Article
Computer Science, Interdisciplinary Applications
Pablo Castrillo, Alfredo Canelas, Eugenio Schillaci, Joaquim Rigola, Asensio Oliva
Summary: This paper presents a high-order finite volume method using Moving Least Squares (MLS) and Local Regression Estimators (LRE) for solving linear elasticity problems on two-dimensional unstructured meshes. The method effectively solves structural problems affected by shear locking and demonstrates accuracy and flexibility through canonical tests and analytical examples.
COMPUTERS & STRUCTURES
(2022)
Article
Computer Science, Interdisciplinary Applications
Yaping Chen, Kailiang Wu
Summary: This paper presents a highly robust third-order accurate finite volume weighted essentially non-oscillatory (WENO) method for special relativistic hydrodynamics on unstructured triangular meshes. The proposed method is proved to preserve the physical constraints and novel techniques are introduced to address the strong nonlinearity.
JOURNAL OF COMPUTATIONAL PHYSICS
(2022)
Article
Mathematics, Applied
Tarek Ghoudi, M. Shadi Mohamed, Mohammed Seaid
Summary: A new adaptive finite volume method is proposed for the simulation of wave problems in the time domain. The method discretizes the transient wave equations in time and space, and utilizes a vertex-centered finite volume method with both cell-centered and edge-midpoint. The method also includes a mesh adaptation procedure based on energy-norm error-estimates, allowing for multiple adaptations within a single error estimation.
COMPUTERS & MATHEMATICS WITH APPLICATIONS
(2023)
Article
Mathematics, Applied
Panagiotis Tsoutsanis, Ebenezer Mayowa Adebayo, Adrian Carriba Merino, Agustin Perez Arjona, Martin Skote
Summary: This paper extends the application of high-order finite-volume central-weighted essentially non-oscillatory (CWENO) schemes to multicomponent flows using the interface capturing paradigm, achieving high-order accurate and oscillation free solutions. The schemes are compact and perform well, but have limitations within the present interface-capturing implementation.
JOURNAL OF SCIENTIFIC COMPUTING
(2021)
Article
Computer Science, Interdisciplinary Applications
Savinien Pertant, Manuel Bernard, Giovanni Ghigliotti, Guillaume Balarac
Summary: This paper presents a robust and accurate method for numerically simulating moving contact lines on complex boundaries with surface wettability effects. The method is validated on 2D and 3D test cases, demonstrating good mass conservation properties and the ability to handle realistic scenarios such as drop detachment from horizontal fibers using dynamic mesh adaptation.
JOURNAL OF COMPUTATIONAL PHYSICS
(2021)
Article
Mathematics, Applied
Ashwani Assam, Ganesh Natarajan
Summary: A new second-order accurate finite volume scheme for diffusion equations with discontinuous coefficients on unstructured meshes is proposed in the paper. This scheme is based on least squares reconstruction and the concept of alpha damping for linear exactness, with two variants introduced for different conditions to improve the accuracy of the solution. Numerical experiments show that these schemes are capable of estimating the solution and fluxes accurately on generic polygonal meshes, and are discrete extremum preserving.
COMPUTERS & MATHEMATICS WITH APPLICATIONS
(2021)
Article
Engineering, Multidisciplinary
Bassou Khouya, Mofdi El-Amrani, Mohammed Seaid
Summary: In this study, the performance of slope limiters applied to three-dimensional modified method of characteristics on unstructured tetrahedral meshes was investigated. The proposed method combines linear and quadratic interpolation procedures to reconstruct a monotone and essentially nonoscillatory solver for three-dimensional problems at minor additional cost. The proposed method demonstrates its ability to accurately capture three-dimensional transport features without nonphysical oscillations in test problems.
