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Academic Staff Head of the group Prof. dr. Olindo Isabella LB 03.430 +31 (0)15 27 81947 O.Isabella@tudelft.nl Professor Prof. dr. Miro Zeman LB 03.400 +31 (0)15 27 82409 M.Zeman@tudelft.nl Professor Prof. dr. Arno Smets LB 03.420 +31 (0)15 27 88739 A.H.M.Smets@tudelft.nl Associate Professor Dr. R.A.C.M.M. van Swaaij LB 03.410 +31 (0)15 27 87259 R.A.C.M.M.vanSwaaij@tudelft.nl Part-time Professor Prof. dr. Arthur Weeber LB 03.250 +31 (0)15 27 88873 A.W.Weeber@tudelft.nl Part-time Professor Prof. dr. Ivan Gordon LB 03.250 +31 (0)15 27 89288 I.M.F.Gordon@tudelft.nl Assistant Professor Dr. Hesan Ziar LB 03.490 +31 (0)15 27 81907 H.Ziar@tudelft.nl Assistant Professor Dr. ir. Rudi Santbergen LB 03.500 +31 (0)15 27 84425 R.Santbergen@tudelft.nl Assistant Professor Dr. Moumita Rana LB 03.460 +31 (0)15 27 84891 M.Rana@tudelft.nl Assistant Professor Dr. Luana Mazzarella LB 03.500 +31 (0)15 27 88885 L.Mazzarella@tudelft.nl Assistant Professor Dr. Malte Ruben Vogt LB 03.460 +31 (0)15 27 87032 M.R.Vogt@tudelft.nl Lecturer Dr. Robin Vismara LB 03.680 +31 (0)15 27 88902 R.Vismara@tudelft.nl Supporting Staff Manager ESP Lab Sandra Dordevic LB 01.850 +31 (0)15 27 83279 A.Dordevic@tudelft.nl Interim Department Manager Marc Magrijn LB 03.380 +31 (0)15 27 82011 m.c.magrijn@tudelft.nl Management Assistant Brenda Reyes Munoz LB 03.610 +31 (0)15 27 85443 B.ReyesMunoz@tudelft.nl Lab manager Martijn Tijssen DI 01.010 +31 (0)15 27 86278 M.Tijssen@tudelft.nl Technician Bernardus Zijlstra LB 02.900 +31 (0)15 27 89698 B.Zijlstra@tudelft.nl Technician Stefaan Heirman DI 01.010 +31 (0)15 27 87616 S.G.M.Heirman@tudelft.nl Technician Shuang Hao LB 02.900 +31 (0)15 27 83733 S.Hao-2@tudelft.nl Technician / Researcher Dr. Engin Özkol EKL 01.120 +31 (0)15 27 88403 E.Ozkol@tudelft.nl Technician / Researcher Dr. Paul A. Procel Moya LB 03.440 +31 (0)15 27 88871 P.A.ProcelMoya@tudelft.nl Technician Tim Velzeboer EKL 01.120 +31 (0)15 27 82999 T.Velzeboer@tudelft.nl Post-Docs Dr. Hiroki Nakajima LB 02.900 +31 (0)15 27 81308 h.nakajima@tudelft.nl Dr. Engin Torun LB 02.840 +31 (0)15 27 81767 e.torun@tudelft.nl Dr. Alestair Wilson LB 03.450 +31 (0)15 27 82614 A.T.Wilson@tudelft.nl Dr. Paula Perez Rodriguez LB 03.440 +31 (0)15 27 85657 P.PerezRodriguez-1@tudelft.nl Dr. Chengjian Xu LB 03.450 +31 (0)15 27 83742 C.Xu@tudelft.nl Dr. Sreejith Koorthedath Pullayikody LB 02.480 +31 (0)15 27 87870 S.KoorthedathPullayikody@tudelft.nl Dr. Zain Ul Abdin LB 03.480 +31 (0)15 27 83159 Z.UlAbdin@tudelft.nl Dr. Yifeng Zhao LB 03.480 +31 (0)15 27 88876 Y.Zhao-4@tudelft.nl Dr. Hiroki Nakajima LB 02.900 +31 (0)15 27 81308 h.nakajima@tudelft.nl Dr. Engin Torun LB 02.840 +31 (0)15 27 81767 e.torun@tudelft.nl Dr. Urvashi Bothra LB 03.490 +31 (0)15 27 81220 u.bothra@tudelft.nl PhD students Manvika Singh +31 (0)15 27 88875 M.Singh-1@tudelft.nl Yilong Zhou LB 03.480 +31 (0)15 27 88909 Y.Zhou-15@tudelft.nl (V.) Arturo Martinez Lopez LB 03.450 +31 (0)15 27 88879 V.A.MartinezLopez@tudelft.nl Alba Alcañiz Moya LB 03.260 +31 (0)15 27 82976 A.AlcanizMoya@tudelft.nl David van Nijen LB 03.260 +31 (0)15 27 89258 D.A.vanNijen@tudelft.nl Jin Yan LB 03.450 +31 (0)15 27 89649 J.Yan-6@tudelft.nl Afshin Nazer LB 02.840 +31 (0)15 27 81712 A.Nazer@tudelft.nl Govind Padmakumar LB 02.480 +31 (0)15 27 84542 G.Padmakumar@tudelft.nl Federica Saitta LB 02.480 +31 (0)15 27 89024 F.S.Saitta@tudelft.nl Jonathan Henzel LB 02.480 +31 (0)15 27 85283 J.A.Henzel@tudelft.nl Katarina Kovačević LB 02.490 +31 (0)15 27 85849 K.Kovacevic@tudelft.nl Youri Blom LB 03.480 +31 (0)15 27 89733 Y.Blom@tudelft.nl Alex Katsikogiannis LB 02.490 +31 (0)15 27 85921 O.A.Katsikogiannis@tudelft.nl Reinder Boekhoff LB 03.260 +31 (0)15 27 86380 R.K.Boekhoff@tudelft.nl Sathya