Clear air turbulence has long been a nuisance and a hazard to aircraft and passengers. It is invisible, unpredictable, and tends to strike when it is least welcome - during your in-flight lunch, for example.
But turbulence also occurs closer to the ground, and a better understanding of how it works would be extremely helpful to the aviation and other industries.
My research group at the Ecole Polytechnique Federale de Lausanne (EPFL) focuses on wind engineering and renewable energy, and understanding atmospheric turbulence is vital.
Wind may flow smoothly into a wind turbine, but the rotating blades that slice through the moving air stir it up into a chaotic collage of whorls - turbulence.
Since it takes time for this turbulence to die down, a second turbine further downwind will be driven by wind that hasn't yet had time to fully settle.
This process can repeat itself throughout an entire wind farm, cutting the output of downwind turbines by up to 40 per cent.
But turbulence is hard to measure. In wind farms, researchers usually rely on sensors mounted on poles or towers. But you just can't set up enough sensors at enough locations within and surrounding a wind farm to get an accurate picture of where the main whorls tend to be, how far they extend, and how long they persist.
Working with EPFL Middle East, we have developed a way to solve this conundrum using beams of bundled light - lasers.
By shooting a laser beam into the air and measuring the light reflected back by humidity or tiny particles in the atmosphere, a lidar - the laser equivalent of a radar - can provide a detailed profile of the air it traverses, almost in real time.
Last year, for the first time, we used multiple lidars to detect the three-dimensional structure of turbulence behind a real wind turbine.
These unique field measurements can be used to confirm the predictions of computer simulations of wind blowing through wind farms, and provide data that is otherwise difficult or impossible to obtain.
Turbulent phenomena are complex, and it often takes more than one single experimental method to identify and understand them.
In wind tunnel experiments we recently found that the turbulence created by wind turbines settles faster when the surrounding air is itself turbulent - such as on a hot day when the warm ground heats the air just above it, setting it in motion.
Our computer simulations under these so-called convective conditions show the same behaviour. Now we plan on studying the turbulence behind the wind turbines in Valais, Switzerland, on a hot day to see if we can confirm this phenomenon outdoors, and understand why it occurs.
In the long run, we expect a better understanding of these phenomena to lead to improved design of wind farms, taking into account not only the arrangement of the individual turbines within them, but also the surrounding topography, climate, and dominant winds, ultimately leading to more efficient exploitation of these expensive infrastructure projects.
Our ability to visualise turbulence has found applications in other fields, too.
Solar Impulse is a lightweight solar aircraft on a mission to achieve what seems impossible: to fly around the planet without a drop of fuel.
The challenge at the moment is that the plane, being developed in Switzerland, is so light that it gets bounced around by turbulence like a bird in a storm.
At high altitudes this risk can be managed, but nearer the ground, especially during take-off and landing, a bounce in the wrong direction could be dangerous.
Addressing this risk, we collaborated with Solar Impulse to develop a portable lidar-based solution to scan the air around the airfield for dangerous whorls.
Once the system gives a pilot the green light, he or she can be assured that the plane will safely descend towards the runway for landing.
Prof Fernando Porte-Agel is the director of the Wind Engineering and Renewable Energy Laboratory at EPFL in Lausanne, Switzerland
The%20specs
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Volvo ES90 Specs
Engine: Electric single motor (96kW), twin motor (106kW) and twin motor performance (106kW)
Power: 333hp, 449hp, 680hp
Torque: 480Nm, 670Nm, 870Nm
On sale: Later in 2025 or early 2026, depending on region
Price: Exact regional pricing TBA
Other acts on the Jazz Garden bill
Sharrie Williams
The American singer is hugely respected in blues circles due to her passionate vocals and songwriting. Born and raised in Michigan, Williams began recording and touring as a teenage gospel singer. Her career took off with the blues band The Wiseguys. Such was the acclaim of their live shows that they toured throughout Europe and in Africa. As a solo artist, Williams has also collaborated with the likes of the late Dizzy Gillespie, Van Morrison and Mavis Staples.
