Lattice Boltzmann model for thermal free surface flows with liquid–solid phase transition

Attar, Elham; Körner, Carolin

doi:10.1016/j.ijheatfluidflow.2010.09.006

Cited by 95 publications

(51 citation statements)

References 22 publications

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“…Körner et al [10] use the lattice Boltzmann method (LBM) under the assumption that the electron beam melting process can be represented in 2D. One big hurdle in this method is the severe numerical instabilities occurring when accounting for the temperature.…”

Section: Introductionmentioning

confidence: 99%

Laser powder-bed fusion additive manufacturing: Physics of complex melt flow and formation mechanisms of pores, spatter, and denudation zones

et al. 2016

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This study demonstrates the significant effect of the recoil pressure and Marangoni convection in laser powder bed fusion (L-PBF) of 316L stainless steel. A three-dimensional high fidelity powder-scale model reveals how the strong dynamical melt flow generates pore defects, material spattering (sparking), and denudation zones. The melt track is divided into three sections: a topological depression, a transition and a tail region, each being the location of specific physical effects. The inclusion of laser ray-tracing energy deposition in the powder-scale model improves over traditional volumetric energy deposition. It enables partial particle melting, which impacts pore defects in the denudation zone. Different pore formation mechanisms are observed at the edge of a scan track, at the melt pool bottom (during collapse of the pool depression), and at the end of the melt track (during laser power ramp down). Remedies to these undesirable pores are discussed. The results are validated against the experiments and the sensitivity to laser absorptivity is discussed.2

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Section: Introductionmentioning

confidence: 99%

Laser powder-bed fusion additive manufacturing: Physics of complex melt flow and formation mechanisms of pores, spatter, and denudation zones

et al. 2016

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“…The method has been used successfully in the simulation of liquid-gas flows of high viscosity and density ratio. Examples can be found in Ammer et al (2014); Anderl et al (2014); Attar and Körner (2011); Donath et al (2010); Janßen (2010); Janssen et al (2010); N. Thürey (2004; Xing et al (2007a,b), and in Bogner and Rüde (2013); Svec et al (2012) for complex liquid-gas-solid flows. However, no theoretical analysis of the FSLBM is currently available.…”

Section: Motivationmentioning

confidence: 99%

Boundary conditions for free interfaces with the lattice Boltzmann method

Bogner

Ammer

Rüde

2015

Journal of Computational Physics

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In this paper we analyze the boundary treatment of the lattice Boltzmann method (LBM) for simulating 3D flows with free surfaces. The widely used free surface boundary condition of Körner et al. (2005) is shown to be first order accurate. The article presents a new free surface boundary scheme that is suitable for second order accurate simulations based on the LBM. The new method takes into account the free surface position and its orientation with respect to the computational lattice. Numerical experiments confirm the theoretical findings and illustrate the different behavior of the original method and the new method.

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“…We use numerical simulation in order to understand the correlation between scanning strategy, resulting solidification conditions and microstructure. The numerical model (based on the Lattice Boltzmann Method) which we have developed for simulation of powder bed based additive manufacturing processes has been described in several publications [8][9][10][11][12][13][14][15]. The beam melting process is simulated on the powder scale, i.e.…”

Section: Numerical Simulationsmentioning

confidence: 99%

Tailoring the grain structure of IN718 during selective electron beam melting

Körner

Helmer

Bauereiß

et al. 2014

MATEC Web of Conferences

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118

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Abstract. Selective electron beam melting (SEBM) is an additive manufacturing method where complex parts are built from metal powders in layers of about 50 µm. SEBM works under vacuum conditions which results in a perfect protection of the metal alloy. The electron beam is used for heating (about 900 • C building temperature) and selective melting. The high beam velocities allow innovative scanning strategies in order to adapt the local solidification conditions which determine the epitaxial solidification process of IN718. We show how scanning strategies can be used either to produce a columnar grain structure with a high texture in building direction or a complete texture-free fine grained structure. Numerical simulations of the selective melting process are applied to reveal the fundamental mechanisms responsible for the completely different grain structures. In addition the influence of the different grain structures on the mechanical properties of IN718 is briefly discussed.

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Lattice Boltzmann model for thermal free surface flows with liquid–solid phase transition

Cited by 95 publications

References 22 publications

Laser powder-bed fusion additive manufacturing: Physics of complex melt flow and formation mechanisms of pores, spatter, and denudation zones

Laser powder-bed fusion additive manufacturing: Physics of complex melt flow and formation mechanisms of pores, spatter, and denudation zones

Boundary conditions for free interfaces with the lattice Boltzmann method

Tailoring the grain structure of IN718 during selective electron beam melting

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