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Journal Articles

Using Pseudotime Marching for the Solution of Harmonic Balance Problems

Accepted Manuscript
Christian Frey, Jan Backhaus, Graham Ashcroft, Georg Geiser, Benjamin Winhart, Heinrich Stueer
Journal: Journal of Turbomachinery
Publisher: ASME
Article Type: Research Papers
J. Turbomach.
Paper No: TURBO-24-1275
https://doi.org/10.1115/1.4067519
Published Online: December 24, 2024
View Article titled, Using Pseudotime Marching for the Solution of Harmonic Balance Problems
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Topics: Compressors, Computational fluid dynamics, Design, Errors, Flow (Dynamics), Linear systems, Robustness, Scalars, Turbochargers
Proceedings Papers

On the Development of an Efficient Sliding Mesh Interface for the Harmonic Balance Method, Part II: Effects of Casing Treatments on the Aerodynamic Damping of a Compressor Blade

Maximilian Hartmann, Daniel Schlüß, Georg Geiser, Felix Schwarzenthal, Graham Ashcroft, Florian Herbst
Proc. ASME. GT2024, Volume 12C: Turbomachinery — Design Methods and CFD Modeling for Turbomachinery; Ducts, Noise, and Component Interactions, V12CT32A033, June 24–28, 2024
Publisher: American Society of Mechanical Engineers
Paper No: GT2024-127237
https://doi.org/10.1115/GT2024-127237
View Paper titled, On the Development of an Efficient Sliding Mesh Interface for the Harmonic Balance Method, Part II: Effects of Casing Treatments on the Aerodynamic Damping of a Compressor Blade
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Topics: Blades, Compressors, Damping, Flutter (Aerodynamics)
Proceedings Papers

On the Development of an Efficient Sliding Mesh Interface for the Harmonic Balance Method, Part I: Implementation and Verification

Georg Geiser, Felix Schwarzenthal, Graham Ashcroft, Maximilian Hartmann, Daniel Schlüß
Proc. ASME. GT2024, Volume 12C: Turbomachinery — Design Methods and CFD Modeling for Turbomachinery; Ducts, Noise, and Component Interactions, V12CT32A021, June 24–28, 2024
Publisher: American Society of Mechanical Engineers
Paper No: GT2024-125015
https://doi.org/10.1115/GT2024-125015
View Paper titled, On the Development of an Efficient Sliding Mesh Interface for the Harmonic Balance Method, Part I: Implementation and Verification
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Topics: Algorithms, Ansätze (Mathematics), Blades, Cavities, Compressors, Design, Ducts, Entropy, Excitation, Flow (Dynamics)
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

A Numerical Test Rig for Turbomachinery Flows Based on Large Eddy Simulations With a High-Order Discontinuous Galerkin Scheme—Part I: Sliding Interfaces and Unsteady Row Interactions

Michael Bergmann, Christian Morsbach, Bjoern F. Klose, Graham Ashcroft, Edmund Kügeler
Journal: Journal of Turbomachinery
Publisher: ASME
Article Type: Research Papers
J. Turbomach. February 2024, 146(2): 021005.
Paper No: TURBO-23-1166
https://doi.org/10.1115/1.4063734
Published Online: November 13, 2023
View Article titled, A Numerical Test Rig for Turbomachinery Flows Based on Large Eddy Simulations With a High-Order Discontinuous Galerkin Scheme—Part I: Sliding Interfaces and Unsteady Row Interactions
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Topics: Cascades (Fluid dynamics), Flow (Dynamics), Mortar, Pressure, Simulation, Turbulence, Vortices, Large eddy simulation, Wakes, Computational fluid dynamics
Proceedings Papers

A Numerical Test Rig for Turbomachinery Flows Based on Large Eddy Simulations With a High-Order Discontinuous Galerkin Scheme - Part 1: Sliding Interfaces and Unsteady Row Interactions

Michael Bergmann, Christian Morsbach, Björn F. Klose, Graham Ashcroft, Edmund Kügeler
Proc. ASME. GT2023, Volume 13D: Turbomachinery — Multidisciplinary Design Approaches, Optimization, and Uncertainty Quantification; Radial Turbomachinery Aerodynamics; Unsteady Flows in Turbomachinery, V13DT36A005, June 26–30, 2023
Publisher: American Society of Mechanical Engineers
Paper No: GT2023-101623
https://doi.org/10.1115/GT2023-101623
View Paper titled, A Numerical Test Rig for Turbomachinery Flows Based on Large Eddy Simulations With a High-Order Discontinuous Galerkin Scheme - Part 1: Sliding Interfaces and Unsteady Row Interactions
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Topics: Flow (Dynamics), Large eddy simulation, Turbomachinery, Wakes, Cascades (Fluid dynamics), Computer simulation, Engineering simulation, Simulation, Computational fluid dynamics, Convection
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

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

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

Statistical Error Estimation Methods for Engineering-Relevant Quantities From Scale-Resolving Simulations

Michael Bergmann, Christian Morsbach, Graham Ashcroft, Edmund Kügeler
Journal: Journal of Turbomachinery
Publisher: ASME
Article Type: Research Papers
J. Turbomach. March 2022, 144(3): 031005.
Paper No: TURBO-21-1038
https://doi.org/10.1115/1.4052402
Published Online: October 1, 2021
View Article titled, Statistical Error Estimation Methods for Engineering-Relevant Quantities From Scale-Resolving Simulations
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Topics: Blades, Errors, Pressure, Signals, Simulation, Transients (Dynamics), Flow (Dynamics), Turbulence, Wakes
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
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)
Proceedings Papers

