Management of an Academic HPC &amp; Research Computing Facility: The ULHPC Experience 2.0

Varrette, Sébastien; Cartiaux, Hyacinthe; Peter, Sarah; Kieffer, Emmanuel; Valette, Teddy; Olloh, Abatcha

doi:10.1145/3560442.3560445

Cited by 15 publications

(4 citation statements)

References 4 publications

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“…Moreover, we appreciate the help provided by Melvin Eichner to create the figures in this paper. The calculations in this paper were carried out using the HPC facilities at the University of Luxembourg [40] and the Swiss Supercomputing Center CSCS (project s1155). We also thank the University of Luxembourg and SwissNuclear for their support.…”

Section: Acknowledgmentsmentioning

confidence: 99%

Pore-Level Multiphase Simulations of Realistic Distillation Membranes for Water Desalination

et al. 2022

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Membrane distillation (MD) is a thermally driven separation process that is operated below boiling point. Since the performance of MD modules is still comparatively low, current research aims to improve the understanding of the membrane structure and its underlying mechanisms at the pore level. Based on existing realistic 3D membrane geometries (up to 0.5 billion voxels with 39nm resolution) obtained from ptychographic X-ray computed tomography, the D3Q27 lattice Boltzmann (LB) method was used to investigate the interaction of the liquid and gaseous phase with the porous membrane material. In particular, the Shan and Chen multi-phase model was used to simulate multi-phase flow at the pore level. We investigated the liquid entry pressure of different membrane samples and analysed the influence of different micropillar structures on the Wenzel and Cassie–Baxter state of water droplets on rough hydrophobic surfaces. Moreover, we calculated the liquid entry pressure required for entering the membrane pores and extracted realistic water contact surfaces for different membrane samples. The influence of the micropillars and flow on the water-membrane contact surface was investigated. Finally, we determined the air–water interface within a partially saturated membrane, finding that the droplet size and distribution correlated with the porosity of the membrane.

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Section: Acknowledgmentsmentioning

confidence: 99%

Pore-Level Multiphase Simulations of Realistic Distillation Membranes for Water Desalination

et al. 2022

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“…The calculations in this paper were carried out using the HPC facilities of the University of Luxembourg 34 (see ) and the Swiss Supercomputing Center CSCS (project s1155). We also thank the University of Luxembourg and SwissNuclear for its support.…”

Section: Acknowledgmentsmentioning

confidence: 99%

Validating the Transition Criteria from the Cassie–Baxter to the Wenzel State for Periodically Pillared Surfaces with Lattice Boltzmann Simulations

Jäger,

Mokos,

Prasianakis

et al. 2024

ACS Omega

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Microfabrication techniques allow the development and production of artificial superhydrophobic surfaces that possess a precisely controlled roughness at the micrometer level, typically achieved through the arrangement of micropillar structures in periodic patterns. In this work, we analyze the stability and energy barrier of droplets in the Cassie−Baxter (CB) state on such periodic patterns. In addition, we further develop a transition criterion using the CB equation and derive an improved version which allows predicting for which pillar geometries, equilibrium contact angles, and droplet volumes the CB state switches from a metastable to an unstable state. This enables a comparison with existing experiments and three-dimensional multiphase Lattice Boltzmann simulations for different pillar distances, two contact angles, and two droplet volumes, where a good agreement has been found.

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“…We are thankful for the many fruitful discussions with Filip Janasz. The calculations in this paper were carried out using the HPC facilities of the University of Luxembourg [44] (see hpc.uni.lu) and the Swiss Supercomputing Center CSCS (project s1155). We also thank the University of Luxembourg and SwissNuclear for their support.…”

Section: Acknowledgmentsmentioning

confidence: 99%

Theoretical and Numerical Constant Mean Curvature Surface and Liquid Entry Pressure Calculations for a Combined Pillar–Pore Structure

et al. 2023

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Modern microfabrication techniques have led to a growing interest in micropillars and pillar–pore structures. Therefore, in this paper a study of the liquid entry pressure of a hydrophobic pillar–pore structure and the corresponding liquid–gas interface shape for the pressurized liquid is presented. We theoretically analysed the constant mean curvature problem for the rotationally symmetric case and determined an analytical expression for the liquid entry pressure of a hydrophobic pillar–pore structure. Furthermore, the shape of the liquid–gas interface as well as a formula for the location of the minimum were derived. The results are useful for designing geometries with specific properties, such as preventing or facilitating liquid intrusion into rough structures. We compared these results to multiphase lattice Boltzmann simulations where equilibrium contact angles in the range of 157∘ to 102∘ were tested. In our further analysis, we compared theoretical findings from previous works to our lattice Boltzmann simulations. The presented cases can serve as a benchmark for the development and validation of numerical multiphase models.

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Management of an Academic HPC & Research Computing Facility: The ULHPC Experience 2.0

Cited by 15 publications

References 4 publications

Pore-Level Multiphase Simulations of Realistic Distillation Membranes for Water Desalination

Pore-Level Multiphase Simulations of Realistic Distillation Membranes for Water Desalination

Validating the Transition Criteria from the Cassie–Baxter to the Wenzel State for Periodically Pillared Surfaces with Lattice Boltzmann Simulations

Theoretical and Numerical Constant Mean Curvature Surface and Liquid Entry Pressure Calculations for a Combined Pillar–Pore Structure

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