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Journal Articles

Machine-Learnt Turbulence Closures for Low-Pressure Turbines With Unsteady Inflow Conditions

H. D. Akolekar, R. D. Sandberg, N. Hutchins, V. Michelassi, G. Laskowski
Journal: Journal of Turbomachinery
Publisher: ASME
Article Type: Research Papers
J. Turbomach. October 2019, 141(10): 101009.
Paper No: TURBO-18-1305
https://doi.org/10.1115/1.4043907
Published Online: September 30, 2019
View Article titled, Machine-Learnt Turbulence Closures for Low-Pressure Turbines With Unsteady Inflow Conditions
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Topics: Errors, Flow (Dynamics), Physics, Turbulence, Wakes, Inflow, Approximation, Locks (Waterways), Model development, Pressure
Journal Articles

Development and Use of Machine-Learnt Algebraic Reynolds Stress Models for Enhanced Prediction of Wake Mixing in Low-Pressure Turbines

H. D. Akolekar, J. Weatheritt, N. Hutchins, R. D. Sandberg, G. Laskowski, V. Michelassi
Journal: Journal of Turbomachinery
Publisher: ASME
Article Type: Research-Article
J. Turbomach. April 2019, 141(4): 041010.
Paper No: TURBO-18-1280
https://doi.org/10.1115/1.4041753
Published Online: March 7, 2019
View Article titled, Development and Use of Machine-Learnt Algebraic Reynolds Stress Models for Enhanced Prediction of Wake Mixing in Low-Pressure Turbines
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Topics: Flow (Dynamics), Pressure, Reynolds-averaged Navier–Stokes equations, Stress, Turbines, Wakes, Blades, Reynolds number, Turbulence, Algebra
Journal Articles

On the Identification and Decomposition of the Unsteady Losses in a Turbine Cascade

D. Lengani, D. Simoni, R. Pichler, R. D. Sandberg, V. Michelassi, F. Bertini
Journal: Journal of Turbomachinery
Publisher: ASME
Article Type: Research-Article
J. Turbomach. March 2019, 141(3): 031005.
Paper No: TURBO-18-1252
https://doi.org/10.1115/1.4042164
Published Online: January 16, 2019
View Article titled, On the Identification and Decomposition of the Unsteady Losses in a Turbine Cascade
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Topics: Blades, Boundary layers, Cascades (Fluid dynamics), Flow (Dynamics), Pressure, Suction, Turbines, Turbulence, Wakes, Dynamics (Mechanics)
Journal Articles

The Impact of Inlet Distortion and Reduced Frequency on the Performance of Centrifugal Compressors

A. Grimaldi, V. Michelassi
Journal: Journal of Engineering for Gas Turbines and Power
Publisher: ASME
Article Type: Research-Article
J. Eng. Gas Turbines Power. February 2019, 141(2): 021012.
Paper No: GTP-18-1401
https://doi.org/10.1115/1.4040907
Published Online: October 1, 2018
View Article titled, The Impact of Inlet Distortion and Reduced Frequency on the Performance of Centrifugal Compressors
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Topics: Compressors, Flow (Dynamics), Impellers, Design, Mach number, Blades, Inlet guide vanes
Journal Articles

Applying Machine Learnt Explicit Algebraic Stress and Scalar Flux Models to a Fundamental Trailing Edge Slot

R. D. Sandberg, R. Tan, J. Weatheritt, A. Ooi, A. Haghiri, V. Michelassi, G. Laskowski
Journal: Journal of Turbomachinery
Publisher: ASME
Article Type: Research-Article
J. Turbomach. October 2018, 140(10): 101008.
Paper No: TURBO-18-1202
https://doi.org/10.1115/1.4041268
Published Online: September 28, 2018
View Article titled, Applying Machine Learnt Explicit Algebraic Stress and Scalar Flux Models to a Fundamental Trailing Edge Slot
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Topics: Anisotropy, Heat flux, Large eddy simulation, Reynolds-averaged Navier–Stokes equations, Scalars, Stress, Tensors, Turbulence, Eddies (Fluid dynamics), Algebra
Journal Articles

