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Richard Sandberg
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Journal Articles

DATA-ASSIMILATION OF TRANSITIONAL AND SEPARATED TURBOMACHINERY FLOWS WITH PHYSICS-INFORMED NEURAL NETWORKS

Accepted Manuscript
Sean Hanrahan, Melissa Kozul, Richard Sandberg
Journal: Journal of Turbomachinery
Publisher: ASME
Article Type: Research Papers
J. Turbomach.
Paper No: TURBO-24-1059
https://doi.org/10.1115/1.4068396
Published Online: April 9, 2025
View Articletitled, DATA-ASSIMILATION OF TRANSITIONAL AND SEPARATED TURBOMACHINERY FLOWS WITH PHYSICS-INFORMED NEURAL NETWORKS
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Topics: Artificial neural networks, Flow (Dynamics), Physics, Turbochargers, Turbomachinery, Turbulence, Reynolds-averaged Navier–Stokes equations, Separation (Technology), Computational fluid dynamics, Pressure
Journal Articles

The Impact of Inflow Unsteadiness on Loss Prediction

Pawel J. Przytarski, Davide Lengani, Richard Sandberg
Journal: Journal of Turbomachinery
Publisher: ASME
Article Type: Research Papers
J. Turbomach. April 2025, 147(4): 041014.
Paper No: TURBO-24-1309
https://doi.org/10.1115/1.4067241
Published Online: December 17, 2024
View Articletitled, The Impact of Inflow Unsteadiness on Loss Prediction
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Topics: Compressors, Design, Gibbs' equation, Inflow, Pressure, Turbulence, Reynolds number, Flow (Dynamics), Blades, Simulation
Includes: Supplementary data
Proceedings Papers

The Impact of Inflow Unsteadiness on Loss Prediction

Pawel J. Przytarski, Davide Lengani, Richard Sandberg
Proc. ASME. GT2024, Volume 12D: Turbomachinery — Multidisciplinary Design Approaches, Optimization, and Uncertainty Quantification; Radial Turbomachinery Aerodynamics; Unsteady Flows in Turbomachinery, V12DT36A016, June 24–28, 2024
Publisher: American Society of Mechanical Engineers
Paper No: GT2024-127538
https://doi.org/10.1115/GT2024-127538
View Paper titled, The Impact of Inflow Unsteadiness on Loss Prediction
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Topics: Inflow, Pressure, Engineering simulation, Reynolds number, Simulation, Turbulence, Blades, Compressors, Design, Energy budget (Physics)
Proceedings Papers

Best-Practice Guidelines for High-Fidelity Simulations Based on Detailed Analysis of a Highly-Loaded Low-Pressure Turbine Cascade

Marco Rosenzweig, Simone Giaccherini, Lorenzo Pinelli, Melissa Kozul, Richard Sandberg, Michele Marconcini, Roberto Pacciani
Proc. ASME. GT2023, Volume 13B: Turbomachinery — Axial Flow Turbine Aerodynamics, V13BT30A021, June 26–30, 2023
Publisher: American Society of Mechanical Engineers
Paper No: GT2023-102697
https://doi.org/10.1115/GT2023-102697
View Paper titled, Best-Practice Guidelines for High-Fidelity Simulations Based on Detailed Analysis of a Highly-Loaded Low-Pressure Turbine Cascade
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Topics: Cascades (Fluid dynamics), Engineering simulation, Pressure, Simulation, Turbines, Blades, Flow (Dynamics), Large eddy simulation, Wakes, Boundary-value problems
Proceedings Papers

High-Fidelity Simulations and RANS Analysis of a Low-Pressure Turbine Cascade in a Spanwise-Diverging Gas Path - End-Wall Flow Analysis and Loss Generation Mechanisms

