Influence of melt convection on the morphological evolution of seaweed structures: Insights from phase-field simulations

Laxmipathy, V. Pavan; Wang, Fei; Selzer, Michael; Nestler, Britta; Ankit, Kumar

doi:10.1016/j.commatsci.2019.109196

Cited by 6 publications

(3 citation statements)

References 62 publications

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“…With increasing solid-liquid interfacial energy contribution, i.e., for decreasing R 0 , and as shown via Figure 4, we also notice that a shallow groove shape promotes the constrained growth of humps such that the instability height decreases as a function of simulation time. This behavior qualitatively agrees with previous experimental and phase-field studies [7,31], where the role of a grain boundary groove on the initiation of morphological instabilities during alloy solidification was discussed in detail. Furthermore, the stability analysis by Coriell et al [32] also provided a theoretical background.…”

Section: Effect Of Groove Shapesupporting

confidence: 90%

A Two-Dimensional Phase-Field Investigation on Unidirectionally Solidified Tip-Splitting Microstructures

Laxmipathy

Wang

Selzer

et al. 2022

Metals

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The onset of morphological instabilities along a solidifying interface has a tendency to influence the microstructural characteristics of cast alloys. In the present study, the initiation as well as the mechanism of microstructural pattern formation is investigated by a quantitative phase-field approach. For energetically isotropic interfaces, we show that the presence of grain boundary grooves promotes the initiation of morphological instabilities, and with progressive solidification, they subsequently amplify into tip-splitting microstructures. We also demonstrate that the grain boundary groove shape influences the amplification of the ridge-shaped instability near the pit region. The structural transition of tip splitting to dendritic microstructures is showcased through the effect of interfacial anisotropy. In addition, the prediction of the tip-splitting position is discussed through an analytical criterion, wherein the sign of the surface Laplacian of interfacial curvature dictates the formation of crest and trough positions in a tip-splitting pattern. In complete agreement with the sharp-interface theory, our phase-field simulations validate the analytically obtained tip-splitting position and suggest that the two tips evolve symmetrically on either side of the hindered concave region. Furthermore, the role of lattice anisotropy on the tip-splitting phenomenon is also discussed in detail.

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Section: Effect Of Groove Shapesupporting

confidence: 90%

A Two-Dimensional Phase-Field Investigation on Unidirectionally Solidified Tip-Splitting Microstructures

Laxmipathy

Wang

Selzer

et al. 2022

Metals

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“…There is a broad field of applications for coupling the phase‐field with a concentration field. Previously, this coupling has been applied, for example, to corrosion of steels (e.g., Mai et al., 2016), solidification of alloys (e.g., Steinmetz et al., 2018) including advective effects (e.g., Laxmipathy et al., 2019), polymer solutions (e.g., H. Zhang et al., 2021), charging of battery systems (e.g., Daubner et al., 2022), hydrogen fuel cells (e.g., Hoffrogge et al., 2021), and martensitic phase transformation (e.g., Schoof et al., 2019), just to name a few.…”

Section: Introductionmentioning

confidence: 99%

“…Even though the phase-field modeling of crystal growth has been applied in previous studies to various subsurface systems and a reconstruction of natural microstructures was possible, an extension to supersaturation dependent crystal growth in multi-grain environments including crystallographic anisotropies and allowing the depiction of temporal and spatial variations of crystallization velocities has not been presented so far. This work aims to extend previous phase-field modeling studies (Ankit et al, 2015;Laxmipathy et al, 2019;Prajapati, Abad Gonzalez, et al, 2020;Späth et al, 2021) with the incorporation of advective and diffusive mass transport by solving concentration and fluid flow equations. This modeling approach enables a quantitative description of the crystal growth process of potash alum in an advective fluid and opens the door for future works in the direction of crystal growth processes in fractured rock and in upscaling the results to the reservoir scale.…”

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confidence: 99%

Phase‐Field Simulations of Epitaxial Crystal Growth in Open Fractures With Reactive Lateral Flow

Späth

Selzer

Busch

et al. 2023

Water Resources Research

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Fluid flow in fracture porosity in the Earth's crust is in general accompanied by crystallization or dissolution depending on the state of saturation. The evolution of the microstructure in turn affects the transport and mechanical properties of the rock, but the understanding of this coupled system is incomplete. Here, we aim to simulate spatio‐temporal observations of laboratory experiments at the grain scale (using potash alumn), where crystals grow in a fracture during reactive flow, and show a varying growth rate along the fracture due to saturation differences. We use a multiphase‐field modeling approach, where reactive fluid flow and crystal growth is computed and couple the chemical driving force for grain growth to the local saturation state of the fluid. The supersaturation of the fluid is characterized by a concentration field which is advected by fluid flow and in turn affects the crystal growth with anisotropic growth kinetics. The simulations exhibit good agreement with the experimental results, providing the basis for upscaling our results to larger scale computations of combined multi‐physical processes in fractured porous media for applications as groundwater protection, geothermal, and hydrocarbon reservoir prediction, water recovery, or storing H2 or CO2 in the subsurface.

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Microstructural transition in monotectic alloys: A phase-field study

Laxmipathy

Wang

Selzer

et al. 2020

International Journal of Heat and Mass Transfer

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Influence of melt convection on the morphological evolution of seaweed structures: Insights from phase-field simulations

Cited by 6 publications

References 62 publications

A Two-Dimensional Phase-Field Investigation on Unidirectionally Solidified Tip-Splitting Microstructures

A Two-Dimensional Phase-Field Investigation on Unidirectionally Solidified Tip-Splitting Microstructures

Phase‐Field Simulations of Epitaxial Crystal Growth in Open Fractures With Reactive Lateral Flow

Microstructural transition in monotectic alloys: A phase-field study

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