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Abhinendra Singh

@asingh-case.bsky.social

Soft Matter Physicist. Enthusiastic about numerical simulations. Interested amorphous materials, rheology, complex fluids, simulations, dad. he/him

Posts Replies Media

Abhinendra Singh @asingh-case.bsky.social · 29/10/2025

Excited to present “Shear-thickening in dense suspensions: Beyond mean-field models and steady-state response” at the @cornellupress.bsky.social Soft Matter Seminar Series. Honored to be listed among researchers I’ve long admired and learned so much from. #everythingflows #networksrcool

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Abhinendra Singh @asingh-case.bsky.social · 09/09/2025

FINAL REVEAL: Viscosity collapses beautifully when plotted against the number of 3rd-order loops. This collapse is universal — independent of stress, volume fraction, or even friction. We even find a power law behavior, signifying max. n3 at jamming.

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Abhinendra Singh @asingh-case.bsky.social · 09/09/2025

This is where things got interesting: The mean-field golden standard models suggest viscosity to be driven by the frictional number of contacts. To test this, we performed extensive simulations changing packing fraction, stress, and sliding friction. Spoiler: NO collapse

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Abhinendra Singh @asingh-case.bsky.social · 09/09/2025

Earlier work hinted that DST onset ≈ loop formation. Here, we visualized them directly. Sure enough, loops first appear right as suspensions undergo DST. We tracked how 3rd–8th order loops evolve with stress, packing fraction, and friction.

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Abhinendra Singh @asingh-case.bsky.social · 09/09/2025

To answer the question: "What is the motif that underpins the DST transition?" Enters network science: We disentangled our frictional network into 1) isolated edges, 2) Connected edges, and 3) closed cycles, aka loops (3-8).

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Abhinendra Singh @asingh-case.bsky.social · 09/09/2025

It is established that DST manifests itself as a stress-activated transition from an unconstrained to a constrained state, leading to the formation of the frictional contact network. Now the question we had was “How about the topology/motif of this network that underpins DST?”

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