NTNU Strømningstekniske Laboratorier

It is the APS DFD conference time of the year. Amélie Ferran and R. Jason Hearst will be presenting at this year’s #APSDFD24 at Salt Lake City, Utah, USA. If you are attending, make sure to catch the presentations! In other news, our entry to last year’s Gallery of Fluid Motion “Unveiling the Hidden Dance: A Captivating Journey into Wing Tip Vortices” was hand-picked to be showcased in "Spiraling Upwards” (Traveling Gallery of Fluid Motion series). This exhibition focuses on the intersection of #LeonardoDaVinci's studies on fluid dynamics and flight and what better place for this than The Leonardo Museum in Salt Lake City? Don’t forget to check this exhibition out if you are attending #APSDFD24. Link to exhibition: https://lnkd.in/dbWt8rKD Here’s some more information about the presentations: 🔬 Title: Dynamics of gas exchange across the air-water interface: insights from PIV and LIF measurements Session R02: Free-Surface Flows: General Researchers: 🎤 R. Jason Hearst Adharsh Shankaran 🗓️ Date: 25 November 2024 ⏰ Time: 2:42pm-2:55pm MST 📍 Location: Ballroom B Abstract link: https://lnkd.in/g24SYdXW 🔬 Title: Inertial particles in turbulent/turbulent interfaces Session X02: Minisymposium: Inertial Particles in Inhomogeneous Turbulent Flows Researchers: 🎤 Amélie Ferran, Martin Obligado, Alberto Aliseda 🗓️ Date: 26 November 2024 ⏰ Time: 8:00am-8:26am MST 📍 Location: Ballroom B Abstract link: https://lnkd.in/dDk9VD8p #APSDFD24 #FluidDynamics #Research #Conference

The past few weeks have been filled with excitement and engagement at our Large-Scale Wind Tunnel and Turbulent Combustion Lab! We've had the pleasure of hosting several student groups, showcasing our research environment and activities, and (hopefully) inspiring the next generation of scientists and engineers: 1️⃣ Students from Fagerhaug International School brought their physics project to life, testing how the shape of their model rockets made with plastic bottles, as well as the addition of fins, affected the aerodynamics. 2️⃣ About 40 students from Charlottenlund Videregående Skole toured our labs, exploring both our wind tunnel and combustion lab. 3️⃣ Lastly, about 40 students from NTNU enrolled in the Fluid Mechanics course visited us as part of their curriculum, gaining practical insights into the working of large-scale experimental facilities and the research that goes on. It’s been fantastic to see so many young minds engaged and excited about fluid mechanics, combustion and research. We are happy to have had the opportunity to offer such engaging learning experiences that bridge theoretical knowledge and practical application. Thank you to the researchers in our group (Leon Li, Håkon T. Nygård, Aksel Ånestad, Silke DONADIO, Qian Wang & Srikar Yadala V) for making these tours and demonstrations possible! Photo credits: Srikar Yadala V (Fluids Lab & Equipment Coordinator) You can see the capabilities of our facilities and the research we do in the following links. Fluids Lab: https://lnkd.in/d76yiyvK  Combustion Lab: https://lnkd.in/djtyeXpF #NTNU #FluidMechanics #CombustionLab

We are very happy to share that Gonzalo Almanza Álvarez, a researcher in our group, successfully defended his PhD thesis last week. Congratulations Dr. Gonzalo Almanza Álvarez for this accomplishment. 👏

Last week was a busy one for researchers from our lab, as many of you might have seen! Firstly, we had a sizable contingent presenting various research efforts at the inaugural European Fluid Dynamics Conference in Aachen, Germany. In the photo, from left to right: Yi Hui Tee, Ingrid Neunaber, Youssef Elashmawi, R. Jason Hearst (standing), Leon Li, Ali Semati & Adharsh S.. Secondly, we hosted a stand at the Forskningstorget 2024 science fair in Trondheim, where we presented an interactive exhibit called “Dancing Plastics”. This demo showed how ocean turbulence transports microplastics. In the photo, you can see (right to left) Olav Rømcke, Håkon T. Nygård, Petter Rikheim Benonisen, and Terese Lovas, the Head of our Department of Energy and Process Engineering at NTNU, who visited our stand. Emilie Hjorth was also part of the event (not in the photo). Many congratulations to all the researchers involved in these successful events! 🎉 These efforts are part of the InMyWaves project funded by Marie Skłodowska-Curie Actions Postdoctoral Fellowship, and the GLITR and WaTurSheD projects funded by European Research Council (ERC). Many thanks to the funding agencies for their continued support. Photo from Forskningstorget 2024 taken by Priyanka Gautam, PhD. #FluidDynamics #Turbulence #Research #NTNU #Trondheim #MSCA #PublicEngagement

