Articles tagged with Turbulence
Physicists at Princeton Plasma Physics Laboratory have modeled how recycled neutral atoms enhance turbulence driven by the ion temperature gradient, cooling plasma and reducing rotation rates. The results could lead to improved understanding of plasma performance in future tokamaks and international fusion facilities like ITER.
A new study describes a method to save lives in chemical attacks by predicting the trajectory of released chemical plumes. The research team developed an early warning prediction system using a weather forecasting model and local sensor data, which was able to accurately predict the spread of gas in a recent Syrian attack.
A team of scientists recreated turbulent magnetic field dynamics in a lab setting, mirroring the evolution of stars and plasma behavior. The study's findings have an uncanny resemblance to satellite data on the solar wind and magnetosheath.
A team of researchers at RWTH Aachen University used the Cray XC40 Hazel Hen supercomputer to simulate turbulent multiphase flows, paving the way for more accurate modeling and design of cleaner coal plants. The study's findings support the team's goal of improving CO2 emissions from coal power plants.
Researchers found turbulence caused by colliding galaxy clusters creates hot gas between them, about three times hotter than the sun's core. The team used NASA's Chandra X-ray Observatory and radio astronomy facility to study the phenomenon.
A new simulation based on the von-Kármán-Sodium (VKS) dynamo experiment investigates the effects of fluid resistivity and turbulence on the collimation of the magnetic field. Researchers found that using magnetized ferromagnetic materials increases the magnetic field collimation, while conducting materials weaken it. This study contrib...
Physicists at PPPL have simulated the spontaneous transition of turbulence at the plasma edge to H-mode using a first-principles-based model. The simulation reveals that both turbulence-generated and non-turbulent sheared flows contribute to the bifurcation, providing the physics-basis for successful tokamak operation.
Researchers find a mathematical signature of disintegration from order to chaos in swirling bacterial patterns. This discovery links turbulence in biology and physics, shedding light on the dynamics of active fluids.
Scientists clarify relationship between ion mass and plasma performance improvement. Turbulence suppression through electron-ion collisions leads to increased confinement and particle heat management. Zonal flows play a crucial role in suppressing turbulence, grinding eddies and waves that improve plasma performance.
Researchers from Lomonosov Moscow State University studied Keplerian shear flow stability, predicting turbulent behavior at high Reynolds numbers. They employed a variational approach to model non-ionized matter flows.
A new study finds that climate change will lead to a significant increase in severe turbulence, with some flights experiencing turbulent conditions twice as often as currently. The research suggests that the average amount of light turbulence will rise by 59% and moderate turbulence by 94%.
Researchers at PPPL and General Atomics simulated a self-organized flow of superhot plasma that fuels fusion reactions. The findings show that sufficient heating can drive instabilities leading to plasma rotation, which may be used to improve fusion device performance. High-energy beams traditionally injected into the plasma are replac...
Researchers develop an iterative simulation model that accurately predicts changes to line shape in strong plasma turbulence, providing a system for assessing plasma turbulence. The study finds that the width of hydrogen lines increases in presence of strong turbulence, with oscillating waves at plasma frequency.
Researchers discovered how plankton cope with turbulent layers in the ocean. Plankton cells change their shape from asymmetric to egg-shaped structures, allowing them to swim downwards and avoid damage. This adaptation provides an evolutionary advantage for the population, as only half of the cells are affected by turbulence.
Physicists developed a simple mathematical model to predict turbulent flows and verified it physically in a lab. They identified exact coherent structures (ECSs) that provide entry points for computing predictions about future turbulence behavior.
Scientists have identified a mechanism by which deep waters may rise to the surface through turbulence generated by underwater topographic features. This finding could help estimate how long the ocean stores carbon in its deepest regions before returning it to the surface.
Researchers have discovered a key link between plasma flow and turbulent transport in toroidal fusion plasmas. This understanding has led to improved confinement regimes and reduced the prospects of fusion.
Researchers uncover link between vortices and statistical properties of hydrodynamic fluctuations, enabling prediction of pollutant advection and mixing. The study provides valuable insights into emergence of coherent structures like cyclones and anticyclones from chaotic conditions.
Researchers create swirling winds in laboratory using spinning table and massive garbage can, demonstrating that Jupiter's jets likely extend into its gaseous interior. The team's analog model mimics the planet's rapid rotation and turbulence conditions necessary for jet formation.
A new optical device has provided the most precisely detailed, real-time pictures to date of solar activity occurring across vast stretches of the star's surface. The system corrects images distorted by atmospheric turbulence, allowing researchers to analyze magnetic events and forces that propel the star's magnetic fields.
