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Melissa Kozul
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Journal Articles

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

Open Access
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
Open the PDF for DATA-ASSIMILATION OF TRANSITIONAL AND SEPARATED TURBOMACHINERY FLOWS WITH PHYSICS-INFORMED NEURAL NETWORKS in another window
Topics: Artificial neural networks, Flow (Dynamics), Physics, Turbochargers, Turbomachinery, Turbulence, Reynolds-averaged Navier–Stokes equations, Separation (Technology), Computational fluid dynamics, Pressure
Journal Articles

Optimal Riblets Applied to Gas Turbine Compressor Blades Studied via Direct Numerical Simulation (GT2024–122305)

Open Access
Melissa Kozul, Massimiliano Nardini, Pawel J. Przytarski, William Solomon, Aamir Shabbir, Richard D. Sandberg
Journal: Journal of Turbomachinery
Publisher: ASME
Article Type: Research Papers
J. Turbomach. August 2025, 147(8): 081020.
Paper No: TURBO-24-1298
https://doi.org/10.1115/1.4067442
Published Online: January 30, 2025
View Articletitled, Optimal Riblets Applied to Gas Turbine Compressor Blades Studied via Direct Numerical Simulation (GT2024–122305)
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Topics: Blades, Boundary layers, Chords (Trusses), Compressors, Flow (Dynamics), Gas turbines, Geometry, Inflow, Pressure, Skin friction (Fluid dynamics)
Journal Articles

Unsteady Loss Mechanisms in Low-Pressure Turbines With Diverging End-Walls Studied Via High-Fidelity Simulation

Open Access
Marco Rosenzweig, Melissa Kozul, Richard D. Sandberg
Journal: Journal of Turbomachinery
Publisher: ASME
Article Type: Research Papers
J. Turbomach. April 2025, 147(4): 041018.
Paper No: TURBO-24-1296
https://doi.org/10.1115/1.4067294
Published Online: December 20, 2024
View Articletitled, Unsteady Loss Mechanisms in Low-Pressure Turbines With Diverging End-Walls Studied Via High-Fidelity Simulation
Open the PDF for Unsteady Loss Mechanisms in Low-Pressure Turbines With Diverging End-Walls Studied Via High-Fidelity Simulation in another window
Topics: Blades, Flow (Dynamics), Pressure, Simulation, Wakes, Turbulence, Separation (Technology), Boundary layers, Bubbles
Journal Articles

Performance of Rough-Ribbed Low-Pressure Turbine Blades Under Varying Loading and Operating Conditions

Open Access
S. M. Ananth, Massimiliano Nardini, Melissa Kozul, Nagabhushana Rao Vadlamani, Richard D. Sandberg
Journal: Journal of Turbomachinery
Publisher: ASME
Article Type: Research Papers
J. Turbomach. April 2025, 147(4): 041011.
Paper No: TURBO-24-1255
https://doi.org/10.1115/1.4066815
Published Online: October 25, 2024
View Articletitled, Performance of Rough-Ribbed Low-Pressure Turbine Blades Under Varying Loading and Operating Conditions
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Topics: Boundary layers, Flow (Dynamics), Reynolds number, Skin friction (Fluid dynamics), Surface roughness, Turbulence, Pressure, Simulation, Blades, Statistics
Proceedings Papers

Optimal Riblets Applied to Gas Turbine Compressor Blades Studied via Direct Numerical Simulation

Available to Purchase

Melissa Kozul, Massimiliano Nardini, Pawel J. Przytarski, William Solomon, Aamir Shabbir, Richard D. Sandberg
Proc. ASME. GT2024, Volume 12A: Turbomachinery — Axial Flow Fan and Compressor Aerodynamics, V12AT29A007, June 24–28, 2024
Publisher: American Society of Mechanical Engineers
Paper No: GT2024-122305
https://doi.org/10.1115/GT2024-122305
View Paper titled, Optimal Riblets Applied to Gas Turbine Compressor Blades Studied via Direct Numerical Simulation
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Topics: Blades, Compressors, Computer simulation, Gas turbines
Proceedings Papers