Shanka Vasuki LB 03.450 +31 (0)15 27 86944 S.S.S.ShankaVasuki@tudelft.nl Peer Sluijs LB 03.440 +31 (0)15 27 85505 P.J.T.Sluijs@tudelft.nl Yi Zheng LB 02.840 +31 (0)15 27 81492 y.zheng-8@tudelft.nl Mare Dijkstra LB 03.260 +31 (0)15 27 81066 m.s.dijstra@tudelft.nl Researchers Maarten Verkou LB 02.840 +31 (0)15 27 88904 M.H.Verkou@tudelft.nl Juan Camilo Ortiz Lizcano LB 03.260 +31 (0)15 27 81651 J.C.OrtizLizcano@tudelft.nl Dr. Carlos M. Ruiz Tobon LB 03.450 +31 (0)15 27 88898 C.M.RuizTobon@tudelft.nl Guest PhD students Liqi Cao LB 03.440 +31 (0)15 27 84958 L.Cao-3@tudelft.nl Haoxu Wang LB 02.480 +31 (0)15 27 84097 H.Wang-18@tudelft.nl Yingwen Zhao LB 02.490 +31 (0)15 27 88432 Y.Zhao-9@tudelft.nl Wenxian Wang LB 02.490 +31 (0)15 27 85272 W.Wang-24@tudelft.nl Former Members Dr. Nasim Rezaei Dr. Thierry de Vrijer Dr. Klaas Bakker Daragh O'Connor Sho Aonuki Dr. Andres Calcabrini Dr. Guangtao Yang Dr. Gianluca Limodio Dr. Mirco Mutillo Dr. Can Han Dr. Mehmet Karaman

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NWO grants funding for innovative research on physical experimental environments

How to move from experiment to mainstream? A consortium led by professor Tamara Metze, has been awarded a prestigious grant from the Netherlands Organisation for Scientific Research (NWO). In search for pathways toward more sustainable futures, Metze and her team will explore how various innovations in field labs such as The Green Village, in urban living labs such as Engy Lab South-East in Amsterdam, and in all sorts of citizens’ initiatives, can be mainstreamed and make more impact on sustainability transitions. Pilot paradox The project ‘From EXperiment to sustainable change: TRAnsformative methodologies for Innovation and learning’ (EXTRA) seeks to overcome a persistent “pilot paradox”. In this paradox, much experimentation takes place but long-term systemic impact remains difficult. Researchers together with all sorts of change makers will synthesise existing knowledge on how to mainstream, upscale, spread, broaden and deepen developed innovations. Tamara Metze: ‘I am excited to unravel what are effective ways of cocreation that lead to mainstreaming the positive changes made in experimental environments. We will figure out how learning and innovation can lead to lasting changes in regulations, policies, and financial systems and the biophysical environment.’ Tamara Metze Read the NWO press release Actionable tools The project is crucial for accelerating sustainability transitions. By refining methodologies for mission-driven experimentation and develop hands on tools for all sorts of change-makers, it will be easier to mainstream the sustainable lessons and innovations. ‘These tools will not only aid grassroots innovators but also influence institutional and organisational structures, ensuring that lessons learned from experiments are better anchored in policies, regulations, and organisations’, explains Metze. The project will employ a transdisciplinary action research approach, bringing together knowledge from various disciplines and policy domains. By co-creating solutions with public and private partners, the research will have an immediate impact. In the long term, the project aims to build a more efficient innovation ecosystem, contributing to more impactful and sustainable outcomes for both society and the environment. Projectpartners TU Delft, VU Amsterdam, Wageningen University & Research, Hogeschool van Amsterdam, Erasmus Universiteit Rotterdam, Hogeschool Rotterdam, The Green Village, AMS Institute; PBL Planbureau voor de Leefomgeving, WoonFriesland, Dijkstra Draisma, Provincie Noord-Holland, Ministerie van Binnenlandse Zaken, PRICE / Almere, BouwLab, Alliantie Samen Nieuw-West, Innovation Quarter.

