RESEARCH
I’m presently working at laboratoire FAST (bureau 1.26). Up until 2022, I was working at LIMSI, now LISN previously I worked . My research covers various topics in fluid mechanics and magnetohydrodynamics. Click on the thumbnail pictures below, to navigate to dedicated webpages that give some details on my work.
A publication list can be found below with pdf downloads that are for personal use only. Contact me at wietze.herreman@universite-paris-saclay.fr for any question related to my research. You can also visit my researchgate profile.
Flows in liquid metal batteries
Liquid metal batteries are composed of three layers of conducting fluids. When electrical currents passing through the cell get to intense, flows can devellop inside the batteries. We study Tayler instability, metal pad roll instability and electro-vortex flow.
Collaboration : C. Nore, S. Bénard (LISN, Orsay), J.-L. Guermond (TAMU, College Station), L. Cappanera (U. Phoenix) , N. Weber, T. Weier, G.M. Horstmann, P. Personnettaz (HZDR, Dresden)
Wave-floater interaction
Small floaters, such as as plastic pollution, placed in propagating gravity waves drift and rotate slowly on long time-scales. We study this slow motion using laboratory experiments and asymptotic theory. (new webpage soon available)
Collaboration : F. Moisy, B. Dhote (FAST, Orsay)
Orbital Sloshing
Orbital sloshing is the flow that occurs whenever fluids with a free surface are being displaced along circular paths. We have done a few experiemental and theoretical studies on this flow.
Collaboration : F. Moisy, J. Bouvard (FAST, Orsay), G.M. Horstmann (HZDR, Dresden)
Optimized dynamos
Using variational optimization methods, we find the most efficient steady flows than can act as dynamos in cubes and spheres. We can also measure the minimal magnitude of flow perturbations that can trigger dynamo in shear flows.
Collaboration : L. Chen (U. Durham), A. Jackson, K. Li, J. Luo (ETH Zurich), P. Livermore (U. Leeds)
Dynamos driven by rapid waves
Inertial waves are examples of rapidly varying flows. Dynamos driven by such flows can be modelled using a mean field dynamo theory constructed on time-averages. When magnetic diffusivity is low, fast waves drive dynamos through their Stokes drift.
Collaboration : P. Lesaffre (LERMA, Paris)
Inertial waves in rotating flows
During my Phd at IRPHE (Marseille), I have studied the elliptical (tidal) instability both experimentally and theoretically. Some follow-up studies later on similar inertial wave instabilities due to libration.
Collaboration; P. Le Gal, S. Le Dizès, M. Le Bars (IRPHE, Marseille), D. Cébron (ISTERRE, Grenoble), S. Vantieghem (U. Coventry)
PUBLICATION LIST
1. Magnetic field effects on viscous fingering of a ferrofluid in a radial Hele-Shaw cell. (2004) W. Herreman, P. Molho, S. Neveu. J. Magn. Magn. Mat., 289, 356-359.
2. Magnetic field induced by elliptical instability in a rotating spheroid. (2006) L. Lacaze, W. Herreman, M. Le Bars, S. Le Dizes, P. Le Gal. Geophys. Astrophys. Fluid Dyn., 100, 299-317
3. On the effects of imposed magnetic field on the elliptical instability in rotating spheroids. (2009) W. Herreman, M. Le Bars, P. Le Gal. Phys. Fluids, 21 (4), 046602
4. Elliptical instability in rotating cylinders: liquid metal experiments under imposed magnetic field. (2010) W. Herreman, D. Cebron, S. Le Dizes, P. Le Gal. J. Fluid. Mech., 661, 130-158
5. Stokes drift dynamos. (2011) W. Herreman, P. Lesaffre. J. Fluid. Mech., 679, 32-57
6. Influence of high-permeability discs in an axisymmetric model of the Cadarache dynamo experiment. (2012) A. Giesecke, C. Nore, F. Stefani, G. Gerbeth, J. Léorat, W. Herreman, F. Luddens, J.-L. Guermond. NJP, 14, 053005.
7. Libration-driven multipolar instabilities. (2014) D. Cébron, S. Vantieghem, W. Herreman. J. Fluid Mech., 739, 502-543.