Lin Rountree
An accomplished smooth jazz artist who blends his chilled approach with R‘n’B. Trained at the Duke Ellington School of the Arts in Washington, DC, Rountree formed his own band in 2004. He has also recorded with the likes of Kem, Dwele and Conya Doss. He comes to Dubai on the back of his new single Pass The Groove, from his forthcoming 2018 album Stronger Still, which may follow his five previous solo albums in cracking the top 10 of the US jazz charts.
Anita Williams
Dubai-based singer Anita Williams will open the night with a set of covers and swing, jazz and blues standards that made her an in-demand singer across the emirate. The Irish singer has been performing in Dubai since 2008 at venues such as MusicHall and Voda Bar. Her Jazz Garden appearance is career highlight as she will use the event to perform the original song Big Blue Eyes, the single from her debut solo album, due for release soon.
COMPANY%20PROFILE
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UAE Premiership
Results
Dubai Exiles 24-28 Jebel Ali Dragons
Abu Dhabi Harlequins 43-27 Dubai Hurricanes
Fixture
Friday, March 29, Abu Dhabi Harlequins v Jebel Ali Dragons, The Sevens, Dubai
Brief scoreline:
Liverpool 5
Keita 1', Mane 23', 66', Salah 45' 1, 83'
Huddersfield 0
Company profile
Name: Steppi
Founders: Joe Franklin and Milos Savic
Launched: February 2020
Size: 10,000 users by the end of July and a goal of 200,000 users by the end of the year
Employees: Five
Based: Jumeirah Lakes Towers, Dubai
Financing stage: Two seed rounds – the first sourced from angel investors and the founders' personal savings
Second round raised Dh720,000 from silent investors in June this year
If you go
The flights
There are various ways of getting to the southern Serengeti in Tanzania from the UAE. The exact route and airstrip depends on your overall trip itinerary and which camp you’re staying at.
Flydubai flies direct from Dubai to Kilimanjaro International Airport from Dh1,350 return, including taxes; this can be followed by a short flight from Kilimanjaro to the Serengeti with Coastal Aviation from about US$700 (Dh2,500) return, including taxes. Kenya Airways, Emirates and Etihad offer flights via Nairobi or Dar es Salaam.
COMPANY%20PROFILE
%3Cp%3E%3Cstrong%3ECompany%3A%20%3C%2Fstrong%3EMascotte%20Health%3C%2Fp%3E%0A%3Cp%3E%3Cstrong%3EStarted%3A%20%3C%2Fstrong%3E2023%3C%2Fp%3E%0A%3Cp%3E%3Cstrong%3EBased%3A%20%3C%2Fstrong%3EMiami%2C%20US%3C%2Fp%3E%0A%3Cp%3E%3Cstrong%3EFounder%3A%3C%2Fstrong%3E%20Bora%20Hamamcioglu%3C%2Fp%3E%0A%3Cp%3E%3Cstrong%3ESector%3A%20%3C%2Fstrong%3EOnline%20veterinary%20service%20provider%3C%2Fp%3E%0A%3Cp%3E%3Cstrong%3EInvestment%20stage%3A%3C%2Fstrong%3E%20%241.2%20million%20raised%20in%20seed%20funding%3C%2Fp%3E%0A
Our family matters legal consultant
Name: Hassan Mohsen Elhais
Position: legal consultant with Al Rowaad Advocates and Legal Consultants.
Results
6.30pm: Dubai Millennium Stakes Group Three US$200,000 (Turf) 2,000m; Winner: Ghaiyyath, William Buick (jockey), Charlie Appleby (trainer).
7.05pm: Handicap $135,000 (T) 1,600m; Winner: Cliffs Of Capri, Tadhg O’Shea, Jamie Osborne.
7.40pm: UAE Oaks Group Three $250,000 (Dirt) 1,900m; Winner: Down On Da Bayou, Mickael Barzalona, Salem bin Ghadayer.
8.15pm: Zabeel Mile Group Two $250,000 (T) 1,600m; Winner: Zakouski, James Doyle, Charlie Appleby.
