Current Turbulence News and Events

Current Turbulence News and Events, Turbulence News Articles.
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Ergodicity of turbulence measurements upon complex terrain in Loess Plateau
Ergodic properties of turbulence must be tested before experimental study. The terrain can be a major cause of periodic, large-scale turbulence, compared to which for the turbulence above the flat underlying surface, the large-scale (10-40 min) turbulence in the tableland region tends to be more steady and, thus, can also satisfy the ergodicity easily. But under the condition of extremely stable stratification, the aperiodicity of large-scale turbulence cannot satisfy ergodicity easily. (2021-02-02)

'Honey, I'm home:' Pandemic life for married couples can lead to sadness, anger
West Virginia University researchers led a study examining 165 married individuals and how their partners interfered with their daily routines in April 2020, a month into the pandemic. (2021-01-28)

Turbulence model could enhance rotorcraft, munitions performance
Design of Army aerial vehicles and weapon systems relies on the ability to predict aerodynamic behavior, often aided by advanced computer simulations of the flow of air over the body. High-fidelity simulations assist engineers in maximizing how much load a rotorcraft can lift or how far a missile can fly, but these simulations aren't cheap. A new turbulence model could change that (2021-01-25)

Record-breaking laser link could help us test whether Einstein was right
Scientists from Australia have set a world record for the most stable transmission of a laser signal through the atmosphere. The team combined Aussie 'phase stabilisation' technology with advanced self-guiding optical terminals to 'effectively eliminate atmospheric turbulence,' an advance which could help test Einstein's theory of general relativity. (2021-01-22)

Turbulence model could help design aircraft capable of handling extreme scenarios
To help build aircraft that can better handle violent turbulence, Purdue University researchers developed a new model that allows engineers to incorporate the physics of an entire vortex collision into their design codes. (2021-01-21)

Obese, snoring mini pigs show how air flows through the throat during sleep apnea
A study appearing January 19 in the journal Heliyon found that obese Yucatan mini pigs have naturally occurring sleep apnea and that MRI scans taken while they're in sedated sleep can be used to gain new insights into what happens in the airways during sleep apnea episodes via computational flow dynamic (CFD) analysis. (2021-01-19)

Scientists discover the secret of Galápagos' rich ecosystem
New research has unlocked the mystery of how the Galápagos Islands, a rocky, volcanic outcrop, with only modest rainfall and vegetation, is able to sustain its unique wildlife habitats. (2021-01-14)

Turbulent dynamics in the human brain could revolutionize the understanding of its functionality
According to a new study, published on 8 December in Cell Reports, by Gustavo Deco, director of the Center for Brain and Cognition, and Morten L. Kringelbach, researcher at the Department of Psychiatry of the University of Oxford (United Kingdom) and the Center for Music in the Brain of the University of Aarhus (Denmark). (2021-01-12)

Researchers use LRZ HPC resources to perform largest-ever supersonic turbulence simulation
A multi-institution collaboration being led by Australian National University Associate Professor Christoph Federrath and Heidelberg University Professor Ralf Klessen has been using HPC resources at the Leibniz Supercomputing Centre to study turbulence's influence on galaxy formation. The team recently revealed the so-called 'sonic scale' of astrophysical turbulence--marking the transition moving from supersonic to subsonic speeds--creating the largest-ever simulation of supersonic turbulence in the process. The team published its research in Nature Astronomy. (2021-01-11)

Compressive fluctuations heat ions in space plasma
New simulations carried out in part on the ATERUI II supercomputer in Japan have found that the reason ions exist at higher temperatures than electrons in space plasma is because they are better able to absorb energy from compressive turbulent fluctuations in the plasma. These finding have important implications for understanding observations of various astronomical objects such as the images of the accretion disk and shadow of the M87 supermassive black hole. (2020-12-18)

Characterising complex flows in 2D bubble swarms
Research published in EPJ E shows that in 2D simulated fluids, upward-flowing swarms of bubbles, a mathematical relationship describing the nature of flows in their wake, previously thought to be universal, actually changes within larger-scale flows in less viscous fluids. (2020-12-04)

Trees and green roofs can help reduce the urban heat island effect, finds a new study
Air pollution experts from the University of Surrey have found that green infrastructure (GI), such as trees, can help reduce temperatures in many of Europe's cities and towns. (2020-11-18)

Small finlets on owl feathers point the way to less aircraft noise
Collaboration between City, University of London and RWTH Aachen University researchers reveals how these micro-structures enable silent flight. (2020-11-18)