INTERNATIONAL JOURNAL OF COMPUTATIONAL METHODS
(2021)
Article
Thermodynamics
S. Parameswaran, J. C. Mandal
Summary: A robust finite volume framework is developed for solving incompressible two-phase flow problems on structured meshes, and it is extended to unstructured meshes in this paper. The surface tension effect is also modeled to enhance the applicability to real-life engineering problems. Least square and Green-Gauss integral based methods are used to deal with arbitrary unstructured mesh topology. The proposed method shows improved accuracy compared to the structured mesh formulation, as demonstrated through numerical tests involving various forces.
NUMERICAL HEAT TRANSFER PART B-FUNDAMENTALS
(2023)
Article
Mechanics
Rohit Kumar, B. Premachandran
Summary: A new coupled level set and volume of fluid (CLSVOF) method is presented for numerical modelling of boiling flows with accurate interface dynamics, tested against various advection test cases and simulations of saturated film boiling over flat and cylindrical surfaces. The method shows good agreement with previous studies using higher order interface reconstruction techniques.
INTERNATIONAL JOURNAL OF MULTIPHASE FLOW
(2022)
Article
Mathematics, Applied
Alexandre Chiapolino, Francois Fraysse, Richard Saurel
Summary: A new method has been developed for approximating a first-order Hamilton-Jacobi equation, focusing on the constant motion of an interface in the normal direction. The method utilizes a sharp Level-Set function approximated through a finite-volume Godunov-type scheme, controlling numerical diffusion with the Overbee limiter. The results demonstrate excellent agreement with analytical solutions, including the computation of geometrical properties like interfacial area and volume.
JOURNAL OF SCIENTIFIC COMPUTING
(2021)
Article
Mathematics, Applied
S. Busto, M. Dumbser, L. Rio-Martin
Summary: This paper presents a novel semi-implicit hybrid finite volume/finite element scheme for the numerical solution of the incompressible and weakly compressible Navier-Stokes equations on moving unstructured meshes. The scheme employs a suitable splitting of the equations, a staggered grid arrangement, and a space-time control volume approach. Numerical results demonstrate the high accuracy and computational efficiency of the proposed method.
APPLIED MATHEMATICS AND COMPUTATION
(2023)
Article
Computer Science, Interdisciplinary Applications
Jun Liu, Tobias Tolle, Dieter Bothe, Tomislav Maric
Summary: This study extends a method for handling two-phase flows with different densities and provides a theoretical basis for the numerical consistency between mass and momentum conservation. The proposed method demonstrates exact numerical stability for two-phase momentum advection and performs well in challenging fluid pairings.
JOURNAL OF COMPUTATIONAL PHYSICS
(2023)
Article
Mechanics
Y. Y. Liu, C. Shu, H. W. Zhang, L. M. Yang
Summary: This study presents a high-order implicit least squares-based finite difference-finite volume method for simulating two-dimensional incompressible flows, showing improved convergence and computational efficiency compared to its explicit counterpart.
Article
Computer Science, Interdisciplinary Applications
Miguel Uh Zapata, Reymundo Itza Balam
Summary: This paper introduces a second-order unstructured finite-volume method developed to solve a conservative level-set equation in two-and three-dimensional geometries. The method shows good performance and accuracy in capturing interface problems, particularly in smooth framework resulting from the signed distance function.
JOURNAL OF COMPUTATIONAL PHYSICS
(2021)
Article
Engineering, Multidisciplinary
Derek C. Thomas, Luke Engvall, Steven K. Schmidt, Kevin Tew, Michael A. Scott
Summary: U-splines are a novel approach to constructing spline bases for representing smooth objects in CAD and CAE. They differ from existing constructions by accommodating local variation in cell size, polynomial degree, and smoothness simultaneously. The U-spline algorithm introduces a new technique for constructing basis functions using local null space solutions.
