We are pleased to announce our next seminar featuring Francesco Caccia, M.Sc. who is concluding his PhD at the Department of Aerospace Science and Technology at Politecnico di Milano. Join us on February 24th at 14:00 in Lecture Room 003 at ISM (Hermann-Blenk-Str. 37, Braunschweig) for an engaging presentation on his research and the significant implications for ice accretion simulations and ice protection systems.
We look forward to seeing you there for an informative session!
Abstract:
Performing high-fidelity multi-step ice accretion simulations or designing effective ice protection systems for three-dimensional geometries demands significant computational resources. A more efficient approach, particularly for slender rotor blades like those on propellers, wind turbines, and helicopters, is to analyze ice accretion on isolated sections rather than the entire blade. In such sectional simulations, the relative velocity and angle of attack must be prescribed. For smaller particles, lower-fidelity aerodynamic models can be used to compute the induced velocities. For larger droplets, the geometric velocity can be applied without accounting for induction effects. In this seminar, the behavior of droplets in 2D and 3D simulations will be shown and characterized. For droplets with a small sectional Stokes number (Stk≪1), accurate collection efficiency predictions require a correct aerodynamic angle of attack. When Stk≫1, the droplet trajectories become ballistic, leading to two distinct limiting cases - one governed by the aerodynamic angle of attack and the other by the geometric angle of attack. The full 3D solution falls between these limits, potentially reaching the ballistic regime at a different sectional Stokes number. The particle's angle of attack is determined in the stream tube upstream of the rotor disk, where the fluid time scale is significantly larger than that of the blade section. Achieving a ballistic trajectory independent of induced velocities also requires Stk≫1 in the stream tube. Depending on rotor dimensions, this intermediate regime can occur under Appendix-C or Appendix-O conditions.
Bio of Francesco Caccia, M.Sc.:
Francesco Caccia is concluding his PhD at the Department of Aerospace Science and Technology at Politecnico di Milano. There, he obtained his bachelor’s degree in Aerospace Engineering in 2018 and master’s degree in Aeronautical Engineering in 2021. His research focuses on ice accretion and aeroacoustics of rotors. During his PhD, he developed numerical methods to include the effect of blade flexibility in the Lagrangian tracking of water droplets.
We are excited to announce our next ISM seminar featuring Prof. Sven Grundmann, a full professor and head of the Institute of Fluid Mechanics at the University of Rostock. Join us on February 28th at 11:00 AM in Lecture Room 003 at ISM (Hermann-Blenk-Str. 37, Braunschweig) for an insightful presentation on his research.
We look forward to seeing you there for what promises to be an engaging discussion!
Title: Recent Advancements in MRI-Based Measurements in Turbulent Flows
Abstract:
Magnetic Resonance Imaging (MRI) has emerged as a powerful tool for non-invasive, three-dimensional flow measurement, providing unique insights into the complexities of turbulent flows. Recent advancements in MRI-based techniques have significantly expanded the applicability of this measurement method to turbulent flow analysis. These developments include extending the measurable velocity range, improving the precision of Reynolds stress measurements, enhancing temperature and concentration measurements, and enabling applications to turbulent multiphase flows.
This presentation reviews the latest advancements in MRI technology applied to turbulent flow studies, highlighting innovative pulse sequences and advanced reconstruction algorithms developed for fluid dynamics research. The talk will discuss the successful application of these advancements to canonical turbulent flows, such as pipe and channel flows, as well as to more complex geometries relevant to engineering and biomedical contexts. This talk aims to showcase the potential of MRI as a highly productive tool for studying turbulent flows and for improving and validating computational fluid dynamics methods.
Bio of Prof. Sven Grundmann:
Prof. Grundmann’s academic journey began with a degree in Mechanical Engineering from Technische Universität Darmstadt in 2003. He completed his PhD at the same university in 2008 under the guidance of Prof. Dr.-Ing. C. Tropea, focusing on fluid mechanics and aerodynamics. Following his PhD, Prof. Grundmann was awarded a DAAD Postdoctoral Fellowship and spent 2009-2010 at Stanford University, USA, collaborating with Prof. John K. Eaton at the Center for Turbulence Research. Returning to Germany, he led a young research group at the Center of Smart Interfaces, where he explored topics like plasma actuators for transition control and magnetic resonance imaging (MRI) in thermo-fluids engineering. In 2014, Prof. Grundmann earned his habilitation (Venia Legendi) in Fluid Mechanics from TU Darmstadt and, since 2015, has served as a full professor and head of the Institute of Fluid Mechanics at the University of Rostock. He has been a member of the faculty council since 2015, academic dean since 2018, and a member of the DFG Senate and Grants Committee on Research Training Groups since 2020. Prof. Grundmann’s research covers a broad spectrum, including flow control, active transition control, dielectric barrier discharge actuators, and the use of MRI in flow measurements.
