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Journal Articles

Full-Annulus Simulation of Nonsynchronous Blade Vibration Excitation of an Axial Compressor

Daniel Espinal, Hong-Sik Im, Ge-Cheng Zha
Journal: Journal of Turbomachinery
Publisher: ASME
Article Type: Research-Article
J. Turbomach. March 2018, 140(3): 031008.
Paper No: TURBO-16-1261
https://doi.org/10.1115/1.4038337
Published Online: December 27, 2017
View Article titled, Full-Annulus Simulation of Nonsynchronous Blade Vibration Excitation of an Axial Compressor
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Topics: Annulus, Blades, Compressors, Excitation, Flow (Dynamics), Rotors, Simulation, Stators, Pressure, Vibration
Proceedings Papers

Numerical Examination of Lock-In Hypothesis of Non-Synchronous Vibration in an Axial Compressor

Jiaye Gan, Hong-Sik Im, Ge-Cheng Zha
Proc. ASME. GT2017, Volume 7B: Structures and Dynamics, V07BT36A025, June 26–30, 2017
Publisher: American Society of Mechanical Engineers
Paper No: GT2017-65244
https://doi.org/10.1115/GT2017-65244
View Paper titled, Numerical Examination of Lock-In Hypothesis of Non-Synchronous Vibration in an Axial Compressor
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Topics: Compressors, Locks (Waterways), Vibration, Blades, Flow (Dynamics), Excitation, Simulation, Structural response analysis, Annulus, Diffusion (Physics)
Journal Articles

Performance Metric for Turbine Stage Under Unsteady Pulsating Flow Environment

Jinwook Lee, Choon S. Tan, Borislav T. Sirakov, Hong-Sik Im, Martin Babak, Denis Tisserant, Chris Wilkins
Journal: Journal of Engineering for Gas Turbines and Power
Publisher: ASME
Article Type: Research-Article
J. Eng. Gas Turbines Power. July 2017, 139(7): 072606.
Paper No: GTP-16-1562
https://doi.org/10.1115/1.4035630
Published Online: March 7, 2017
View Article titled, Performance Metric for Turbine Stage Under Unsteady Pulsating Flow Environment
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Topics: Entropy, Pulsatile flow, Storage, Turbines, Turbochargers, Unsteady flow, Cycles, Approximation, Flow (Dynamics)
Journal Articles

Performance Characterization of Twin-Scroll Turbine Stage for Vehicular Turbocharger Under Unsteady Pulsating Flow Environment

Jinwook Lee, Choon S. Tan, Borislav T. Sirakov, Hong-Sik Im, Martin Babak, Denis Tisserant, Chris Wilkins
Journal: Journal of Engineering for Gas Turbines and Power
Publisher: ASME
Article Type: Research-Article
J. Eng. Gas Turbines Power. July 2017, 139(7): 072701.
Paper No: GTP-16-1561
https://doi.org/10.1115/1.4035629
Published Online: February 28, 2017
View Article titled, Performance Characterization of Twin-Scroll Turbine Stage for Vehicular Turbocharger Under Unsteady Pulsating Flow Environment
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Topics: Computational fluid dynamics, Diffusers, Flow (Dynamics), Modeling, Turbines, Wheels, Pressure, Errors, Turbochargers
Proceedings Papers

Performance Characterization of Twin Scroll Turbine Stage for Vehicular Turbocharger Under Unsteady Pulsating Flow Environment

Jinwook Lee, Choon S. Tan, Borislav T. Sirakov, Chris Wilkins, Hong-Sik Im, Martin Babak, Denis Tisserant
Proc. ASME. GT2016, Volume 2D: Turbomachinery, V02DT44A009, June 13–17, 2016
Publisher: American Society of Mechanical Engineers
Paper No: GT2016-56401
https://doi.org/10.1115/GT2016-56401
View Paper titled, Performance Characterization of Twin Scroll Turbine Stage for Vehicular Turbocharger Under Unsteady Pulsating Flow Environment
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Topics: Performance characterization, Pulsatile flow, Turbines, Turbochargers, Flow (Dynamics), Pressure, Computational fluid dynamics, Diffusers, Wheels, Acoustics
Proceedings Papers

