Watch the latest #KITP Blackboard Lunch talk by Karen Daniels (NC State) — Rigidity (or not) on the Earth's surface and beyond

Our new paper, led by @ramsudhirsharma.bsky.social (with Alexandre Leonelli, Kevin Zhao, Eckart Meiburg), has been published in @apsphysics.bsky.social PRL. We revisit hourglasses/silos and ask what really sets the discharge rate. See more here: doi.org/10.1103/3g2f-nslz

Welcome to the Soft Earth Geophysics program at KITP! January 5 - March 26, 2026 Learn more: buff.ly/b5WkU3A #softearth26

Excited to share our new preprint on the discharge of granular materials from a silo. Led by @ramsudhirsharma.bsky.social , we went after a simple question: What is the flow rate through the opening? The answer turns out to be "simple" and quite general. See more here: arxiv.org/abs/2509.14415 [1/4]

We have a double-header out this week: two papers examining how the stress-force-fabric relation manifests in both annular shear (PRL doi.org/10.1103/gp8t...) and more varied loading conditions (PRE doi.org/10.1103/rv25...). The anisotropies in the contact forces set the response to loading, (1/3)

I'm incredibly proud of PhD student Nacere Mohamed Samassi for submitting her first ever paper, as well as the first experimental paper from the DRIP lab! Check out the preprint here: eartharxiv.org/repository/v...

I had the pleasure of being a #Fulbright scholar in @granmech.bsky.social 's lab at IISc Bangalore last year, where grad student Abrar Naseer is doing photoelastic force measurements on bonded pairs of particles (my lab just does single ones!) Here's the first preprint: arxiv.org/abs/2507.19214

Our new study, led by Philippe Gondret and Cyprien Morize (FAST Laboratory), part of Wladimir Sarlin's PhD, has just been published in Journal of Fluid Mechanics. It explores how impulsive motions generate waves. doi.org/10.1017/jfm.... @univparissaclay.bsky.social @univofmaryland.bsky.social

Excited to present some recent work at march meeting, where we revisit the constant mass flux of particles through apertures! A simple framework, lots of experiments and some ideas on packing. Would love for you to stop by session MAR-M62 on Wed afternoon (3/19) :) #APSSummit25

Lineup from our group at the @APS Global Summit: We will be covering studies on fluids, grains, drops, and suspensions! More details below.

Excited to share our new paper in @pnas.org doi.org/10.1073/pnas...! Ice cubes often appear cloudy because, as water freezes, air bubbles get trapped and scatter light. But how does freezing rate affect the shape of the bubbles?

It feels crappy to "brag" about a new paper while science is being dismantled. But in the spirit of #standupforscience i guess it's good for us to remember what we're doing this for.

Stickiness matters! From powder handling to geophysical flows, cohesion in granular material plays a crucial role. We review in Soft Matter @roysocchem.bsky.social experimental approaches to create and control inter-particle adhesion pubs.rsc.org/en/content/a...

Science is resistance, and inclusion is warfare. We need to understand, organize, and operate on these principles now. 🧪

New preprint out on self-propelling melting ice blocks arxiv.org/abs/2412.16010. This work was led by Michael Berhanu and it was a pleasure to be a part off along with AmitDawadi at ClarkUniversity, and Martin Chaigne, and Jerome Jovet at University Paris Cite.

Hot off the press A super fun collaboration and paper. All you ever wanted about the squirting cucumber but never dared to ask. www.pnas.org/doi/10.1073/...

If you are at the @apsphysics.bsky.social DFD meeting in SLC come join this morning to hear about a sticky problem: the clogging of suspensions! I will be giving an invited talk at 11:05 am in Hall 3, trying to share the work done by our group in this topic over the past few years

If you are into granular material, piles and how granular jets fall and impact on a surface, @ramsudhirsharma.bsky.social got you covered on Sunday morning!

Here is the lineup of talks from our group and collaborators for the @apsphysics.bsky.social DFD Meeting this year. More fluid dynamics, granular media, suspensions, and clogging coming!

Our video entry for the 2024 Gallery of Fluid Motion @apsphysics.bsky.social is now online! Some variations on Harold “Doc” Edgerton’s drop impact experiments youtu.be/xIITzWnnwYI?...