Tags: fluid dynamics*

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  1. Terence Tao writes about recent mathematical breakthroughs by Alpöge and Buckmaster regarding singularity formation in fluid dynamics. Building on previous work by Córdoba and Martínez-Zoroa, these researchers demonstrated finite-time blowup for the incompressible porous medium (IPM) equation, the two-dimensional Boussinesq equation, and the three-dimensional incompressible Euler equations using smooth forcing terms or initial data. Tao highlights that while full solutions to the Navier–Stokes global regularity problem remain unachieved by this method, it significantly increases their feasibility in the near future.

    - The strategy involves iteratively constructing solutions by adding high-frequency corrections that cause singularities at a blowup time.
    - Recent work from Ganeshram, Duruisseaux, and Anandkumar utilizes physics-informed neural networks (PINNs) to locate self-similar blowup profiles for Euler equations.
    - A significant controversy exists regarding whether AI models may have "mined" human research results without proper attribution or credit.
    - Tao describes the current status of some AI-generated proofs as being in a novel stage between a formally verified proof and a well-written, peer-reviewed paper.
  2. The Clay Mathematics Institute (CMI) has announced that the Navier-Stokes Millennium Prize Problem, which concerns the existence and smoothness of solutions in 3-dimensional Euclidean space, appears to have been settled. This announcement follows years of anticipation driven by breakthroughs in fluid dynamics and technological advancements in mathematical research. CMI noted its excitement regarding the potential for new human understanding resulting from this resolution.

    - The Millennium Prize Problems were established in Paris in 2000 with a $1M prize attached to each unsolved problem.
    - Solving these problems is intended to demonstrate that the frontier of mathematics remains open and accessible.
    - Each successful solution must undergo an unhurried evaluation process by CMI to assign credit according to specific rules.
  3. Research on the unicellular organism Stentor suggests that physical forces, specifically cooperative feeding dynamics, may have played a crucial role in the early evolution of multicellular life. These organisms form temporary colonies to enhance feeding efficiency but revert to solitary existence when resources are scarce, representing a stage before permanent multicellularity.
  4. Researchers led by Nigel Goldenfeld and Björn Hof offer new insights into the transition from laminar to turbulent water flow, solving a 150-year-old mystery. The interdisciplinary team applied statistical mechanics to reveal that the phenomenon behaves like directed percolation.
  5. 2020-07-01 Tags: , , by klotz

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