About Me

My research expertise is in experimental fluid mechanics regarding the liquid-gas / fluid-solid interaction through experiments together with theoretical approaches and numerical tools. Using optimizied experimental design and multidisciplinary collaboration, I have contributed a variety of research fields such as spray process, droplet production, flow measurement technique, biology, collective behavior, surgical devices, disease transmission, digital twin as well as fundamental fluid mechanics.

I am a postdoctor at Ajou University working with Professor Daeshik Kang, Professor Jae-Sung Koh, and Professor Seungyong Han. I earned my Ph.D. degree in the department of mechanical engineering at Seoul National University in 2022 under the supervision of professor Hyungmin Park. In the same department, I received M.S., and B.S. degrees in 2018, and 2015, respectively. I received the best Ph.D. thesis award at Seoul National Univerity.

[Updates]

2022. 11. 20. I visited the 75th APS meeting held in Indianapolis.
2022. 09. 05. Our paper on flexible nozzle has been accepted in Journal of Fluid Mechanics.
2022. 09. 01. I entered Multiscale Bio-inspired Technology Laboratory at Ajou University (South Korea) as a postdoctoral fellow
2022. 08. 29. I received the best Ph.D. Thesis award from the Department of Mechanical Engineering, Seoul National University.
2022. 08. 08. I received a fully funded domestic postdoctoral scholarship from the National Research Foundation of Korea (Sep. 2022-Oct. 2023).
2022. 07. 13. Our paper on CNN-based bubble velocimetry has been accepted in Scientific Reports.
2022. 06. 08. I successfully defended my Ph.D.!
2022. 05. 13. Our paper on liquid atomization has been accepted in Journal of Fluid Mechanics.

Research Areas

  • Liquid-gas Interaction

    Understanding dominating interface dynamics during mass/momentum transfer between phases using precise measurements.

  • Fluid-solid Interaction

    Elucidating the coupling dynamics between solid and fluid where a large amout of momentum is exchanged between them.

Publications

Under Review/In Preparation

  • "Power amplification mechanism of the squid-inspired propulsion"
    Daehyun Choi*, Minho Kim*, Jieun Park*, Seungyong Han, Jaesung Koh & Daeshik Kang (*equally contributed)
    Manuscript in preparation (Science Robotics)

  • "Enhanced impulse and entrainments of the pulsed circular jet by flexible nozzle"
    Daehyun Choi & Hyungmin Park
    Manuscript in preparation (Journal of Fluid Mechanics)



Accepted

  • "Flow-structure interaction of the starting jet through the flexible circular nozzle"
    Daehyun Choi & Hyungmin Park
    Journal of Fluid Mechanics, 949, A39 (2022)

  • "Bubble velocimetry using the conventional and CNN-based optical flow algorithms"
    Daehyun Choi*, Hyunseok Kim* & Hyungmin Park (*equally contributed)
    Scientific Report, 12, 11879 (2022)

  • "Analysis of the liquid column atomization by annular dual-nozzle gas jet flow"
    Daehyun Choi, Jungwon Byun, & Hyungmin Park
    Journal of Fluid Mechanics, 943, A25 (2022)

  • "Electroconvective circulating flows by asymmetric coulombic force distribution in multiscale porous membrane"
    Dokeun Lee, Daehyun Choi, Hyungmin Park & Sungjae Kim
    Journal of Membrane Science, 636, 119286 (2021)

  • "Flow around in-line sphere array at moderate Reynolds number"
    Daehyun Choi & Hyungmin Park
    Physics of Fluids, 30, 097104 (2018), selected as a Editor's Pick

About

Education

  • 2017 - 2022    Ph.D. Mechanical Engineering
    Seoul National Univerity (South Korea)
  • 2015 - 2017    M.S. Mechanical Engineering
    Seoul National Univerity (South Korea)
  • 2011 - 2015    B.S. Mechanical Engineering
    Seoul National Univerity (South Korea)

Work Experience

  • 2022 - present    Postdoctoral Fellow
    Ajou Univerity (South Korea)
  • 2022 - present    Assistant Researcher
    Seoul National Univerity (South Korea)

Service

  • 2018 - 2020 Laboratory Leader (MFFV lab, Seoul National Unveristy)
  • 2018 - 2021 Technical Research Personnel at Republic of Korea Army (ROKA)
  • 2014 - 2015 Division head of club association at Seoul National University
  • 2013 - 2014 Leader of CFD team for Edison Challenge
  • 2013 - 2014 Club leader at Seoul National University

Grants & Awards

  • 2022     Best Thesis award in the department of mechanical engineering at Seoul National University
  • 2022 -     Fully funded postdoctoral scholarship from the National Research Foundation of Korea
  • 2015 -    Merit-based scholarship (BK+21) for graduate students from Seoul Nation University
  • 2014     The 1st Prize in the university competition of Korea Computational Fluid Dynamics (EDISON Challenge)
    “A new design research on pantograph panhead having a hole characteristic”
  • 2011 -    Presidential scholarship for undergraduate students (Merit-based scholarship)

Academic References

  • Professor Daeshik Kang    (Postdoc mentor)
    Depemartment of Mechanical Engineering
    Ajou Univerity, South Korea
    Email: dskang@ajou.ac.kr
  • Professor Kwangsuk Lee    (co-worker)
    Department of Urology
    Yonsei University College of Medicine, South Korea
    Email: calmenow@yuhs.ac
  • Professor Haecheon Choi    (Thesis committee chair)
    Depemartment of Mechanical Engineering
    Seoul National Univerity, South Korea
    Email: choi@snu.ac.kr
  • Professor Hyungmin Park    (Thesis advisor)
    Depemartment of Mechanical Engineering
    Seoul National Univerity, South Korea
    Email: hminpark@snu.ac.kr