# Publications

**Instability, Turbulence & Pattern formation Group**

Department of Aeronautics, Imperial College London, UK

## 2022

**5****9****. ****Generalised quaslinear approximations in homogeneous shear turbulence**

Z. Luo, C. G. Hernandez & Y. Hwang, Sub judice

**5****8****. ****Optimal white-noise stochastic forcing for linear models of turbulent channel flow**

J. Holford, M. K. Lee & Y. Hwang, Sub judice

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

J. Lorente-Macias, Y. Bengana & Y. Hwang, Sub judice

**5****6.**** ****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. To appear.

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

Y. Bengana, Q. Yang, T. Guohua & Y. Hwang, J. Fluid Mech. To appear.

**5****4****. 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

**5****3****. 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

**5****2****. 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'.

**5****1****. 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

**5****0****. 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

**4****6****. 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