Publications

Year 2026

• U. Shrestha, S.-J. Kim, J. Park, K.-H. Ko, and Y.-D. Choi, “Quantitative Evaluation of Cavitation-Instability Parameters in Francis Hydro Turbine,” New & Renewable Energy 

   DOI - 10.7849/ksnre.2026.0010 

• U. Shrestha, H. W. Heo, Y.-C. Hwang, and Y.-D. Choi, “Influence of trailing edge shapes of Francis hydro turbine runner on the sound pressure level,” Journal of Mechanical Science and Technology.

    DOI - https://doi.org/10.1007/s12206-026-0727-6 

• U. Shrestha and Y.-D. Choi, “Optimization of Impeller Blade Angle to Improve Unsteady S-Curve Characteristics in 3 kW-class Pump Turbine Model,” New & Renewable Energy.

     DOI - https://doi.org/10.7849/ksnre.2026.2046

• U. Shrestha, S.-H. Baek, H.-S. Kim, H. Cho, and Y.-D. Choi, “AI-based fast design optimization of rib structure in the sloshing tank to suppress sloshing dynamics,” Journal of Mechanical Science and Technology. 

    DOI - https://doi.org/10.1007/s12206-026-0139-7

• E. Fernando, U. Shrestha, D. Kim, and Y.-D. Choi, “Verification of the initial design of a high-head two-stage centrifugal pump on the performance and structural stability by numerical analysis,” Journal of Advanced Marine Engineering and Technology.

    DOI - https://doi.org/10.5916/jamet.2026.50.1.43 

• U. Shrestha, S. Park, and Y.-D. Choi, “Investigation of Suction Performance on a Mixed Flow Pump with Semi-Open Casing,” The KSFM Journal of Fluid Machinery.

    DOI - https://doi.org/10.5293/kfma.2026.29.1.030

• U. Shrestha, J. Kim, and Y.-D. Choi, “Impeller shape optimization considering start-up operation performance of mixed flow pump with semi-open casing,” The KSFM Journal of Fluid Machinery 

   DOI - https://doi.org/10.5293/kfma.2026.29.1.061

Year 2025

• J. Lee et al., “Francis turbine instabilities during off-design and transient operations: A comprehensive review of the state-of-the-art and recent research and development,” Energy Conversion and Management.

DOI - https://doi.org/10.1016/j.ecmx.2025.101384

Year 2024

• Shrestha, Ujjwal & Kim, Hyun-Seok & Cho, Hyunkyoo & Choi, Young Do. (2024). A Numerical Study on the Effects of Liquid Hydrogen Tank Sloshing Parameters and Rib Structure on the Tank Internal Flow. The KSFM Journal of Fluid Machinery.
  DOI -https://doi.org/10.5293/kfma.2024.27.6.053 

• Shrestha, Ujjwal & Jang, Deokho & Choi, Young Do. (2024). CFD Analysis on the Internal Flow of Swirling Ultrafine Bubble Generator for CO₂ Gas Dissolution. The KSFM Journal of Fluid Machinery
  DOI -10.5293/kfma.2024.27.6.014

• Shrestha, Ujjwal & Kim, DaeHoon & Choi, Young Do. (2024). Effect of Shaft Sleeve Design on the Hydraulic and Suction Performances of Two-stage Centrifugal Pump. The KSFM Journal of Fluid Machinery.
  DOI-10.5293/kfma.2024.27.4.016
  
  

• Shrestha, Ujjwal & Choi, Young Do. (2024). Loss Analysis by Impeller Blade Angle in the S-Curve Region of Low Specific Speed Pump Turbine. New & Renewable Energy.
  DOI-10.7849/ksnre.2024.0014
  
  

• Shrestha, Ujjwal & Choi, Young Do. (2024). Influence of Tip Clearance Gap Thickness on the Performance and Internal Flow of Mixed Flow Pump with Semi-open Casing. The KSFM Journal of Fluid Machinery.
  DOI -  10.5293/kfma.2024.27.3.005
  
  

•  Shrestha, Ujjwal & Choi, Young Do. (2024). Effect of Pump Turbine Impeller Blade Angle in the S-Curve Region While Operating in Turbine Mode. The KSFM Journal of Fluid Machinery
  DOI - 10.5293/kfma.2024.27.3.054

