Fraunhofer-Gesellschaft

Publica

Hier finden Sie wissenschaftliche Publikationen aus den Fraunhofer-Instituten.

Particle-based simulation of sheared magnetorheological fluids

 
: Lagger, Hanna

:
Fulltext urn:nbn:de:0011-n-3263610 (119 MByte PDF)
MD5 Fingerprint: f32818e231951cf4558a892afcff99f7
Created on: 12.2.2015

:

Stuttgart: Fraunhofer Verlag, 2015, 234 pp.
Zugl.: Freiburg, Univ., Diss., 2014
Fraunhofer IWM Forschungsberichte, 3
ISBN: 3-8396-0832-5
ISBN: 978-3-8396-0832-6
English
Dissertation, Electronic Publication
Fraunhofer IWM ()
Werkstoffwissenschaftler; Maschinenbauingenieur

Abstract
With a particle-based simulation approach, three aspects of magnetorheological fluids (MRF) are addressed: The role of the hydrodynamic drag model for the resulting shear stress in the simulation, the shear stress transmission and the structure formation of the suspended particles. To investigate the influence of the hydrodynamic drag law on the computed shear stress, different one-way coupled and two-way coupled drag models are compared. An easy-to-check criterion for the applicability of the commonly used one-way coupled discrete element model is derived. For an adequate modeling of shear stress in particle-based simulations, the particle-wall interaction is crucial. Using a physically motivated wall model, the experimental shear stress behavior is reproduced. On the basis of systematic simulations, possibilities for shear stress enhancement are discussed. To assess the mechanisms of shear stress transmission, the structure formation of the suspended particles is analyzed. For each of the different structure types observed in the simulations, a corresponding failure mechanism is reported. The particle-based approach allows for a detailed description of the failure process.

: http://publica.fraunhofer.de/documents/N-326361.html