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3D simulation of interdendritic flow through a Al-18wt.%Cu structure captured with X-ray microtomography

Domitner, J and Hölzl, C and Kharicha, A and Wu, M and Ludwig, A and Köhler, M and Ratke, L (2011) 3D simulation of interdendritic flow through a Al-18wt.%Cu structure captured with X-ray microtomography. In: IOP Conf. Series: Materials Science and Engineering, 27 (012016). IOP Publishing Ltd., UK. ICASP 3, 7.-10. June 2011, Rolduc, Netherlands. ISSN 1757-899X

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Official URL: http://iopscience.iop.org/1757-899X/27/1/012016

Abstract

A central parameter to describe the formation of porosity and macrosegregation during casting processes is the permeability of the dendritic mushy zone. To determine this specific feature for a binary Al-18wt.%Cu alloy, flow simulations based on the Lattice Boltzmann (LB) method were performed. The LB method allows an efficient solving of fluid flow problems dealing with complex shapes within an acceptable period of time. The 3D structure required as input for the simulations was captured with X-ray microtomography, which enables the generation of representative geometries for permeability investigations. Removing the eutectic phase from the measured dataset generated a remaining network of solid primary dendrites. In the simulations, a pressure gradient was applied to force the liquid through the free interdendritic channels. The permeability of the structure was then calculated from the resulting flow velocity pattern using Darcy’s law. To examine the influence of different boundary conditions on the results obtained, several simulations were conducted.

Document Type:Conference or Workshop Item (Paper, Poster)
Title:3D simulation of interdendritic flow through a Al-18wt.%Cu structure captured with X-ray microtomography
Authors:
AuthorsInstitution or Email of Authors
Domitner, JUniversity of Leoben
Hölzl, CMaterails Res. Center Leoben
Kharicha, AUniversity of Leoben
Wu, MUniversity of Leoben
Ludwig, AUniversity of Leoben
Köhler, MUNSPECIFIED
Ratke, LUNSPECIFIED
Date:December 2011
Journal or Publication Title:IOP Conf. Series: Materials Science and Engineering
Refereed publication:Yes
In ISI Web of Science:Yes
Volume:27
Editors:
EditorsEmail
Ratke, LorenzDLR
Zimmermann, GerhardAccess eV, Aachen
Publisher:IOP Publishing Ltd., UK
ISSN:1757-899X
Status:Published
Keywords:permeability, mushy zone, dendritic network, tomography, fludi flow
Event Title:ICASP 3
Event Location:Rolduc, Netherlands
Event Type:international Conference
Event Dates:7.-10. June 2011
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Research under Space Conditions
DLR - Research area:Raumfahrt
DLR - Program:R FR - Forschung unter Weltraumbedingungen
DLR - Research theme (Project):R - Vorhaben Materialwissenschaftliche Forschung
Location: Köln-Porz
Institutes and Institutions:Institute of Materials Physics in Space
Deposited By: Prof. Lorenz Ratke
Deposited On:31 Jan 2012 15:03
Last Modified:12 Dec 2013 21:36

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