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Saif Ullah
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Journal Articles

Closure to “Discussion of ‘Some Exact Analytical Solutions for Two-Dimensional Flow of an Incompressible Second Grade Fluid’” (2015, ASME J. Fluids Eng., 137(10), p. 101206)

Saif Ullah
Journal: Journal of Fluids Engineering
Publisher: ASME
Article Type: Closures
J. Fluids Eng. December 2024, 146(12): 126001.
Paper No: FE-24-1216
https://doi.org/10.1115/1.4065809
Published Online: July 25, 2024
View Article titled, Closure to “Discussion of ‘Some Exact Analytical Solutions for Two-Dimensional Flow of an Incompressible Second Grade Fluid’” (2015, ASME J. Fluids Eng., 137(10), p. 101206)
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Topics: Flow (Dynamics), Fluids
Journal Articles

Geometric Characteristics of Flapping Foils for Enhanced Propulsive Efficiency

John M. Kelly, Muhammad Saif Ullah Khalid, Pan Han, Haibo Dong
Journal: Journal of Fluids Engineering
Publisher: ASME
Article Type: Research-Article
J. Fluids Eng. June 2023, 145(6): 061104.
Paper No: FE-22-1402
https://doi.org/10.1115/1.4057018
Published Online: March 20, 2023
View Article titled, Geometric Characteristics of Flapping Foils for Enhanced Propulsive Efficiency
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Topics: Flow (Dynamics), Pressure, Shapes, Thrust, Vortices, Kinematics, Chords (Trusses), Reynolds number, Energy consumption
Proceedings Papers

Effect of Phase Difference on Wake Characteristics and Propulsive Performance of Pitching Foils in Side-by-Side Configurations

Ahmet Gungor, Muhammad Saif Ullah Khalid, Arman Hemmati
Proc. ASME. FEDSM2022, Volume 2: Multiphase Flow (MFTC); Computational Fluid Dynamics (CFDTC); Micro and Nano Fluid Dynamics (MNFDTC), V002T05A031, August 3–5, 2022
Publisher: American Society of Mechanical Engineers
Paper No: FEDSM2022-87980
https://doi.org/10.1115/FEDSM2022-87980
View Paper titled, Effect of Phase Difference on Wake Characteristics and Propulsive Performance of Pitching Foils in Side-by-Side Configurations
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Topics: Wakes
Proceedings Papers

Nusselt Number Dependence on Aspect Ratio and Rayleigh Number: A Numerical Study of Rayleigh-Benard Instability

Wajeeha Siddiqui, Zafar Abbas, Imran Akhtar, Muhammad Saif Ullah Khalid
Proc. ASME. FEDSM2022, Volume 2: Multiphase Flow (MFTC); Computational Fluid Dynamics (CFDTC); Micro and Nano Fluid Dynamics (MNFDTC), V002T05A029, August 3–5, 2022
Publisher: American Society of Mechanical Engineers
Paper No: FEDSM2022-87897
https://doi.org/10.1115/FEDSM2022-87897
View Paper titled, Nusselt Number Dependence on Aspect Ratio and Rayleigh Number: A Numerical Study of Rayleigh-Benard Instability
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Topics: Cavities, Computer simulation, Rayleigh number, Rayleigh-Benard instability
Proceedings Papers

Numerical Analysis to Study the Effect of Control Temperature Location Inside a Datacenter

Atta Ul Mannan Hashmi, Arshan Ahmed Tipu, Fahad Rafi Butt, Imran Akhtar, Muhammad Saif Ullah Khalid
Proc. ASME. FEDSM2022, Volume 2: Multiphase Flow (MFTC); Computational Fluid Dynamics (CFDTC); Micro and Nano Fluid Dynamics (MNFDTC), V002T05A028, August 3–5, 2022
Publisher: American Society of Mechanical Engineers
Paper No: FEDSM2022-87885
https://doi.org/10.1115/FEDSM2022-87885
View Paper titled, Numerical Analysis to Study the Effect of Control Temperature Location Inside a Datacenter
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Topics: HVAC equipment, Numerical analysis, Temperature, Temperature sensors, Cloud computing, Computational fluid dynamics, Computer simulation, Control systems, Cooling systems, Energy consumption
Journal Articles

Nonlinear Reduced-Order Models for Aerodynamic Lift of Oscillating Airfoils

Muhammad Saif Ullah Khalid, Imran Akhtar
Journal: Journal of Computational and Nonlinear Dynamics
Publisher: ASME
Article Type: Research-Article
J. Comput. Nonlinear Dynam. September 2017, 12(5): 051019.
Paper No: CND-16-1603
https://doi.org/10.1115/1.4036346
Published Online: May 17, 2017
View Article titled, Nonlinear Reduced-Order Models for Aerodynamic Lift of Oscillating Airfoils
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Topics: Airfoils, Computational fluid dynamics, Lift (Fluid dynamics)
Proceedings Papers

Nonlinear Characterization of Heart Rate Variability in Normal Sinus Rhythm, Atrial Fibrillation and Congestive Heart Failure

Syed Hassan Zaidi, Imran Akhtar, Syed Imran Majeed, Tahir Zaidi, Muhammad Saif Ullah Khalid
Proc. ASME. IMECE2016, Volume 3: Biomedical and Biotechnology Engineering, V003T04A061, November 11–17, 2016
Publisher: American Society of Mechanical Engineers
Paper No: IMECE2016-66836
https://doi.org/10.1115/IMECE2016-66836
View Paper titled, Nonlinear Characterization of Heart Rate Variability in Normal Sinus Rhythm, Atrial Fibrillation and Congestive Heart Failure
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Topics: Heart failure, Cardiovascular system, Dynamics (Mechanics), Physiology, Time series, Algorithms, Risk
Proceedings Papers