• Shrestha, Ujjwal & Choi, Young Do. (2024). Comparison on the Pump Turbine Hydraulic Performance and Internal Flow in S-Curve Region by Specific Speed. The KSFM Journal of Fluid Machinery.
  DOI-10.5293/kfma.2024.27.2.057

Year 2023

• Shrestha, Ujjwal & Kim, DaeHoon & Choi, Young Do. (2023). Thermodynamic Characteristics of the Hydraulic and Suction Performances by the Working Fluid Temperature of Multistage Centrifugal Pump. The KSFM Journal of Fluid Machinery
  DOI - 10.5293/kfma.2023.26.6.090
  
  

• Shrestha, Ujjwal & Kim, Piljea & Choi, Young Do. (2023). Effects of Impeller Blade Shape and Impeller Disk Side Gap Passage Shape on the Regenerative Blower Performance. The KSFM Journal of Fluid Machinery
  DOI -10.5293/kfma.2023.26.5.079
  
  

Year 2022

• Shrestha, Ujjwal & Choi, Young Do. (2022). Estimation of Reverse Flow Rate in J-Groove Channel of AJP and SCP Models Using CFD Analysis Processes.
  DOI - 10.3390/pr10040785  
  
  

• Hoang, Thi & Shrestha, Ujjwal & Choi, Young Do. (2022). Matching performance of single channel pump by the combination of various cross-sectional shapes of impeller outlet and volute casing. Journal of Advanced Marine Engineering and Technology. 46. 77-84.
  DOI -10.5916/jamet.2022.46.2.77  
  
  

• Hoang, ThiHongMinh & Shrestha, Ujjwal & Choi, Young Do. (2022). Hydraulic and Suction Performances of the Screw Centrifugal Pump for Live Fish Transfer According to Impeller Blade Inlet Shapes. The KSFM Journal of Fluid Machinery. 25. 16-25. 
  DOI -10.5293/kfma.2022.25.1.016 

Year 2021

• Hoang, ThiHongMinh & Shrestha, Ujjwal & Choi, Young Do. (2021). Performance of single-channel pump based on various impeller flow passage shape design parameters. Journal of Advanced Marine Engineering and Technology. 45. 371-379. DOI -10.5916/jamet.2021.45.6.371
  
  

• Shrestha, Ujjwal & Choi, Young Do. (2021). Suction performance improvement of an annular jet pump by J-groove passage shape optimization. Journal of Mechanical Science and Technology. 35. 1-11. DOI -10.1007/s12206-021-1123-x 
  
  

• Shrestha, Ujjwal & Choi, Young Do. (2021). Bellmouth Shape Optimization for the Suppression of Flow Instability in a Pump Sump Model. The KSFM Journal of Fluid Machinery. 24. 49-57. DOI  -10.1007/s12206-021-1123-x
   

• Hoang, Thi & Truong, Anh & Shrestha, Ujjwal & Choi, Young Do. (2021). Optimization of the Meridional Plane Shape Design Parameters in a Screw Centrifugal Pump Impeller. The KSFM Journal of Fluid Machinery. 24. 15-25. DOI -10.5293/kfma.2021.24.4.015
  
  

• Shrestha, Ujjwal & Choi, Young Do. (2021). Suppression of flow instability in the Francis hydro turbine draft tube by J-groove shape optimization at a partial flow rate. Journal of Mechanical Science and Technology. 35. DOI -10.1007/s12206-021-0523-2  
  
  

• Shrestha, U., Choi, YD., Park, J. et al. Reduced-dimensional design optimization of stay vane and casing of reaction hydro turbines using global sensitivity analysis. J Mech Sci Technol 35, 1487–1499 (2021). DOI -https://doi.org/10.1007/s12206-021-0314-9
  
  

• Shrestha, Ujjwal & Choi, Young Do. (2021). Suppression of flow instabilities in the stay vane passage of the Francis hydro turbine model by design optimization. Journal of Mechanical Science and Technology. 35. DOI -10.1007/s12206-020-1215-z 

Year 2020

• Shrestha, Ujjwal & Choi, Young Do. (2020). Effect of diffuser angle and J-groove depth on improvement in suction performance of annular jet pump model. Journal of Advanced Marine Engineering and Technology. 44. 385-394. 10.5916/jamet.2020.44.5.385.
  DOI -10.5916/jamet.2020.44.5.385
  
  