A 3D Approximate Riemann Solver for the Euler Equations Using Flux Splitting Schemes With a Robust Multigrid

Hong-Sik Im
Proc. ASME. GT2016, Volume 2C: Turbomachinery, V02CT39A002, June 13–17, 2016
Publisher: American Society of Mechanical Engineers
Paper No: GT2016-56057
https://doi.org/10.1115/GT2016-56057
View Paper titled, A 3D Approximate Riemann Solver for the Euler Equations Using Flux Splitting Schemes With a Robust Multigrid
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Topics: Shock (Mechanics), Steady state
Proceedings Papers

Delayed Detached Eddy Simulation of Rotating Stall for a Full Annulus Transonic Axial Compressor Stage

Jiaye Gan, Hong-Sik Im, Ge-Cheng Zha
Proc. ASME. GT2016, Volume 2A: Turbomachinery, V02AT37A051, June 13–17, 2016
Publisher: American Society of Mechanical Engineers
Paper No: GT2016-57985
https://doi.org/10.1115/GT2016-57985
View Paper titled, Delayed Detached Eddy Simulation of Rotating Stall for a Full Annulus Transonic Axial Compressor Stage
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Topics: Annulus, Compressors, Eddies (Fluid dynamics), Simulation, Rotors, Stall inception, Delay differential equations, Stators, Blades, Boundary-value problems
Proceedings Papers

Performance Metric for Turbine Stage Under Unsteady Pulsating Flow Environment

Jinwook Lee, Choon S. Tan, Borislav T. Sirakov, Chris Wilkins, Hong-Sik Im, Martin Babak, Denis Tisserant
Proc. ASME. GT2016, Volume 2D: Turbomachinery, V02DT44A006, June 13–17, 2016
Publisher: American Society of Mechanical Engineers
Paper No: GT2016-56343
https://doi.org/10.1115/GT2016-56343
View Paper titled, Performance Metric for Turbine Stage Under Unsteady Pulsating Flow Environment
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Topics: Pulsatile flow, Turbines, Entropy, Storage, Turbochargers, Combustion chambers, Engines, Explosions, Flow (Dynamics), Second law of thermodynamics
Proceedings Papers

Investigation of a Compressor Rotor Non-Synchronous Vibration With and Without Fluid-Structure Interaction

Jiaye Gan, Hong-sik Im, Daniel Espinal, Alexis Lefebvre, Ge-Cheng Zha
Proc. ASME. GT2014, Volume 7B: Structures and Dynamics, V07BT35A018, June 16–20, 2014
Publisher: American Society of Mechanical Engineers
Paper No: GT2014-26478
https://doi.org/10.1115/GT2014-26478
View Paper titled, Investigation of a Compressor Rotor Non-Synchronous Vibration With and Without Fluid-Structure Interaction
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Topics: Compressors, Fluid structure interaction, Rotors, Vibration, Blades, Simulation, Vortices, Excitation, Stators, Annulus
Journal Articles

Delayed Detached Eddy Simulation of Airfoil Stall Flows Using High-Order Schemes

Hong-Sik Im, Ge-Cheng Zha
Journal: Journal of Fluids Engineering
Publisher: ASME
Article Type: Research-Article
J. Fluids Eng. November 2014, 136(11): 111104.
Paper No: FE-13-1122
https://doi.org/10.1115/1.4027813
Published Online: September 4, 2014
View Article titled, Delayed Detached Eddy Simulation of Airfoil Stall Flows Using High-Order Schemes
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Topics: Airfoils, Boundary layers, Delay differential equations, Drag (Fluid dynamics), Eddies (Fluid dynamics), Flow (Dynamics), Simulation, Flat plates, Reynolds-averaged Navier–Stokes equations
Proceedings Papers

