Session Details
CS02: Fluid Mechanics
Thursday, 12. October 2017; 16:00 - 18:00 Uhr in Raum 7.01
Sitzungsleitung: Ursula Rasthofer
16:00
Boundary-Conforming Space-Time Finite Elements for Co-Rotating Intermeshing Domains
Jan Helmig (RWTH Aachen University), Marek Behr (RWTH Aachen University), Stefanie Elgeti (RWTH Aachen University)
Kurzfassung:
Using boundary-conforming methods for co-rotating intermeshing domains is a complex task because the mesh has to be updated in every time step. Traditional methods like the elastic mesh update method require constant re-meshing due to mesh failure. We present a new, efficient approach, the Snapping Reference Mesh Update Method (SRMUM). It is based on a background mesh that constantly adapts to the current geometry. We apply the method to flow computations of plastic melt in twin-screw extruders.
Boundary-Conforming Space-Time Finite Elements for Co-Rotating Intermeshing Domains
Jan Helmig (RWTH Aachen University), Marek Behr (RWTH Aachen University), Stefanie Elgeti (RWTH Aachen University)
Kurzfassung:
Using boundary-conforming methods for co-rotating intermeshing domains is a complex task because the mesh has to be updated in every time step. Traditional methods like the elastic mesh update method require constant re-meshing due to mesh failure. We present a new, efficient approach, the Snapping Reference Mesh Update Method (SRMUM). It is based on a background mesh that constantly adapts to the current geometry. We apply the method to flow computations of plastic melt in twin-screw extruders.
16:20
Simulation of Oil Jets for Piston Cooling Applications Using Mesh Deformation and the Level Set Method
Loïc Wendling (RWTH Aachen University), Karyofyli Violeta (RWTH Aachen University), Markus Frings (RWTH Aachen University), Anselm Hopf (Ford Motor Company), Elgeti Stefanie (RWTH Aachen University), Marek Behr (RWTH Aachen University)
Kurzfassung:
The level set method is used to understand and design oil jets used to cool pistons of internal combustion engines. Different jet configurations ranging from laminar to atomized are presented and compared with experimental results. Exploiting the flexibility of the space-time finite element method, the reciprocating movement of the piston is modeled by using mesh deformation. The resulting multi-physics simulation realistically represents the main flow features.
Simulation of Oil Jets for Piston Cooling Applications Using Mesh Deformation and the Level Set Method
Loïc Wendling (RWTH Aachen University), Karyofyli Violeta (RWTH Aachen University), Markus Frings (RWTH Aachen University), Anselm Hopf (Ford Motor Company), Elgeti Stefanie (RWTH Aachen University), Marek Behr (RWTH Aachen University)
Kurzfassung:
The level set method is used to understand and design oil jets used to cool pistons of internal combustion engines. Different jet configurations ranging from laminar to atomized are presented and compared with experimental results. Exploiting the flexibility of the space-time finite element method, the reciprocating movement of the piston is modeled by using mesh deformation. The resulting multi-physics simulation realistically represents the main flow features.
16:40
Numerical two-phase simulations of the propagation of an evaporating extinguishing agent for optimal fire suppression
Waldemar Stapel (Helmut Schmidt University Hamburg), Michael Breuer (Helmut Schmidt University Hamburg)
Kurzfassung:
Fire suppression systems operate with extinguishing agents released from a reservoir and atomized into droplets. Flow predictions are separated into the release process and the propagation of the extinguishing agent. For the latter an Euler-Lagrange approach is used to model the two-phase flow. Data of the first simulation are used for the droplet initialization. The transformation of parcels into the gaseous state is treated by a evaporation model. The propagation of the agent is investigated.
Numerical two-phase simulations of the propagation of an evaporating extinguishing agent for optimal fire suppression
Waldemar Stapel (Helmut Schmidt University Hamburg), Michael Breuer (Helmut Schmidt University Hamburg)
Kurzfassung:
Fire suppression systems operate with extinguishing agents released from a reservoir and atomized into droplets. Flow predictions are separated into the release process and the propagation of the extinguishing agent. For the latter an Euler-Lagrange approach is used to model the two-phase flow. Data of the first simulation are used for the droplet initialization. The transformation of parcels into the gaseous state is treated by a evaporation model. The propagation of the agent is investigated.
17:00
Computational modeling of fiber flow during casting of fresh concrete
Vladislav Gudzulic (Ruhr University Bochum), Thai Son Dang (Ruhr University Bochum), Günther Meschke (Ruhr University Bochum)
Kurzfassung:
The Folgar-Tucker fiber orientation model coupled with weakly compressible Smoothed Particle Hydrodynamics is used to predict the spatial-temporal evolution of the probability density function of fiber orientation during process of casting of fiber reinforced concrete. The flow-able concrete-fiber mix is modeled as a viscous Bingham-type fluid. The model predictions qualitatively agree with fiber orientations observed in an L-box test with fibers suspended in transparent gel.
Computational modeling of fiber flow during casting of fresh concrete
Vladislav Gudzulic (Ruhr University Bochum), Thai Son Dang (Ruhr University Bochum), Günther Meschke (Ruhr University Bochum)
Kurzfassung:
The Folgar-Tucker fiber orientation model coupled with weakly compressible Smoothed Particle Hydrodynamics is used to predict the spatial-temporal evolution of the probability density function of fiber orientation during process of casting of fiber reinforced concrete. The flow-able concrete-fiber mix is modeled as a viscous Bingham-type fluid. The model predictions qualitatively agree with fiber orientations observed in an L-box test with fibers suspended in transparent gel.
17:20
Anisotropic surface and bulk stresses in transition metal oxide nanoparticles and their impact on diffusion
Peter Stein (Technical University of Darmstadt), Ashkan Moradabadi (FU Berlin), Manuel Diehm (Technical University of Darmstadt), Bai-Xiang Xu (Technical University of Darmstadt), Karsten Albe (Technical University of Darmstadt)
Kurzfassung:
We analyze the impact of surface stress on the strain distributions within a LiCoO$_2$ nanoparticle. Based on Ref. [1], we incorporate anisotropic surface stress into linear-elastic continuum models. Parameters are determined through ab-initio simulations. We compute the impact of the elastic fields on the formation and migration barriers of Li vacancies and discuss the intercalation behavior of nanostructured LiCoO$_2$. [1] D. Gross et al., Int. J. Mater. Res. 102(6):743-747 (2011)
Anisotropic surface and bulk stresses in transition metal oxide nanoparticles and their impact on diffusion
Peter Stein (Technical University of Darmstadt), Ashkan Moradabadi (FU Berlin), Manuel Diehm (Technical University of Darmstadt), Bai-Xiang Xu (Technical University of Darmstadt), Karsten Albe (Technical University of Darmstadt)
Kurzfassung:
We analyze the impact of surface stress on the strain distributions within a LiCoO$_2$ nanoparticle. Based on Ref. [1], we incorporate anisotropic surface stress into linear-elastic continuum models. Parameters are determined through ab-initio simulations. We compute the impact of the elastic fields on the formation and migration barriers of Li vacancies and discuss the intercalation behavior of nanostructured LiCoO$_2$. [1] D. Gross et al., Int. J. Mater. Res. 102(6):743-747 (2011)