• Shrestha, Ujjwal & Choi, Young Do. (2020). A CFD-Based Shape Design Optimization Process of Fixed Flow Passages in a Francis Hydro Turbine. Processes. 8. 1392.
  DOI -10.3390/pr8111392
  
  

• Shrestha, Ujjwal & Choi, Young Do. (2020). Improvement of flow behavior in the spiral casing of Francis hydro turbine model by shape optimization. Journal of Mechanical Science and Technology. 34. 1-10.
  DOI -10.1007/s12206-020-0817-9

• Choi, Young Do & Shrestha, Ujjwal. (2020). Cavitation Performance Improvement of an Annular Jet Pump by J-Groove. The KSFM Journal of Fluid Machinery. 23. 25-35.
  DOI -10.5293/kfma.2020.23.4.025
  
  

• Guo, Ming & Choi, Young Do. (2020). Flow Passage Shape Design of a High Pressure Multistage Centrifugal Pump for Performance Improvement and Miniaturization. The KSFM Journal of Fluid Machinery. 23. 42-50.
  DOI -10.5293/kfma.2020.23.2.042

• M. Guo and Y.-D. Choi, “Effect of Impeller Blade Thickness on the Performance and Internal Flow Characteristics of a Single Channel Pump Model,” The KSFM Journal of Fluid Machinery, vol. 23, no. 1, pp. 15–22, Feb. 2020.
  DOI -10.5293/kfma.2020.23.1.015 

Year 2019

• J-Groove shape optimization to suppress swirl flow in the draft tube of a bulb hydro turbine model
  
  

• Y.-D. CHOI, J. GO, and S. KIM, “ANALYSIS OF A LAMINATED COMPOSITE WIND TURBINE BLADE CHARACTERISTICS THROUGH MATHEMATICAL APPROACH,” Journal of the Korean Society for Industrial and Applied Mathematics , vol. 23, no. 4, pp. 367–380, Dec. 2019.

DOI -https://doi.org/10.12941/jksiam.2019.23.367

• U. Shrestha and Y.-D. Choi, “Effect of J-Groove design parameter on suppression of swirl flow in draft tube of francis hydro turbine,” Journal of the Korean Society of Marine Engineering, vol. 43, no. 8, pp. 631–639, Oct. 2019

DOI-https://doi.org/10.5916/jkosme.2019.43.8.631

• M. Guo, Z. Chen, and Y.-D. Choi, “Design and CFD analysis of screw centrifugal pump model,” Journal of the Korean Society of Marine Engineering, vol. 43, no. 8, pp. 640–647, Oct. 2019

DOI-https://doi.org/10.5916/jkosme.2019.43.8.640

• Nguyen, Q.H., Chen, Z., Lee, Y., & Choi, Y. (2019-11-27). Air entrainment flow characteristics of gate pump-sump models by bell mouth shape . Proceedings of the KFMA Annual Meeting, Jeju.

• Performance analysis of vortex turbines using CFD
  
  

• Experimental study to predict the performance of solar panels
  
  

• U. Shrestha, Z. Chen, and Y. D. Choi, “Correlation of the Sediment Properties and Erosion in Francis Hydro Turbine Runner,” International Journal of Fluid Machinery and Systems, vol. 12, no. 2, pp. 109–118, Jun. 2019

   DOI -https://doi.org/10.5293/IJFMS.2019.12.2.109

• V. L. Vu and Y.-D. Choi, “Performance improvement of an axial flow pump model,” Journal of the Korean Society of Marine Engineering, vol. 43, no. 5, pp. 359–365, Jun. 2019

DOI - https://doi.org/10.5916/jkosme.2019.43.5.359

• S. KIM, S.-B. MA, Y.-S. CHOI, and J.-H. KIM, “Design Optimization of 2 Vane Pump Impeller and Volute for Performance Improvement,” Transctions of the Korean Hydrogen and New Energy Society, vol. 31, no. 4, pp. 395–403, Aug. 2020

DOI -https://doi.org/10.7316/KHNES.2020.31.4.395

• V. L. Vu, Z. Chen, and Y.-D. Choi, “Effect of the Hub to Tip Diameter Ratio to the Performance of a Bulb Hydro Turbine Model,” The KSFM Journal of Fluid Machinery, vol. 22, no. 3, pp. 5–11, Jun. 2019

