Article
Mathematics, Applied
Giuseppe Sirianni, Barbara Re, Remi Abgrall, Alberto Guardone
Summary: A set of strategies and numerical techniques for simulating weakly compressible two-phase flows is presented, including a pressure formulation of the full Baer-Nunziato equations and a Momentum Weighted Interpolation formulation to mitigate pressure checkerboarding. The proposed approach is thoroughly tested against analytic and experimental data.
JOURNAL OF COMPUTATIONAL AND APPLIED MATHEMATICS
(2023)
Article
Polymer Science
Ahmad Fakhari, Zeljko Tukovic, Olga Sousa Carneiro, Celio Fernandes
Summary: Extrudate swell, a phenomenon that occurs in polymer processing, can be effectively modeled numerically to support design tasks. An improved interface tracking algorithm and the PISO algorithm for grid movement have been developed, showing accuracy and robustness in simulating extrudate swell flows. Inertia's role in extrudate swell has been studied, with the solver's results demonstrating good agreement with reference data in the scientific literature.
Article
Computer Science, Interdisciplinary Applications
Georgios P. Vafakos, Angelos Kafkas, Polycarpos K. Papadopoulos
Summary: This study presents a new version of the pressure-based implicit potential (IPOT) method for incompressible flows, which can be applied on a fully collocated mesh. The new version combines the IPOT algorithm with the Rhie and Chow (RC) technique to produce solutions on collocated grids that are free of spurious pressure modes. The method retains all the benefits of the original algorithm and does not require a special grid topology. The study also discusses the cause of spurious oscillations in zero-div problems and proposes a possible cure linked to the RC technique. The method is validated through several benchmark problems.
INTERNATIONAL JOURNAL FOR NUMERICAL METHODS IN FLUIDS
(2022)
Article
Multidisciplinary Sciences
Lei Zhou, Jianbo Li, Gao Lin
Summary: This paper presents the implementation of a polyhedron element with arbitrary convex topology based on SBFEM in ABAQUS. Through the use of the UEL interface, the automatic dynamic analysis of three-dimensional structures is achieved. Experimental results confirm that this method is more accurate than the traditional hexahedron element and requires less degrees of freedom for dynamic analysis.
SCIENTIFIC REPORTS
(2022)
Article
Engineering, Marine
Bo Yang, Fan Yang, Bingchen Liang, Qin Zhang, Zhenlu Wang, Jun Wang
Summary: A two-phase mixture model solver is established for simulating sediment plume and moving plate interaction based on OpenFOAM. It is validated against experiments and Smooth Particle Hydrodynamics (SPH) simulation study, showing good agreement with others. The study is extended to three-dimensional numerical simulations, comparing and analyzing characteristics of sediment concentration, lift and drag on the moving plate, and vortex structure simulated by different turbulence models.
Article
Engineering, Marine
Fan Chen, Wenjie Zhong, Decheng Wan
Summary: This study focuses on investigating the effects of diameter-length ratio and water entry angles on the hydrodynamic forces on cylinders with the same mass. By developing a numerical model and implementing a novel sliding mesh method, the factors influencing water entry problems are studied, and an equation is proposed that agrees well with the numerical results and can provide references for practical engineering problems.
Article
Computer Science, Interdisciplinary Applications
Weizhang Huang, Ruo Li, Jianxian Qiu, Min Zhang
Summary: A well-balanced moving mesh discontinuous Galerkin method is proposed for solving the Ripa model, which generalizes the shallow water equations considering water temperature variations. The method ensures well-balance, positivity-preserving, and high-order properties by employing a DG-interpolation scheme and special treatments for the Ripa model. Mesh adaptivity is achieved using an MMPDE moving mesh approach based on both perturbations of the lake-at-rest steady-state and water depth distribution. Numerical examples demonstrate the method's well-balance, high-order accuracy, positivity-preserving properties, and ability to capture small perturbations of the lake-at-rest steady-state.
JOURNAL OF COMPUTATIONAL PHYSICS
(2023)
Article
Computer Science, Interdisciplinary Applications
Guoliang Chai, Le Wang, Zhaolin Gu, Chunlei Yu, Yigen Zhang, Qinglin Shu, Junwei Su
Summary: This article proposes a consistent and sharp Eulerian fictitious domain method for moving boundary problems, validated through several numerical tests on different types of meshes. The method demonstrates high spatial accuracy and effective suppression of spurious force oscillations, particularly in the flow around a cylinder.