Performance of Rough-Ribbed Low-Pressure Turbine Blades Under Varying Loading and Operating Conditions

Available to Purchase

Ananth S. M., Massimiliano Nardini, Melissa Kozul, Nagabhushana Rao Vadlamani, Richard D. Sandberg
Proc. ASME. GT2024, Volume 12B: Turbomachinery — Axial Flow Turbine Aerodynamics; Deposition, Erosion, Fouling, and Icing, V12BT30A039, June 24–28, 2024
Publisher: American Society of Mechanical Engineers
Paper No: GT2024-127998
https://doi.org/10.1115/GT2024-127998
View Paper titled, Performance of Rough-Ribbed Low-Pressure Turbine Blades Under Varying Loading and Operating Conditions
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Topics: Pressure, Surface roughness, Turbine blades, Design, Skin friction (Fluid dynamics), Blades, Boundary layers, Flow (Dynamics), Turbulence, Bubbles
Proceedings Papers

DNS of Turbine Vanes Subjected to Inlet Temperature Variations and Robust Quantification of Aerothermal Flow Irreversibilities

Available to Purchase

Massimiliano Nardini, Melissa Kozul, Richard D. Sandberg
Proc. ASME. GT2024, Volume 12C: Turbomachinery — Design Methods and CFD Modeling for Turbomachinery; Ducts, Noise, and Component Interactions, V12CT32A030, June 24–28, 2024
Publisher: American Society of Mechanical Engineers
Paper No: GT2024-126865
https://doi.org/10.1115/GT2024-126865
View Paper titled, DNS of Turbine Vanes Subjected to Inlet Temperature Variations and Robust Quantification of Aerothermal Flow Irreversibilities
Open the PDF for DNS of Turbine Vanes Subjected to Inlet Temperature Variations and Robust Quantification of Aerothermal Flow Irreversibilities in another window
Topics: Computer simulation, Entropy, Flow (Dynamics), High pressure (Physics), Temperature, Turbines, Turbulence
Proceedings Papers

Unsteady Loss Mechanisms in Low-Pressure Turbines With Diverging End-Walls Studied via High-Fidelity Simulation

Available to Purchase

Marco Rosenzweig, Melissa Kozul, Richard D. Sandberg
Proc. ASME. GT2024, Volume 12D: Turbomachinery — Multidisciplinary Design Approaches, Optimization, and Uncertainty Quantification; Radial Turbomachinery Aerodynamics; Unsteady Flows in Turbomachinery, V12DT36A010, June 24–28, 2024
Publisher: American Society of Mechanical Engineers
Paper No: GT2024-125408
https://doi.org/10.1115/GT2024-125408
View Paper titled, Unsteady Loss Mechanisms in Low-Pressure Turbines With Diverging End-Walls Studied via High-Fidelity Simulation
Open the PDF for Unsteady Loss Mechanisms in Low-Pressure Turbines With Diverging End-Walls Studied via High-Fidelity Simulation in another window
Topics: Pressure, Simulation, Turbines, Wakes, Blades, Flow (Dynamics), Boundary layers, Engines, Cascades (Fluid dynamics), Mach number
Journal Articles

Effects of Riblet Dimensions on the Transitional Boundary Layers Over High-Lift Turbine Blades

Available to Purchase
S. M. Ananth, Massimiliano Nardini, Aditya Vaid, Melissa Kozul, Nagabhushana Rao Vadlamani, Richard D. Sandberg
Journal: Journal of Turbomachinery
Publisher: ASME
Article Type: Research Papers
J. Turbomach. March 2024, 146(3): 031012.
Paper No: TURBO-23-1250
https://doi.org/10.1115/1.4064087
Published Online: December 14, 2023
View Articletitled, Effects of Riblet Dimensions on the Transitional Boundary Layers Over High-Lift Turbine Blades
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Topics: Blades, Boundary layers, Dimensions, Flow (Dynamics), Surface roughness, Turbulence, Turbine blades, Skin friction (Fluid dynamics), Simulation, Pressure gradient
Journal Articles