DOI -https://doi.org/10.5293/kfma.2019.22.3.005

• Z. Chen and Y. Choi, “Suppression of cavitation in the draft tube of Francis turbine model by J-Groove,” Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science, vol. 233, no. 9, pp. 3100–3110, Oct. 2018

DOI -https://doi.org/10.1177/0954406218802310

• Z. Chen, S.-H. Baek, H. Cho, and Y.-D. Choi, “Optimal design of J-groove shape on the suppression of unsteady flow in the Francis turbine draft tube,” Journal of Mechanical Science and Technology, vol. 33, no. 5, pp. 2211–2218, May 2019

DOI -https://doi.org/10.1007/s12206-019-0423-x

• A Study on the Establishment of Analysis Techniques for Pump Turbines for Pumped Storage Power Generation
  
  

• M. Guo and Y.-D. Choi, “The influence of water level and flow rate on vortex occurrence in pump sump,” Journal of the Korean Society of Marine Engineering, vol. 43, no. 2, pp. 102–107, Feb. 2019

DOI -https://doi.org/10.5916/jkosme.2019.43.2.102

• M. Guo and Y.-D. Choi, “Optimum Design on the Meridional Shape of a Multistage Centrifugal Pump Impeller for Performance Improvement,” The KSFM Journal of Fluid Machinery, vol. 22, no. 3, pp. 41–48, Jun. 2019

DOI -https://doi.org/10.5293/kfma.2019.22.3.041

• U. Shrestha, P. M. Singh, and Y. D. Choi, “Design and Experimental Analysis on 3kW class Pump Turbine Model for Renewable ESS,” The KSFM Journal of Fluid Machinery, vol. 22, no. 4, pp. 19–28, Aug. 2019

DOI -https://doi.org/10.5293/kfma.2019.22.4.019

• U. Shrestha, P. M. Singh, and Y. D. Choi, “Suppression of flow instability in draft tube of Pump Turbine using J-Groove,” The KSFM Journal of Fluid Machinery, vol. 22, no. 6, pp. 5–13, Dec. 2019

   DOI - https://doi.org/10.5293/kfma.2019.22.6.005

Year 2018

• V. L. Vu, Z. Chen, and Y.-D. Choi, “Study on swirl flow in a draft tube of a bulb hydro turbine model,” Han-guk marin enjinieoring hakoeji, vol. 42, no. 10, pp. 812–817, Dec. 2018

DOI -https://doi.org/10.5916/jkosme.2018.42.10.812

• V. L. Vu, Z. Chen, and Y.-D. Choi, “Design and Performance of a Pico Propeller Hydro Turbine Model,” The KSFM Journal of Fluid Machinery, vol. 21, no. 3, pp. 44–51, Jun. 2018

DOI -https://doi.org/10.5293/kfma.2018.21.3.044

• U. Shrestha, Z. Chen, and Y.-D. Choi, “Study on the effect of the runner design parameters on 50 MW Francis hydro turbine model performance,” Journal of Physics: Conference Series, vol. 1042, p. 012006, Jun. 2018

DOI -https://doi.org/10.1088/1742-6596/1042/1/012006

Year 2017

• P. M. Singh, Z. Chen, and Y.-D. Choi, “Hydraulic Design of a 3 kW-Class Pump-turbine Model and Performance Investigation by CFD,” The KSFM Journal of Fluid Machinery, vol. 20, no. 6, pp. 12–20, Dec. 2017

DOI -https://doi.org/10.5293/kfma.2017.20.6.012

• Z. Chen, P. M. Singh, and Y.-D. Choi, “Suppression of unsteady swirl flow in the draft tube of a Francis hydro turbine model using J-Groove,” Journal of Mechanical Science and Technology, vol. 31, no. 12, pp. 5813–5820, Dec. 2017

DOI -https://doi.org/10.1007/s12206-017-1123-z

• S.-J. Kim, P. M. Singh, B.-S. Hyun, Y.-H. Lee, and Y.-D. Choi, “A study on the floating bridge type horizontal axis tidal current turbine for energy independent islands in Korea,” Renewable Energy, vol. 112, pp. 35–43, Nov. 2017

DOI -https://doi.org/10.1016/j.renene.2017.05.025

• Hydraulic design and performance analysis on a small pump-turbine system for ocean renewable energy storage system
  
  

