All Outputs (16)

Numerical analysis of the performance of a composite marine propeller blade subject to structural blade oscillations (2023)
Journal Article
Win Naung, S., Nakhchi, M. E., & Rahmati, M. (2023). Numerical analysis of the performance of a composite marine propeller blade subject to structural blade oscillations. Ocean Engineering, 290, Article 116324. https://doi.org/10.1016/j.oceaneng.2023.116324

High-fidelity Large Eddy Simulations (LES) are conducted over the oscillating marine propeller blades to investigate the effects of blade oscillation on the unsteady flow behaviour as well as to analyse the performance of the composite marine propell... Read More about Numerical analysis of the performance of a composite marine propeller blade subject to structural blade oscillations.

Wake and power prediction of horizontal-axis wind farm under yaw-controlled conditions with machine learning (2023)
Journal Article
Nakhchi, M. E., Win Naung, S., & Rahmati, M. (2023). Wake and power prediction of horizontal-axis wind farm under yaw-controlled conditions with machine learning. Energy Conversion and Management, 296, https://doi.org/10.1016/j.enconman.2023.117708

The main objective of this study is to employ the Extreme Gradient Boosting (XGBoost) machine learning algorithm to predict the power, wake, and turbulent characteristics of horizontal-axis wind farms under yaw-controlled conditions. For this purpose... Read More about Wake and power prediction of horizontal-axis wind farm under yaw-controlled conditions with machine learning.

Investigation of the strain rate sensitivity of CoCrFeMnNiTix(x = 0, 0.3) high-entropy alloys using the shear punch test (2023)
Journal Article
González, S., Sfikas, A. K., Kamnis, S., John, S. E., Barnard, N. C., Gammer, C., …Lancaster, R. J. (2023). Investigation of the strain rate sensitivity of CoCrFeMnNiTix(x = 0, 0.3) high-entropy alloys using the shear punch test. Materials and Design, 233, Article 112294. https://doi.org/10.1016/j.matdes.2023.112294

High entropy alloys (HEAs) are a novel class of metallic materials that exhibit a unique blend of properties due to their chemical composition and atomic arrangement. This research aims to investigate the strain rate sensitivity (SRS) of two HEA CoCr... Read More about Investigation of the strain rate sensitivity of CoCrFeMnNiTix(x = 0, 0.3) high-entropy alloys using the shear punch test.

Direct numerical simulations of turbulent flow over low-pressure turbine blades with aeroelastic vibrations and inflow wakes (2023)
Journal Article
Erfanian Nakhchi, M., Win Naung, S., & Rahmati, M. (2023). Direct numerical simulations of turbulent flow over low-pressure turbine blades with aeroelastic vibrations and inflow wakes. Energies, 16(6), Article 2803. https://doi.org/10.3390/en16062803

In the present work, direct numerical simulation is employed to investigate the unsteady flow characteristics and energy performance of low-pressure turbines (LPT) by considering the blades aeroelastic vibrations and inflow wakes. The effects of infl... Read More about Direct numerical simulations of turbulent flow over low-pressure turbine blades with aeroelastic vibrations and inflow wakes.

Computational and experimental investigation of the strain rate sensitivity of small punch testing of the high-entropy alloy CoCrFeMnNi (2022)
Journal Article
González, S., Sfikas, A. K., Kamnis, S., John, S. E., Nye, Z. W., Spink, M., …Lancaster, R. J. (2023). Computational and experimental investigation of the strain rate sensitivity of small punch testing of the high-entropy alloy CoCrFeMnNi. Journal of Alloys and Compounds, 936, Article 168219. https://doi.org/10.1016/j.jallcom.2022.168219

The suitability of determining the strain rate sensitivity (SRS) of the CoCrFeMnNi high-entropy alloy (HEA) by small punch (SP) testing has been assessed at displacement rates ranging from 0.2 to 2 mm∙min−1. The stress was found to increase as the di... Read More about Computational and experimental investigation of the strain rate sensitivity of small punch testing of the high-entropy alloy CoCrFeMnNi.