Unusual waves grow way beyond known limits

Waves that come from multiple directions are extremer than extreme. These remarkable deep-sea waves can be four times steeper than what was previously imagined, as is shown in research by TU Delft and other universities that was published in Nature today. A long time ago, stories were told of mysterious rogue waves that materialised out of nowhere and could topple even the largest ships. These waves lost their mythical character when the first rogue wave was recorded at the Draupner platform in the North Sea. In 2018, Ton van den Bremer and his colleagues at the Universities of Edinburgh and Oxford managed to recreate the Draupner wave in the lab for the first time ever, and this opportunity to study freak waves closely produced unexpected insights. Multiple waves push up water New research by the research consortium now shows that these remarkable waves do not break when traditional theories hold they should, the secret behind which lies in how they arise. Ton van den Bremer, expert on fluid mechanics at TU Delft and led the study, explains: “When most people think of waves, they think of the rolling waves you’d find on a beach. The type of wave we studied occurs in open water and arises when waves coming from multiple directions come together. When these waves with a high directional spread converge, the water is pushed upwards, forming a partially standing wave. An example of this is known as a crossing wave. How crossing waves arise Under certain conditions at sea, waves from multiple directions occur. This can happen in a place where two seas meet, or where winds suddenly change direction, as in a hurricane. When waves from two directions meet, a cross wave occurs, provided their directions are far enough apart. The study also shows that the further apart the directions are, the higher the resulting cross-wave. Travelling waves break when they reach a certain limit, this is when they reach their maximum steepness. The study shows that waves with a multidirectional spreading can get as much as 80% steeper than this limit before they start breaking, which means they can get almost twice as high as ‘normal waves’ before they start to break. Travelling wave (l) and a wave with high directional spreading (r) Breaking waves that grow Next, the researchers found another highly unusual phenomenon that defies existing theories, a phenomenon that is unprecedented according to Van den Bremer: “Once a conventional wave breaks, it forms a white cap, and there is no way back. But when a wave with a high directional spreading breaks, it can keep growing.” The study shows that these enormous waves can grow to twice their original steepness while breaking, which is already twice bigger than the conventional limit. Together, the waves can grow four times steeper than previously thought possible. Damage to offshore structures The knowledge that multidirectional waves can become as much as four times larger than was deemed possible can help design safer marine structures. "The three-dimensionality of waves is often overlooked in the design of offshore wind turbines and other structures in general; our findings suggest this leads to designs that are less reliable", says Mark McAllister of the University of Oxford, who led the experiments and is now a senior scientist at Wood Thilsted. Innovative vertical sensors made it possible to take accurate 3D measurements of waves. Innovative 3D measurement method A 3D measurement method developed in the FloWave lab paved the way for these new insights. “Conventional 2D wave measurement methods weren’t up to the task”, Van den Bremer explains, which is why the research group designed a new way to create 3D wave measurements. Ross Calvert of the University of Edinburgh: “This is the first time we've been able to measure wave heights at such high spatial resolution over such a big area, giving us a much more detailed understanding of complex wave breaking behaviour." FloWave Ocean Energy Research Facility in Edinburgh. The circular basin has a diameter of 25 metres and can be used to generate waves from multiple directions. Header image by: Fabien Duboc