New method brings physics to deep learning to better simulate turbulence
Deep learning, also called machine learning, reproduces data to model problem scenarios and offer solutions. However, some problems in physics are unknown or cannot be represented in detail mathematically on a computer. Researchers at the University of Illinois Urbana-Champaign developed a new method that brings physics into the machine learning process to make better predictions. The researchers used turbulence to test their method. (2020-11-16)

Aurora-chasing citizen scientists help discover a new feature of STEVE
A new finding about the formation of streaks within the aurora-like STEVE phenomenon brings scientists one step closer to solving the mystery. (2020-11-13)

Modelling microswimmers for drug delivery
An international group of theoretical physicists led by Abdallah Daddi-Moussa-Ider from Düsseldorf, Germany, has modelled the motion of microscopic, motile bodies - either powered micro-machines or living cells - in viscous liquid drops, using the Navier-Stokes equations. This work, which has applications in materials science and medicine, is now published in EPJ E. (2020-11-11)

Recipe for a storm
Turbulence is an omnipresent phenomenon - and one of the great mysteries of physics. A research team from the University of Oldenburg in Germany has now succeeded in generating realistic storm turbulence in the wind tunnel of the Center for Wind Energy Research (ForWind). (2020-11-04)

A breakthrough of the mechanism of energy saving in collective swimming
Professor Xie Guangming's group in the College of Engineering at Peking University has found a simple yet previous unknown rule, explaining how do schooling fish save energy in collective motion. (2020-11-03)

Quieter wind beneath the wings
The ability to efficiently simulate the noise generated by wings and propellers promises to accelerate the development of quieter aircraft and turbines. (2020-09-27)

Promising computer simulations for stellarator plasmas
The turbulence code GENE (Gyrokinetic Electromagnetic Numerical Experiment), developed at Max Planck Institute for Plasma Physics (IPP) at Garching, Germany, has proven to be very useful for the theoretical description of turbulence in the plasma of tokamak-type fusion devices. Extended for the more complex geometry of stellarator-type devices, computer simulations with GENE now indicate a new method to reduce plasma turbulence in stellarator plasmas. This could significantly increase the efficiency of a future fusion power plant. (2020-09-18)

Climate change impacts astronomical observations
Already, climate change is having an impact on the conditions of space observation at the Very Large Telescope in the Atacama Desert. In future, new telescopes will have to be adapted to the expected changes, a study in 'Nature Astronomy' finds. (2020-09-17)

Turbulence affects aerosols and cloud formation
Turbulent air in the atmosphere affects how cloud droplets form. New research from Michigan Technological University's cloud chamber changes the way clouds, and therefore climate, are modeled. (2020-09-16)

Humid air can extend lifetime of virus-laden aerosol droplets
The coronavirus that causes COVID-19 is thought to spread through natural respiratory activities, but little is known about how the virus is transported through air. Scientists report in Physics of Fluids on how airflow and fluid flow affect exhaled droplets containing the virus. Their model includes a more accurate description of air turbulence that affects an exhaled droplet's trajectory. Calculations with their model reveal, among other things, an important and surprising effect of humid air. (2020-08-18)

Dome A in Antarctica is the best site for optical astronomical observation on Earth
A research team led by Prof. SHANG Zhaohui from National Astronomical Observatories of the Chinese Academy of Sciences (NAOC) has proved that Dome A in Antarctica is the best site for optical astronomical observation on Earth. (2020-08-03)

Astronomers pinpoint the best place on Earth for a telescope: High on a frigid Antarctic plateau
Dome A, the highest ice dome on the Antarctic Plateau, could offer the clearest view on Earth of the stars at night, according to new research by an international team from China, Australia and the University of British Columbia (UBC). The challenge? The location is one of the coldest and most remote places on Earth. (2020-07-29)

Best place on Earth to see stars is at remote site in Antarctica, study shows
Stars viewed from a place called Dome A in Antarctica can finally be seen without their twinkle -- which means in much greater detail. (2020-07-29)

Atmospheric turbulence affects new particle formation: Common finding on three continents
New particle formation (NPF) over three countries is investigated using aerosol physicochemical quantities and turbulence information. A common relationship is found between NPF and turbulence, and a new physical mechanism is proposed to complement the traditional photochemical mechanism, supported by both observational analyses and model simulations. Turbulence enhances supersaturation, accelerating the condensation of molecules, and facilitating nucleation formation, while the turbulence-dilution effect prevents the removal of preexisting particles, prolonging the growth of NPF. (2020-07-07)