Direct numerical simulations of aerodynamic performance of wind turbine aerofoil by considering the blades active vibrations (2022)
Journal Article
Nakhchi, M. E., Win Naung, S., Dala, L., & Rahmati, M. (2022). Direct numerical simulations of aerodynamic performance of wind turbine aerofoil by considering the blades active vibrations. Renewable Energy, 191, 669-684. https://doi.org/10.1016/j.renene.2022.04.052

In the present study, the aerodynamic performance of the horizontal-axis wind turbine blades by considering the flap-wise oscillations are numerically investigated by using direct numerical simulations (DNS). The details of flow structure can be anal... Read More about Direct numerical simulations of aerodynamic performance of wind turbine aerofoil by considering the blades active vibrations.

A novel hybrid control strategy of wind turbine wakes in tandem configuration to improve power production (2022)
Journal Article
Nakhchi, M. E., Win Naung, S., & Rahmati, M. (2022). A novel hybrid control strategy of wind turbine wakes in tandem configuration to improve power production. Energy Conversion and Management, 260, https://doi.org/10.1016/j.enconman.2022.115575

The wind turbines that operate in the wake region of the upstream turbines produce less power and may suffer serious structural issues due to highly unsteady flows, which can reduce the life expectancy of the turbines. In this study, a novel hybrid w... Read More about A novel hybrid control strategy of wind turbine wakes in tandem configuration to improve power production.

Influence of blade vibrations on aerodynamic performance of axial compressor in gas turbine: Direct numerical simulation (2021)
Journal Article
Nakhchi, M. E., Win Naung, S., & Rahmati, M. (2022). Influence of blade vibrations on aerodynamic performance of axial compressor in gas turbine: Direct numerical simulation. Energy, 242, Article 122988. https://doi.org/10.1016/j.energy.2021.122988

Flutter instability because of the blade vibrations is a major problem in axial compressor cascades. This paper investigates the effects of blade oscillations on aerodynamic performance and turbulent flow characteristics of modern gas-turbine compres... Read More about Influence of blade vibrations on aerodynamic performance of axial compressor in gas turbine: Direct numerical simulation.

Prediction of flutter effects on transient flow structure and aeroelasticity of low-pressure turbine cascade using direct numerical simulations (2021)
Journal Article
Win Naung, S., Nakhchi, M. E., & Rahmati, M. (2021). Prediction of flutter effects on transient flow structure and aeroelasticity of low-pressure turbine cascade using direct numerical simulations. Aerospace Science and Technology, 119, Article 107151. https://doi.org/10.1016/j.ast.2021.107151

The aerodynamic characteristics of advanced low-pressure turbines (LPTs) could be affected by the interaction between the transitional and turbulent flow and the dynamic behaviour of the blades. Consequently, analysing the details of the interactions... Read More about Prediction of flutter effects on transient flow structure and aeroelasticity of low-pressure turbine cascade using direct numerical simulations.

An experimental and numerical study on the aerodynamic performance of vibrating wind turbine blade with frequency-domain method (2021)
Journal Article
Win Naung, S., Nakhchi, M. E., & Rahmati, M. (2021). An experimental and numerical study on the aerodynamic performance of vibrating wind turbine blade with frequency-domain method. Journal of Applied and Computational Mathematics, 7(3), 1737-1750. https://doi.org/10.22055/jacm.2021.37406.3011

Abstract. A highly efficient nonlinear frequency-domain solution method is proposed and employed to investigate the aerodynamic and aeromechanical performances of an oscillating wind turbine blade aerofoil in this study. Extensive validations of a fr... Read More about An experimental and numerical study on the aerodynamic performance of vibrating wind turbine blade with frequency-domain method.