INTERNATIONAL JOURNAL FOR NUMERICAL METHODS IN FLUIDS
(2021)
Article
Computer Science, Interdisciplinary Applications
G. R. Anjos
Summary: The article evaluates the key aspects of two modern moving mesh methods for simulating two-phase flows, where one method requires smooth regularization of the Heaviside function to avoid instability while the other method maintains simulation through advanced remeshing algorithm.
COMPUTERS & FLUIDS
(2021)
Article
Environmental Sciences
Meissam L. Bahlali, Pablo Salinas, Matthew D. Jackson
Summary: Modeling density-driven flow in porous media is challenging, but using dynamic mesh optimization technique can improve the computational efficiency and accurately simulate the flow in different scenarios. The research results show that dynamic mesh optimization can accurately reproduce two-dimensional solutions with lower computational cost, and can also be extended to three-dimensional cases.
WATER RESOURCES RESEARCH
(2022)
Article
Thermodynamics
Amin Rasam, Zeinab Pouransari, Mohammad Reza Zangeneh
Summary: The performance of large-eddy simulation (LES) in predicting turbulent flow in a square duct with numerical dissipation caused by the Rhie-Chow interpolation is investigated. Various resolutions and bulk Reynolds numbers are explored using a second-order colocated finite-volume solver and the dynamic Smagorinsky (DS) subgrid-scale (SGS) model. LES simulations without an SGS model are also conducted to distinguish numerical and SGS dissipations. The use of Rhie-Chow interpolation increases errors in wall shear stress and enstrophy predictions, particularly at coarse resolutions, while omitting it partially improves mis-predictions in Reynolds stress and its anisotropy.
PROGRESS IN COMPUTATIONAL FLUID DYNAMICS
(2023)
Article
Computer Science, Interdisciplinary Applications
Hai-Zhuan Yuan, Qing Liu, Gang Zeng
Summary: A three-dimensional adaptive mesh refinement-multiphase lattice Boltzmann flux solver (3D-AMR-MLBFS) is developed for effectively simulating complex multiphase flows with large density ratio and high Reynolds number. The method combines the multiphase lattice Boltzmann flux solver (MLBFS) and the level set method to capture the interface, and applies a free energy-based continuum surface tension force (FE-CSF) model to calculate the surface tension force. The introduction of adaptive mesh refinement technology improves computational efficiency and accuracy. The developed method successfully reproduces four typical outcomes of droplet collision, demonstrating its effectiveness.
INTERNATIONAL JOURNAL FOR NUMERICAL METHODS IN FLUIDS
(2022)
Article
Mathematics, Applied
T. K. Kozubskaya, L. N. Kudryavtseva, V. O. Tsvetkova
Summary: This paper proposes a methodology for anisotropic adaptation of a moving unstructured mesh to the surface of an object of arbitrary shape with account for its possible displacement. The adapted mesh can be used in problems of external flow, where the bodies in airflow are modeled as regions in a continuous medium with low permeability using the immersed boundary method. By using a pre-constructed octree and defining adaptation parameters at its nodes, dynamic adaptation with preserved original mesh topology is achieved.
COMPUTATIONAL MATHEMATICS AND MATHEMATICAL PHYSICS
(2022)
Article
Engineering, Aerospace
Lucian Hanimann, Luca Mangani, Marwan Darwish, Ernesto Casartelli, Damian M. Vogt
Summary: Coupled algorithms have been shown to be superior for single fluid flow simulation compared to segregated algorithms, particularly in terms of robustness and performance. This paper extends the coupled approach to multi-fluid flows using a collocated and pressure-based finite volume discretization technique with a Eulerian-Eulerian model, demonstrating significant improvements in accuracy and performance compared to a leading commercial code for a transonic nozzle configuration.
INTERNATIONAL JOURNAL OF TURBOMACHINERY PROPULSION AND POWER
(2021)
Article
Engineering, Marine
Inno Gatin, Shengnan Liu, Vuko Vukcevic, Hrvoje Jasak
Article
Engineering, Marine
Andro Bakica, Nikola Vladimir, Inno Gatin, Hrvoje Jasak
Summary: Stringent rules and regulations aiming to reduce ship environmental footprint and improve propulsion efficiency have led to the development of various technical solutions, such as Energy Saving Devices (ESDs). This paper analyzes the hydrodynamic loadings on a circular duct, a typical ESD, of a bulk carrier in calm water and waves using Computational Fluid Dynamics (CFD). The study shows the significant effect of propeller suction on the ESD pressure distribution, highlighting its importance in assessing the structural reliability of ESDs in both calm water and waves.
