# Publications

Instability, Turbulence & Pattern Formation Group

Department of Aeronautics, Imperial College London, UK

## 2024

67. The origin of wall shear-stress fluctuations in wall-bounded turbulence

M. Lee & Y. Hwang, Sub judice

66. The state-space routes to spiral defect chaos in Rayleigh-Benard convection

C. H. Chan, M. Z. Hossain, S. J. Sherwin & Y. Hwang, Sub judice

65. The energetics and colour of linearised models in channel flow

J. J. Holford, M. Lee & Y. Hwang, J. Fluid Mech. To appear.

64. Dynamics of turbulent energy and dissipation in channel flow

Y. Le, Y. Hwang & J. C. Vassilicos, J. Fluid Mech. To appear.

63. Bifurcation and nonlinear dynamics of the follower force model for active filaments

B. Clarke, Y. Hwang & E. E. Keaveny, Phys. Rev. Fluids., 9. 073101, PDF.

This article is also chosen for Editors' Suggestion by Phys. Rev. Fluids.

62. Near-wall streamwise turbulence intensity as Re_tau goes to infinity

Y. Hwang, Phys. Rev. Fluids. 9. 044601, PDF.

61. Multi-scale invariant solutions in plane Couette flow: a reduced-order model approach

M. McCormack, A. V. G. Cavalieri & Y. Hwang, J. Fluid Mech. 983, A33, PDF.

60. A data-driven quasilinear approximation for turbulent channel flow

J. J. Holford, M. Lee & Y. Hwang, J. Fluid Mech. 980, A12, PDF.

## 2023

59. Generalised quaslinear approximations in homogeneous shear turbulence

Z. Luo, C. G. Hernandez & Y. Hwang, Phys. Rev. Fluids. 8, 064604, PDF.

58. Optimal white-noise stochastic forcing for linear models of turbulent channel flow

J. J. Holford, M. Lee & Y. Hwang, J. Fluid Mech. 961, A32, PDF.

57. Shape optimisation for a stochastic two-dimensional cylinder wake using ensemble variation

J. Lorente-Macias, Y. Bengana & Y. Hwang, J. Fluid Mech. 959, A7, PDF.

## 2022

56. The state space and travelling-wave solutions in two-scale wall-bounded turbulence

P. Doohan, Y. Bengana, Q. Yang, A. P. Willis & Y. Hwang, J. Fluid Mech. 947, A41, PDF

55. Exact coherent states in plane Couette flow under spanwise wall oscillation

Y. Bengana, Q. Yang, T. Guohua & Y. Hwang, J. Fluid Mech., 947, A2, PDF

54. Generalised quasilinear approximations of turbulent channel flow: Part 2. Spanwise scale interactions

C. G. Hernandez, Q. Yang & Y. Hwang, J. Fluid Mech., 944, A34, PDF

53. A driving mechanism of near-wall turbulence subject to adverse pressure gradient

Y. Jiao, S. I. Chernyshenko & Y. Hwang, J. Fluid Mech., 941, A37, PDF

52. Synchronized states of hydrodynamically coupled filaments and their stability

S. Maretvadakethope, Y. Hwang & E. E. Keaveny, Phys. Rev. Fluids., 7, 053101, PDF

This article is selected as 'editors' suggestion'.