• S.-J. Kim, P. M. Singh, and Y.-D. Choi, “Study on structural safety of driving part of 15kW-Class HATCT model,” Han-guk marin enjinieoring hakoeji, vol. 41, no. 7, pp. 646–652, Sep. 2017

DOI -https://doi.org/10.5916/jkosme.2017.41.7.646

• Z. Chen, P. M. Singh, and Y.-D. Choi, “Structural Safety Evaluation of a Francis Hydro Turbine Model at Normal Operation Condition,” The KSFM Journal of Fluid Machinery, vol. 20, no. 4, pp. 12–18, Aug. 2017

DOI -https://doi.org/10.5293/kfma.2017.20.4.012

• P. M. Singh and Y.-D. Choi, “Initial Hydraulic Design and Performance Analysis of 300 MW-Class Pump-turbine Model,” The KSFM Journal of Fluid Machinery, vol. 20, no. 3, pp. 18–25, Jun. 2017

DOI -https://doi.org/10.5293/kfma.2017.20.3.018

• Y. Lee, K.-Y. Kim, Z. Chen, and Y.-D. Choi, “The Effect of Pump Intake Leaning Angle and Flow Rate on the Internal Flow of Pump Sump,” The KSFM Journal of Fluid Machinery, vol. 20, no. 1, pp. 74–80, Feb. 2017

DOI -https://doi.org/10.5293/kfma.2017.20.1.074

• J.-Y. Lee, S.-J. Kim, Z. Chen, P. M. Singh, and Y.-D. Choi, “Design and fundamental test on the cargo pump sump scaled model of tankers,” Han-guk marin enjinieoring hakoeji, vol. 41, no. 1, pp. 31–35, Jan. 2017

DOI -https://doi.org/10.5916/jkosme.2017.41.1.31

Year 2016

• P. M. Singh, Z. Chen, and Y.-D. Choi, “Numerical analysis for a proposed hybrid system with single HAWT, double HATCT and vertical oscillating wave energy converters on a single tower,” Journal of Mechanical Science and Technology, vol. 30, no. 10, pp. 4609–4619, Oct. 2016

DOI -https://doi.org/10.1007/s12206-016-0932-9

• V. Le, Z. Chen, and Y.-D. Choi, “A Study on CFD Analysis Methods using Francis-99 Workshop Model,” The KSFM Journal of Fluid Machinery, vol. 19, no. 5, pp. 20–27, Oct. 2016

DOI -https://doi.org/10.5293/kfma.2016.19.5.020

• Runner Design and Internal Flow Characteristics Analysis for an Ns=200 Francis Hydro Turbine Model
  
  

• P. M. Singh, Z. Chen, Y.-C. Hwang, M.-G. Kang, and Y.-D. Choi, “Performance characteristic investigation and stay vane effect on Ns100 inline francis turbine,” Han-guk marin enjinieoring hakoeji, vol. 40, no. 5, pp. 397–402, Jun. 2016

DOI -https://doi.org/10.5916/jkosme.2016.40.5.397

• Z. Chen, P. M. Singh, and Y.-D. Choi, “The effect of runner blade loading on the performance and internal flow of a Francis hydro turbine model,” Journal of Mechanical Science and Technology, vol. 30, no. 4, pp. 1617–1623, Apr. 2016

DOI -https://doi.org/10.1007/s12206-016-0317-0

• Z. Chen, P. Singh, and Y.-D. Choi, “Francis Turbine Blade Design on the Basis of Port Area and Loss Analysis,” Energies, vol. 9, no. 3, p. 164, Mar. 2016

DOI -https://doi.org/10.3390/en9030164

• A Study on the Effect of Port Area of Blade on the Performance of Francis Hydro Turbine
  
  

• P. M. Singh, Z. Chen, and Y.-D. Choi, “15kW-class wave energy converter floater design and structural analysis,” Journal of the Korean Society of Marine Engineering, vol. 40, no. 2, pp. 146–151, Feb. 2016

DOI -https://doi.org/10.5916/jkosme.2016.40.2.146

Year 2015

• Hydrodynamic performance of a pump-turbine model in the “S” characteristic region by CFD analysis
  
  

• Internal Flow Characteristics of a Francis Hydro Turbine Model by Internal Flow Passage Shapes