On Friday 7th of February, we had the pleasure of hosting Prof. Nikolas Aksamit, an Associate Professor at UiT – The Arctic University of Norway, for an enlightening seminar titled "Insights into Atmospheric Dynamics with Frame-Indifferent Fluxes and Structures." In his talk, Prof. Aksamit addressed the complexities of multi-scale transport and mixing processes in Earth’s atmosphere, emphasizing the critical role of coherent structures in organizing turbulent flows. He shared recent theoretical advancements that allow for precise diagnostics of these structures and their impact on atmospheric dynamics. By employing a frame-indifferent approach, Prof. Aksamit highlighted important trends in momentum and heat transport across various simulations, revealing the potential of this methodology in enhancing our understanding of the atmospheric boundary layer. His interdisciplinary research sheds light on the intricate behaviors of geophysical fluid flows, paving the way for future studies that could significantly advance our grasp of turbulent processes in the atmosphere. We thank Prof. Aksamit for his valuable insights and engaging discussion!
Stay tuned for future ISM seminars!
An exciting new project has opened up at the ISM! Find the advertisement in the Vacancies section!
We are pleased to announce that the Institute of Fluid Mechanics is hosting the Second TRACES Training School this week, from Monday, 23 September to Friday, 27 September. TRACES is a European Joint Doctoral Network focused on the challenging topic of aircraft icing.
The event at TU Braunschweig will feature a combination of lectures by network experts and experimental labs on measurement techniques for icing and multiphase flow. Additionally, TRACES doctoral researchers will present their projects during dedicated poster sessions.
Several lectures by TRACES partners are open to external participants; these public lectures are marked in green on the official programme, https://traces-project.eu/second-training-school/
Stay updated on the latest network activities by visiting the official website: https://traces-project.eu/
An exciting new project has opened up at the ISM! Find the advertisement in the Vacancies section!
An exciting new project has opened up at the ISM! Find the advertisement in the Vacancies section!
We are pleased to announce that Dr. Nils van Hinsberg from DLR Göttingen will give his new Master´s lecture "Flow-induced Vibrations of Bluff-body Structures" at the Institute of Fluid Mechanics in winter term 2024/25.
Description:
The lecture series focuses on the physical understanding, mathematical prediction, and possible prevention of different types of vortex- and motion-induced vibrations that result from massive flow separation, and the ensuing (partly catastrophic) aero- and hydroelastic problems that may occur.
Topics:
static and dynamic aeroelastic problems, steady and unsteady aerodynamics of bluff bodies, potential theory, boundary layer behaviour and detached flows, properties and phenomena of vortex - induced and motion-induced vibrations, differences between forced and free structural oscillations, one- and two- degrees-of-freedom galloping, (wake-induced) flutter, turbulence-induced buffeting, linear and non-linear quasi-steady and unsteady modelling of structural oscillations, methods of prevention and damping
lecturer: Dr.-Ing. Nils van Hinsberg
when: Monday, 7.10.24 - Friday, 11.10.24, 9.00 - 12.00 and 14.00 - 17.00
location: lecture room 003, Hermann-Blenk-Str. 37, 38108 Braunschweig
An exciting new project has opened up at the ISM! Find the advertisement in the Vacancies section!
We had the privilege of hosting Moira Barnes on 11th of April. Moira Barnes recently completed her Master of Applied Science from the Department of Mechanical Engineering at Queen’s University, working with Prof. Rival. Her research focuses on exploring unsteady nonNewtonian flows of dense suspensions and shear-thinning fluids using novel experimental techniques to better understand cardiovascular flows. Moira graduated with a BSc in Mechanical Engineering (first-class honours) in 2022 also from Queen’s University, after completing an undergraduate thesis on non-Newtonian vortex dynamics.
She shared valuable insights from her master's thesis, which is titled "Persistence of vortical structures in dense suspensions and shearthinning fluids: Characterization of vortex formation and evolution."
An exciting new project has opened up at the ISM! Find the advertisement in the Vacancies section!
