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- Ugis Lacis, N. Brosse, +4 authors Samae Bagheri
- Nature communications
- 2014

Plants and animals use plumes, barbs, tails, feathers, hairs and fins to aid locomotion. Many of these appendages are not actively controlled, instead they have to interact passively with the surrounding fluid to generate motion. Here, we use theory, experiments and numerical simulations to show that an object with a protrusion in a separated flow drifts… (More)

- Tomas Rosén, Minh Do-Quang, Cyrus K. Aidun, Fredrik Lundell
- Physical review. E, Statistical, nonlinear, and…
- 2015

This work describes the inertial effects on the rotational behavior of an oblate spheroidal particle confined between two parallel opposite moving walls, which generate a linear shear flow. Numerical results are obtained using the lattice Boltzmann method with an external boundary force. The rotation of the particle depends on the particle Reynolds number,… (More)

- Athanasios Alexandris, Fredrik Lundell
- Canadian Medical Association journal
- 1968

- Karl M. O. Håkansson, Andreas B. Fall, +8 authors L Daniel Söderberg
- Nature communications
- 2014

Cellulose nanofibrils can be obtained from trees and have considerable potential as a building block for biobased materials. In order to achieve good properties of these materials, the nanostructure must be controlled. Here we present a process combining hydrodynamic alignment with a dispersion-gel transition that produces homogeneous and smooth filaments… (More)

- Mahiar M Hamedi, Alireza Hajian, +5 authors Lars Berglund
- ACS nano
- 2014

It is challenging to obtain high-quality dispersions of single-wall nanotubes (SWNTs) in composite matrix materials, in order to reach the full potential of mechanical and electronic properties. The most widely used matrix materials are polymers, and the route to achieving high quality dispersions of SWNT is mainly chemical functionalization of the SWNT.… (More)

- Jonas Einarsson, Fabien Candelier, Fredrik Lundell, J-R Angilella, Bernhard Mehlig
- Physical review. E, Statistical, nonlinear, and…
- 2015

We consider the rotation of small neutrally buoyant axisymmetric particles in a viscous steady shear flow. When inertial effects are negligible the problem exhibits infinitely many periodic solutions, the "Jeffery orbits." We compute how inertial effects lift their degeneracy by perturbatively solving the coupled particle-flow equations. We obtain an… (More)

- Fabien Candelier, Jonas Einarsson, Fredrik Lundell, Bernhard Mehlig, J-R Angilella
- Physical review. E, Statistical, nonlinear, and…
- 2015

We analyze the angular dynamics of a neutrally buoyant, nearly spherical particle immersed in a steady general linear flow. The hydrodynamic torque acting on the particle is obtained by means of a reciprocal theorem, a regular perturbation theory exploiting the small eccentricity of the nearly spherical particle, and by assuming that inertial effects are… (More)

- Fredrik Lundell, Allan Carlsson
- Physical review. E, Statistical, nonlinear, and…
- 2010

The motion of an inertial ellipsoid in a creeping linear shear flow of a Newtonian fluid is studied numerically. This constitutes a fundamental system that is used as a basis for simulations and analysis of flows with heavy nonspherical particles. The torque on the ellipsoid is given analytically by Jeffery [Proc. R. Soc. London, Ser. A 102, 161 (1922)].… (More)

- Nitesh Mittal, Ronnie Jansson, +5 authors L Daniel Söderberg
- ACS nano
- 2017

Nature's design of functional materials relies on smart combinations of simple components to achieve desired properties. Silk and cellulose are two clever examples from nature-spider silk being tough due to high extensibility, whereas cellulose possesses unparalleled strength and stiffness among natural materials. Unfortunately, silk proteins cannot be… (More)

- Rachel Keller, B T Wigdor, Fredrik Lundell
- Canadian Psychiatric Association journal
- 1973