{"schema":"pubphys.bundle/1","record":{"author":{"account_ref":null,"orcid":null},"builds_on":[],"content_schema":"pubphys.content.revision/1","content_sha256":"1a202dab5bc7c5a2b376298dfe8d451c013825397850aa144c7b55bce8f12ac6","created":"2026-10-03T07:18:03Z","files":[],"origin":{"assisted_by":[],"kind":"seed"},"parents":["5475cf5dc5b1a72283d26dc95dc6e00d7ea4e00096a7c6492e409a1816eeb011"],"salt":"285f8a32611fdd475f9a1a9a957782c669396e57b8841d77099a6159835f6c2f","schema":"pubphys.record/2","site":"pubphys.com","target":null,"type":"revision"},"content":{"answer_type":"yes-no","assisted_by":[],"external_id":"fluid.elastic-turbulence.eit-et-continuity","kind":"well-posed","literature_status":"partially-resolved","n":"1","parents":[],"plain":"Polymer solutions show chaotic flow both at moderate speeds, where inertia helps, and at vanishing speeds, from elasticity alone. Whether these are two forms of one state is unknown.","posed_since":"2021","precise":"In the $(\\mathrm{Re}, \\mathrm{Wi}, \\beta)$ parameter space of channel or pipe flow of FENE-P or simplified Phan-Thien-Tanner fluids, is there a continuous path from elasto-inertial turbulence at $\\mathrm{Re} \\sim 10^{3}$ to purely elastic turbulence at $\\mathrm{Re} \\to 0$ along which the organizing coherent structures (center-mode travelling waves, arrowhead or narwhal states) persist? Answer: yes or no, with the path or the boundary that separates the two.","problem_ref":null,"references":"","settled_by":"Numerical continuation of coherent states and chaotic attractors across the full Re range for one constitutive model, checked against experiments with matched rheology.","status_note":"Linear-stability continuation (Khalid, Shankar, Subramanian 2021) and 2024 simulations support a link; 2026 pipe experiments find a change in threshold scaling where inertia vanishes.","title":"Are elasto-inertial and purely elastic turbulence the same 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