Machine Learning in Gas Turbines

V. Michelassi, C. Allegorico, S. Cioncolini, A. Graziano, L. Tognarelli, M. Sepe
Journal: Mechanical Engineering
Publisher: ASME
Article Type: Select Article
Mechanical Engineering. September 2018, 140(09): S54–S55.
Paper No: ME-2018-SEP5
https://doi.org/10.1115/1.2018-SEP5
Published Online: September 1, 2018
View Article titled, Machine Learning in Gas Turbines
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Topics: Design, Gas turbines, Machine learning, Maintenance
Proceedings Papers

On the Identification and Decomposition of the Unsteady Losses in a Turbine Cascade

D. Lengani, D. Simoni, R. Pichler, R. Sandberg, V. Michelassi, F. Bertini
Proc. ASME. GT2018, Volume 2A: Turbomachinery, V02AT45A013, June 11–15, 2018
Publisher: American Society of Mechanical Engineers
Paper No: GT2018-75724
https://doi.org/10.1115/GT2018-75724
View Paper titled, On the Identification and Decomposition of the Unsteady Losses in a Turbine Cascade
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Topics: Cascades (Fluid dynamics), Turbines, Flow (Dynamics), Wakes, Blades, Suction, Boundary layers, Dynamics (Mechanics), Large eddy simulation, Optimization
Proceedings Papers

Applying Machine Learnt Explicit Algebraic Stress and Scalar Flux Models to a Fundamental Trailing Edge Slot

R. D. Sandberg, R. Tan, J. Weatheritt, A. Ooi, A. Haghiri, V. Michelassi, G. Laskowski
Proc. ASME. GT2018, Volume 5A: Heat Transfer, V05AT12A007, June 11–15, 2018
Publisher: American Society of Mechanical Engineers
Paper No: GT2018-75444
https://doi.org/10.1115/GT2018-75444
View Paper titled, Applying Machine Learnt Explicit Algebraic Stress and Scalar Flux Models to a Fundamental Trailing Edge Slot
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Topics: Algebra, Machinery, Scalars, Stress, Heat flux, Reynolds-averaged Navier–Stokes equations, Algorithms, Anisotropy, Diffusion (Physics), Geometry
Proceedings Papers

The Impact of Inlet Distortion and Reduced Frequency on the Performance of Centrifugal Compressors

A. Grimaldi, V. Michelassi
Proc. ASME. GT2018, Volume 2B: Turbomachinery, V02BT44A009, June 11–15, 2018
Publisher: American Society of Mechanical Engineers
Paper No: GT2018-75494
https://doi.org/10.1115/GT2018-75494
View Paper titled, The Impact of Inlet Distortion and Reduced Frequency on the Performance of Centrifugal Compressors
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Topics: Compressors, Flow (Dynamics), Design, Impellers, Liquefied natural gas, Aerodynamics, Blades, Databases, Theoretical analysis, Turbines
Proceedings Papers

LES and RANS Analysis of the End-Wall Flow in a Linear LPT Cascade: Part I — Flow and Secondary Vorticity Fields Under Varying Inlet Condition

R. Pichler, Yaomin Zhao, R. D. Sandberg, V. Michelassi, R. Pacciani, M. Marconcini, A. Arnone
Proc. ASME. GT2018, Volume 2B: Turbomachinery, V02BT41A020, June 11–15, 2018
Publisher: American Society of Mechanical Engineers
Paper No: GT2018-76233
https://doi.org/10.1115/GT2018-76233
View Paper titled, LES and RANS Analysis of the End-Wall Flow in a Linear LPT Cascade: Part I — Flow and Secondary Vorticity Fields Under Varying Inlet Condition
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Topics: Cascades (Fluid dynamics), Flow (Dynamics), Reynolds-averaged Navier–Stokes equations, Vorticity, Boundary layers, Blades, Design, Vortices, Computational fluid dynamics, Engineering simulation
Journal Articles