COMPUTER METHODS IN APPLIED MECHANICS AND ENGINEERING
(2022)
Article
Thermodynamics
F. Favre, O. Antepara, C. Oliet, O. Lehmkuhl, C. D. Perez-Segarra
APPLIED THERMAL ENGINEERING
(2019)
Article
Engineering, Environmental
Ahmad Amani, Nestor Balcazar, Alireza Naseri, Joaquim Rigola
CHEMICAL ENGINEERING JOURNAL
(2020)
Article
Computer Science, Interdisciplinary Applications
Oscar Antepara, Nestor Balcazar, Assensi Oliva
Summary: This article introduces a parallel adaptive mesh refinement strategy for two-phase flows using tetrahedral meshes, which combines a conservative level-set method and tetrahedral adaptive meshes within a finite volume framework. The approach involves cell-based refinement and mesh adaptation based on physics-based criteria. The study demonstrates the capability and accuracy of 3D adapted tetrahedral grids in simulating two-phase flows with surface tension.
INTERNATIONAL JOURNAL FOR NUMERICAL METHODS IN FLUIDS
(2021)
Article
Computer Science, Hardware & Architecture
Jordan Musser, Ann S. Almgren, William D. Fullmer, Oscar Antepara, John B. Bell, Johannes Blaschke, Kevin Gott, Andrew Myers, Roberto Porcu, Deepak Rangarajan, Michele Rosso, Weiqun Zhang, Madhava Syamlal
Summary: MFIX-Exa is a CFD-DEM code designed to run efficiently on current and next-generation supercomputing architectures, leveraging the expertise of MFIX and the software framework AMReX to optimize modeling and design of multiphase chemical reactors on future exascale machines.
INTERNATIONAL JOURNAL OF HIGH PERFORMANCE COMPUTING APPLICATIONS
(2022)
Article
Computer Science, Interdisciplinary Applications
Jesus Ruano, Aleix Baez Vidal, Joaquim Rigola, Francesc Xavier Trias
Summary: This article presents a new numerical method for analyzing dispersion errors and evaluating them on Cartesian stretched grids for linear advection problems. The spectral properties of several convective schemes, including non-linear ones, are discussed. The results show convergence with classical methods on uniform structured meshes, and the proposed method considers the effects on time step depending on the scheme used, ultimately allowing for the proposal of an optimal scheme based on meshing strategy.
COMPUTER PHYSICS COMMUNICATIONS
(2022)
Article
Energy & Fuels
D. Kizildag, J. Castro, H. Kessentini, E. Schillaci, J. Rigola
Summary: This study presents prototypes of highly efficient flat plate solar thermal collectors based on transparent insulation materials (TIM) technology, along with an overheating protection system. The collectors were numerically designed and optimized using a simulation tool, and were tested under laboratory and actual meteorological conditions.
Article
Green & Sustainable Science & Technology
Daniel Santos, Ahmet Azgin, Jesus Castro, Deniz Kizildag, Joaquim Rigola, Bilge Tuncel, Rasit Turan, Rupert Pressmair, Richard Felsberger, Armin Buchroithner
Summary: This paper presents the optimization process of a low-cost custom concentrated photovoltaic thermal (CPV-T) receiver for a parabolic trough collector using silicon solar cells. The heat sink tube geometries were redesigned and tested, showing significant improvement in the overall heat transfer coefficient. The study provides technical support for solar co-generation.
Proceedings Paper
Computer Science, Interdisciplinary Applications
Nestor Balcazar-Arciniega, Joaquim Rigola, Assensi Oliva
Summary: This study presents a direct numerical simulation of mass transfer in a bi-dispersed bubble swarm at high Reynolds number using a multiple marker level-set method. The numerical model improves the numerical stability in bubbly flows with high Reynolds number and high-density ratio.
COMPUTATIONAL SCIENCE, ICCS 2022, PT IV
(2022)
Article
Physics, Fluids & Plasmas
Simone Siriano, Nestor Balcazar, Alessandro Tassone, Joaquim Rigola, Gianfranco Caruso
Summary: The breeding blanket is a crucial component in a nuclear fusion reactor, responsible for fuel production and tritium generation. This study simulated bubble motion in a helium-lead-lithium system using the interIsoFoam solver of OpenFOAM v2012, aiming to explore its potential for fusion applications.