Direct Numerical Simulation of Transitional and Turbulent Flows Over Multi-Scale Surface Roughness—Part II: The Effect of Roughness on the Performance of a High-Pressure Turbine Blade

Free
Massimiliano Nardini, Thomas O. Jelly, Melissa Kozul, Richard D. Sandberg, Paul Vitt, Greg Sluyter
Journal: Journal of Turbomachinery
Publisher: ASME
Article Type: Research Papers
J. Turbomach. March 2024, 146(3): 031009.
Paper No: TURBO-23-1225
https://doi.org/10.1115/1.4063974
Published Online: December 4, 2023
View Articletitled, Direct Numerical Simulation of Transitional and Turbulent Flows Over Multi-Scale Surface Roughness—Part II: The Effect of Roughness on the Performance of a High-Pressure Turbine Blade
Open the PDF for Direct Numerical Simulation of Transitional and Turbulent Flows Over Multi-Scale Surface Roughness—Part II: The Effect of Roughness on the Performance of a High-Pressure Turbine Blade in another window
Topics: Blades, Boundary layers, Surface roughness, Turbulence, Computer simulation, Turbine blades, High pressure (Physics), Flow (Dynamics), Heat flux, Wakes
Journal Articles

Direct Numerical Simulation of Transitional and Turbulent Flows Over Multi-Scale Surface Roughness—Part I: Methodology and Challenges

Free
Massimiliano Nardini, Melissa Kozul, Thomas O. Jelly, Richard D. Sandberg
Journal: Journal of Turbomachinery
Publisher: ASME
Article Type: Research Papers
J. Turbomach. March 2024, 146(3): 031008.
Paper No: TURBO-23-1172
https://doi.org/10.1115/1.4063753
Published Online: December 4, 2023
View Articletitled, Direct Numerical Simulation of Transitional and Turbulent Flows Over Multi-Scale Surface Roughness—Part I: Methodology and Challenges
Open the PDF for Direct Numerical Simulation of Transitional and Turbulent Flows Over Multi-Scale Surface Roughness—Part I: Methodology and Challenges in another window
Topics: Blades, Flow (Dynamics), Surface roughness, Turbulence, Computer simulation
Proceedings Papers

Direct Numerical Simulation of Riblets Applied to Gas Turbine Compressor Blades at On- and Off-Design Incidences

Available to Purchase

Melissa Kozul, Massimiliano Nardini, Pawel J. Przytarski, William Solomon, Aamir Shabbir, Richard D. Sandberg
Proc. ASME. GT2023, Volume 13A: Turbomachinery — Axial Flow Fan and Compressor Aerodynamics, V13AT29A006, June 26–30, 2023
Publisher: American Society of Mechanical Engineers
Paper No: GT2023-101038
https://doi.org/10.1115/GT2023-101038
View Paper titled, Direct Numerical Simulation of Riblets Applied to Gas Turbine Compressor Blades at On- and Off-Design Incidences
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Topics: Blades, Compressors, Computer simulation, Design, Gas turbines
Proceedings Papers

Direct Numerical Simulation of Transitional and Turbulent Flows Over Multi-Scale Surface Roughness - Part I: Methodology and Challenges

Available to Purchase

Massimiliano Nardini, Melissa Kozul, Tomas O. Jelly, Richard D. Sandberg
Proc. ASME. GT2023, Volume 13B: Turbomachinery — Axial Flow Turbine Aerodynamics, V13BT30A030, June 26–30, 2023
Publisher: American Society of Mechanical Engineers
Paper No: GT2023-103355
https://doi.org/10.1115/GT2023-103355
View Paper titled, Direct Numerical Simulation of Transitional and Turbulent Flows Over Multi-Scale Surface Roughness - Part I: Methodology and Challenges
Open the PDF for Direct Numerical Simulation of Transitional and Turbulent Flows Over Multi-Scale Surface Roughness - Part I: Methodology and Challenges in another window
Topics: Channel flow, Computer simulation, High pressure (Physics), Surface roughness, Turbines, Turbulence
Proceedings Papers

