3D concrete printing using computational fluid dynamics: Modeling of material extrusion with slip boundaries

This paper investigates the role of slip boundary conditions in computational fluid dynamics modeling of material extrusion and layer deposition during 3D concrete printing. The mortar flow governed by the Navier-Stokes equations was simulated for two different slip boundary conditions at the extrus...

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Bibliographic Details
Published in:Journal of manufacturing processes Vol. 118; pp. 448 - 459
Main Authors: El Abbaoui, Khalid, Al Korachi, Issam, El Jai, Mostapha, Šeta, Berin, Mollah, Md. Tusher
Format: Journal Article
Language:English
Published: Elsevier Ltd 30.05.2024
Subjects:
3D concrete printing
Computational fluid dynamics
Cross-sectional shapes
Elasto-viscoplastic fluid model
Generalized Newtonian fluid model
Slip boundary conditions
Generalized Newtonian fluid model
3D concrete printing
Computational fluid dynamics
Elasto-viscoplastic fluid model
Cross-sectional shapes
Slip boundary conditions
ISSN:1526-6125
Online Access:Get full text
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Summary:This paper investigates the role of slip boundary conditions in computational fluid dynamics modeling of material extrusion and layer deposition during 3D concrete printing. The mortar flow governed by the Navier-Stokes equations was simulated for two different slip boundary conditions at the extrusion nozzle wall: no-slip and free-slip. The simulations were conducted with two constitutive models: a generalized Newtonian fluid model and an elasto-viscoplastic fluid model. The cross-sectional shapes of up to three printed layers were compared to the experimental results from literature for different geometrical- and speed-ratios. The results reveal that employing free-slip boundary conditions at the extrusion nozzle wall improves layer-mimicking quality for both constitutive models, indicating the presence and importance of a lubricating layer of fine particles at the concrete-solid wall interface. This enhanced performance is primarily due to the observed decrease in extrusion pressure that minimizes layer height- and width-deviations compared to the experimental prints. Furthermore, the free-slip boundary conditions play an important role in predicting the multilayer prints, its deformation and groove shapes.
ISSN:1526-6125
DOI:10.1016/j.jmapro.2024.03.042