Article
Engineering, Multidisciplinary
Matthew Wilkinson, Javier Villarreal, Andrew Meade
Summary: SOMA is a meshless and matrix-free fluid dynamics solver that eliminates the need for user-generated grids, volumes, and meshes. By incrementally building the approximation, dense block diagonal matrices are avoided and user interaction is significantly reduced. Validation results demonstrate the effectiveness of SOMA in subsonic, compressible, and turbulent flow over an adiabatic flat plate.
CMES-COMPUTER MODELING IN ENGINEERING & SCIENCES
(2021)
Article
Engineering, Multidisciplinary
Michel Bergmann
Summary: A computational model was developed to investigate the jump of a self-propelled dolphin out of water, using Navier-Stokes equations for fluid-structure coupling and volume penalization method for modeling. The study found that large propulsive forces are necessary for the dolphin to jump out of water, with its trajectory following a purely ballistic path when out of water.
BIOINSPIRATION & BIOMIMETICS
(2022)
Article
Mechanics
L. Chupin, T. Dubois, M. Phan, O. Roche
Summary: This study presents numerical simulations of the collapse of glass bead columns with different aspect ratios using a new two-phase bi-projection scheme, and compares the results with experiments. The granular flow is modeled using a viscoplastic rheology based on the mu(I)-rheology, resulting in a Drucker-Prager plasticity criterion. The study also investigates the sensitivity of results to resolution and basal friction coefficient.
JOURNAL OF NON-NEWTONIAN FLUID MECHANICS
(2021)
Article
Mechanics
C. Chan, P. Schlatter, R. C. Chin
Summary: The flow physics of turbulent boundary layers was investigated using spectral analysis based on the spanwise scale decomposition of the Reynolds stress transport equation with data obtained from direct numerical simulation. The study revealed evidence of inverse turbulent kinetic energy transfer occurring in the near-wall region, as well as inverse transfer of Reynolds shear stress transport across the entire boundary layer. Interactions between large-scale structures and the free stream flow were also observed at the edge of the boundary layer.
JOURNAL OF FLUID MECHANICS
(2021)
Article
Thermodynamics
Pedro M. Milani, Julia Ling, John K. Eaton
Summary: This study explores the application of Reynolds-averaged Navier Stokes (RANS) models using a newly developed machine learning turbulence closure model, TBNN-s, for passive scalar transport. The TBNN-s shows significant improvements in the mean scalar field when trained and tested in the same class of flow, and performs similarly to the baseline model when tested across different classes of flows, demonstrating the potential of the new model in generalization.
INTERNATIONAL COMMUNICATIONS IN HEAT AND MASS TRANSFER
(2021)
Article
Mechanics
Jing Wang, Hairun Xie, Miao Zhang, Hui Xu
Summary: In this paper, a Physics-Assisted Variational Autoencoder is proposed to identify dominant features of transonic buffet, which combines unsupervised reduced-order modeling with additional physical information embedded via a buffet classifier. Statistical results reveal that the buffet state can be determined exactly with just one latent space when a proper weight of classifier is chosen. Based on this identification, the displacement thickness at 80% chordwise location is proposed as a metric for buffet prediction, achieving an accuracy of 98.5% in buffet state classification.
Article
Mathematics, Applied
Juan Vicente Gutierrez-Santacreu, Marko Antonio Rojas-Medar
Summary: The Navier-Stokes-alpha equations are a type of LES models that aim to capture the influence of small scales on large ones without calculating the entire flow range. The parameter α represents the smallest resolvable scale by the model. When α=0, the classical Navier-Stokes equations for viscous, incompressible, Newtonian fluids are recovered. These equations can also be seen as a regularization of the Navier-Stokes equations, where α stands for the regularization parameter.
PHYSICA D-NONLINEAR PHENOMENA
(2023)
Article
Mechanics
Artem N. Nuriev, Andrey G. Egorov, Ayrat M. Kamalutdinov
Summary: This paper investigates the periodic rectilinear motion of an elliptic cylinder at an arbitrary angle of attack in a viscous incompressible fluid according to an arbitrary multi-harmonic law. The study develops the classical method of inner and outer asymptotic expansions to determine the hydrodynamic force acting on the cylinder, considering parameters such as the thickness of the Stokes boundary layer and the Reynolds number.
JOURNAL OF FLUID MECHANICS
(2021)
Article
Mechanics
Vilas J. Shinde, Datta Gaitonde
Summary: The text discusses common modal decomposition techniques for flow-field analysis, data-driven modeling, and flow control, and introduces a Lagrangian modal analysis approach to address the challenges posed by Eulerian descriptions. By verifying the development with simulations, the Lagrangian modal analysis is shown to provide insights into flow stability and dynamics, leading to coherent flow structures and connections with finite-time Lyapunov exponents.
JOURNAL OF FLUID MECHANICS
(2021)
Article
Engineering, Aerospace
Zachary Robison, John-Paul Mosele, Andreas Gross, Stephen Lynch
Summary: Turbulent junction flows exhibit a bimodal behavior of the horseshoe vortex, possibly triggered by the turbulent boundary layer. Simulations show that different shapes of circular endwall fillets can suppress the bimodal behavior as suggested by previous studies.