A team of researchers at UNIST has discovered the underlying physics of suppressing ELMs using magnetic perturbation. The study, published in Physical Review Letters, confirms that ELMs can be weakened by losing energy through interaction with turbulence induced by MP.
Researchers at UCLA's DIII-D National Fusion Facility discovered that plasma turbulence weakens inside large magnetic islands, allowing small islands to grow instead. This finding could lead to improved control of harmful magnetic islands and more efficient operation of fusion devices like ITER.
Researchers at PPPL found that mean flow energy is never more than 1% of turbulent energy in H-mode, ruling out the predator-prey model. This result deepens the mystery of H-mode, but may refocus efforts on other contenders for understanding its physics.
Researchers presented initial results from the upgraded NSTX-U facility, doubling magnetic field strength and plasma current. Key findings include surpassing predecessor's maximum magnetic field strength and reducing turbulence through heating power.
Researchers used unmanned aircraft to measure turbulent kinetic energy, aerosol particle concentration, and temperature fluctuations near the Earth's surface. The study found that black carbon aerosols suppress turbulence in the atmospheric boundary layer, exacerbating human health impacts and extreme weather events.
Scientists from the University of Warsaw have demonstrated that turbulence can be detected using existing navigation data, which could allow pilots to avoid turbulence and forecast its occurrences. The new method uses flight parameters broadcast by commercial aircraft and has shown accuracy of only 20 km.
NASA's Solar Dynamics Observatory (SDO) captured a video of twisting solar material on the sun's surface, showcasing turbulence caused by combative magnetic forces. The footage reveals a dark filament suspended above the sun's surface.
Marine invertebrate larvae of sea urchins demonstrate active responses to turbulence and flow conditions by adjusting their swimming speeds. This behavior has significant implications for the adult populations' transport, survival, and recruitment.
A new vortex identification method has been proposed to accurately visualize vortices in complex 3D flows. The method uses a ratio of vorticity square over the sum of vorticity square and deformation square to define and identify vortex structures, offering a universal and accurate approach.
University of Minnesota researchers develop a new approach to studying turbulence in jets, revealing new coherent modes associated with high-speed jet dynamics. This discovery helps explain why jet engines produce such loud noise and could lead to new approaches for reducing volume levels.
Current measurement methods may underestimate the amount of plastic in oceans due to turbulent mixing. Researchers found that surface heating and ocean currents mix plastics deeper into the water column.
New findings suggest that turbulent plasma could improve inertial confinement fusion experiments by storing energy. The compression of fluid turbulence was modeled to show a positive impact on ICF experiments, suggesting a new design for compression-based fusion research. However, caveats and challenges remain in the field.
Physicists have made breakthrough in understanding plasma turbulence that drives fusion energy, using high-resolution multi-scale simulations. The study resolves multiple turbulence instabilities and explains heat loss mismatch between theoretical predictions and experimental observations.
Researchers discovered intense deep-ocean turbulence in the equatorial Pacific that plays a crucial role in driving global ocean circulation. The study, published online in Geophysical Research Letters, suggests that this mixing can be simulated using computer models to improve future climate forecasts.
Researchers at PPPL gained insights into how turbulence affects heat leakage in fusion plasmas, finding a steep density gradient reduces electron turbulence and heat loss. This could lead to more efficient fusion reactors like ITER, reducing heat leakage.
Researchers have solved a century-old question regarding the nature of turbulence's onset, finding it to be a directed percolation phase transition. This behavior is similar to that seen in epidemic spreading in populations, where fluctuations are characterized by critical exponents.
Researchers at MIT have found a key to solving the great unsolved problem of heat loss in fusion reactors. Interactions between turbulence at the tiniest scale, that of electrons, and turbulence at a much larger scale, that of ions, can account for the discrepancy between theory and experimental results.
Researchers have discovered that the disks of gas and dust surrounding massive black holes are 'clumpy,' not smooth. The observations were made using NASA's NuSTAR and European Space Agency's XMM-Newton space observatory.
A team of international researchers employed powerful computer simulations to study the creation of jets in dying stars. Their work sheds light on an explosive chain reaction that helps form the structure of the universe. The simulations revealed a highly turbulent place, where magnetorotational instability drives the formation of jets.
Researchers at DOE's Princeton Plasma Physics Laboratory have modeled new sources of turbulence in spherical tokamaks, a potential game-changer for fusion energy. The findings suggest that keeping non-uniform plasma flows within an optimized level and reducing trapped electron collisions could improve plasma confinement.