• Y. Lee, K.-Y. Kim, Z. Chen, and Y.-D. Choi, “The effect of suction pipe leaning angle on the internal flow of pump sump,” Han-guk marin enjinieoring hakoeji, vol. 39, no. 8, pp. 849–855, Oct. 2015

   DOI -https://doi.org/10.5916/jkosme.2015.39.8.849

• S.-J. Kim, P. M. Singh, and Y.-D. Choi, “Hydrofoil selection and design of a 50W class horizontal axis tidal current turbine model,” Journal of the Korean Society of Marine Engineering, vol. 39, no. 8, pp. 856–862, Oct. 2015

DOI -https://doi.org/10.5916/jkosme.2015.39.8.856

• Component structural analysis on 15kW class wave energy converter
  
  

• P. M. Singh, C. Chen, Z. Chen, and Y.-D. Choi, “Investigation into the Internal Flow Characteristics of a Pump-turbine Model,” The KSFM Journal of Fluid Machinery, vol. 18, no. 4, pp. 36–42, Aug. 2015

DOI -https://doi.org/10.5293/kfma.2015.18.4.036

• P. M. Singh, C. Chen, Z. Chen, and Y.-D. Choi, “Cavitation Characteristics of a Pump-turbine Model by CFD Analysis,” The KSFM Journal of Fluid Machinery, vol. 18, no. 4, pp. 49–55, Aug. 2015

DOI -https://doi.org/10.5293/kfma.2015.18.4.049

• Z. Chen and Y.-D. Choi, “Influence of air supply on the performance and internal flow characteristics of a cross flow turbine,” Renewable Energy, vol. 79, pp. 103–110, Jul. 2015

DOI -https://doi.org/10.1016/j.renene.2014.08.024

• Z. Chen, P. M. Singh, and Y.-D. Choi, “Structural Analysis on the Arm and Floater Structure of a Wave Energy Converter,” The KSFM Journal of Fluid Machinery, vol. 18, no. 3, pp. 5–11, Jun. 2015

DOI -https://doi.org/10.5293/kfma.2015.18.3.005

• C. Chen, P. M. Singh, and Y.-D. Choi, “Reliability Investigation of a Pump-Turbine System at Various Operating Conditions,” The KSFM Journal of Fluid Machinery, vol. 18, no. 3, pp. 46–52, Jun. 2015

DOI -https://doi.org/10.5293/kfma.2015.18.3.046

• C. Chen, P. M. Singh, M. Inagaki, and Y.-D. Choi, “A Feasibility Study on the Flow Passage Shape for an Inline Francis Hydro Turbine,” The KSFM Journal of Fluid Machinery, vol. 18, no. 2, pp. 5–13, Apr. 2015

DOI -https://doi.org/10.5293/kfma.2015.18.2.005

• Performance of an Open Ducted Type Very Low Head Cross-Flow Turbine
  
  

• Q. Wei, Z. Chen, P. M. Singh, and Y.-D. Choi, “Effect of Air Layer on the Performance of an Open Ducted Cross Flow Turbine,” The KSFM Journal of Fluid Machinery, vol. 18, no. 1, pp. 11–19, Feb. 2015

DOI -https://doi.org/10.5293/kfma.2015.18.1.011

• Design of a Pump-Turbine Based on the 3D Inverse Design Method

Year 2014

• C. Chen, M. Inagaki, and Y.-D. Choi, “A study on the performance and internal flow of inline Francis turbine,” Journal of the Korean Society of Marine Engineering, vol. 38, no. 10, pp. 1225–1231, Dec. 2014

DOI -https://doi.org/10.5916/jkosme.2014.38.10.1225

• Z. Chen, J.-C. Kim, M.-H. Im, and Y.-D. Choi, “Analysis on the performance and internal flow of a tubular type hydro turbine for vessel cooling system,” Han-guk marin enjinieoring hakoeji, vol. 38, no. 10, pp. 1244–1250, Dec. 2014

DOI -https://doi.org/10.5916/jkosme.2014.38.10.1244

• Q. Wei, Y.-C. Hwang, and Y.-D. Choi, “Internal Flow Analysis on an Open Ducted Cross Flow Turbine with Very Low Head,” The KSFM Journal of Fluid Machinery, vol. 17, no. 5, pp. 67–71, Oct. 2014