Direct Numerical Simulation of Transitional and Turbulent Flows Over Multi-Scale Surface Roughness - Part II: The Effect of Roughness on the Performance of a High-Pressure Turbine Blade

Available to Purchase

Massimiliano Nardini, Thomas O. Jelly, Melissa Kozul, Richard D. Sandberg, Paul Vitt, Greg Sluyter
Proc. ASME. GT2023, Volume 13B: Turbomachinery — Axial Flow Turbine Aerodynamics, V13BT30A020, June 26–30, 2023
Publisher: American Society of Mechanical Engineers
Paper No: GT2023-102671
https://doi.org/10.1115/GT2023-102671
View Paper titled, Direct Numerical Simulation of Transitional and Turbulent Flows Over Multi-Scale Surface Roughness - Part II: The Effect of Roughness on the Performance of a High-Pressure Turbine Blade
Open the PDF for Direct Numerical Simulation of Transitional and Turbulent Flows Over Multi-Scale Surface Roughness - Part II: The Effect of Roughness on the Performance of a High-Pressure Turbine Blade in another window
Topics: Computer simulation, High pressure (Physics), Surface roughness, Turbine blades, Turbines, Turbomachinery, Turbulence
Proceedings Papers

Effects of Riblet Dimensions on the Transitional Boundary Layers Over High-Lift Turbine Blades

Available to Purchase

S. M. Ananth, Massimiliano Nardini, Aditya Vaid, Melissa Kozul, Nagabhushana Rao Vadlamani, Richard D. Sandberg
Proc. ASME. GT2023, Volume 13B: Turbomachinery — Axial Flow Turbine Aerodynamics, V13BT30A036, June 26–30, 2023
Publisher: American Society of Mechanical Engineers
Paper No: GT2023-103536
https://doi.org/10.1115/GT2023-103536
View Paper titled, Effects of Riblet Dimensions on the Transitional Boundary Layers Over High-Lift Turbine Blades
Open the PDF for Effects of Riblet Dimensions on the Transitional Boundary Layers Over High-Lift Turbine Blades in another window
Topics: Boundary layers, Dimensions, Turbine blades, Surface roughness, Blades, Skin friction (Fluid dynamics), Bubbles, Drag (Fluid dynamics), Flow (Dynamics), Separation (Technology)
Proceedings Papers

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

Available to Purchase

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

Available to Purchase

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
Open the PDF for 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 in another window
Topics: Cascades (Fluid dynamics), Engineering simulation, Flow (Dynamics), Pressure, Reynolds-averaged Navier–Stokes equations, Simulation, Turbines, Engines, Boundary layers, Computational fluid dynamics
Proceedings Papers

Predicting Transitional and Turbulent Flow Around a Turbine Blade With a Physics-Informed Neural Network

Available to Purchase

Sean K. Hanrahan, Melissa Kozul, Richard D. Sandberg
Proc. ASME. GT2023, Volume 13C: Turbomachinery — Deposition, Erosion, Fouling, and Icing; Design Methods and CFD Modeling for Turbomachinery; Ducts, Noise, and Component Interactions, V13CT32A010, June 26–30, 2023
Publisher: American Society of Mechanical Engineers
Paper No: GT2023-101238
https://doi.org/10.1115/GT2023-101238
View Paper titled, Predicting Transitional and Turbulent Flow Around a Turbine Blade With a Physics-Informed Neural Network
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Topics: Artificial neural networks, Modeling, Physics, Pressure, Turbine blades, Turbulence