Research by Urvashi Bhattacharyya and Upinder Bhalla found that rats used a 'run-and-scan' approach to locate targets, scanning across options before selecting the correct one. This strategy outperformed 'tracking' in familiar environments with known paths to food.
Researchers developed a theory explaining the lifetime of turbulent flows by drawing an analogy with ecosystems near extinction. Computer simulations showed that turbulence excites and inhibits large-scale zonal flow, leading to oscillations in its intensity.
Researchers have successfully simulated deuterium plasma turbulence in the Large Helical Device (LHD) using the Plasma Simulator, a cutting-edge supercomputer. The results show improved energy confinement in deuterium plasma compared to hydrogen plasma.
Researchers at National Institute for Fusion Science have discovered a new confinement state inside a magnetic island, essential for improving fusion reactor plasma confinement. This breakthrough was achieved through the 'momentary heating propagation method' and has implications for future fusion research.
Researchers found that zooplankton copepods display energetic behavior in turbulent flows, amplifying the flow's intermittent properties. Their self-induced motion adds to fluctuations in speed, affecting feeding efficiency and ecological modeling.
Researchers have used a supercomputer to simulate plasma turbulence, finding that long and short wavelength turbulence coexist and interact strongly, increasing heat losses tenfold above standard models. This discovery may inform fusion reactor design and bring us closer to practical fusion energy.
Turbulence plays a crucial role in nature and technology, influencing pollutant spread and fuel efficiency. A new study reveals how fully turbulent flows arise in pipe and square duct flows, with potential benefits for oil pipelines and combustion motors.
A SwRI-led study found that a comet's tail can provide insights into the solar wind's variable nature and high temperatures. Turbulence in the solar wind was observed to drive high-temperatures, while mixing of turbulent motions explains variability.
Researchers discovered that nocturnal moths rely on turbulent fluctuations in the airstream to determine wind direction, whereas songbirds do not. This ability helps them cope with wind when traveling at high altitudes and allows for more accurate navigation.
Scientists have discovered that injecting tiny grains of lithium into a plasma can dramatically improve its temperature and pressure, doubling the pressure at the outer edge and increasing the length of time it remains high. This breakthrough could lead to more efficient fusion reactions and potentially shorten the development timeline.
New research using high-resolution observations reveals that magnetic fields in the Cat's Paw Nebula preserve their direction from large to small scales. This suggests that self-gravity and turbulence cannot significantly alter the field direction, allowing for a more detailed understanding of star formation.
Researchers at UC San Diego have developed a new family of time-resolved numerical simulation methods that significantly increase the speed of complex fluid and plasma simulations. The breakthrough reduces memory usage, allowing for larger simulations to be considered.
Researchers use a cylindrical rotating system to study turbulent convection, disproving the idea that transitions from one state of turbulence to another are smooth. Their findings suggest that symmetry changes must be sharp, contradicting Lev Landau's theory.
Researchers applied an electric field to a section of the Keystone pipeline, smoothing oil flow and reducing pump energy savings. The Applied Oil Technology (AOT) device produced significant reductions in viscosity and turbulence, leading to a 75% decrease in pump power from 2.8 megawatts to 0.7 megawatts.
Researchers from MIPT and Weizmann Institute of Science discover possibility of negative turbophoresis, where impurity particles move against turbulence direction. The study presents new type of phase transition, depending on particle inertia, which can either localize or delocalize in turbulent flows.
Scientists have made groundbreaking discoveries about how space weather affects our planet, including the role of magnetic reconnection in accelerating solar wind particles. Researchers have also found significant differences in plasma density between the solar wind and magnetosphere, shedding light on this complex phenomenon.
Scientists at MIT and General Atomics successfully controlled the density of a fusion plasma using radio waves. The experiments revealed that turbulent density fluctuations intensify when most heat goes to electrons, which can be used to minimize turbulence and optimize core temperature under fusion conditions.
Birds use collapsible wing tucks to respond to turbulent air masses, reducing lift and minimizing jolting. Researchers found that this technique could potentially be used in micro air vehicles to maintain stability in windy conditions.
Researchers from Brown University have introduced a new element of uncertainty into Burgers' equation to describe turbulence and shocks in fluid flows. This formulation aims to make mathematical models more realistic by accounting for external influences such as terrain, which was previously ignored in standard equations.
A study published in Nature found that the chemical uniformity of stars in the same cluster is due to turbulent mixing in star-forming clouds. This mixing occurs before much of the gas has turned into stars, resulting in nearly identical chemical signatures among sibling stars.