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1,341 results on '"Park, Chul B."'

9. A Deep Learning Algorithm for Piecewise Linear Interface Construction (PLIC)

Author

Ataei, Mohammadmehdi, Pirmorad, Erfan, Costa, Franco, Han, Sejin, Park, Chul B, and Bussmann, Markus

Subjects
Physics - Fluid Dynamics, Computer Science - Machine Learning, Mathematics - Numerical Analysis, 65Dxx
Abstract

Piecewise Linear Interface Construction (PLIC) is frequently used to geometrically reconstruct fluid interfaces in Computational Fluid Dynamics (CFD) modeling of two-phase flows. PLIC reconstructs interfaces from a scalar field that represents the volume fraction of each phase in each computational cell. Given the volume fraction and interface normal, the location of a linear interface is uniquely defined. For a cubic computational cell (3D), the position of the planar interface is determined by intersecting the cube with a plane, such that the volume of the resulting truncated polyhedron cell is equal to the volume fraction. Yet it is geometrically complex to find the exact position of the plane, and it involves calculations that can be a computational bottleneck of many CFD models. However, while the forward problem of 3D PLIC is challenging, the inverse problem, of finding the volume of the truncated polyhedron cell given a defined plane, is simple. In this work, we propose a deep learning model for the solution to the forward problem of PLIC by only making use of its inverse problem. The proposed model is up to several orders of magnitude faster than traditional schemes, which significantly reduces the computational bottleneck of PLIC in CFD simulations.

Published
2021

28. NPLIC: A Machine Learning Approach to Piecewise Linear Interface Construction

Author

Ataei, Mohammadmehdi, Bussmann, Markus, Shaayegan, Vahid, Costa, Franco, Han, Sejin, and Park, Chul B.

Subjects
Mathematics - Numerical Analysis, Computer Science - Machine Learning, Physics - Computational Physics, Physics - Fluid Dynamics, I.2, I.3, G.0
Abstract

Volume of fluid (VOF) methods are extensively used to track fluid interfaces in numerical simulations, and many VOF algorithms require that the interface be reconstructed geometrically. For this purpose, the Piecewise Linear Interface Construction (PLIC) technique is most frequently used, which for reasons of geometric complexity can be slow and difficult to implement. Here, we propose an alternative neural network based method called NPLIC to perform PLIC calculations. The model is trained on a large synthetic dataset of PLIC solutions for square, cubic, triangular, and tetrahedral meshes. We show that this data-driven approach results in accurate calculations at a fraction of the usual computational cost, and a single neural network system can be used for interface reconstruction of different mesh types.

Published
2020
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29. LBfoam: An open-source software package for the simulation of foaming using the Lattice Boltzmann Method

Author

Ataei, Mohammadmehdi, Shaayegan, Vahid, Costa, Franco, Han, Sejin, Park, Chul B., and Bussmann, Markus

Subjects
Physics - Computational Physics
Abstract

This paper presents a 2D/3D Free Surface Lattice Boltzmann Method simulation package called LBfoam for the simulation of foaming processes. The model incorporates the essential physics of foaming phenomena: gas diffusion into nucleated bubbles, bubble dynamics and coalescence, surface tension, the stabilizing disjoining pressure between bubbles, and Newtonian and non-Newtonian rheological models. The software can simulate the growth and interaction of bubbles, and predict final foam structures. The implementation is based on the Palabos library (in C++), which enables large-scale parallel simulations. The software is freely available under the GNU Affero General Public License version 3 at: https://github.com/mehdiataei/LBfoam, Comment: 33 pages, 17 figures

Published
2019
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35. Enhancing Mechanical Performance of High-Density Polyethylene at Different Environmental Conditions with Outstanding Foamability through In-Situ Rubber Nanofibrillation: Exploring the Impact of Interface Modification

Author

Kheradmandkeysomi, Mohamad, primary, Salehi, Amirmehdi, additional, Jalali, Amirjalal, additional, Omranpour, Hosseinali, additional, Tafreshi, Omid Aghababaei, additional, Naguib, Hani E., additional, and Park, Chul B., additional

Published
2024
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