SHIPS AND OFFSHORE STRUCTURES
(2021)
Article
Engineering, Civil
Ivo Senjanovic, Josip Katavic, Vuko Vukcevic, Nikola Vladimir, Hrvoje Jasak
ENGINEERING STRUCTURES
(2020)
Article
Computer Science, Interdisciplinary Applications
Tessa Uroic, Hrvoje Jasak
Summary: This study focuses on the implicit coupling solution approach in computational fluid dynamics, utilizing an algebraic multigrid algorithm for efficient computation. By employing domain decomposition method and parallel selection algebraic multigrid algorithm, the algorithm has been optimized to improve computational efficiency.
COMPUTER PHYSICS COMMUNICATIONS
(2021)
Article
Energy & Fuels
Robert Keser, Alberto Ceschin, Michele Battistoni, Hong G. Im, Hrvoje Jasak
Article
Computer Science, Interdisciplinary Applications
Robert Keser, Alberto Ceschin, Michele Battistoni, Hong G. Im, Hrvoje Jasak
Summary: This work presents the implementation, verification, and validation of an incompressible Eulerian multifluid model for polydisperse flows. The model shows good agreement with experimental measurements, stability on different levels of grid refinement, and reduced conservation error with implicit coupling.
INTERNATIONAL JOURNAL FOR NUMERICAL METHODS IN FLUIDS
(2021)
Article
Polymer Science
Ahmad Fakhari, Zeljko Tukovic, Olga Sousa Carneiro, Celio Fernandes
Summary: Extrudate swell, a phenomenon that occurs in polymer processing, can be effectively modeled numerically to support design tasks. An improved interface tracking algorithm and the PISO algorithm for grid movement have been developed, showing accuracy and robustness in simulating extrudate swell flows. Inertia's role in extrudate swell has been studied, with the solver's results demonstrating good agreement with reference data in the scientific literature.
Article
Engineering, Multidisciplinary
Ivan Batistic, Philip Cardiff, Zeljko Tukovic
Summary: This paper introduces a new contact boundary condition for finite volume simulations of frictional contact problems, based on penalty based segment-to-segment contact force calculation method. Compared to pointwise contact force calculation algorithm, this approach allows for more accurate and robust treatment of contact area edge.
APPLIED MATHEMATICAL MODELLING
(2022)
Article
Engineering, Multidisciplinary
Sinisa Majer, Zeljko Tukovic
Summary: A computational fluid dynamics study was conducted on a salient pole generator to determine the impact of rotor structural elements on windage losses. The analysis showed that centrifugal fans and poles account for a significant portion of the overall windage losses.
IEEE TRANSACTIONS ON INDUSTRY APPLICATIONS
(2021)
Article
Engineering, Chemical
Robert Keser, Michele Battistoni, Hong G. Im, Hrvoje Jasak
Summary: The article presents an Eulerian multi-fluid model for dynamic behavior of dense evaporating liquid fuel sprays, implemented in the open-source OpenFOAM library. The model employs class method and advanced interfacial momentum transfer models, successfully predicting the complex dynamic behavior of sprays.
Article
Engineering, Civil
Robinson Peric, Vuko Vukcevic, Moustafa Abdel-Maksoud, Hrvoje Jasak
Summary: This study proposes an analytical approach to optimize parameters in flow simulations with free-surface waves, demonstrating its effectiveness in reducing wave reflection errors through comparison with other methods.
COASTAL ENGINEERING
(2022)
Article
Polymer Science
Celio Fernandes, Ahmad Fakhari, Zeljko Tukovic
Summary: A new method based on the Arbitrary Lagrangian-Eulerian formulation has been developed to study the viscous flow of polymer melts. This method is validated by comparing the extrudate swell ratio under different flow conditions. Additionally, the study investigates the rheological behavior of the material and essential flow characteristics such as yield stress, inertia, and non-isothermal effects.
Article
Engineering, Multidisciplinary
Seevani Bali, Zeljko Tukovic, Philip Cardiff, Alojz Ivankovic, Vikram Pakrashi
Summary: This article introduces a novel finite volume formulation for geometrically exact beams undergoing large displacements and finite rotations, and demonstrates its effectiveness through various tests.