On Friday at our institute, we had the privilege of hosting Dr. Ing. Daniel Münning, a professional in the automotive industry. Dr. Münning possesses a Mechanical Engineering background with a specialization in Automotive Engineering from RWTH Aachen University.
Daniel Münning furthered his expertise with a doctoral degree at Technische Universität Braunschweig and Volkswagen, focusing on optimizing combustion engines for hybrid vehicles. Over the past decade at Volkswagen AG, Daniel has held various roles, from doctoral research in hybrid concept development to leading projects in cutting-edge technologies like Mobile Online Service and Travel Assist. Currently, he's deeply involved in functional management and realization, particularly focusing on Travel Assist.
He provided an insightful overview of the SAE Level 2 Driver Assistance function and the associated sensors in ISM Seminar on Friday. Following a brief discussion on regulations such as UN R79 and safety concept methodologies, the presentation delved into examples illustrating the testing efforts required to secure series approval for implementing the function in millions of cars globally.
Keep an eye on our website for the latest updates on forthcoming events and seminars.
The Instititute of Fluid Mechanics offers the new course "Biological Fluid Dynamics" in summer semester.
Description:
We seek motivated students from a broad range of disciplines eager to join us in this
inaugural course at TU Braunschweig. We will study topics that cross traditional
boundaries, and therefore look forward to the participation of students from STEM
fields ranging from Biology, Chemistry, Engineering, Medicine, Physics, to name but
a few. Via active participation in this course students will, for instance, be able to:
• Conduct analysis and/or design optimization through the lens of Evolution, and subsequently perform validation against theory (or experiment);
• Understand and manipulate the governing equations for unsteady flows across a broad range of scales, e.g. from cellular motility to bio-propulsion;
• Solve problems relating to pulsatile internal flows (with e.g. curvature, bifurcations) as well as to unsteady aerodynamics/hydrodynamics; and
• Apply qualitative and quantitative reasoning to support real-world biomedical or biologically-inspired designs (e.g. biomedical devices, physiological mechanisms, imaging techniques and autonomous robots).
lecturer: Prof. Dr.-Ing. David E. Rival
language: English
when: Tuesdays, 10:30-12:00 (lecture) & 12:15-13:00 (tutorial)
location: Institute of Fluid Mechanics, H003, Hermann-Blenk-Str. 37, Braunschweig
first class: Tuesday, 02.04.2024
textbook: Rival, D., 2022, Biological and Bio-Inspired Fluid Dynamics – Theory and Application, Springer-Nature
More information: stud.ip
On Friday some of our scientists have visited the "Laboratory for Fluid Physics, Pattern Formation and Biocomplexity (LFPB)" at the Max Planck Institute for Dynamics and Self-Organization in Göttingen. Led by Professor Eberhard Bodenschatz, the lab focuses on diverse areas including biological fluid dynamics, particles in fluids, turbulence, and atmospheric physics. Discussions with the LFPB team, including experts Dr. Claudia Bruner and Dr. Mohsen Bagheri, along with the visit to their experimental facilities, were very fruitful. We look forward to future exchanges and joint endeavors in fluid mechanics and related fields.
Last Friday at our Institute, we had the honor of welcoming Steffen Hüttig, an Application Engineer and PhD candidate at Volkswagen AG, specializing in Brake and Glazing Systems, and Deep Analysis.
Steffen Hüttig's journey in the automotive industry is marked by notable achievements. He pursued a Ph.D. in Optical Metrology at Volkswagen AG, Wolfsburg, from January 2020 to September 2023. His earlier experience includes serving as a Calibration Engineer for Gasoline Powertrains at FEV Europe GmbH, Fellbach, from July 2018 to February 2019. In 2018, he earned his Master of Science in Automotive Engineering from Technische Universität Braunschweig.
The highlight of the seminar was the presentation on the topic of on-road flow quantification using a Large Scale Stereo-PIV setup where the "ring of fire" configuration, a unique approach was applied to road vehicles. Participants had the opportunity to explore the intricate details of this innovative technology, highlighting its implications for fluid mechanics, particularly in the automotive sector.
Steffen Hüttig's seminar offered a glimpse into the future of large scale PIV applied to automotive engineering, highlighting how advanced technologies are influencing our understanding of on-road flow dynamics. We sincerely thank Steffen Hüttig for sharing his knowledge and experience with us. These seminars play a crucial role in encouraging collaboration and staying informed about the latest developments in our continuously evolving field.
Stay tuned to our website for updates on upcoming events and seminars as we persist in exploring the forefront of fluid mechanics and its applications in various industries.