Tomas Rosén

I am a docent in Fibre and Polymer Science, a physicist and a fluid dynamicist with a great passion to explore the fundamental nature of complex flows in industrial and biomedical applications from nano- to macroscale.

Currently, I am investigating the flows of biobased nanomaterials in material processes using both X-ray scattering experiments and numerical simulations.

My expertise includes various tools for investigating multiphase fluid flows and nanoscale materials, mainly experimental X-ray techniques enabled by the new generation of synchrotron light sources. These include Small/wide angle X-ray scattering (SAXS/WAXS), X-ray Photon Correlation Spectroscopy (XPCS), X-ray tomographic microscopy (XTM) and X-ray multi projection imaging (XMPI). I also have deep knowledge of lab-based techniques using visible light such as Polarized Optical Microscopy (POM), as well as Static and Dynamic light scattering (SLS/DLS).

To analyze experimental results, my approach is to develop digital twins of experiments incorporating 1) direct numerical simulations of processes, mainly using computational fluid dynamics (CFD) via the lattice Boltzmann method (LBM); 2) simulations of light-matter interactions and scattering data; 3) reduced mathematical models via analysis of non-linear dynamics, bifurcations and routes to chaotic dynamics; 4) AI and machine learning.

 

Education

Royal Institute of Technology, Stockholm, Sweden (KTH)
Master of Science in Engineering Physics 2011
Paul Scherrer Institut, Villigen, Switzerland (PSI)
Thesis: Determination of water saturation dependent gas transport properties of PEFC gas diffusion layers via the Lattice Boltzmann method.

Professional history

Royal Institute of Technology (KTH)
PhD student, KTH Mechanics 2011-2016
Thesis: Angular dynamics of non-spherical particles in linear flows related to production of biobased materials.

Stony Brook University (SBU)
Postdoctoral researcher 2017-2019

Treesearch, Royal Institute of Technology (KTH)
Researcher 2019-

Docent in Fibre and Polymer Science 2025-

Research and Professional Activities

Rotation of non-spherical particles in canonical flows
Advanced nano- and macroscale characterization of flowing materials