Join Us at Trondheim’s Forskningstorget 2024! On September 21st, researchers from our laboratory Olav Rømcke, Håkon T. Nygård, Petter Rikheim Benonisen and Emilie Hjorth will present an interactive exhibit, "Dancing Plastics" at Stall No. 10 during this year’s Forskningstorget at NTNU Kalvskinnet. Come and explore how ocean turbulence transports microplastics in our seas! Our researchers will demonstrate the invisible dance between plastic particles and turbulent ocean motions—giving you a unique glimpse into how plastic pollution spreads beneath the surface. This research is part of the "InMyWaves" project led by Yi Hui Tee and R. Jason Hearst, funded by the European Union through the Marie Skłodowska-Curie Actions Postdoctoral Fellowship, and the GLITR project led by R. Jason Hearst, funded through the European Research Council (ERC). Forskningstorget 2024 will be packed with exciting science activities suitable for both children and adults—completely free of charge! Don’t miss this chance to learn more about plastic pollution, cutting-edge turbulence research, and participate in a range of fun, engaging activities. 🗓️ When: 21st September, 11:00AM to 3:00PM 📍 Where: NTNU Kalvskinnet (Gunnerus gate 1, 7012 Trondheim), Stall No. 10 🎟️ Open to everyone—children and adults of all ages! Forskningstorger 2024: https://lnkd.in/dyCiNx3p GLITR project: https://lnkd.in/dPRMunvd InMyWaves project: https://lnkd.in/dzpzSM9K Photos taken during the Science is Wonderful fair held in Brussels in April 2024 by Peng Mun Siew. #Trondheim #NTNU #Forskningstorget2024 #Microplastics #PlasticPollution #MSCA #ERC #PublicEngagement

🌟 Our Lab at the 1st European Fluid Dynamics Conference! 🌟 We’re thrilled to announce that researchers from our lab will be presenting their latest work at the inaugural European Fluid Dynamics Conference (EFDC) in Aachen, Germany, from 16-20 September 2024. If you’re attending, like this post to stay updated and make sure to catch our presentations and connect with us! Abstracts of the various talks can be found at https://lnkd.in/dZFzXr4t. Here’s our schedule: 🔬 Talk 1: Simultaneous Particle Image Velocimetry and Wave Measurement with Fringe Projection Profilometry Researchers: 🎤 Ali Semati, Adharsh S., R. Jason Hearst & Simen Ådnøy Ellingsen 🗓️ Date: 17 September 2024 ⏰ Time: 10:00am-10:15pm 📍 Location: S01 🔬 Talk 2: Induced Periodicity in Wake Interactions of Porous Discs Researchers: 🎤 Ingrid Neunaber, Srikar Yadala V & R. Jason Hearst 🗓️ Date: 17 September 2024 ⏰ Time: 3:15pm-3:30pm 📍 Location: S06 🔬 Talk 3: Surface Wave Fluctuations Under the Influence of Air-Water Freestream Turbulence Researchers: 🎤 Leon Li, Lea K. Schertenleib & R. Jason Hearst 🗓️ Date: 18 September 2024 ⏰ Time: 5:00pm-5:15pm 📍 Location: S01 🔬 Talk 4: Effects of Turbulence on the Settling and Dispersion of Finite-Size Particles Researchers: 🎤 Yi Hui Tee, Petter Rikheim Benonisen & R. Jason Hearst 🗓️ Date: 19 September 2024 ⏰ Time: 10:15am-10:30pm 📍 Location: H06 🔬 Talk 5: The Flow Field Around an Air-Water Interface Subjected to Incoming Turbulence Researchers: 🎤 Youssef Elashmawi, Leon Li & R. Jason Hearst 🗓️ Date: 20 September 2024 ⏰ Time: 8:45am-9:00am 📍 Location: H07 🔬 Talk 6: Instantaneous Structures of Dissolved Oxygen in an Air-Water Channel for a Turbulent Wind Driven System Researchers: 🎤 Adharsh S. & R. Jason Hearst 🗓️ Date: 20 September 2024 ⏰ Time: 9:45am-10:00am 📍 Location: S01 Most of these research efforts are part of the GLITR & WaTurSheD projects funded by the European Research Council (ERC). Talk 4 is part of the InMyWaves #MSCA grant. #FluidDynamics #EFDC2024 #Research #Conference