Proceedings Paper
Computer Science, Theory & Methods
Nestor Balcazar-Arciniega, Joaquim Rigola, Assensi Oliva
COMPUTATIONAL SCIENCE - ICCS 2019, PT IV
(2019)
Article
Thermodynamics
Mahsa Taghavi, Swapnil Sharma, Vemuri Balakotaiah
Summary: This study investigates the natural convection effects in the insulation layers of spherical storage tanks and their impact on the tanks' performance. The permeability and Rayleigh number of the insulation material are considered as key factors. The results show that as the Rayleigh number increases, new convective cells emerge and cause the cold boundary to approach the external hot boundary. In the case of large temperature differences, multiple solutions may coexist.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2024)
Article
Thermodynamics
Jinyang Xu, Fangjun Hong, Chaoyang Zhang
Summary: This study introduces a self-induced jet impingement device for enhancing pool boiling performance in high power electronic cooling. Through visualization and parametric investigations, the effects of this device on pool boiling performance are studied, revealing the promotion of additional liquid supply and vapor exhausting. The flow rate of the liquid jet is found to positively impact boiling performance.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2024)
Article
Thermodynamics
Wenchao Ke, Yuan Liu, Fissha Biruke Teshome, Zhi Zeng
Summary: Underwater wet laser welding (UWLW) is a promising and labor-saving repair technique. A thermal multi-phase flow model was developed to study the heat transfer, fluid dynamics, and phase transitions during UWLW. The results show that UWLW creates a water keyhole, making the welding environment similar to in air laser welding.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2024)
Article
Thermodynamics
Xingrong Lian, Lin Tian, Zengyao Li, Xinpeng Zhao
Summary: This study investigates the heat transfer mechanisms in natural fiber-derived porous structures and finds that thermal radiation has a significant impact on the thermal conductivity in low-density regions, while natural convection rarely occurs. Insulation materials derived from micron-sized natural fibers can achieve minimum thermal conductivity at specific densities. Strategies to lower the thermal conductivity include increasing porosity and incorporating nanoscale pores using nanosize fibers.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2024)
Article
Thermodynamics
Yasir A. Malik, Kilian Koebschall, Stephan Bansmer, Cameron Tropea, Jeanette Hussong, Philippe Villedieu
Summary: Ice crystal icing is a significant hazard in aviation, and accurate modeling of sticking efficiency is essential. In this study, icing wind tunnel experiments were conducted to quantify the volumetric liquid water fraction, sticking efficiency, and maximum thickness of ice layers. Two measurement techniques, calorimetry and capacitive measurements, were used to measure the liquid water content and distribution in the ice layers. The experiments showed that increasing wet bulb temperatures and substrate heat flux significantly increased sticking efficiency and maximum ice layer thickness.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2024)
Article
Thermodynamics
Jinqi Hu, Tongtong Geng, Kun Wang, Yuanhong Fan, Chunhua Min, Hsien Chin Su
Summary: This study experimentally examined the heat dissipation of vibrating fans and demonstrated its inherent mechanism through numerical simulation. The results showed that the flow fields induced by the vibrating blades exhibited pulsating features and formed large-scale and small-scale vortical structures, significantly improving heat dissipation. The study also identified the impacts of different blade structures and developed a trapezoidal-folding blade, which effectively reduced the maximum temperature of the heat source and alleviated high-temperature failure crisis.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2024)
Article
Thermodynamics
Dan-Dan Su, Xiao-Bin Li, Hong-Na Zhang, Feng-Chen Li
Summary: The boiling heat transfer of low-boiling-point working fluid is a common heat dissipation technology in electronic equipment cooling. This study analyzed the interfacial boiling behavior of R134a under different conditions and found that factors such as the initial thickness of the liquid film, solid-liquid interaction force, and initial temperature significantly affect the boiling mode and thermal resistance.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2024)
Article
Thermodynamics
Jinyi Wu, Dongke Sun, Wei Chen, Zhenhua Chai