Highly Resolved Large Eddy Simulation Study of Gap Size Effect on Low-Pressure Turbine Stage

R. Pichler, V. Michelassi, R. Sandberg, J. Ong
Journal: Journal of Turbomachinery
Publisher: ASME
Article Type: Research-Article
J. Turbomach. February 2018, 140(2): 021003.
Paper No: TURBO-17-1123
https://doi.org/10.1115/1.4038178
Published Online: November 14, 2017
View Article titled, Highly Resolved Large Eddy Simulation Study of Gap Size Effect on Low-Pressure Turbine Stage
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Topics: Blades, Boundary layers, Pressure, Rotors, Stators, Turbines, Wakes, Suction, Flow (Dynamics), Large eddy simulation
Journal Articles

Accurate Estimation of Profile Losses and Analysis of Loss Generation Mechanisms in a Turbine Cascade

D. Lengani, D. Simoni, M. Ubaldi, P. Zunino, F. Bertini, V. Michelassi
Journal: Journal of Turbomachinery
Publisher: ASME
Article Type: Research-Article
J. Turbomach. December 2017, 139(12): 121007.
Paper No: TURBO-17-1106
https://doi.org/10.1115/1.4037858
Published Online: October 3, 2017
View Article titled, Accurate Estimation of Profile Losses and Analysis of Loss Generation Mechanisms in a Turbine Cascade
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Topics: Blades, Boundary layers, Cascades (Fluid dynamics), Flow (Dynamics), Suction, Wakes, Turbines, Turbulence, Pressure
Proceedings Papers

Accurate Estimation of Profile Losses and Analysis of Loss Generation Mechanisms in a Turbine Cascade

D. Lengani, D. Simoni, M. Ubaldi, P. Zunino, F. Bertini, V. Michelassi
Proc. ASME. GT2017, Volume 2A: Turbomachinery, V02AT40A021, June 26–30, 2017
Publisher: American Society of Mechanical Engineers
Paper No: GT2017-64244
https://doi.org/10.1115/GT2017-64244
View Paper titled, Accurate Estimation of Profile Losses and Analysis of Loss Generation Mechanisms in a Turbine Cascade
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Topics: Cascades (Fluid dynamics), Turbines, Wakes, Flow (Dynamics), Pressure, Boundary layers, Probes, Suction, Blades, Dynamics (Mechanics)
Proceedings Papers

Highly Resolved LES Study of Gap Size Effect on Low-Pressure Turbine Stage

R. Pichler, V. Michelassi, R. Sandberg, J. Ong
Proc. ASME. GT2017, Volume 2A: Turbomachinery, V02AT40A006, June 26–30, 2017
Publisher: American Society of Mechanical Engineers
Paper No: GT2017-63407
https://doi.org/10.1115/GT2017-63407
View Paper titled, Highly Resolved LES Study of Gap Size Effect on Low-Pressure Turbine Stage
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Topics: Pressure, Size effect, Turbines, Blades, Wakes, Rotors, Stators, Kinetic energy, Separation (Technology), Suction
Proceedings Papers

Assessment of Grid Resolution Requirements for Accurate Simulation of Disparate Scales of Turbulent Flow in Low-Pressure Turbines

R. Pichler, R. D. Sandberg, V. Michelassi
Proc. ASME. GT2016, Volume 2C: Turbomachinery, V02CT39A030, June 13–17, 2016
Publisher: American Society of Mechanical Engineers
Paper No: GT2016-56858
https://doi.org/10.1115/GT2016-56858
View Paper titled, Assessment of Grid Resolution Requirements for Accurate Simulation of Disparate Scales of Turbulent Flow in Low-Pressure Turbines
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Topics: Pressure, Resolution (Optics), Simulation, Turbines, Turbulence, Kinetic energy, Blades, Wakes, Cascades (Fluid dynamics), Computer simulation
Journal Articles