What is the effect of turbulence under the ocean surface on the rate of oxygen absorption by the ocean?   To answer this question, researchers in our lab created four different turbulent conditions using the largest water channel active turbulence grid worldwide, located in our lab at NTNU (in attached video). They found that the oxygen absorption rate increased by 30% between the least and the most turbulent cases. To know more, check out their recent publication in Experiments in Fluids titled “The influence of water turbulence on surface deformations and the gas transfer rate across an air–water interface”. It is available #openaccess at https://lnkd.in/dE5zvVrG.   O2 and CO2 absorption by the ocean is an important process because it firstly fosters life under the sea, but also is the largest carbon sequestration process on our planet. Understanding the effect of turbulence on this process is of utmost importance and is the aim of the GLITR project (https://lnkd.in/dPRMunvd) funded by the European Research Council (ERC). This article is just the first step towards that aim. Congratulations to the researchers Pim Bullee, Stefan Weichert, Astri Nore, Leon Li, Simen Ådnøy Ellingsen and R. Jason Hearst. Video credit: Leon Li #Turbulence #ExperimentalFluidMechanics

We are happy to announce that Farid Aligolzadeh, a researcher in our lab, successfully defended his PhD thesis titled "Studies of Turbulence in a von Kármán Swirling Flow" under the supervision of Professor James Dawson. This research aimed to deepen our understanding of turbulence in von Kármán swirling flow, a complex system generated between two counter-rotating disks. Using PIV in our large-scale von Kármán tank, Farid focused on three key areas: 1️⃣ 1. Small-Scale Dynamics: Small-scale vortices were found to play a vital role in the exchange of mass, momentum, and enstrophy with their surroundings. 2️⃣ Free Decay of Turbulence: After removing turbulent forcing, the flow's kinetic energy transitions from a plateau to a classical power-law decay. 3️⃣ Large-Scale Harmonic Motions: A central energetic structure oscillates at twice the impeller frequency at lower Reynolds numbers but disappears at higher ones, where un-synchronized harmonic modulations excite a central vortex oscillating at the modulation frequency. These findings offer valuable insights into turbulence dynamics and pave the way for future research. A big thank you to the committee comprising of Professor Philippe Lavoie, Associate Professor Ramis Örlü and administered by Professor R. Jason Hearst, for their time and efforts. Congratulations to Dr. Farid Aligolzadeh once again for this accomplishment and we look forward to his future contributions to the field! The thesis is available under open access at https://lnkd.in/ddppdmBJ. #PhDDefense #TurbulenceResearch #FluidMechanics #ExperimentalFluidMechanics

In the recently published 10th volume of “Progress in Turbulence”, researchers from our lab contributed four papers discussing some of their experimental research on turbulence. These were also presented in the iTi Turbulence conference in Bertinoro, Italy last year (2023). The titles and links to the papers are below. Congratulations to all the authors! 1. "Comparing hot-wire measurements and particle image velocimetry of turbulence fields generated by an active grid" by Ingrid Neunaber, Masoud Asadi, Leon Li & R. Jason Hearst (https://lnkd.in/dF-gxfu4). 2. "The near- and intermediate-wakes of cylinders under the influence of freestream turbulence" by Leon Li & R. Jason Hearst (https://lnkd.in/dekj9RPb). 3. "A method for identifying the freestream turbulence/turbulent boundary layer interface" by Masoud Asadi, Pim Bulle & R. Jason Hearst (https://lnkd.in/deytaA6A). 4. "Streamwise scalings of the turbulent wake generated by a scaled wind turbine under laminar and turbulent background flows" by Ingrid Neunaber, Michael Hölling & Martin Obligado (https://lnkd.in/dwTjjXXs). #turbulence #experimentalfluidmechanics #windenergy

Check out the recent Letter in Physical Review Fluids titled "Volumetric visualization of vanishing vortices in wind turbine wakes" from members of our laboratory, Johannes Næsset Hillestad, Srikar Yadala V, Ingrid Neunaber, Leon Li, R. Jason Hearst and Nicholas Worth.   The team investigated the "anomalous" spectral peaks in wind turbine wakes observed in previous experimental studies and field tests. By varying the angles-of-attack of the blades and using time-resolved volumetric measurements (shake-the-box PTV), they quantified tip vortex interactions. Their findings reveal that differences in initial vortex strength lead to unexpected frequency distributions in wind turbine wakes.   You can read this open-access letter at https://lnkd.in/dzVwfrhE.