Marco Rosenzweig, Melissa Kozul, Richard Sandberg, Michele Marconcini, Roberto Pacciani
Proc. ASME. GT2023, Volume 13B: Turbomachinery — Axial Flow Turbine Aerodynamics, V13BT30A003, June 26–30, 2023
Publisher: American Society of Mechanical Engineers
Paper No: GT2023-101039
https://doi.org/10.1115/GT2023-101039
View Paper titled, High-Fidelity Simulations and RANS Analysis of a Low-Pressure Turbine Cascade in a Spanwise-Diverging Gas Path - End-Wall Flow Analysis and Loss Generation Mechanisms
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Topics: Cascades (Fluid dynamics), Engineering simulation, Flow (Dynamics), Pressure, Reynolds-averaged Navier–Stokes equations, Simulation, Turbines, Engines, Boundary layers, Computational fluid dynamics
Proceedings Papers

Study on the Applicability of a Machine-Learning Framework to Improve Modeling for the Stratification Phenomenon

Takuo Oda, Shimpei Okayasu, Nobuhide Hara, Koichi Tanimoto, Ali Haghiri, Xiaowei Xu, Richard Sandberg
Proc. ASME. ICONE29, Volume 8: Computational Fluid Dynamics (CFD) and Applications, V008T08A026, August 8–12, 2022
Publisher: American Society of Mechanical Engineers
Paper No: ICONE29-91829
https://doi.org/10.1115/ICONE29-91829
View Paper titled, Study on the Applicability of a Machine-Learning Framework to Improve Modeling for the Stratification Phenomenon
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Topics: Computer programming, Machine learning, Modeling, Thermal stratification, Turbulence
Proceedings Papers

Highly Resolved Large-Eddy Simulations of a Transonic Compressor Stage Midspan Section - Part II: Effect of Rotor-Stator Gap

Pawel J. Przytarski, John Leggett, Richard Sandberg, Christoph Bode
Proc. ASME. GT2022, Volume 10D: Turbomachinery — Multidisciplinary Design Approaches, Optimization, and Uncertainty Quantification; Turbomachinery General Interest; Unsteady Flows in Turbomachinery, V10DT37A019, June 13–17, 2022
Publisher: American Society of Mechanical Engineers
Paper No: GT2022-82474
https://doi.org/10.1115/GT2022-82474
View Paper titled, Highly Resolved Large-Eddy Simulations of a Transonic Compressor Stage Midspan Section - Part II: Effect of Rotor-Stator Gap
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Topics: Compressors, Large eddy simulation, Rotors, Stators, Flow (Dynamics), Blades, Engineering simulation, Simulation, Boundary layers, Design
Proceedings Papers

Exploring the Presence of Pressure Waves in Axial Compressor Cascades

John Leggett, Richard Sandberg
Proc. ASME. GT2020, Volume 2A: Turbomachinery, V02AT32A066, September 21–25, 2020
Publisher: American Society of Mechanical Engineers
Paper No: GT2020-16022
https://doi.org/10.1115/GT2020-16022
View Paper titled, Exploring the Presence of Pressure Waves in Axial Compressor Cascades
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Topics: Compressors, Pressure, Waves, Cascades (Fluid dynamics), Acoustics, Airfoils, Blades, Separation (Technology), Suction, Vibration
Proceedings Papers

Data-Driven Combustion Modeling for a Turbulent Flame Simulated With a Computationally Efficient Solver

Mohsen Talei, Man-Ching Ma, Richard Sandberg
Proc. ASME. GT2020, Volume 4A: Combustion, Fuels, and Emissions, V04AT04A046, September 21–25, 2020
Publisher: American Society of Mechanical Engineers
Paper No: GT2020-14843
https://doi.org/10.1115/GT2020-14843
View Paper titled, Data-Driven Combustion Modeling for a Turbulent Flame Simulated With a Computationally Efficient Solver
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Topics: Combustion, Flames, Modeling, Turbulence, Algebra, Density, Flow (Dynamics), Computer programming, Computer simulation, Large eddy simulation
Journal Articles

Loss Analysis of Unsteady Turbomachinery Flows Based on the Mechanical Work Potential

