Implementation of the Marangoni effect in an open-source software environment and the influence of surface tension modeling in the mushy region in laser powder bed fusion (LPBF)

Wirth, Florian; Tonn, Teresa; Schöberl, Markus; Stefan, Hermann; Birkhofer, Hannes; Ploshikhin, Vasily

doi:10.1088/1361-651x/ac4a26

Cited by 6 publications

(4 citation statements)

References 27 publications

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“…(2), were solved using the VoF method with an interface compression coefficient of c α = 0.5. The force scheme is implemented following Wirth, et al [18].…”

Section: Mathematical Frameworkmentioning

confidence: 99%

Binary droplet collisions in bioprinting: Influence of material properties on mixing and repeatability

Ruiz-Gutierrez,

Hasslberger,

Klein

et al. 2024

Preprint

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The study of suspended binary droplet collisions is an active research topic that has gathered interest due to its complexity and its industrial applications such as bioprinting. For many techniques that rely on the collision of two droplets, the quality of the outcome depends on the mixing process that begins when the droplets come in contact with each other. In this work, we study how the difference in material properties of colliding droplets, such as viscosity and surface tension, influence the mixing process. Employing multiphase direct numerical simulations, the distribution of the impinging liquids and the structure of the flow field have been analysed to find ways of mixing and process repeatability optimisation. To analyse the effects that differences in viscosity and surface tension have in the mixing process, the flows emerging from the collision are analysed. The differences in viscosity and surface tension have also been demonstrated to affect the trajectory of the centre of mass and morphology of the droplets upon collision, and thus could have implications from the point of view of process repeatability.

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“…(2), were solved using the VoF method with an interface compression coefficient of c α = 0.5. The force scheme is implemented following Wirth, et al [18].…”

Section: Mathematical Frameworkmentioning

confidence: 99%

Binary droplet collisions in bioprinting: Influence of material properties on mixing and repeatability

Ruiz-Gutierrez,

Hasslberger,

Klein

et al. 2024

Preprint

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“…To simulate the complicated additive manufacturing processes, various multiscale models have been adapted including the semicoupled resolved CFD-DEM, CFD-VOF, novel semiresolved VOF-DEM, and smooth particle hydrodynamics methods. ,− In addition, more complex coupled CFD models have also been developed. The liquid–solid phase change during additive manufacturing is usually captured by the enthalpy porosity or heat capacity method in the coupled models, while the gas–liquid can be calculated by the VOF method.…”

Section: Phase Change For Other Purposesmentioning

confidence: 99%

Recent Advances in CFD Simulations of Multiphase Flow Processes with Phase Change

Zhu

Zhang

et al. 2023

Ind. Eng. Chem. Res.

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Phase change is a phenomenon that has been extensively utilized in chemical engineering, energy, electronics, vehicle, and space exploration. From both the science and engineering perspectives, gaining a profound understanding of the intricacies of multiphase flow processes accompanied by heat and mass transfer due to phase change is of fundamental importance. Indeed, the computational fluid dynamics (CFD) has been increasingly applied as an effective tool to give an in-depth and efficient analysis of the phase change processes, thereby enhancing our understanding and capacity to control and optimize the phase change effects in these processes. This paper seeks to provide a comprehensive review of the utilization of CFD methodologies in the simulations of phase change flows across various applications, including temperature management, drying, separation and purification, and others. First, the CFD models at various scales that are developed to elucidate the phase change processes are summarized. Second, the noteworthy advances in the recent CFD simulation work on various phase change processes are presented, respectively. Finally, the challenges and potential prospects to facilitate the application of the phase change flow are discussed. The current review aims to offer insightful guidance for the CFD modeling of phase change processes in numerous engineering application scenarios.

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“…Addition of the tangential component of the surface tension force was included using the code provided by Wirth et al [7]. However, no difference was found as shown in Figure 5d.…”

Section: Numerical Modellingmentioning

confidence: 99%

Numerical modelling of high-power laser spot melting of thin stainless steel

Bunaziv,

Danielsen,

Eriksson

et al. 2023

IOP Conf. Ser.: Mater. Sci. Eng.

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Numerical modelling is an important scientific tool in laser materials processing to study different melting, evaporation, and solidification phenomena. It can assist in understanding why certain defects are formed, and thus may provide solution paths for how to decrease certain defects and to increase the quality of a product. Laser spot melting in heat conduction mode represents a simple case and is an excellent first step to build and test solvers prior to moving on to more complicated cases such as laser keyhole welding of thick plates. Modelling of laser spot melting requires only a limited computational domain and allows more complex physics to be added gradually. In this work, a thin 3.0 mm thick stainless steel plate was melted with high-power fiber laser and numerically simulated using a native and custom-build solver based on the VOF method within OpenFOAM. The process was captured with a high-speed imaging camera and simulation results are compared with the experimental results. It was found that temperature-dependent surface tension plays a vital role in controlling melt flow directions within melt pool.

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Implementation of the Marangoni effect in an open-source software environment and the influence of surface tension modeling in the mushy region in laser powder bed fusion (LPBF)

Cited by 6 publications

References 27 publications

Binary droplet collisions in bioprinting: Influence of material properties on mixing and repeatability

Binary droplet collisions in bioprinting: Influence of material properties on mixing and repeatability

Recent Advances in CFD Simulations of Multiphase Flow Processes with Phase Change

Numerical modelling of high-power laser spot melting of thin stainless steel

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