High-fidelity CFD simulations of two wind turbines in arrays using nonlinear frequency domain solution method (2021)
Journal Article
Win Naung, S., Nakhchi, M. E., & Rahmati, M. (2021). High-fidelity CFD simulations of two wind turbines in arrays using nonlinear frequency domain solution method. Renewable Energy, 174, 984-1005. https://doi.org/10.1016/j.renene.2021.04.067

Aerodynamics of a wind turbine within windfarms is strongly influenced by the wake of neighbouring turbines. In particular, the performance of a wind turbine can be dramatically reduced depending on its location in the wake region of an upstream turb... Read More about High-fidelity CFD simulations of two wind turbines in arrays using nonlinear frequency domain solution method.

High-resolution direct numerical simulations of flow structure and aerodynamic performance of wind turbine airfoil at wide range of Reynolds numbers (2021)
Journal Article
Nakhchi, M. E., Win Naung, S., & Rahmati, M. (2021). High-resolution direct numerical simulations of flow structure and aerodynamic performance of wind turbine airfoil at wide range of Reynolds numbers. Energy, 225, Article 120261. https://doi.org/10.1016/j.energy.2021.120261

The objective of this study is to develop direct numerical simulations (DNS) to investigate the aerodynamic performance, transition to turbulence, and to capture the laminar separation bubble occurring on a wind turbine blade. Simulations are conduct... Read More about High-resolution direct numerical simulations of flow structure and aerodynamic performance of wind turbine airfoil at wide range of Reynolds numbers.

Aeromechanical analysis of a complete wind turbine using nonlinear frequency domain solution method (2021)
Journal Article
Win Naung, S., Rahmati, M., & Farokhi, H. (2021). Aeromechanical analysis of a complete wind turbine using nonlinear frequency domain solution method. Journal of Engineering for Gas Turbines and Power, 143(1), Article 011018. https://doi.org/10.1115/1.4049206

The high-fidelity computational fluid dynamics (CFD) simulations of a complete wind turbine model usually require significant computational resources. It will require much more resources if the fluid-structure interactions (FSIs) between the blade an... Read More about Aeromechanical analysis of a complete wind turbine using nonlinear frequency domain solution method.

Nonlinear frequency domain solution method for aerodynamic and aeromechanical analysis of wind turbines (2020)
Journal Article
Win Naung, S., Rahmati, M., & Farokhi, H. (2021). Nonlinear frequency domain solution method for aerodynamic and aeromechanical analysis of wind turbines. Renewable Energy, 167, 66-81. https://doi.org/10.1016/j.renene.2020.11.046

The aerodynamic simulations of wind turbines are typically carried out using a steady inflow condition. However, the aerodynamics and aeroelasticity of wind turbine blades can be significantly affected by inflow wakes due to the environmental conditi... Read More about Nonlinear frequency domain solution method for aerodynamic and aeromechanical analysis of wind turbines.

Direct numerical simulation of interaction between transient flow and blade structure in a modern low-pressure turbine (2020)
Journal Article
Win Naung, S., Rahmati, M., & Farokhi, H. (2021). Direct numerical simulation of interaction between transient flow and blade structure in a modern low-pressure turbine. International Journal of Mechanical Sciences, 192, Article 106104. https://doi.org/10.1016/j.ijmecsci.2020.106104

A feature of a modern aeronautical Low-Pressure Turbine (LPT) is the high blade loadings with complex, transient and separated flow regimes. Most existing research have focused only on analysing the transient flow and flow separation in such turbines... Read More about Direct numerical simulation of interaction between transient flow and blade structure in a modern low-pressure turbine.

DNS of secondary flows over oscillating low-pressure turbine using spectral/hp element method (2020)
Journal Article
Nakhchi, M. E., Win Naung, S., & Rahmati, M. (2020). DNS of secondary flows over oscillating low-pressure turbine using spectral/hp element method. International Journal of Heat and Fluid Flow, 86, Article 108684. https://doi.org/10.1016/j.ijheatfluidflow.2020.108684

This paper investigates the secondary vortex flows over an oscillating low-pressure turbine blade using a direct numerical simulation (DNS) method. The unsteady flow governing equations over the oscillating blade are discretized and solved using a sp... Read More about DNS of secondary flows over oscillating low-pressure turbine using spectral/hp element method.