Physics of Fluids @ UTwente

🎉 Congratulations to Dr. Jochem Meijer for winning the KIVI Hoogendoorn Fluid Mechanics Award 2024! His thesis "Particles, drops, and bubbles in gradient fields" was recognized as the best PhD thesis of 2023-24. Supervised by @detleflohse.bsky.social 👏 #FluidMechanics #PhD​​​​​​​​​​​​​​​​

Rotation and translation of a long curved fiber

🚨 new paper alert 🚨
1/3 🌊 Measuring experimentally the dispersion of #microplastic #fibres in turbulent flows is incredibly challenging, due to their small size. However, experiments are key to develop reliable models to predict the fate of microplastics in #environmental #flows.

Simulation and Modeling of Convective Mixing of Carbon Dioxide in Geological Formations Convective mixing of carbon dioxide in geological formations follows different regimes During a regime in which the flux is constant, mixing in 3D simulations is 13% larger than in 2D simulations...

🧵8/8 The manuscript and the data are freely available for download.

📕 Paper agupubs.onlinelibrary.wiley.com/doi/10.1029/...

💻 Data figshare.com/articles/dat...

#PhysicsOfFluids #physics #engineering #OpenAccess #OpenSource #UniversityTwente #TUWien

Simulation and Modeling of Convective Mixing of Carbon Dioxide in Geological Formations Convective mixing of carbon dioxide in geological formations follows different regimes During a regime in which the flux is constant, mixing in 3D simulations is 13% larger than in 2D simulations...

🧵1/8 To mitigate the catastrophic effects of #globalwarming, we will have to capture from the atmosphere billions of tons of #carbondioxide, and store it underground.

And there is no doubt about that.

But what will it happen in the subsurface?

agupubs.onlinelibrary.wiley.com/doi/10.1029/...

"Living Histories". Detlef Lohse | #TheLivingHistoriesSeries The Living Histories series: https://tinyurl.com/TheLHSeries Very brief "trajectory talks" on personal histories leading to the becoming of biological physicists / quantitative biologists / neuroscientists / mathematicians/ complexity scientists. Series concept: Srividya Iyer-Biswas Series organizers: Srividya Iyer-Biswas, Tapa Bhattacharjee, Jasmine Nirody, and Charlie Wright Series website: https://tinyurl.com/TheLHSeries

So inspiring to hear my mentor, Detlef Lohse (@poftwente.bsky.social), share his scientific journey in this @thelhseries.bsky.social! His thoughts on curiosity, mentorship, and the "puzzle solving" joy of science resonate deeply. A must-watch! Always so much to learn. bit.ly/3DXBixh

🧵3/6 Here we provide an efficient and parallel #open #source code to analyze these problems. We extend the simulation capabilities of the Advanced Finite Difference solver AFiD, developed at @poftwente.bsky.social, and we focus on the simulation of strongly convective Darcy flows.

Evolution of a Rayleigh-Taylor instability in a porous - 3D visualization of the concentration field.

🚨 PAPER ALERT 🚨 Comput. Phys. Commun.
🧵1/6 We present the code AFiD-Darcy, designed for massively parallel numerical simulations of convective porous media flows. Thanks to Guru Sreevanshu Yerragolam, Detlef Lohse and Roberto Verzicco for the great collaboration at @poftwente.bsky.social

This is our first paper with a JFM Notebook—an excellent initiative by J. Fluid Mech. to host interactive code and data. It greatly enhances reproducibility and transparency in fluid dynamics research—a commendable step forward.
cocalc.com/Cambridge/S0...