Flutter Prediction of a Transonic Fan With Travelling Wave Using Fully Coupled Fluid/Structure Interaction

Hong-Sik Im, Ge-Cheng Zha
Proc. ASME. GT2013, Volume 7B: Structures and Dynamics, V07BT33A003, June 3–7, 2013
Publisher: American Society of Mechanical Engineers
Paper No: GT2013-94341
https://doi.org/10.1115/GT2013-94341
View Paper titled, Flutter Prediction of a Transonic Fan With Travelling Wave Using Fully Coupled Fluid/Structure Interaction
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Topics: Fluid structure interaction, Flutter (Aerodynamics), Traveling waves, Blades, Shock (Mechanics), Engineering simulation, Simulation, Annulus, Boundary-value problems, Chords (Trusses)
Journal Articles

Large Eddy Simulation of Coflow Jet Airfoil at High Angle of Attack

Hong-Sik Im, Ge-Cheng Zha, Bertrand P. E. Dano
Journal: Journal of Fluids Engineering
Publisher: ASME
Article Type: Research-Article
J. Fluids Eng. February 2014, 136(2): 021101.
Paper No: FE-13-1240
https://doi.org/10.1115/1.4025649
Published Online: November 12, 2013
View Article titled, Large Eddy Simulation of Coflow Jet Airfoil at High Angle of Attack
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Topics: Airfoils, Flow (Dynamics), Drag (Fluid dynamics), Momentum
Proceedings Papers

Effects of Rotor Tip Clearance on Tip Clearance Flow Potentially Leading to NSV in an Axial Compressor

Hong-Sik Im, Ge-Cheng Zha
Proc. ASME. GT2012, Volume 7: Structures and Dynamics, Parts A and B, 1383-1394, June 11–15, 2012
Publisher: American Society of Mechanical Engineers
Paper No: GT2012-68148
https://doi.org/10.1115/GT2012-68148
View Paper titled, Effects of Rotor Tip Clearance on Tip Clearance Flow Potentially Leading to NSV in an Axial Compressor
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Topics: Clearances (Engineering), Compressors, Flow (Dynamics), Rotors, Wake turbulence, Annulus, Blades, Boundary-value problems, Computer simulation, Leakage flows
Proceedings Papers

Simulation of Non-Synchronous Blade Vibration of an Axial Compressor Using a Fully Coupled Fluid/Structure Interaction

Hong-Sik Im, Ge-Cheng Zha
Proc. ASME. GT2012, Volume 7: Structures and Dynamics, Parts A and B, 1395-1407, June 11–15, 2012
Publisher: American Society of Mechanical Engineers
Paper No: GT2012-68150
https://doi.org/10.1115/GT2012-68150
View Paper titled, Simulation of Non-Synchronous Blade Vibration of an Axial Compressor Using a Fully Coupled Fluid/Structure Interaction
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Topics: Blades, Compressors, Fluid structure interaction, Simulation, Vibration, Rotors, Boundary-value problems, Stators, Annulus, Engines
Proceedings Papers

Detached Eddy Simulation of Unsteady Stall Flows of a Full Annulus Transonic Rotor

Hong-Sik Im, Xiangying Chen, Ge-Cheng Zha
Proc. ASME. GT2010, Volume 7: Turbomachinery, Parts A, B, and C, 2627-2642, June 14–18, 2010
Publisher: American Society of Mechanical Engineers
Paper No: GT2010-23465
https://doi.org/10.1115/GT2010-23465
View Paper titled, Detached Eddy Simulation of Unsteady Stall Flows of a Full Annulus Transonic Rotor
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Topics: Annulus, Eddies (Fluid dynamics), Flow (Dynamics), Rotors, Simulation, Blades, Delay differential equations, Pressure, Axial flow, Clearances (Engineering)