John Leggett, Edward Richardson, Stephan Priebe, Aamir Shabbir, Vittorio Michelassi, Richard Sandberg
Journal: Journal of Turbomachinery
Publisher: ASME
Article Type: Research Papers
J. Turbomach. November 2020, 142(11): 111009.
Paper No: TURBO-20-1041
https://doi.org/10.1115/1.4048162
Published Online: October 16, 2020
View Articletitled, Loss Analysis of Unsteady Turbomachinery Flows Based on the Mechanical Work Potential
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Topics: Blades, Compressors, Energy dissipation, Flow (Dynamics), Pressure, Simulation, Turbomachinery, Turbulence, Wakes, Reynolds-averaged Navier–Stokes equations
Journal Articles

Large-Eddy Simulation and RANS Analysis of the End-Wall Flow in a Linear Low-Pressure Turbine Cascade, Part I: Flow and Secondary Vorticity Fields Under Varying Inlet Condition

Richard Pichler, Yaomin Zhao, Richard Sandberg, Vittorio Michelassi, Roberto Pacciani, Michele Marconcini, Andrea Arnone
Journal: Journal of Turbomachinery
Publisher: ASME
Article Type: Research Papers
J. Turbomach. December 2019, 141(12): 121005.
Paper No: TURBO-19-1065
https://doi.org/10.1115/1.4045080
Published Online: November 8, 2019
View Articletitled, Large-Eddy Simulation and RANS Analysis of the End-Wall Flow in a Linear Low-Pressure Turbine Cascade, Part I: Flow and Secondary Vorticity Fields Under Varying Inlet Condition
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Topics: Boundary layers, Flow (Dynamics), Large eddy simulation, Pressure, Reynolds-averaged Navier–Stokes equations, Blades, Vortices, Turbines, Simulation, Cascades (Fluid dynamics)
Proceedings Papers

Loss Analysis of Unsteady Turbomachinery Flows Based on the Mechanical Work Potential

John Leggett, Edward Richardson, Stephan Priebe, Aamir Shabbir, Vittorio Michelassi, Richard Sandberg
Proc. ASME. GT2019, Volume 2A: Turbomachinery, V02AT45A021, June 17–21, 2019
Publisher: American Society of Mechanical Engineers
Paper No: GT2019-91253
https://doi.org/10.1115/GT2019-91253
View Paper titled, Loss Analysis of Unsteady Turbomachinery Flows Based on the Mechanical Work Potential
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Topics: Flow (Dynamics), Turbomachinery, Compressors, Cascades (Fluid dynamics), Pressure, Reynolds-averaged Navier–Stokes equations, Wakes, Blades, Energy dissipation, Engines
Journal Articles

Large Eddy Simulation and RANS Analysis of the End-Wall Flow in a Linear Low-Pressure-Turbine Cascade—Part II: Loss Generation

Michele Marconcini, Roberto Pacciani, Andrea Arnone, Vittorio Michelassi, Richard Pichler, Yaomin Zhao, Richard Sandberg
Journal: Journal of Turbomachinery
Publisher: ASME
Article Type: Research-Article
J. Turbomach. May 2019, 141(5): 051004.
Paper No: TURBO-18-1214
https://doi.org/10.1115/1.4042208
Published Online: January 21, 2019
View Articletitled, Large Eddy Simulation and RANS Analysis of the End-Wall Flow in a Linear Low-Pressure-Turbine Cascade—Part II: Loss Generation
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Topics: Blades, Flow (Dynamics), Large eddy simulation, Pressure, Reynolds-averaged Navier–Stokes equations, Turbines, Turbulence, Cascades (Fluid dynamics), Vortices, Vorticity
Proceedings Papers

LES and RANS Analysis of the End-Wall Flow in a Linear LPT Cascade With Variable Inlet Conditions: Part II — Loss Generation

