluid structure interaction, Oscillations, Blades, Friction, Vibration, Aircraft engines, Boundary-value problems, Damping
Proceedings Papers

Low Mach Preconditioning for Turbomachinery Flow Simulations With Cavities and Variable Gas Compositions

Pierre Sivel, Christian Frey, Edmund Kügeler, Markus Keil
Proc. ASME. GT2022, Volume 10C: Turbomachinery — Design Methods and CFD Modeling for Turbomachinery; Ducts, Noise, and Component Interactions, V10CT32A005, June 13–17, 2022
Publisher: American Society of Mechanical Engineers
Paper No: GT2022-79369
https://doi.org/10.1115/GT2022-79369
View Paper titled, Low Mach Preconditioning for Turbomachinery Flow Simulations With Cavities and Variable Gas Compositions
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Topics: Cavities, Flow simulation, Turbomachinery, Fluids, Computation, Exhaust systems, Gases, Computer simulation, Density, Inflow
Proceedings Papers

Analysis of Turbomachinery Averaging Techniques

Christian Frey, Graham Ashcroft, Michael Müller, Jens Wellner
Proc. ASME. GT2022, Volume 10C: Turbomachinery — Design Methods and CFD Modeling for Turbomachinery; Ducts, Noise, and Component Interactions, V10CT32A039, June 13–17, 2022
Publisher: American Society of Mechanical Engineers
Paper No: GT2022-82959
https://doi.org/10.1115/GT2022-82959
View Paper titled, Analysis of Turbomachinery Averaging Techniques
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Topics: Turbomachinery, Entropy, Turbines, Inflow, Acoustics, Engineering simulation, Film cooling, Simulation, Unsteady flow, Vorticity
Proceedings Papers

Evaluating the Aerodynamic Damping at Shock Wave Boundary Layer Interacting Flow Conditions With Harmonic Balance

Jan Philipp Heners, Thomas Carraro, Christian Frey, Björn Grüber
Proc. ASME. GT2022, Volume 8A: Structures and Dynamics — Aerodynamics Excitation and Damping; Bearing and Seal Dynamics; Emerging Methods in Engineering Design, Analysis, and Additive Manufacturing; Fatigue, Fracture, and Life Prediction, V08AT21A007, June 13–17, 2022
Publisher: American Society of Mechanical Engineers
Paper No: GT2022-81689
https://doi.org/10.1115/GT2022-81689
View Paper titled, Evaluating the Aerodynamic Damping at Shock Wave Boundary Layer Interacting Flow Conditions With Harmonic Balance
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Topics: Boundary layers, Damping, Flow (Dynamics), Shock waves, Reynolds-averaged Navier–Stokes equations, Shock (Mechanics), Annulus, Compressors, Flutter (Aerodynamics), High pressure (Physics)
Proceedings Papers

Efficient Forced Response Analysis for Asymmetric Vane Spacing

Benedict Geihe, Christian Frey, Graham Ashcroft
Proc. ASME. GT2022, Volume 8A: Structures and Dynamics — Aerodynamics Excitation and Damping; Bearing and Seal Dynamics; Emerging Methods in Engineering Design, Analysis, and Additive Manufacturing; Fatigue, Fracture, and Life Prediction, V08AT21A022, June 13–17, 2022
Publisher: American Society of Mechanical Engineers
Paper No: GT2022-82983
https://doi.org/10.1115/GT2022-82983
View Paper titled, Efficient Forced Response Analysis for Asymmetric Vane Spacing
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Topics: Blades, Engineering simulation, Engines, Excitation, Fluctuations (Physics), Fourier transforms, Inflow, Rotors, Simulation, Turbines
Journal Articles

A New Harmonic Balance Approach Using Multidimensional Time

Laura Junge, Christian Frey, Graham Ashcroft, Edmund Kügeler
Journal: Journal of Engineering for Gas Turbines and Power
Publisher: ASME
Article Type: Research-Article
J. Eng. Gas Turbines Power. August 2021, 143(8): 081007.
Paper No: GTP-20-1505
https://doi.org/10.1115/1.4049698
Published Online: March 31, 2021
View Article titled, A New Harmonic Balance Approach Using Multidimensional Time
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Topics: Blades, Flow (Dynamics), Fourier transforms, Pressure, Simulation, Wakes, Unsteady flow, Flutter (Aerodynamics), Inflow
Proceedings Papers

A New Harmonic Balance Approach Using Multidimensional Time

Laura Junge, Christian Frey, Graham Ashcroft, Edmund Kügeler
Proc. ASME. GT2020, Volume 10A: Structures and Dynamics, V10AT24A031, September 21–25, 2020
Publisher: American Society of Mechanical Engineers
Paper No: GT2020-16224
https://doi.org/10.1115/GT2020-16224
View Paper titled, A New Harmonic Balance Approach Using Multidimensional Time
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Topics: Aeroelasticity, Blades, Computer simulation, Engineering simulation, Errors, Excitation, Flow (Dynamics), Flutter (Aerodynamics), Fourier transforms, Inflow
Proceedings Papers