INTERNATIONAL JOURNAL FOR NUMERICAL METHODS IN ENGINEERING
(2022)
Article
Engineering, Multidisciplinary
Ivan Batistic, Philip Cardiff, Alojz Ivankovic, Zeljko Tukovic
Summary: This article presents a new implicit coupling procedure for mechanical contact simulations using an implicit cell-centred finite volume method. Both contact boundaries are treated as Neumann conditions, where the prescribed contact force is calculated using a penalty law, which is linearised and updated within the iterative solution procedure. Compared to the currently available explicit treatment, the implicit treatment offers better efficiency for the same accuracy.
INTERNATIONAL JOURNAL FOR NUMERICAL METHODS IN ENGINEERING
(2023)
Article
Engineering, Manufacturing
Gowthaman Parivendhan, Philip Cardiff, Thomas Flint, Zeljko Tukovic, Muhannad Obeidi, Dermot Brabazon, Alojz Ivankovic
Summary: This study presents a numerical model of the Laser Beam Powder Bed Fusion (PBF-LB) process that incorporates Computational Fluid Dynamics (CFD) and Discrete Element Method (DEM). The model successfully captures the particle distribution in the powder bed and the formation and dynamics of the melt pool. It considers factors such as surface tension, Marangoni convection, and recoil pressure at the metal/gas interface.
ADDITIVE MANUFACTURING
(2023)
Article
Computer Science, Interdisciplinary Applications
Jin Bao, Zhaoli Guo
Summary: At the equilibrium state of a two-phase fluid system, the chemical potential is constant and the velocity is zero. However, it is challenging to capture this equilibrium state accurately in numerical simulations, resulting in inconsistent thermodynamic interfacial properties and spurious velocities. Therefore, numerical schemes with well-balanced properties are preferred for simulating two-phase flows.
COMPUTERS & FLUIDS
(2024)
Article
Computer Science, Interdisciplinary Applications
Brian C. Vermeire
Summary: This study presents a framework for implicit large eddy simulation (ILES) of incompressible flows by combining the entropically damped artificial compressibility (EDAC) method with the flux reconstruction (FR) approach. Experimental results demonstrate that the method is accurate and stable for low-order solutions, while higher-order solutions exhibit significantly higher accuracy and lower divergence error compared to reference direct numerical simulation.
COMPUTERS & FLUIDS
(2024)
Article
Computer Science, Interdisciplinary Applications
Mijian Li, Rui Wang, Xinyu Guo, Xinyu Liu, Lianzhou Wang
Summary: In this study, the flow mechanisms around wall-mounted structures were investigated using Large Eddy Simulation (LES). The impact of inflow turbulence on the flow physics, dynamic response, and hydrodynamic performance was explored. The results revealed strong interference between velocity fluctuations and the wake past the cylinder, as well as significant convection effects in the far wake region.
COMPUTERS & FLUIDS
(2024)
Article
Computer Science, Interdisciplinary Applications
Donatella Passiatore, Luca Sciacovelli, Paola Cinnella, Giuseppe Pascazio
Summary: A high-order shock-capturing central finite-difference scheme is evaluated for numerical simulations of hyper-sonic high-enthalpy flows out of thermochemical equilibrium. The scheme utilizes a tenth-order accurate central-difference approximation of inviscid fluxes, along with high-order artificial dissipation and shock-capturing terms. The proposed approach demonstrates accuracy and robustness for a variety of thermochemical non-equilibrium configurations.
COMPUTERS & FLUIDS
(2024)
Article
Computer Science, Interdisciplinary Applications
Philipp Bahavar, Claus Wagner
Summary: Condensation is an important aspect in flow applications, and simulating the gas phase and tracking the deposition rates of condensate droplets can capture the effects of surface droplets on the flow while reducing computational costs.
COMPUTERS & FLUIDS
(2024)
Article
Computer Science, Interdisciplinary Applications
Andras Szabo, Gyorgy Paal
Summary: This paper introduces an efficient calculation method, the parabolized stability equations (PSE), for solving stability equations. By calculating LU factorization once in each marching step, the time spent on solving linear systems of equations can be significantly reduced. Numerical experiments demonstrate the effectiveness of this method in reducing the solution time for linear equations, and its applicability to similar problems.
COMPUTERS & FLUIDS
(2024)
Article
Computer Science, Interdisciplinary Applications
A. Khalifa, M. Breuer
Summary: This study evaluates a recently developed data-driven model for collision-induced agglomerate breakup in high mass loading flows. The model uses artificial neural networks to predict the post-collision behavior of agglomerates, reducing computational costs compared to coupled CFD-DEM simulations.