DOI -https://doi.org/10.5293/kfma.2014.17.5.067

• Z. Chen, P. M. Singh, and Y.-D. Choi, “Effect of Guide Nozzle Shape on the Performance Improvement of a Very Low Head Cross Flow Turbine,” The KSFM Journal of Fluid Machinery, vol. 17, no. 5, pp. 19–26, Oct. 2014

DOI - https://doi.org/10.5293/kfma.2014.17.5.019

• Internal Flow Characteristics of a Steelworks Sintering Cooler by the Duct Shape of Cooler Fan Outlet
  
  

• C. Chen and Y.-D. Choi, “Performance and Cavitation Analysis on Tidal Current Turbine for Low Water Level Channel,” The KSFM Journal of Fluid Machinery, vol. 17, no. 5, pp. 60–66, Oct. 2014

DOI -https://doi.org/10.5293/kfma.2014.17.5.060

• Performance Improvement of Very Low Head Cross Flow Turbine with Inlet Open Duct
  
  

• P. M. Singh and Y.-D. Choi, “Shape design and numerical analysis on a 1 MW tidal current turbine for the south-western coast of Korea,” Renewable Energy, vol. 68, pp. 485–493, Aug. 2014

DOI - https://doi.org/10.1016/j.renene.2014.02.032

• Patrick Mark Singh and Y. Choi, “Performance and Internal Flow Characteristics of an Axial Flow Pump for a Floating Type Water Treatment System,” 한국유체기계학회 논문집, vol. 17, no. 3, pp. 52–58, Jun. 2014

DOI -https://doi.org/10.5293/kfma.2014.17.3.052

Year 2013

• Y.-C. Hwang and Y.-D. Choi, “Construction of Marine Small Hydro Power Plant using Discharge Water of Fish Farm,” Journal of Fluid Machinery, vol. 16, no. 5, pp. 11–17, Oct. 2013

DOI -https://doi.org/10.5293/kfma.2013.16.5.011

• W.-S. Cho, Y.-D. Choi, and H.-S. Kim, “Fluid-structure interaction analysis on a low speed 200 W-class gyromill type vertical axis wind turbine rotor blade,” Han-guk marin enjinieoring hakoeji, vol. 37, no. 4, pp. 344–350, May 2013

DOI -https://doi.org/10.5916/jkosme.2013.37.4.344

• Q. Wei and Y.-D. Choi, “The influence of guide vane opening on the internal flow of a francis turbine,” Journal of the Korean Society of Marine Engineering, vol. 37, no. 3, pp. 274–281, May 2013

DOI -https://doi.org/10.5916/jkosme.2013.37.3.274

• S.-W. Son, P. M. Singh, and Y.-D. Choi, “Influence of guide vane shape on the performance and internal flow of a cross flow wind turbine,” Han-guk marin enjinieoring hakoeji, vol. 37, no. 2, pp. 163–169, Mar. 2013

DOI -https://doi.org/10.5916/jkosme.2013.37.2.163

• W.-S. Cho, H.-S. Kim, and Y.-D. Choi, “Shape design and flow analysis on a 200W-class gyromill type vertical axis wind turbine rotor blade,” Han-guk marin enjinieoring hakoeji, vol. 37, no. 2, pp. 170–177, Mar. 2013

DOI -https://doi.org/10.5916/jkosme.2013.37.2.170

Year 2012

• Y.-D. Choi and S.-W. Son, “CFD Analysis on the Performance and Internal Flow of a Micro Cross-Flow Hydro Turbine in the Range of Very Low Specific Speed,” Journal of Fluid Machinery, vol. 15, no. 6, pp. 25–30, Dec. 2012

DOI -https://doi.org/10.5293/kfma.2012.15.6.025

• Kiyoshi Kokubu, T. Kanemoto, S.-W. Son, and Y.-D. Choi, “Performance Improvement of a Micro Eco Cross-Flow Hydro Turbine,” Han-guk marin enjinieoring hakoeji, vol. 36, no. 7, pp. 902–909, Nov. 2012

DOI -https://doi.org/10.5916/jkosme.2012.36.7.902

• Internal Flow Characteristics in the Draft Tube of a Francis Turbine
  
  

• Design and Flow Analysis on the 1kW Class Horizontal Axis Wind Turbine Rotor Blade for Use in Southwest Islands Region
  
  