Michele Marconcini, Roberto Pacciani, Andrea Arnone, Vittorio Michelassi, Richard Pichler, Yaomin Zhao, Richard Sandberg
Proc. ASME. GT2018, Volume 2B: Turbomachinery, V02BT41A024, June 11–15, 2018
Publisher: American Society of Mechanical Engineers
Paper No: GT2018-76450
https://doi.org/10.1115/GT2018-76450
View Paper titled, LES and RANS Analysis of the End-Wall Flow in a Linear LPT Cascade With Variable Inlet Conditions: Part II — Loss Generation
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Topics: Cascades (Fluid dynamics), Flow (Dynamics), Reynolds-averaged Navier–Stokes equations, Boundary layers, Design, Blades, Pressure, Turbines, Vortices, Computational fluid dynamics
Journal Articles

Loss Prediction in an Axial Compressor Cascade at Off-Design Incidences With Free Stream Disturbances Using Large Eddy Simulation

John Leggett, Stephan Priebe, Aamir Shabbir, Vittorio Michelassi, Richard Sandberg, Edward Richardson
Journal: Journal of Turbomachinery
Publisher: ASME
Article Type: Research-Article
J. Turbomach. July 2018, 140(7): 071005.
Paper No: TURBO-17-1228
https://doi.org/10.1115/1.4039807
Published Online: June 14, 2018
View Articletitled, Loss Prediction in an Axial Compressor Cascade at Off-Design Incidences With Free Stream Disturbances Using Large Eddy Simulation
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Topics: Blades, Boundary layers, Compressors, Design, Flow (Dynamics), Reynolds-averaged Navier–Stokes equations, Suction, Wakes, Turbulence, Pressure
Proceedings Papers

LES Loss Prediction in an Axial Compressor Cascade at Off-Design Incidences With Free Stream Disturbances

John Leggett, Stephan Priebe, Aamir Shabbir, Richard Sandberg, Edward Richardson, Vittorio Michelassi
Proc. ASME. GT2017, Volume 2A: Turbomachinery, V02AT39A031, June 26–30, 2017
Publisher: American Society of Mechanical Engineers
Paper No: GT2017-64292
https://doi.org/10.1115/GT2017-64292
View Paper titled, LES Loss Prediction in an Axial Compressor Cascade at Off-Design Incidences With Free Stream Disturbances
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Topics: Cascades (Fluid dynamics), Compressors, Design, Reynolds-averaged Navier–Stokes equations, Bubbles, Computer simulation, Eddies (Fluid dynamics), Large eddy simulation, Optimization, Separation (Technology)
Proceedings Papers

Detailed Investigation of RANS and LES Predictions of Loss Generation in an Axial Compressor Cascade at Off Design Incidences

John Leggett, Stephan Priebe, Richard Sandberg, Vittorio Michelassi, Aamir Shabbir
Proc. ASME. GT2016, Volume 2A: Turbomachinery, V02AT37A050, June 13–17, 2016
Publisher: American Society of Mechanical Engineers
Paper No: GT2016-57972
https://doi.org/10.1115/GT2016-57972
View Paper titled, Detailed Investigation of RANS and LES Predictions of Loss Generation in an Axial Compressor Cascade at Off Design Incidences
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Topics: Cascades (Fluid dynamics), Compressors, Design, Reynolds-averaged Navier–Stokes equations, Large eddy simulation, Engineering simulation, Jet engines, Simulation, Turbulence
Proceedings Papers

Highly Resolved LES of a Linear HPT Vane Cascade Using Structured and Unstructured Codes

Richard Pichler, James Kopriva, Gregory Laskowski, Vittorio Michelassi, Richard Sandberg
Proc. ASME. GT2016, Volume 2C: Turbomachinery, V02CT39A041, June 13–17, 2016
Publisher: American Society of Mechanical Engineers
Paper No: GT2016-57189
https://doi.org/10.1115/GT2016-57189
View Paper titled, Highly Resolved LES of a Linear HPT Vane Cascade Using Structured and Unstructured Codes
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Topics: Cascades (Fluid dynamics), Turbulence, Computer simulation, Large eddy simulation, Wakes, Blades, Boundary layers, Computer software, Computers, Design