COMPUTERS & FLUIDS
(2024)
Article
Computer Science, Interdisciplinary Applications
Chunmei Du, Maojun Li
Summary: This paper considers the bilayer shallow water wave equations in one-dimensional space and presents an invariant domain preserving DG method to avoid Kelvin-Helmholtz instability.
COMPUTERS & FLUIDS
(2024)
Article
Computer Science, Interdisciplinary Applications
Jean-Michel Tucny, Mihir Durve, Andrea Montessori, Sauro Succi
Summary: The prediction of non-equilibrium transport phenomena in disordered media is a challenging problem for conventional numerical methods. Physics-informed neural networks (PINNs) show potential for solving this inverse problem. In this study, PINNs were used to successfully predict the velocity field of rarefied gas flow, and AdamW was found to be the best optimizer.
COMPUTERS & FLUIDS
(2024)
Article
Computer Science, Interdisciplinary Applications
Min Gao, Pascal Mossier, Claus-Dieter Munz
Summary: In recent decades, the arbitrary Lagrangian-Eulerian (ALE) approach has gained popularity in dealing with fluid flows with moving boundaries. This paper presents a novel algorithm that combines the ALE finite volume (FV) and ALE discontinuous Galerkin (DG) methods into a stable and efficient hybrid approach. The main challenge of this mixed ALE FV and ALE DG method is reducing the inconsistency between the two discretizations. The proposed algorithm is implemented into a loosely-coupled fluid-structure interaction (FSI) framework and is demonstrated through various benchmark test cases and complex scenarios.
COMPUTERS & FLUIDS
(2024)
Article
Computer Science, Interdisciplinary Applications
Dawid Strzelczyk, Maciej Matyka
Summary: In this study, the numerical convergence of the Meshless Lattice Boltzmann Method (MLBM) is investigated through three benchmark tests. The results are compared to the standard Lattice Boltzmann Method (LBM) and the analytical solution of the Navier-Stokes equation. It is found that MLBM outperforms LBM in terms of error value for the same number of nodes discretizing the domain.
COMPUTERS & FLUIDS
(2024)
Article
Computer Science, Interdisciplinary Applications
Kanishka Bhattacharya, Tapan Jana, Amit Shaw, L. S. Ramachandra, Vishal Mehra
Summary: In this work, an adaptive algorithm is developed to address the issue of tensile instability in Smoothed Particle Hydrodynamics (SPH) by adjusting the shape of the kernel function to satisfy stability conditions. The effectiveness of the algorithm is demonstrated through dispersion analysis and fluid dynamics simulations.
COMPUTERS & FLUIDS
(2024)
Article
Computer Science, Interdisciplinary Applications
Luis Laguarda, Stefan Hickel
Summary: We propose several enhancements to improve the accuracy and performance of the digital filter turbulent inflow generation technique, such as introducing a more realistic correlation function and varying target length scales. Additionally, we suggest generating inflow data in parallel at a prescribed time interval to improve computational performance. Based on the results of large-eddy simulations, these enhancements have shown to be beneficial. Suppressing streamwise velocity fluctuations at the inflow leads to the fastest relaxation of pressure fluctuations. However, this approach increases the adaptation length, which can be shortened by artificially increasing the wall-normal Reynolds stresses.
COMPUTERS & FLUIDS
(2024)
Article
Computer Science, Interdisciplinary Applications
Constantin Zenz, Michele Buttazzoni, Tobias Florian, Katherine Elizabeth Crespo Armijos, Rodrigo Gomez Vazquez, Gerhard Liedl, Andreas Otto
Summary: A new model for compressible multiphase flows involving sharp interfaces and phase change is presented, with a focus on the treatment of compressibility and phase change in the multiphase fluid flow model. The model's accuracy and suitability are demonstrated through comparisons with experimental observations.
COMPUTERS & FLUIDS
(2024)
Article
Computer Science, Interdisciplinary Applications
Joseph O'Connor, Sylvain Laizet, Andrew Wynn, Wouter Edeling, Peter V. Coveney
Summary: This article aims to apply uncertainty quantification and sensitivity analysis to the direct numerical simulation (DNS) of low Reynolds number wall-bounded turbulent channel flow. By using a highly scalable DNS framework and UQ techniques, the study evaluates the influence of different numerical parameters on the simulation results without explicitly modifying the code. The findings provide guidance for numerical simulations of wall-bounded turbulent flows.
COMPUTERS & FLUIDS
(2024)