[SM1]: The role of viscosity on drop impact forces The case shown here is We = 40, Oh = 0.0025. Paper: https://doi.org/10.48550/arXiv.2311.03012 Full description: Comparison of the drop impact force $F(t)$ obtained from experiments and simulations for the three typical cases with impact velocity $V_0 = 1.2\,\si{\meter}/\si{\second}, 0.97\,\si{\meter}/\si{\second}, 0.96\,\si{\meter}/\si{\second}$, diameter $D_0 = 2.05\,\si{\milli\meter}, 2.52\,\si{\milli\meter}, 2.54\,\si{\milli\meter}$, surface tension $\gamma = 72\,\si{\milli\newton}/\si{\meter}, 61\,\si{\milli\newton}/\si{\meter}, 61\,\si{\milli\newton}/\si{\meter}$ and viscosity $\eta_d = 1\,\si{\milli\pascal\second}, 25.3\,\si{\milli\pascal\second}, 80.2\,\si{\milli\pascal\second}$. These parameter give $Oh = 0.0025, 0.06, 0.2$ and $We = 40$. For the three cases, the two peak amplitudes, $F_1/(\rho_dV_0^2D_0^2) \approx$ 0.82, 0.92, 0.99 at $t_1 \approx 0.03\sqrt{\rho_dD_0^3/\gamma}$ and $F_2/(\rho_dV_0^2D_0^2) \approx$ 0.37, 0.337, 0.1 at $t_2 \approx 0.42\sqrt{\rho_dD_0^3/\gamma}$, characterize the inertial shock from impact and the Worthington jet before takeoff, respectively. The drop reaches the maximum spreading at $t_{\text{max}}$ when it momentarily stops and retracts until $0.8\sqrt{\rho_dD_0^3/\gamma}$ when the drop takes off ($F = 0$). The black and gray dashed lines in panel (a) mark $F = 0$ and the resolution $F = 0.5\,\si{\milli\newton}$ of our piezoelectric force transducer, respectively. We stress the excellent agreement between experiments and simulations without any free parameters. The left part of each numerical snapshot shows (on a $\log_{10}$ scale) the dimensionless local viscous dissipation function $\tilde{\xi}_\eta \equiv \xi_\eta D_0/\left(\rho_dV_0^3\right) = 2Oh\left(\boldsymbol{\tilde{\mathcal{D}}:\tilde{\mathcal{D}}}\right)$, where $\boldsymbol{\mathcal{D}}$ is the symmetric part of the velocity gradient tensor, and the right part the velocity field magnitude normalized with the impact velocity.

📢 Checkout our work in J. Fluid Mech. (bit.ly/3QuxMgE) on how viscosity alters drop-impact forces. Together with Bin Zhang, Cunjing Lv, & Detlef Lohse. The first and second force peaks emerge from distinct flow mechanisms—one at impact, another at take-off. @poftwente.bsky.social bit.ly/4gUvD8P

Congratulations, Giulia Piumini, for successfully defending her thesis: Fluid structure interaction of turbulent flows with complex-shape bodies. tinyurl.com/26dd34j2.
Congratulations also to the promotion team: Detlef Lohse and Roberto Verzicco. #FluidDynamics #particles

⚡To clog or not to clog: @alvaromarin.bsky.social and Mathieu Souzy summarize how particle bridging drives clogging in noncohesive suspensions—from arch formation at constrictions to fluid-induced stabilization and destabilization. @utwente.bsky.social @poftwente.bsky.social #clogging #fluiddynamics

Our Annual Review of Fluid Mechanics is now accessible for free! find out how to make a jellyfish smoothy 🪼, or how to cross a river without a bridge 🪵... thanks @annualreviews.bsky.social for make this volume open!

www.annualreviews.org/content/jour...

Delighted that our research on evaporating binary drops by Pim Dekker, Christian Diddens, and Detlef Lohse, studying non-monotonic surface tension and symmetry-breaking dynamics, was one of the the 2024 APS-DFD Milton van Dyke award winners.
arXiv: tinyurl.com/2c7v7lzc.
Video: tinyurl.com/2crhbjtp

🔊 Just wrapped up an insightful seminar on microscale #Acoustofluidics with Henrik Bruus from Technical University of Denmark! Exploring the shift from traditional glass/silicon devices to innovative polymer-based solutions. @utwente.bsky.social

follow the work here: doi.org/10.1017/jfm....

Devaraj van der Meer from @poftwente.bsky.social @utwente.bsky.social explores the impact of boiling liquids on solid surfaces. Condensing vapor can create pressures far exceeding those in water-air scenarios. Fascinating implications for industrial applications! 🌊 #FluidDynamics #Physics #APSDFD24