8.50pm: Meydan Sprint Group Two $250,000 (T) 1,000m; Winner: Waady, Jim Crowley, Doug Watson.
The rules on fostering in the UAE
A foster couple or family must:
- be Muslim, Emirati and be residing in the UAE
- not be younger than 25 years old
- not have been convicted of offences or crimes involving moral turpitude
- be free of infectious diseases or psychological and mental disorders
- have the ability to support its members and the foster child financially
- undertake to treat and raise the child in a proper manner and take care of his or her health and well-being
- A single, divorced or widowed Muslim Emirati female, residing in the UAE may apply to foster a child if she is at least 30 years old and able to support the child financially
At a glance
Global events: Much of the UK’s economic woes were blamed on “increased global uncertainty”, which can be interpreted as the economic impact of the Ukraine war and the uncertainty over Donald Trump’s tariffs.
Growth forecasts: Cut for 2025 from 2 per cent to 1 per cent. The OBR watchdog also estimated inflation will average 3.2 per cent this year
Welfare: Universal credit health element cut by 50 per cent and frozen for new claimants, building on cuts to the disability and incapacity bill set out earlier this month
Spending cuts: Overall day-to day-spending across government cut by £6.1bn in 2029-30
Tax evasion: Steps to crack down on tax evasion to raise “£6.5bn per year” for the public purse
Defence: New high-tech weaponry, upgrading HM Naval Base in Portsmouth
Housing: Housebuilding to reach its highest in 40 years, with planning reforms helping generate an extra £3.4bn for public finances
Results:
First Test: New Zealand 30 British & Irish Lions 15
Second Test: New Zealand 21 British & Irish Lions 24
Third Test: New Zealand 15 British & Irish Lions 15
In numbers: PKK’s money network in Europe
Germany: PKK collectors typically bring in $18 million in cash a year – amount has trebled since 2010
Revolutionary tax: Investigators say about $2 million a year raised from ‘tax collection’ around Marseille
Extortion: Gunman convicted in 2023 of demanding $10,000 from Kurdish businessman in Stockholm
Drug trade: PKK income claimed by Turkish anti-drugs force in 2024 to be as high as $500 million a year
Denmark: PKK one of two terrorist groups along with Iranian separatists ASMLA to raise “two-digit million amounts”
Contributions: Hundreds of euros expected from typical Kurdish families and thousands from business owners
TV channel: Kurdish Roj TV accounts frozen and went bankrupt after Denmark fined it more than $1 million over PKK links in 2013
Results
1. Lewis Hamilton (Mercedes) 1hr 32mins 03.897sec
2. Max Verstappen (Red Bull-Honda) at 0.745s
3. Valtteri Bottas (Mercedes) 37.383s
4. Lando Norris (McLaren) 46.466s
5.Sergio Perez (Red Bull-Honda) 52.047s
6. Charles Leclerc (Ferrari) 59.090s
7. Daniel Ricciardo (McLaren) 1:06.004
8. Carlos Sainz Jr (Ferrari) 1:07.100
9. Yuki Tsunoda (AlphaTauri-Honda) 1:25.692
10. Lance Stroll (Aston Martin-Mercedes) 1:26.713,
NO OTHER LAND
Director: Basel Adra, Yuval Abraham, Rachel Szor, Hamdan Ballal
Stars: Basel Adra, Yuval Abraham
Rating: 3.5/5
Our legal consultant
Name: Dr Hassan Mohsen Elhais
Position: legal consultant with Al Rowaad Advocates and Legal Consultants.
Mercer, the investment consulting arm of US services company Marsh & McLennan, expects its wealth division to at least double its assets under management (AUM) in the Middle East as wealth in the region continues to grow despite economic headwinds, a company official said.
Mercer Wealth, which globally has $160 billion in AUM, plans to boost its AUM in the region to $2-$3bn in the next 2-3 years from the present $1bn, said Yasir AbuShaban, a Dubai-based principal with Mercer Wealth.
“Within the next two to three years, we are looking at reaching $2 to $3 billion as a conservative estimate and we do see an opportunity to do so,” said Mr AbuShaban.
