An accurate methodology for surface tension modeling in OpenFOAM

Saufi, Abd Essamade; Cuoci, Alberto

doi:10.48550/arxiv.2005.02865

Cited by 3 publications

(3 citation statements)

References 54 publications

(98 reference statements)

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“…This geometric interpolation adds to the computation cost (Ivey and Moin, 2015). Additionally, the most recent implementation of this on OpenFOAM only has support for structured grids (Saufi et al, 2020). The default method setting for surface tension computation in OpenFOAM is continuum surface force (CSF) (Brackbill et al, 1992).…”

Section: Surface Tensionmentioning

confidence: 99%

Numerical and experimental investigation of gas flow field variations in three-dimensional printed gas-dynamic virtual nozzles

Nazari

Ansari²,

Herrmann³

et al. 2023

Front. Mech. Eng.

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Gas-dynamic virtual nozzles (GDVNs) play a vital role in delivering biomolecular samples during diffraction measurements at X-ray free-electron laser facilities. Recently, submicrometer resolution capabilities of two-photon polymerization 3D printing techniques opened the possibility to quickly fabricate gas-dynamic virtual nozzles with practically any geometry. In our previous work, we exploited this capability to print asymmetric gas-dynamic virtual nozzles that outperformed conventional symmetric designs, which naturally leads to the question of how to identify the optimal gas-dynamic virtual nozzle geometry. In this work, we develop a 3D computational fluid dynamics pipeline to investigate how the characteristics of microjets are affected by gas-dynamic virtual nozzle geometry, which will allow for further geometry optimizations and explorations. We used open-source software (OpenFOAM) and an efficient geometric volume-of-fluid method (isoAdvector) to affordably and accurately predict jet properties for different nozzle geometries. Computational resources were minimized by utilizing adaptive mesh refinement. The numerical simulation results showed acceptable agreement with the experimental data, with a relative error of about 10% for our test cases that compared bell- and cone-shaped sheath-gas cavities. In these test cases, we used a relatively low sheath gas flow rate (6 mg/min), but future work including the implementation of compressible flows will enable the investigation of higher flow rates and the study of asymmetric drip-to-jet transitions.

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Section: Surface Tensionmentioning

confidence: 99%

Numerical and experimental investigation of gas flow field variations in three-dimensional printed gas-dynamic virtual nozzles

Nazari

Ansari²,

Herrmann³

et al. 2023

Front. Mech. Eng.

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“…Thus, ijkZone class is utilized in its implementation. We note that the height function method is implemented into OpenFOAM by other researchers as well [44,45] but only our version will be tested here.…”

Section: Implementation and Solver Detailsmentioning

confidence: 99%

Deep learning of interfacial curvature: a symmetry-preserving approach for the volume of fluid method

Önder¹,

Liu²

2022

Preprint

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Accurate estimation of the curvature of the fluid-fluid interfaces is essential for the success of Volume of Fluid (VOF) methods in surface-tension dominated flows. The present study employs artificial neural networks with deep multilayer perceptron (MLP) architecture to estimate the interfacial curvature from volume fraction fields on regular grids. Using input normalization, odd-symmetric activation functions and bias-free neurons, we construct a costeffective MLP model that conserves the symmetries in the curvature fields. MLP models are implemented into a flow solver (OpenFOAM) and tested against conventional schemes in the literature. The symmetry-preserving MLP model shows superior performance compared to its standard counterpart and has similar accuracy and convergence properties with the state-of-the art conventional method despite using smaller stencil.

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“…Then, we conclude the reported results are mesh-independent. Saufi et al [33] study spurious currents in the interFoam solver, placing a 1 mm diameter water droplet in a medium. After 0.2 s, improper curvature calculations resulted in catastrophic droplet deformation.…”

Section: Numerical Model Reviewmentioning

confidence: 99%

OpenFOAM Simulations of Late Stage Container Draining in Microgravity

McCraney

Weislogel

Steen

2020

Fluids

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In the reduced acceleration environment aboard orbiting spacecraft, capillary forces are often exploited to access and control the location and stability of fuels, propellants, coolants, and biological liquids in containers (tanks) for life support. To access the ‘far reaches’ of such tanks, the passive capillary pumping mechanism of interior corner networks can be employed to achieve high levels of draining. With knowledge of maximal corner drain rates, gas ingestion can be avoided and accurate drain transients predicted. In this paper, we benchmark a numerical method for the symmetric draining of capillary liquids in simple interior corners. The free surface is modeled through a volume of fluid (VOF) algorithm via interFoam, a native OpenFOAM solver. The simulations are compared with rare space experiments conducted on the International Space Station. The results are also buttressed by simplified analytical predictions where practicable. The fact that the numerical model does well in all cases is encouraging for further spacecraft tank draining applications of significantly increased geometric complexity and fluid inertia.

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An accurate methodology for surface tension modeling in OpenFOAM

Cited by 3 publications

References 54 publications

Numerical and experimental investigation of gas flow field variations in three-dimensional printed gas-dynamic virtual nozzles

Numerical and experimental investigation of gas flow field variations in three-dimensional printed gas-dynamic virtual nozzles

Deep learning of interfacial curvature: a symmetry-preserving approach for the volume of fluid method

OpenFOAM Simulations of Late Stage Container Draining in Microgravity

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