Analysis of Friction-Saturated Flutter Vibrations With a Fully-Coupled Frequency Domain Method

Christian Berthold, Johann Gross, Christian Frey, Malte Krack
Proc. ASME. GT2020, Volume 10A: Structures and Dynamics, V10AT24A032, September 21–25, 2020
Publisher: American Society of Mechanical Engineers
Paper No: GT2020-16253
https://doi.org/10.1115/GT2020-16253
View Paper titled, Analysis of Friction-Saturated Flutter Vibrations With a Fully-Coupled Frequency Domain Method
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Topics: Flutter (Aerodynamics), Friction, Vibration, Oscillations, Damping, Limit cycles, Aerodynamics, Algorithms, Boundary-value problems, Deflection
Proceedings Papers

On the Formulation of Nonreflecting Boundary Conditions for Turbomachinery Configurations: Part I — Theory and Implementation

Christian Frey, Daniel Schlüß, Nina Wolfrum, Patrick Bechlars, Maximilian Beck
Proc. ASME. GT2020, Volume 2C: Turbomachinery, V02CT35A019, September 21–25, 2020
Publisher: American Society of Mechanical Engineers
Paper No: GT2020-14684
https://doi.org/10.1115/GT2020-14684
View Paper titled, On the Formulation of Nonreflecting Boundary Conditions for Turbomachinery Configurations: Part I — Theory and Implementation
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Topics: Boundary-value problems, Simulation, Turbomachinery, Unsteady flow
Proceedings Papers

On the Formulation of Nonreflecting Boundary Conditions for Turbomachinery Configurations: Part II — Application and Analysis

Nina Wolfrum, Patrick Bechlars, Maximilian Beck, Christian Frey, Daniel Schlüß
Proc. ASME. GT2020, Volume 2C: Turbomachinery, V02CT35A037, September 21–25, 2020
Publisher: American Society of Mechanical Engineers
Paper No: GT2020-15358
https://doi.org/10.1115/GT2020-15358
View Paper titled, On the Formulation of Nonreflecting Boundary Conditions for Turbomachinery Configurations: Part II — Application and Analysis
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Topics: Boundary-value problems, Turbomachinery, Flow (Dynamics), Waves, Algorithms, Computational fluid dynamics, Acoustics, Blades, Computation, Design
Journal Articles

Analysis of Friction-Saturated Flutter Vibrations With a Fully Coupled Frequency Domain Method

Christian Berthold, Johann Gross, Christian Frey, Malte Krack
Journal: Journal of Engineering for Gas Turbines and Power
Publisher: ASME
Article Type: Research-Article
J. Eng. Gas Turbines Power. November 2020, 142(11): 111007.
Paper No: GTP-20-1508
https://doi.org/10.1115/1.4048650
Published Online: October 20, 2020
View Article titled, Analysis of Friction-Saturated Flutter Vibrations With a Fully Coupled Frequency Domain Method
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Topics: Aerodynamics, Damping, Deflection, Deformation, Flow (Dynamics), Fluid-dynamic forces, Flutter (Aerodynamics), Friction, Limit cycles, Shapes
Proceedings Papers

Aerodynamic Impact of Manufacturing Variation on a Nonaxisymmetric Multi-Passage Turbine Stage With Adjoint CFD

Alexander Liefke, Vincent Marciniak, Jan Backhaus, Christian Frey, Hanno Gottschalk, Uwe Janoske
Proc. ASME. GT2019, Volume 2D: Turbomachinery, V02DT46A017, June 17–21, 2019
Publisher: American Society of Mechanical Engineers
Paper No: GT2019-91480
https://doi.org/10.1115/GT2019-91480
View Paper titled, Aerodynamic Impact of Manufacturing Variation on a Nonaxisymmetric Multi-Passage Turbine Stage With Adjoint CFD
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Topics: Computational fluid dynamics, Manufacturing, Turbines, Blades, Computation, Design, High pressure (Physics), Simulation, Turbomachinery
Journal Articles

Investigation of the Impact of Unsteady Turbulence Effects on the Aeroelastic Analysis of a Low-Pressure Turbine Rotor Blade

Jan Philipp Heners, Damian M. Vogt, Christian Frey, Graham Ashcroft
Journal: Journal of Turbomachinery
Publisher: ASME
Article Type: Review Articles
J. Turbomach. October 2019, 141(10): 100801.
Paper No: TURBO-18-1307
https://doi.org/10.1115/1.4043950
Published Online: September 30, 2019
View Article titled, Investigation of the Impact of Unsteady Turbulence Effects on the Aeroelastic Analysis of a Low-Pressure Turbine Rotor Blade
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Topics: Blades, Filters, Pressure, Rotors, Simulation, Turbulence, Flow (Dynamics)