51. A sparese optimal closure for a reduced-order model of wall-bounded turbulence

Z. C. Khoo, C. H. Chan & Y. Hwang, J. Fluid Mech., 939, A11, PDF

50. Generalised quasilinear approximations of turbulent channel flow: Part 1. Streamwise nonlinear energy transfer

C. G. Hernandez, Q. Yang & Y. Hwang, J. Fluid Mech., 936, A33, PDF

49. A local approximation model for macro-scale transport of biased active Brownian particles in a flowing suspension

L. Fung, R. N. Bearon, Y. Hwang, J. Fluid Mech., 935, A24, PDF

48. The logarithmic variance of streamwise velocity and k−1 conundrum in wall turbulence

Y. Hwang, N. Hutchins & I. Marusic, J. Fluid Mech., 933, A8, PDF

47. Direct measurement of the viscoelectric effect in water

D. Jin, Y. Hwang, L. Chai, N. Kampf & J. Klein, Proc. Nat'l Acad. Sci. USA, 119(1), e2113690119, PDF

## 2021

46. Instabilities and sensitivities in a flow over a rotationally flexible cylinder with a rigid splitter plate

R. Basso, Y. Hwang, G. Assi, S. J. Sherwin, J. Fluid Mech., 928, A24, PDF

45. Minimal multi-scale dynamics of near-wall turbulence

P. Doohan, A. P. Willis & Y. Hwang, J. Fluid Mech., 913, A8, PDF

44. Scaling of turbulence intensities up to Re_tau=10^6 with a resolvent-based quasilinear approximation

N. Skouloudis & Y. Hwang, Phys. Rev. Fluids, 6, 034602, PDF

43. Orr mechanism in transition of parallel shear flow

Y. Jiao, Y. Hwang & S. I. Chernyshenko, Phys. Rev Fluids, 6, 023802, PDF

## 2020

42. Spectral energetics of quasilinear approximation in uniform shear turbulence

C. G. Hernandez & Y. Hwang, J. Fluid Mech., 904, A11, PDF

41. The mean logarithm emerges with self-similar energy balance

Y. Hwang & M. Lee, J. Fluid Mech., 903 R6, PDF

40. A sequence of transcritical bifurcations in a suspension of gyrotactic microswimmers in vertical pipe

L. Fung, & Y. Hwang, 2020, J. Fluid Mech., 902, R2. PDF

39. Bifurcation and stability of downflowing gyrotactic microorganism suspensions in a vertical pipe

L. Fung, R. N. Bearon, & Y. Hwang, J. Fluid Mech., 902, A26. PDF

38. Linear instability of tilted parallel shear flow in a strongly stratified and viscous medium

L. Fung & Y. Hwang, JMST. Adv. 2(2), p37 PDF

37. Attached eddy model revisited using a minimal quasi-linear approximation

Y. Hwang & B. Eckhardt, J. Fluid Mech., 894, A23. PDF

36. Finding extremal periodic orbits with polynomial optimization, with application to a nine-mode model of shear flow

M. Lakshimi, G. Fantuzzi, J. D. Fernandez-Caballero, Y. Hwang & S. I. Chernyshenko, SIAM J. App. Dyn. Sys. 19(2), p763. PDF

## 2019

35. Shear stress-driven flow: the state space of near-wall turbulence as Re_tau goes to infinity

P. Doohan, A. P. Willis & Y. Hwang, J. Fluid Mech., 874, p606. PDF

34. Exact coherent states of attached eddies in channel flow

Q. Yang, A. P. Willis & Y. Hwang, J. Fluid Mech., 869, p1029. PDF

33. The instability of gyrotactically-trapped cell layers,

S. Maretvadakethope, E. E. Keaveny & Y. Hwang, J. Fluid Mech., 868 R5. PDF

32. Phase-space dynamics of opposition controlin wall-bounded turbulent flows

J. I. Ibrahim, Q. Yang, P. Doohan & Y. Hwang,, J. Fluid Mech., 861, p29. PDF

31. Quasi-linear approximation of exact coherent states in parallel shear flows

M. Pausch, Q. Yang, Y. Hwang & B. Eckhardt, Fluid dynamics research, 51, 011402. PDF

Special issue in Fluid Dynamics of Near-wall Turbulence.

## 2018

30. Scale interactions and spectral energy transfer in turbulent channel flow

M. Cho, Y. Hwang & H. Choi, J. Fluid Mech., 854, p474. PDF

29. Evaporation-driven convection in non-motile bacterial suspensions

J. Dunstan, K. J. Lee, S. Park, Y. Hwang & R. E. Goldstein, Phys. Rev. Fluids, 3, 123102. PDF

28. Energy production and self-sustained turbulence at the Kolmogorov microscale in Couette flow

Q. Yang, A. P. Willis & Y. Hwang, J. Fluid Mech., 834, p531. PDF

## 2017

27. Streak instability in turbulent channel flow: the seeding mechanism of large-scale motions

M. de Giovanetti, H. J. Sung & Y. Hwang, J. Fluid Mech., 832, p483.

26. ‘Streak instability in near-wall turbulence revisited

A. Cassinelli, M. de Giovanetti, & Y. Hwang, J. Turbulence 18(5), p443

Invited for special issue to celebrate 70th birthday of Prof. Javier Jimenez

25. Self-sustaining process at all the scale in wall-bounded turbulent shear flows

C. Cossu & Y. Hwang, Phil. Trans. R. Soc. Lond., 375, 20160088

Invited for special issue on ‘Toward the development of high-fidelity models of wall-turbulence at large Reynolds numbers