Mercer does not directly make investments, but allocates clients’ money they have discretion to, to professional asset managers. They also provide advice to clients.
“We have buying power. We can negotiate on their (client’s) behalf with asset managers to provide them lower fees than they otherwise would have to get on their own,” he added.
Mercer Wealth’s clients include sovereign wealth funds, family offices, and insurance companies among others.
From its office in Dubai, Mercer also looks after Africa, India and Turkey, where they also see opportunity for growth.
Wealth creation in Middle East and Africa (MEA) grew 8.5 per cent to $8.1 trillion last year from $7.5tn in 2015, higher than last year’s global average of 6 per cent and the second-highest growth in a region after Asia-Pacific which grew 9.9 per cent, according to consultancy Boston Consulting Group (BCG). In the region, where wealth grew just 1.9 per cent in 2015 compared with 2014, a pickup in oil prices has helped in wealth generation.
BCG is forecasting MEA wealth will rise to $12tn by 2021, growing at an annual average of 8 per cent.
Drivers of wealth generation in the region will be split evenly between new wealth creation and growth of performance of existing assets, according to BCG.
Another general trend in the region is clients’ looking for a comprehensive approach to investing, according to Mr AbuShaban.
“Institutional investors or some of the families are seeing a slowdown in the available capital they have to invest and in that sense they are looking at optimizing the way they manage their portfolios and making sure they are not investing haphazardly and different parts of their investment are working together,” said Mr AbuShaban.
Some clients also have a higher appetite for risk, given the low interest-rate environment that does not provide enough yield for some institutional investors. These clients are keen to invest in illiquid assets, such as private equity and infrastructure.
“What we have seen is a desire for higher returns in what has been a low-return environment specifically in various fixed income or bonds,” he said.
“In this environment, we have seen a de facto increase in the risk that clients are taking in things like illiquid investments, private equity investments, infrastructure and private debt, those kind of investments were higher illiquidity results in incrementally higher returns.”
The Abu Dhabi Investment Authority, one of the largest sovereign wealth funds, said in its 2016 report that has gradually increased its exposure in direct private equity and private credit transactions, mainly in Asian markets and especially in China and India. The authority’s private equity department focused on structured equities owing to “their defensive characteristics.”
A MINECRAFT MOVIE
Director: Jared Hess
Starring: Jack Black, Jennifer Coolidge, Jason Momoa
Rating: 3/5
Result
UAE (S. Tagliabue 90 1') 1-2 Uzbekistan (Shokhruz Norkhonov 48', 86')
UPI facts
More than 2.2 million Indian tourists arrived in UAE in 2023
More than 3.5 million Indians reside in UAE
Indian tourists can make purchases in UAE using rupee accounts in India through QR-code-based UPI real-time payment systems
Indian residents in UAE can use their non-resident NRO and NRE accounts held in Indian banks linked to a UAE mobile number for UPI transactions
Leaderboard
15 under: Paul Casey (ENG)
-14: Robert MacIntyre (SCO)
-13 Brandon Stone (SA)
-10 Laurie Canter (ENG) , Sergio Garcia (ESP)
-9 Kalle Samooja (FIN)
-8 Thomas Detry (BEL), Justin Harding (SA), Justin Rose (ENG)
%E2%80%98FSO%20Safer%E2%80%99%20-%20a%20ticking%20bomb
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Profile of Bitex UAE
Date of launch: November 2018
Founder: Monark Modi
Based: Business Bay, Dubai
Sector: Financial services
Size: Eight employees
Investors: Self-funded to date with $1m of personal savings
Rooney's club record
At Everton Appearances: 77; Goals: 17
At Manchester United Appearances: 559; Goals: 253
WIDE%20VIEW
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The Perfect Couple
Starring: Nicole Kidman, Liev Schreiber, Jack Reynor
Creator: Jenna Lamia
Rating: 3/5
Match info
Who: India v Afghanistan
What: One-off Test match, Bengaluru
When: June 14 to 18
TV: OSN Sports Cricket HD, 8am starts
Online: OSN Play (subscribers only)