Biofluiddynamics    Drops    Bubbles    Elastocapillarity     Nanofabrication





How do insects jump on earth and water?

We study how aquatic insects, such as water striders, can jump on water without sinking. Along with the theoretical approach, we observe the jumping behavior of cylinders and spheres on water. We are currently extending our interests to the jumps of terrestrial insects.

Related publications
1. D. Vella, D.-G. Lee, and H.-Y. Kim, “Sinking of a horizontal cylinder,
Langmuir, 22, 2972-2974 (2006)
2. D. Vella, D.-G. Lee, and H.-Y. Kim, “
The load supported by small floating objects, Langmuir, 22, 5979-5981 (2006)
3. D.-G. Lee and H.-Y. Kim, “Impact of a superhydrophobic sphere onto water,” Langmuir, 24, 142-145 (2008)
4. D.-G. Lee and H.-Y. Kim, “The role of superhydrophobicity in the adhesion of a floating cylinder,” Journal of Fluid Mechanics, 624, 23-32 (2009)

5. D.-G. Lee and H.-Y. Kim, “Sinking of small sphere at low Reynolds number through interface,” Physics of Fluids, 23, 072104 (2011)
6. E. Yang and H.-Y. Kim,
“Jumping hoops,” American Journal of Physics, 80, 19-23 (2012)

7. J.-S. Koh, E. Yang, G.-P. Jung, J. H. Son, S.-I. Lee, P. G. Janblonski, R. J. Wood, H.-Y. Kim, and K.-J. Cho, “Jumping on water: Surface tension-dominated jumping of water striders and robotic insects,” Science 349, 517-521 (2015)

8. E. Yang, J. H. Son, S. Lee, P. G. Jablonski and H.-Y. Kim, “Water striders adjust leg movement speed to optimize takeoff velocity for their morphology,” Nature Communications 7, 13698 (2016)


Cover of the January issue of  American Journal of Physics (2012): Ref. 6


Flapping foils and fluttering flags

We study this interesting problem of flow-structure interaction with a wind-tunnel and a high-speed camera. This has implications on how animals fly or swim as well as industrial processes such as paper production.

Related publications
1. Y.-J. Park, U. Jeong, J. Lee, S. R. Kwon, H.-Y. Kim, and K.-J. Cho,
“Kinematic condition for maximizing the thrust of a robotic fish using a compliant caudal fin,” IEEE Transactions on Robotics, 28, 1216-1227 (2012)
2. J. Lee, Y.-J. Park, U. Jeong, K.-J. Cho, and H.-Y. Kim, “Wake and thrust of an angularly reciprocating plate,” Journal of Fluid Mechanics, 720, 545-557 (2013)

3. J. Bae, J. Lee, S. M. Kim, J. Ha, B.-S. Lee, Y. J. Park, C. Choong, J.-B. Kim, Z. L. Wang, H.-Y. Kim, J.-J. Park & U.-I. Chung, “Flutter-driven triboelectrification for harvesting wind energy,” Nature Communications 5, 4929 (2014)

4. J. Lee, H. Choi, and H.-Y. Kim, “A scaling law for the lift of hovering insects,” Journal of Fluid Mechanics 782, 479-490 (2015)

5. J. Lee, Y.-J. Park, K.-J. Cho, D. Kim, and H.-Y. Kim, “Hydrodynamic advantages of a low aspect-ratio flapping foil,” Journal of Fluids and Structures 71, 70-77 (2017)


Botanical movements

Related publicationsW
1. W. Jung, W. Kim, and H.-Y. Kim, “Self-burial mechanics of hygroscopically responsive awns,”
Integrative and Comparative Biology 54, 1034–1042 (2014)

2. W. Jung, S. M. Choi, W. Kim, and H.-Y. Kim, “Reduction of granular drag inspired by self-burrowing rotary seeds,” Physics of Fluids 29, 041702 (2017)


Optimal structures in nature

Related publications
1. K. Park, W. Kim and, H.-Y. Kim, “Optimal lamellar arrangement in fish gills,”
Proceedings of the National Academy of Sciences of the United States of America 111, 8067-8070 (2014)





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Micro Fluid Mechanics Laboratory

Department of Mechanical and Aerospace Engineering

Seoul National University, Korea