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2 Journal of Theoretical and Applied Mechanics

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Numerical simulation of the particle settling in a Bingham fluid using the two-way coupling CFD-DEM scheme

Casarin Joviano Janjar, Franco Admilson Teixeira, Germer Eduardo Matos, Pivovarski Roderick Gustavo

Journal of Theoretical and Applied Mechanics

2022

Vol. 60 nr 3

409--422

The computational fluid dynamics coupled with the discrete element method is widely employed to simulate particle-fluid interactions in solid-liquid flows. The restrictions imposed by the CFD-DEM scheme to very fine meshes contribute to a scant amount of numerical results of particle settling in viscoplastic fluids. This paper presents the two-way coupling CFD-DEM simulation of the particle sedimentation in a quiescent Bingham fluid. The results for terminal particle velocity showed good agreement with the experimental data. Owing to the viscoplastic behavior of the fluid, low values of the relaxation parameter of the solid-phase must be specified to obtain accurate results.

Investigating the thermal and structural responses in hard-facing application with the GTAW process

Savaş Atilla

Journal of Theoretical and Applied Mechanics

2021

Vol. 59 nr 3

343--353

The gas tungsten arc welding (GTAW) process is an excellent way of performing quality hard- -facing applications. The residual stresses and distortions are encountered in hard-facing. There are several methods to decrease residual stresses. Changing the welding pattern, changing thickness and preheating can be mentioned for this purpose. In this work, the influence of the welding pattern, plate thickness and preheating was investigated. The temperature distribution with the same welding conditions was used for validation of the numerical model. The total deformation in a 2mm plate was 15 times higher than in a 6mm plate with the same welding conditions.