Can we design turbulence? Turbulence is everywhere and yet our fundamental understanding and capabilities to control it remain limited. It is a remarkable property of turbulence that, rather irrespectively of the large-scale forcing mechanism, it rapidly tends to restore a universal (homogeneous and isotropic) state at smaller scales. This tendency to universality severely hinders our capability to modulate turbulence by acting on few (large-scale) degrees of freedom. To address such questions a large research program has been set up to investigate the possibility to shape turbulence with particles. This program will enter an unexplored terrain and design non-universal turbulence employing “smart” particles (either chiral, magnetic or with both properties) capable of applying appropriate small-scale forcing. The particles will be designed to interact with helicity and small-scale structures, thus touching turbulence at its own core. It will moreover shed light on the physics of complex-shaped particles dispersed in turbulent flows as occurring in nature, take e.g. pollen, plant seeds, fish, bacteria, algae, phytoplankton or sediments. Deeper understanding of these systems will open up the way to technological applications.
In this project, the PhD candidate will investigate numerically the role of magnetic particles in turbulence at low and high densities with the possibility to steer the turbulence via external (time-dependent) magnetic fields. The main goal of this project is to perform a quantitative numerical investigation of the dynamics and of the feedback of magnetic particles and aggregates of particles on turbulence, including statistical correlations between particle position and flow field and the statistical properties of the turbulent flow affected by magnetic particles. The students will implement a numerical (point-wise) modeling of magnetic particles with two-way hydrodynamic coupling between particles and flow. Classical pseudo-spectral codes with point-wise particles and magnetic forces will be developed and adapted to investigate the dynamics and the influence of magnetic particles on turbulence. Numerical simulations will allow exploring the wide spectrum of (magnetic) forcing protocols (intensity, frequency, etc.) as well as the influence of particles with different physical properties like density, shape, and size. Strong interaction and exchange of data with parallel PhD projects on chiral particles in turbulence and experimental studies of such systems is anticipated.
This subproject will be carried out within the Fluids and Flows group at the Department of Applied Physics (https://www.tue.nl/en/research/research-groups/fluids-and-flows/) of Eindhoven University of Technology. The PhD candidate will be supervised by prof. F. Toschi, prof. H.J.H. Clercx and dr. R.P.J. Kunnen. This project is part of a larger NWO-Groot program in collaboration with University of Twente that encompasses also international partners.
We are looking for an enthusiastic PhD-student with an excellent background in fluid dynamics and turbulence, and a strong affinity with (HPC) numerical techniques. You have an MSc in (applied) physics, applied Mathematics or mechanical engineering. As an ideal candidate you should be able to work in a team. You also have good written and oral communication skills in English.
Information about the terms of employment and being a PhD candidate at TU/e can be found on the website https://www.tue.nl/en/working-at-tue/phdpdeng/
Prof. F. (Federico) Toschi and Dr. H.J.H. (Herman) Clercx
Department of Applied Physics, group Fluids and Flows
Eindhoven University of Technology, The Netherlands
If interested, please send an application letter, CV, grade list and names and contact details of at least one senior scientist able and willing to provide references. Please note that you can upload 1 document of 10 MB. So if you have more than 1 document you will have to combine them.
We aim for a starting date of December 1st 2020 or earlier. Screening of applications will start as soon as applications are received and will continue until the position has been filled.
Please send us your application by using the 'apply for this job'-button on the TU/e website.
Applications by e-mail are not accepted.