First direct evidence of ocean mixing across the gulf stream
Study in the Proceedings of the National Academy of Sciences provides first direct evidence for Gulf Stream blender effect, identifying a new mechanism of mixing water across the swift-moving current. The results have important implications for weather, climate and fisheries because ocean mixing plays a critical role in these processes. The Gulf Stream is one of the largest drivers of climate and biological productivity from Florida to Newfoundland and along the western coast of Europe. (2020-07-06)

Scientists develop new tool to design better fusion devices
One way that scientists seek to bring to Earth the fusion process that powers the stars is trapping plasma within a twisting magnetic coil device shaped like a breakfast cruller. But the device, called a stellarator, must be precisely engineered to prevent heat from escaping the plasma core where it stokes the fusion reactions. Now, PPPL researchers have demonstrated that an advanced computer code could help design stellarators that confine the essential heat more effectively. (2020-06-24)

Laser technology: The Turbulence and the Comb
While the light of an ordinary laser only has one single, well-defined wavelength, a so-called ''frequency comb'' consists of different light frequencies, which are precisely arranged at regular distances, much like the teeth of a comb. Such frequency combs are difficult to generate. Now, researchers have succeeded in producing frequency combs using simple circular quantum cascade lasers - a result that seemed to contradict conventional laser theories completely. (2020-06-18)

Order from disorder
An international team of researchers have harnessed turbulence in light to create a specific type of high-precision laser, known as a laser frequency comb, in a system previously thought incapable of producing such a laser. The discovery could be used in a new generation of devices for applications such as optical spectroscopy and sensing. (2020-06-17)

Atherosclerosis -- How a microRNA protects vascular integrity
Ludwig-Maximilian-Universitaet (LMU) in Munich researchers have discovered a hitherto unknown molecular function of a specific microRNA that preserves integrity of the endothelium and reduces the risk of atherosclerosis. (2020-06-04)

Discovery about the edge of fusion plasma could help realize fusion power
Unique PPPL simulations reveal new understanding of the highly complex edge of fusion plasmas. (2020-05-21)

Mussel reefs heighten risk of microplastic exposure and consumption
In the first study of its kind, scientists found that when mussels were clumped together forming reefs -- as they do in nature -- the reef structure resulted in a three-fold rise in the amount of ingested plastic. (2020-05-18)

Blood flows could be more turbulent than previously expected
Blood flow in the human body is assumed to be mostly smooth and non-turbulent. Unstable and unsteady flow is linked to a variety of cardiovascular diseases including arteriosclerosis -- one of the leading causes of death worldwide. Now, Professor Björn Hof from the Institute of Science and Technology Austria, together with a team of international researchers has shown that our bloodstream is more turbulent than what has been previously thought. (2020-05-04)

Thermal tides cause Venus' atmosphere to rotate far faster than its surface
By tracking the thick clouds of Venus' rapidly rotating atmosphere, researchers have gained new insight into the dynamic forces that drive atmospheric super-rotation - a little-understood phenomenon in which an atmosphere rotates much faster than the solid planetary body below. (2020-04-23)

Atmospheric tidal waves maintain Venus' super-rotation
An international research team led by Takeshi Horinouchi of Hokkaido University has revealed that the 'super-rotation' on Venus is maintained near the equator by atmospheric tidal waves formed from solar heating on the planet's dayside and cooling on its nightside. The study was published online in Science on April 23. (2020-04-23)

Applying mathematics to accelerate predictions for capturing fusion energy
PPPL scientists have borrowed a technique from applied mathematics to rapidly predict the behavior of fusion plasma at a much-reduced computational cost. (2020-04-15)

Researchers report new understanding of energy fluctuations in fluids
The Casimir Force is a well-known effect originating from the quantum fluctuation of electromagnetic fields in a vacuum. Now an international group of researchers have reported a counterpoint to that theory, adding to the understanding of energy fluctuations within fluids. (2020-04-06)

Researchers unveil the universal properties of active turbulence
Turbulent flows are chaotic yet feature universal statistical properties.Over the recent years, seemingly turbulent flows have been discovered in active fluids such as bacterial suspensions, epithelial cell monolayers, and mixtures of biopolymers and molecular motors. In a new study published in Nature Physics, researchers from the University of Barcelona, Princeton University and Collège de France have shown that the chaotic flows in active nematic fluids are described by distinct universal scaling laws. (2020-04-02)

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