Nonlinear Reduced-Order Models for Aerodynamic Lift of Oscillating Airfoils

Muhammad Saif Ullah Khalid, Imran Akhtar
Proc. ASME. IMECE2016, Volume 4A: Dynamics, Vibration, and Control, V04AT05A043, November 11–17, 2016
Publisher: American Society of Mechanical Engineers
Paper No: IMECE2016-66859
https://doi.org/10.1115/IMECE2016-66859
View Paper titled, Nonlinear Reduced-Order Models for Aerodynamic Lift of Oscillating Airfoils
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Topics: Airfoils, Lift (Fluid dynamics), Computer simulation, Damping, Aerodynamics, Attractors, Computational fluid dynamics, Emission spectroscopy, Excitation, Flow (Dynamics)
Journal Articles

Some Exact Analytical Solutions for Two-Dimensional Flow of an Incompressible Second Grade Fluid

Saif Ullah
Journal: Journal of Fluids Engineering
Publisher: ASME
Article Type: Research-Article
J. Fluids Eng. October 2015, 137(10): 101206.
Paper No: FE-14-1660
https://doi.org/10.1115/1.4030491
Published Online: October 1, 2015
View Article titled, Some Exact Analytical Solutions for Two-Dimensional Flow of an Incompressible Second Grade Fluid
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Topics: Flow (Dynamics), Fluids, Separation (Technology)
Journal Articles

Reduced-Order Modeling of Torque on a Vertical-Axis Wind Turbine at Varying Tip Speed Ratios

Muhammad Saif Ullah Khalid, Tariq Rabbani, Imran Akhtar, Naveed Durrani, M. Salman Siddiqui
Journal: Journal of Computational and Nonlinear Dynamics
Publisher: ASME
Article Type: Research-Article
J. Comput. Nonlinear Dynam. July 2015, 10(4): 041012.
Paper No: CND-14-1055
https://doi.org/10.1115/1.4028064
Published Online: July 1, 2015
View Article titled, Reduced-Order Modeling of Torque on a Vertical-Axis Wind Turbine at Varying Tip Speed Ratios
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Topics: Torque, Turbines, Vertical axis wind turbines, Computational fluid dynamics
Journal Articles

Some Exact Solutions to Equations of Motion of an Incompressible Second Grade Fluid

Saif Ullah, Irsa Maqbool
Journal: Journal of Fluids Engineering
Publisher: ASME
Article Type: Research-Article
J. Fluids Eng. January 2015, 137(1): 011205.
Paper No: FE-13-1752
https://doi.org/10.1115/1.4027826
Published Online: September 10, 2014
View Article titled, Some Exact Solutions to Equations of Motion of an Incompressible Second Grade Fluid
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Topics: Flow (Dynamics), Fluids, Vorticity, Equations of motion
Proceedings Papers

Numerical Study to Analyze the Effects of Hot/Cold Aisle Configurations on Heat Transfer Phenomenon in a Data Center

Kamran Nazir, Naveed Durrani, Imran Akhtar, M. Saif Ullah Khalid
Proc. ASME. IMECE2013, Volume 8B: Heat Transfer and Thermal Engineering, V08BT09A030, November 15–21, 2013
Publisher: American Society of Mechanical Engineers
Paper No: IMECE2013-64457
https://doi.org/10.1115/IMECE2013-64457
View Paper titled, Numerical Study to Analyze the Effects of Hot/Cold Aisle Configurations on Heat Transfer Phenomenon in a Data Center
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Topics: Data centers, Heat transfer
Proceedings Papers

GPU-Based Simulations to Analyze the Effect of Heat Source in Mixed Convection

Nabeel A. Qazi, Imran Akhtar, M. Saif Ullah Khalid
Proc. ASME. IMECE2012, Volume 7: Fluids and Heat Transfer, Parts A, B, C, and D, 361-371, November 9–15, 2012
Publisher: American Society of Mechanical Engineers
Paper No: IMECE2012-85850
https://doi.org/10.1115/IMECE2012-85850
View Paper titled, GPU-Based Simulations to Analyze the Effect of Heat Source in Mixed Convection
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Topics: Engineering simulation, Graphics processing units, Heat, Mixed convection, Simulation, Cavities, Thermofluids, Computation, Computer programming languages, Computer simulation
Proceedings Papers

Characteristics of Flow Past a Symmetric Airfoil at Low Reynolds Number: A Nonlinear Perspective

M. Saif Ullah Khalid, Imran Akhtar
Proc. ASME. IMECE2012, Volume 7: Fluids and Heat Transfer, Parts A, B, C, and D, 167-175, November 9–15, 2012
Publisher: American Society of Mechanical Engineers
Paper No: IMECE2012-87389
https://doi.org/10.1115/IMECE2012-87389
View Paper titled, Characteristics of Flow Past a Symmetric Airfoil at Low Reynolds Number: A Nonlinear Perspective
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Topics: Airfoils, Flow (Dynamics), Reynolds number, Aerodynamics, Chaos, Fluid-dynamic forces, Bifurcation, Computer simulation, Drag (Fluid dynamics), Emission spectroscopy
Journal Articles

Some Exact Solutions to Equations of Motion of an Incompressible Third Grade Fluid

Saif Ullah
Journal: Journal of Fluids Engineering
Publisher: ASME
Article Type: Research Papers
J. Fluids Eng. June 2008, 130(6): 061401.
https://doi.org/10.1115/1.2928407
Published Online: May 19, 2008
View Article titled, Some Exact Solutions to Equations of Motion of an Incompressible Third Grade Fluid
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Topics: Flow (Dynamics), Fluids, Equations of motion, Vorticity