## 2016

24. Skin-friction generation by attached eddies in turbulent channel flow

M. de Giovanetti, Y. Hwang & H. Choi, J. Fluid Mech., 808, p511. PDF

23. Mesolayer of attached eddies in turbulent channel flow

Y. Hwang, Phys. Rev. Fluids, 1, 064401. PDF

22. Invariant solutions of minimal large-scale structures in turbulent channel flow

Y. Hwang, A. P. Willis & C. Cossu, J. Fluid Mech., 801, R1. PDF

21. Self-sustaining process of minimal attached eddies in turbulent channel flow

Y. Hwang & Y. Bengana, J. Fluid Mech., 795, p708. PDF

20. Model of cellular mechanotransduction via actin stress fibre networks

C. L. M. Gouget, Y. Hwang, A. I. Barakat, Biomech. Model. Mechanobiol., 15(2), p331. PDF

## 2015

19. On the self-sustained nature of large-scale motions in tubulent Couette flow

S. Rawat, C. Cossu, Y. Hwang & F. Rincon, J. Fluid Mech., 782, p515. PDF

18. Characterizing cell adhesion using micropipette aspiration

B. Hogan, A. Babataheri, Y. Hwang, A. I. Barakat & J. Husson, Biophys. J., 109(2), p209. PDF

17. Statistical structure of self-sustaining attached eddies in turbulent channel flow

Y. Hwang, J. Fluid Mech., 767, p254. PDF

16. Structural sensitivities of soft and steep nonlinear global modes in spatially developing media’,

Y. Hwang, Eur. J. Mech. - B/Fluids, 49, Part B, p322. PDF

Invited for special issue on ‘Trends in Open Shear Flow Instability'

## 2014

15. Stability of downflowing gyrotactic microorganism suspensions in a two-dimensional vertical channel

Y. Hwang, & T. J. Pedley, J. Fluid Mech., 749, p750. PDF

14. Bioconvection under uniform shear: linear stability analysis

Y. Hwang & T. J. Pedley, J. Fluid. Mech., 738, p522. PDF

The article is featured by a ‘Focus on Fluids’ article. See ‘Swimming in shear’ by D. Saintillan, J. Fluid. Mech., 744, p1. PDF

13. Intracellular regulation of signaling cascades: how location makes difference

Y. Hwang, P. Kumar, & A. I. Barakat, J. Math. Biol., 69(1), p213-42. PDF

## 2005-2013

12. Stabilization of absolute instability in spanwise wavy two-dimensional wakes

Y. Hwang, J. Kim, & H. Choi, 2013, J. Fluid. Mech., 727, p346. PDF

11. Near-wall turbulent fluctuations in the absence of wide outer motions

Y. Hwang, J. Fluid Mech., 2013, 723, p264. PDF

10. The mechanism of rapid long-distance signal activation in cellular mechanotransduction

Y. Hwang, C. L. M. Gouget, & A. I. Barakat, 2012, Comm. Int. Biol., 5(6), p1. PDF

Invited article from the journal editor

9. Dynamics of mechanical signal transmission through prestressed stress fibers

Y. Hwang & A. I. Barakat, 2012, PLoS ONE, 7(4), e35343. PDF

8. Self-sustained processes in the logarithmic layer of turbulent channel flows

Y. Hwang & C. Cossu, 2011 Phys. Fluids, 63, 061702. PDF

7. On the stability of large-scale streaks in turbulent Poiseulle and Couette flows

J. Park, Y. Hwang & C. Cossu, 2011, C. R. Mecanique, 339, p1. PDF

6. Linear non-normal energy amplification of harmonic and stochastic forcing in the turbulent channel flow

Y. Hwang & C. Cossu, 2010, J. Fluid Mech., 664, p51. PDF

5. Optimally amplified large-scale streaks and drag reduction in the turbulent pipe flow

A. P. Willis, Y. Hwang & C. Cossu, 2010, Phys. Rev. E, 82, 036321. PDF

Also, Kaleidoscope Image in September of 2010.

4. Self-sustained process at large scale in turbulent channel flow

Y. Hwang & C. Cossu, 2010, Phys. Rev. Lett., 105, 044505. PDF

3. Amplification of coherent streaks in the turbulent Couette flow: an input-output analysis at low Reynolds numbers

Y. Hwang & C. Cossu, 2010, J. Fluid Mech., 643, p333. PDF

2. Sensitivity of global instability of spatially developing flow in weakly and fully nonlinear regimes

Y. Hwang & H. Choi, 2008, Phys. Fluids, 20, 071703. PDF

1. Control of absolute instability by basic-flow modification in a parallel wake at low Reynolds number

Y. Hwang & H. Choi, 2006, J. Fluid Mech., 560, p465. PDF