8. Tayler instability in liquid metal columns and liquid metal batteries. (2015) W. Herreman, C. Nore, L. Cappanera, J.-L. Guermond. J. Fluid Mech., 771, 79-114
9. Optimal dynamo action by steady flows confined to a cube. (2015) L. Chen, W. Herreman, A. Jackson. J. Fluid Mech. 783, 23-45
10. Minimal flow perturbations that trigger kinematic dynamo in shear flows. (2016) W. Herreman, J. Fluid Mech., 795, R1
11. Metal pad roll instability in liquid metal batteries. (2017) N. Weber, P. beckstein, V. Galindo, W. Herreman, C. Nore, F. Stefani, T. Weier. Magnetohydrodynamics, 53 (1), 3-13
12. Sloshing instability and electrolyte layer rupture in liquid metal batteries. (2017) N. Weber, P. Beckstein, W. Herreman, G.M. Horstmann, C. Nore, F. Stefani, T. Weier. Phys. Fluids, 29 (5), 054101
13. Mean mass transport in an orbitally shaken cylindrical container. (2017) J. Bouvard, W. Herreman, F. Moisy. Phys. Rev. Fluids, 2, 084801.
14. Momentum-based approximation of incompressible multiphase fluid flows. (2017) L. Cappanera, J.-L. Guermond, W. Herreman, C. Nore. Int. J. Numer. Meth. Fluids, 1–23.
15. The optimal kinematic dynamo driven by steady flows in a sphere. (2018) L. Chen, W. Herreman, K. Li, P. W. Livermore, J. W. Luo, A. Jackson. J. Fluid Mech., 839, 1-32
16. Minimal flow perturbations that trigger mean field dynamos in shear flows. (2018) W. Herreman. J. Plasma Phys., 84 (3), 735840305
17. Counter-rotation in an orbitally shaken glass of beer. (2018) F. Moisy, J. Bouvard, W. Herreman. Europhys. Lett., 122 (3), 34002
18. Perturbation theory for metal pad roll instability in cylindrical reduction cells. (2019) W. Herreman, C. Nore, L. Cappanera, J.-L. Guermond, N. Weber, G.-M. Horstmann. J. Fluid Mech., 878, 598-646
19. Numerical simulations of electro-vortex flows in cylindrical fluid layers and liquid metal batteries. (2019) W. Herreman, C. Nore, P. Ziebell Ramos, L. Cappanera, J.-L. Guermond, N. Weber, Phys. Rev. Fluids, 4 (113702).
20. Damped wave theory for orbitally shaken cylindrical containers. (2020) G.-M. Horstmann, T. Weier, W. Herreman, J. Fluid Mech., 891, A22
21. Solutal buoyancy and electrovortex flow in liquid metal batteries. (2020) W. Herreman, S. Bénard, C. Nore, P. Personnettaz, L. Cappanera, J.-L. Guermond, Phys. Rev. Fluids, 5 (074501).
22. Efficient mixing by swirling electrovortex flows in liquid metal batteries. (2021) W. Herreman, C. Nore, L. Cappanera, J.-L. Guermond, J. Fluid Mech. 915, A17.
23. Feasibility of metal pad roll instability experiments at room temperature. (2021)C. Nore, L. Cappanera, J.-L. Guermond, T. Weier, W. Herreman, Phys. Rev. Lett. 126, 184501.
24. Numerical simulations of swirling electrovortex flows in cylinders. (2022) S. Bénard, W. Herreman, J.-L. Guermond, C. Nore. J. Fluid Mech. 950, A28
25. Magnetic field based finite element method for magneto-static problems with discontinuous electric potential distributions. (2023) S. Bénard, L. Cappanera, W. Herreman, C. Nore. Comptes Rendus de la Mécanique (351), S1
26. Stability theory for metal pad roll in cylindrical liquid metal batteries. (2023) W. Herreman, L. Wierzchalek, G.M. Horstmann, L. cappanera, C. Nore. J. Fluid Mech. 962, A6
(preprint submitted to JFM) Preferential orientation of floaters drifting in water waves. W. Herreman, B. Dhote, L. Danion, F. Moisy.