Investigation of the Accuracy of RANS Models to Predict the Flow Through a Low-Pressure Turbine

R. Pichler, R. D. Sandberg, V. Michelassi, R. Bhaskaran
Journal: Journal of Turbomachinery
Publisher: ASME
Article Type: Research-Article
J. Turbomach. December 2016, 138(12): 121009.
Paper No: TURBO-16-1076
https://doi.org/10.1115/1.4033507
Published Online: June 22, 2016
View Article titled, Investigation of the Accuracy of RANS Models to Predict the Flow Through a Low-Pressure Turbine
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Topics: Flow (Dynamics), Pressure, Reynolds-averaged Navier–Stokes equations, Turbines, Turbulence, Modeling, Errors, Fluctuations (Physics), Computational fluid dynamics, Computer simulation
Journal Articles

High-Fidelity Simulations of Low-Pressure Turbines: Effect of Flow Coefficient and Reduced Frequency on Losses

V. Michelassi, L. Chen, R. Pichler, R. Sandberg, R. Bhaskaran
Journal: Journal of Turbomachinery
Publisher: ASME
Article Type: Research-Article
J. Turbomach. November 2016, 138(11): 111006.
Paper No: TURBO-16-1041
https://doi.org/10.1115/1.4033266
Published Online: May 17, 2016
View Article titled, High-Fidelity Simulations of Low-Pressure Turbines: Effect of Flow Coefficient and Reduced Frequency on Losses
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Topics: Blades, Boundary layers, Flow (Dynamics), Pressure, Simulation, Wakes, Turbines, Design, Turbulence, Locks (Waterways)
Proceedings Papers

High-Fidelity Simulations of Low-Pressure Turbines: Effect of Flow Coefficient and Reduced Frequency on Losses

V. Michelassi, L. Chen, R. Pichler, R. Sandberg, R. Bhaskaran
Proc. ASME. GT2015, Volume 2C: Turbomachinery, V02CT44A024, June 15–19, 2015
Publisher: American Society of Mechanical Engineers
Paper No: GT2015-43429
https://doi.org/10.1115/GT2015-43429
View Paper titled, High-Fidelity Simulations of Low-Pressure Turbines: Effect of Flow Coefficient and Reduced Frequency on Losses
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Topics: Engineering simulation, Flow (Dynamics), Pressure, Simulation, Turbines, Wakes, Boundary layers, Computer simulation, Blades, Large eddy simulation
Proceedings Papers

Investigation of the Accuracy of RANS Models to Predict the Flow Through a Low-Pressure Turbine

R. Pichler, R. D. Sandberg, V. Michelassi, R. Bhaskaran
Proc. ASME. GT2015, Volume 2B: Turbomachinery, V02BT39A036, June 15–19, 2015
Publisher: American Society of Mechanical Engineers
Paper No: GT2015-43446
https://doi.org/10.1115/GT2015-43446
View Paper titled, Investigation of the Accuracy of RANS Models to Predict the Flow Through a Low-Pressure Turbine
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Topics: Flow (Dynamics), Pressure, Reynolds-averaged Navier–Stokes equations, Turbines, Turbulence, Modeling, Errors, Fluctuations (Physics), Computer simulation, Kinetic energy
Proceedings Papers

Aerodynamic Performance of a Transonic Turbine Guide Vane With Trailing Edge Coolant Ejection: Part II — Numerical Approach

V. Michelassi, F. Martelli, J. Amecke
Proc. ASME. GT1994, Volume 1: Turbomachinery, V001T01A089, June 13–16, 1994
Publisher: American Society of Mechanical Engineers
Paper No: 94-GT-248
https://doi.org/10.1115/94-GT-248
View Paper titled, Aerodynamic Performance of a Transonic Turbine Guide Vane With Trailing Edge Coolant Ejection: Part II — Numerical Approach
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Topics: Coolants, Guide vanes, Turbines, Blades, Mach number, Wakes, Algorithms, Computer simulation, Flow (Dynamics), Shapes