Comparison of Linear and Nonlinear Frequency Domain Methods for Flutter Analysis

Hans-Peter Kersken, Graham Ashcroft, Christian Frey, Nina Wolfrum, Oliver Pütz
Proc. ASME. GT2018, Volume 2C: Turbomachinery, V02CT42A016, June 11–15, 2018
Publisher: American Society of Mechanical Engineers
Paper No: GT2018-75626
https://doi.org/10.1115/GT2018-75626
View Paper titled, Comparison of Linear and Nonlinear Frequency Domain Methods for Flutter Analysis
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Topics: Flutter (Aerodynamics), Blades, Turbomachinery, Algorithms, Gas turbines, Jet engines, Pressure, Stability, Turbines
Proceedings Papers

On the Simulation of Unsteady Turbulence and Transition Effects in a Multistage Low Pressure Turbine: Part I — Verification and Validation

Graham Ashcroft, Christian Frey, Hans-Peter Kersken, Edmund Kügeler, Nina Wolfrum
Proc. ASME. GT2018, Volume 2C: Turbomachinery, V02CT42A042, June 11–15, 2018
Publisher: American Society of Mechanical Engineers
Paper No: GT2018-76756
https://doi.org/10.1115/GT2018-76756
View Paper titled, On the Simulation of Unsteady Turbulence and Transition Effects in a Multistage Low Pressure Turbine: Part I — Verification and Validation
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Topics: Pressure, Simulation, Turbine components, Turbulence, Boundary-value problems, Turbines, Airfoils, Computational fluid dynamics, Flow (Dynamics), Unsteady flow
Proceedings Papers

On the Development of Harmonic Balance Methods for Multiple Fundamental Frequencies

Laura Junge, Graham Ashcroft, Hans-Peter Kersken, Christian Frey
Proc. ASME. GT2018, Volume 2C: Turbomachinery, V02CT42A012, June 11–15, 2018
Publisher: American Society of Mechanical Engineers
Paper No: GT2018-75495
https://doi.org/10.1115/GT2018-75495
View Paper titled, On the Development of Harmonic Balance Methods for Multiple Fundamental Frequencies
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Topics: Aerodynamic flow, Blades, Computer simulation, Flow (Dynamics), Fourier transforms, Modeling, Signals, Turbomachinery, Unsteady flow
Proceedings Papers

On the Application of a Harmonic Balance Method With a Volume Source Cooling Model to the Simulation of a Film-Cooled Turbine Stage

Kai Becker, Graham Ashcroft, Anton Weber, Stefan Rochhausen, Jose Rodriguez, Gregor Schmid
Proc. ASME. GT2016, Volume 2D: Turbomachinery, V02DT44A022, June 13–17, 2016
Publisher: American Society of Mechanical Engineers
Paper No: GT2016-57199
https://doi.org/10.1115/GT2016-57199
View Paper titled, On the Application of a Harmonic Balance Method With a Volume Source Cooling Model to the Simulation of a Film-Cooled Turbine Stage
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Topics: Cooling, Simulation, Turbines, Flow (Dynamics), Unsteady flow, Blades, Computer simulation, Errors, Heat transfer, High pressure (Physics)
Proceedings Papers

On the Extension of a Harmonic Balance Method for the Simulation of Compressor Casing Treatments

Christian Voigt, Graham Ashcroft
Proc. ASME. GT2016, Volume 2C: Turbomachinery, V02CT39A035, June 13–17, 2016
Publisher: American Society of Mechanical Engineers
Paper No: GT2016-56990
https://doi.org/10.1115/GT2016-56990
View Paper titled, On the Extension of a Harmonic Balance Method for the Simulation of Compressor Casing Treatments
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Topics: Compressors, Simulation, Flow (Dynamics), Algorithms, Blades, Ducts, Entropy, Interpolation, Numerical analysis, Particulate matter
Proceedings Papers

Time-Domain Implementation of Higher-Order Non-Reflecting Boundary Conditions for Turbomachinery Applications

Stefan Henninger, Peter Jeschke, Graham Ashcroft, Edmund Kügeler
Proc. ASME. GT2015, Volume 2B: Turbomachinery, V02BT39A016, June 15–19, 2015
Publisher: American Society of Mechanical Engineers
Paper No: GT2015-42362
https://doi.org/10.1115/GT2015-42362
View Paper titled, Time-Domain Implementation of Higher-Order Non-Reflecting Boundary Conditions for Turbomachinery Applications
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Topics: Boundary-value problems, Turbomachinery, Blades, Acoustics, Flutter (Aerodynamics), Laplace transforms, Reflection, Approximation, Bessel functions, Contamination
Proceedings Papers

Simulations of Unsteady Blade Row Interactions Using Linear and Non-Linear Frequency Domain Methods

Christian Frey, Graham Ashcroft, Hans-Peter Kersken
Proc. ASME. GT2015, Volume 2B: Turbomachinery, V02BT39A037, June 15–19, 2015
Publisher: American Society of Mechanical Engineers
Paper No: GT2015-43453
https://doi.org/10.1115/GT2015-43453
View Paper titled, Simulations of Unsteady Blade Row Interactions Using Linear and Non-Linear Frequency Domain Methods
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Topics: Blades, Simulation, Turbomachinery, Flow (Dynamics), Unsteady flow, Acoustics, Computational fluid dynamics, Rotors, Stators, Wheels