Nonlinear dynamics in fluids is a research area focused on the analysis and prediction of fluid flows governed by nonlinear partial differential equations, such as the Navier–Stokes and Euler equations. It investigates phenomena including hydrodynamic instabilities, transition to turbulence, coherent structures, pattern formation, and spatiotemporal chaos across a wide range of Reynolds numbers. Methods commonly involve asymptotic analysis, bifurcation theory, dynamical systems approaches, numerical simulation, and experimental visualization. The field aims to characterize attractors, energy cascades, and multiscale interactions in laminar, transitional, and turbulent regimes, informing modeling, control, and reduced-order descriptions of complex fluid behavior in both natural and engineered systems.
Water and oil, and some other simple fluids, respond in the same way to all levels of shear stress. These are termed Newtonian fluids, and their viscosity is constant for all stresses although it will vary with temperature. ...
Soft Matter
Oct 28, 2024
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40
An altogether new convective instability has been predicted and experimentally discovered, 140 years after Lord Rayleigh. Convective instabilities are of fundamental importance for both our everyday life as well as for ecology ...
Microplastics are a global problem: they end up in rivers and oceans, they accumulate in living organisms and disrupt entire ecosystems. How tiny particles behave in a current is difficult to describe scientifically, especially ...
General Physics
Aug 12, 2024
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287
When materials are subjected to extreme environments, they face the risk of mixing together. This mixing may result in hydrodynamic instabilities, yielding undesirable side effects. Such instabilities present a grand challenge ...
General Physics
May 13, 2024
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84
Light can compute functions during its propagation and interaction with structured materials, with high speed and low energy consumption. Achieving universal computing using all-optical neural networks requires optical activation ...
Optics & Photonics
Mar 19, 2024
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90
Falling from the tip of a brush suspended in mid-air, an ink droplet touches a painted surface and blossoms into a masterpiece of ever-changing beauty. It weaves a tapestry of intricate, evolving patterns. Some of them resemble ...
Soft Matter
Mar 4, 2024
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182
Solitons are quasiparticles that propagate along a non-dissipative wave. Put another way, they are waveforms that hold their shape as they move—like a single wave moving across the surface of a pond. They can also show particle-like ...
Optics & Photonics
Jan 31, 2024
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72
Fresh research into the physics of vibrating nanobubbles reveals that they do not heat up as much as previously thought. The work appears in Nano Letters.
Nanophysics
Jan 24, 2024
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115
Weather forecasting is important for various sectors, including agriculture, military operations, and aviation, as well as for predicting natural disasters like tornados and cyclones. It relies on predicting the movement ...
General Physics
Jan 4, 2024
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910
When you uncork a bottle of champagne, complex supersonic phenomena occur. Scientists at TU Wien have now been able to calculate exactly what happens for the first time.
General Physics
Dec 21, 2023
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188