Summary: A unified lattice Boltzmann-phase field scheme is proposed to simulate dendrite growth of binary alloys in the presence of melt convection. The effects of various factors on the growth are investigated numerically, and the model is validated through comparisons and examinations.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2024)
Article
Thermodynamics
Shaokun Ge, Ya Ni, Fubao Zhou, Wangzhaonan Shen, Jia Li, Fengqi Guo, Bobo Shi
Summary: This study investigated the temperature distribution of main cables in a suspension bridge during fire scenarios and proposed a prediction model for the maximum temperature of cables in different lane fires. The results showed that vehicle fires in the emergency lane posed a greater thermal threat to the cables.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2024)
Article
Thermodynamics
Shuang-Ying Wu, Shi-Yao Zhou, Lan Xiao, Jia Luo
Summary: This paper investigates the two-phase flow and heat transfer characteristics of low-velocity jet impacting on a cylindrical surface. The study reveals that the heat transfer regimes are non-phase transition and nucleate boiling with the increase of heat transfer rate. The effects of jet impact height and outlet velocity on local surface temperatures are pronounced at the non-phase transition stage. The growth rates of heat transfer rate and liquid loss rate increase significantly from the non-phase transition to nucleate boiling stage.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2024)
Article
Thermodynamics
Emad Hasani Malekshah, Wlodzimierz Wlodzimierz, Miros law Majkut
Summary: Cavitation has significant practical importance and can be controlled by air injection. This study investigates the natural to ventilated cavitation process around a hydrofoil through numerical and experimental methods. The results show that the location and rate of air injection have a meaningful impact on the characteristics of cavitation.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2024)
Article
Thermodynamics
Feriel Yahiat, Pascale Bouvier, Antoine Beauvillier, Serge Russeil, Christophe Andre, Daniel Bougeard
Summary: This study explores the enhancement of mixing performance in laminar flow equipment by investigating the generation of chaotic advection using wall deformations in annular geometries. The findings demonstrate that the combined geometry can achieve perfect mixing at various Reynolds numbers.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2024)
Article
Thermodynamics
Hui He, Ning Lyu, Caihua Liang, Feng Wang, Xiaosong Zhang
Summary: This study investigates the condensation, frosting, and defrosting processes on superhydrophobic surfaces with millimeter-scale structures. The results reveal that the structures can influence the growth and removal of frost crystals, with the bottom grooves creating a frost-free zone and conical edges promoting higher frost crystal heights. Two effective methods for defrosting are observed: hand-lifting the groove and airfoil retraction contraction on protruding structures. This research provides valuable insights into frost formation and defrosting on millimeter-structured superhydrophobic surfaces, with potential applications in anti-frost engineering.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2024)
Article
Thermodynamics
Thiwanka Arepolage, Christophe Verdy, Thibaut Sylvestre, Aymeric Leray, Sebastien Euphrasie
Summary: This study developed two thermal concentrators, one with a 2D design of uniform thickness and another with a 3D design, using the coordinate transformation technique and metamaterials. By structuring the thermal conductor, the desired local density-heat capacity product and anisotropic thermal conductivities were achieved. The homogenized thermal conductivities were obtained from finite element simulations and cylindrical symmetry consideration. A 3D concentrator was fabricated using 3D metal printing and characterized using a thermal camera. Compared to devices that solely consider anisotropic conductivities, the time evolution characteristics of the metadevice designed with coordinate transformation were closer to those of an ideal concentrator.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2024)
Article
Thermodynamics
Liangyuan Cheng, Qingyang Wang, Jinliang Xu
Summary: In this study, we investigated the supercritical heat transfer of CO2 in a horizontal tube with a diameter of 10.0 mm, covering a wide range of pressures, mass fluxes, and heat fluxes. The study revealed a non-monotonic increase in wall temperatures along the flow direction and observed both positive and negative wall temperature differences between the bottom and top tube. The findings were explained by the thermal conduction in the solid wall interacting with the stratified-wavy flow in the tube.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2024)