• Y.-D. Choi and S.-W. Son, “Shape Effect of Inlet Nozzle and Draft Tube on the Performance and Internal Flow of Cross-Flow Hydro Turbine,” Journal of the Korean Society of Marine Engineering, vol. 36, no. 3, pp. 351–357, May 2012

DOI -https://doi.org/10.5916/jkosme.2012.36.3.351

• J.-Y. Lee, I.-S. Kim, and Y.-D. Choi, “A Study on the Optimum Tandem Welding Torch Distance for the Reduction of CO2Shielding Gas Consumption,” Han-guk marin enjinieoring hakoeji, vol. 36, no. 2, pp. 294–301, Mar. 2012

DOI -https://doi.org/10.5916/jkosme.2012.36.2.294

• Y.-D. Choi, S.-W. Son, H.-C. Jang, and N.-J. Choi, “Design and Structure Analysis of a Tower Service Lift for Offshore Wind Power System,” Journal of the Korean Society of Marine Engineering, vol. 36, no. 1, pp. 101–108, Jan. 2012

DOI -https://doi.org/10.5916/jkosme.2012.36.1.101

Year 2011

• Y.-H. Hwang, Y.-H. Lee, and Y.-D. Choi, “Performance Measurement of a Tubular Type Turbine System for Small Hydropower by Field Test,” Journal of Fluid Machinery, vol. 14, no. 6, pp. 5–10, Dec. 2011

DOI -https://doi.org/10.5293/kfma..2011.14.6.005

• Y.-H. Hwang, Y.-H. Lee, and Y.-D. Choi, “Field Test for Performance Evaluation of a Tubular Turbine in Marine Small Hydro Power Plant,” Journal of Advanced Marine Engineering and Technology, vol. 35, no. 8, pp. 1070–1077, Nov. 2011

DOI -https://doi.org/10.5916/jkosme.2011.35.8.1070

• J.-O. Mo, B.-S. Kim, M.-E. Kim, Y.-D. Choi, and Y.-H. Lee, “Software Development for the Performance Evaluation and Blade Design of a Pitch-Controlled HAWT based on BEMT,” Journal of Fluid Machinery, vol. 14, no. 2, pp. 5–10, Apr. 2011

DOI -https://doi.org/10.5293/KFMA.2011.14.2.005

Year 2010

• Y.-D. Choi, C.-G. Kim, Y.-T. Kim, J.-I. Song, and Y.-H. Lee, “A performance study on a direct drive hydro turbine for wave energy converter,” Journal of Mechanical Science and Technology, vol. 24, no. 11, pp. 2197–2206, Nov. 2010

DOI -https://doi.org/10.1007/s12206-010-0903-5

• J. W. Lee, Y. D. Choi, Y. H. Lee, C. H. Yoon, and J. M. Park, “Internal Flow Analysis on a Mixed Flow Pump for Developing Marine Mineral Resources,” Journal of Fluid Machinery, vol. 13, no. 5, pp. 11–16, Oct. 2010

DOI -https://doi.org/10.5293/KFMA.2010.13.5.011

• Y.-D. Choi, B.-R. Shin, and Y.-H. Lee, “Air Layer Effect on the Performance Improvement of a Cross-Flow Hydro Turbine,” The KSFM Journal of Fluid Machinery, vol. 13, no. 4, pp. 37–43, Aug. 2010

DOI -https://doi.org/10.5293/KFMA.2010.13.4.037

• Performance and Internal Flow Analysis on the 80kW-Class Cross-Flow Hydro Turbine with the Variation of Effective Head
  
  

• J.-W. Choi, Y.-D. Choi, C.-G. Kim, and Y.-H. Lee, “Flow uniformity in a multi-intake pump sump model,” Journal of Mechanical Science and Technology, vol. 24, no. 7, pp. 1389–1400, Jul. 2010

DOI -https://doi.org/10.1007/s12206-010-0413-5

• Effect of J-Groove on the Suppression of Swirl Flow in a Conical Diffuser

Year 2009

• Numerical Analysis on the Flow Uniformity in a Pump Sump Model with Multi Pump Intake
  
  

• Y.-D. Choi, C.-G. Kim, and Y.-H. Lee, “Effect of wave conditions on the performance and internal flow of a direct drive turbine,” Journal of Mechanical Science and Technology, vol. 23, no. 6, pp. 1693–1701, Jun. 2009

DOI -https://doi.org/10.1007/s12206-009-0414-4