Nonlinear dynamics of shells and plates subjected to pulsatile flow
Bibliographic record
Abstract
Flow-induced vibrations due to unsteady flow often occur in many engineering areas.A specific type of unsteady flow is represented by oscillatory and pulsatile flows, which are prevalent in industrial and biological systems; applications include pump and valve operations in pipeline systems as well as blood circulation.Associated to pulsatility, wave propagation in elastic tubes is recognised as the fundamental principle of the pressure pulse in arteries.This propagation phenomenon is due to the fluid-structure interaction and not to fluid compressibility.The pulse wave velocity is related to the underlying vessel wall stiffness.In biomechanics and vascular surgery, thin-walled shell theory can be applied to model the mechanics of veins, arteries, pulmonary passages, and artificial blood vessels.This thesis focuses on the development of a new theoretical framework able to reproduce the nonlinear dynamic response of shells and plates to axial pulsatile flow.The flow is set in motion by a pulsatile pressure gradient.Coupled fluid-structure Lagrange equations of motion for a non-material volume subject to pulsatile flow and pressure with and without wave propagation are obtained and presented for the first time in the literature.The studied systems are represented by a plate periodically supported and a circular cylindrical shell with flexible boundary conditions.The fluid model is based on the potential flow theory.Numerical bifurcation analysis and time integration methods are employed to investigate the stability of the systems described using a refined reduced order model.
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How this classification was reachedexpand
Full frame machine prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. The Gemma side is a direct model label for every work in the frame, read from the title-only record. The Codex side is a classifier learned from the 10,348 direct Codex labels and calibrated to design-weighted sample rates; fields without enough sample support carry no Codex call. Candidate is the union of the two sides; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels.
Distilled classifier scores by category (both heads)
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.000 | 0.001 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.000 | 0.000 |
| Science and technology studies | 0.000 | 0.001 |
| Scholarly communication | 0.001 | 0.001 |
| Open science | 0.001 | 0.002 |
| Research integrity | 0.001 | 0.001 |
| Insufficient payload (model declined to judge) | 0.003 | 0.000 |
Machine scores (provisional)
The two teacher heads of the student model, read on this work. A score orders the frame for review; it never asserts a category, and the validation status ships verbatim with every row.
Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.
score_only:v0-immature-baseline · verbatim from the scoring run: score_only means the number may rank works, and no category label ships from itClassification
machine, unvalidatedMachine predicted; a candidate call from one source (direct Gemma or distilled Codex), not a consensus.
How this classification was reached, model by model and score by score, is at the end of the page under "How this classification was reached".