Article
Physics, Multidisciplinary
Martin Machacek
Summary: In this paper, we present a method for calculating the invariant measure of hydrodynamical systems describing incompressible viscous fluid flow in a bounded 3D volume. We transform the Navier-Stokes equations into a simple system of ordinary differential equations and prove the existence and uniqueness of the invariant measure. We also suggest methods for numerically solving the resulting system of linear algebraic equations. The proposed method is illustrated using cylindrical pipe flow.
Article
Geochemistry & Geophysics
M. Coco, E. Marchetti, O. Morandi
Summary: Debris flows in Alpine regions are a severe natural hazard, and studies are being conducted to understand their predictability and to identify early warning systems based on seismic and infrasound waves. Numerical simulations show that infrasound is mainly radiated downstream of dams with amplitude and period scaling with dam height and water level. Results from this study are generally in agreement with experimental data from array analysis of infrasound recorded in Switzerland.
PURE AND APPLIED GEOPHYSICS
(2021)
Article
Engineering, Civil
Hongjie Gao, Xinyu Li, Abdolreza Hooshmandi Nezhad, Amir Behshad
Summary: The objective of this study is to simulate flow in pipes with different boundary conditions. The flow is modeled using the free-pressure fluid model based on the Navier-Stokes equation, and numerical methods are used to solve the models. A problem called stability of pipes is used to compare frequency and critical fluid velocity. The results show that the level of numerical diffusion and the range of well-posedness are important criteria for selecting two-fluid models.
STRUCTURAL ENGINEERING AND MECHANICS
(2022)
Article
Mathematics, Applied
Jad Doghman, Ludovic Goudenege
Summary: The primary focus of this research is the development of a finite element based space-time discretization method for solving the stochastic Lagrangian averaged Navier-Stokes equations in incompressible fluid turbulence. Convergence analysis shows that convergence to continuous strong solutions is achieved when alpha approaches zero or when alpha is fixed.
JOURNAL OF COMPUTATIONAL AND APPLIED MATHEMATICS
(2022)
Article
Mathematics, Applied
John D. Gibbon
Summary: The rich multifractal properties of fluid turbulence are related to Leray's weak solutions of the three-dimensional Navier-Stokes equations, as shown by Parisi and Frisch. They found that the set on which energy dissipates, Fm, has dimensions Dm = 3/m (1 < m < oo), and a corresponding range of sub-Kolmogorov dissipation inverse length scales L eta m-1 < Re3/(1+Dm) spanning Re3/4 to Re3. Additionally, the multifractal model scaling parameter h must satisfy h > hmin with -23 < hmin < 13.
PHYSICA D-NONLINEAR PHENOMENA
(2023)
Review
Green & Sustainable Science & Technology
Svetlana Stevovic, Zorica Milovanovic, Milan Stamatovic
RENEWABLE & SUSTAINABLE ENERGY REVIEWS
(2015)
Review
Green & Sustainable Science & Technology
Goran Cesljar, Svetlana Stevovic
RENEWABLE & SUSTAINABLE ENERGY REVIEWS
(2015)
Article
Nuclear Science & Technology
Jelena S. Markovic, Svetlana M. Stevovic, Mitica M. Rajacic, Dragana J. Todorovic, Jelena D. Krneta-Nikolic
NUCLEAR TECHNOLOGY & RADIATION PROTECTION
(2016)
Article
Construction & Building Technology
Jovana Jovanovic, Xiaoqin Sun, Svetlana Stevovic, Jian Chen
ENERGY AND BUILDINGS
(2017)
Article
Engineering, Environmental
Svetlana Stevovic, Zarko Nestorovic, Mitar Lutovac
WATER SCIENCE AND TECHNOLOGY-WATER SUPPLY
(2018)
Article
Thermodynamics
Hranislav Milosevic, Namik Ahmetovich Geydarov, Yuriy Nikolaevich Zakharov, Svetlana Stevovic
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2013)
Article
Thermodynamics
Svetlana M. Stevovic, Zorica D. Milovanovic, Aleksandar V. Milajic
Article
Engineering, Mechanical
S. Stevovic, Z. Nestorovic, M. Lutovac
SPECIAL TOPICS & REVIEWS IN POROUS MEDIA-AN INTERNATIONAL JOURNAL
(2017)
Proceedings Paper
Engineering, Multidisciplinary
Svetlana Stevovic, Zarko Nestorovic
INTERNATIONAL CONFERENCE ON EFFICIENT & SUSTAINABLE WATER SYSTEMS MANAGEMENT TOWARD WORTH LIVING DEVELOPMENT (2ND EWAS 2016)
(2016)
Proceedings Paper
Engineering, Multidisciplinary
Svetlana Stevovic, Zarko Nestorovic
INTERNATIONAL CONFERENCE ON EFFICIENT & SUSTAINABLE WATER SYSTEMS MANAGEMENT TOWARD WORTH LIVING DEVELOPMENT (2ND EWAS 2016)
(2016)
Article
Biotechnology & Applied Microbiology
Svetlana Stevovic, Vesna Surcinski Mikovilovic, Dusica Calic-Dragosavac
AFRICAN JOURNAL OF BIOTECHNOLOGY
(2010)
Article
Biotechnology & Applied Microbiology
Svetlana Stevovic, Vesna Surcinski Mikovilovic, Dusica Calic-Dragosavac
AFRICAN JOURNAL OF BIOTECHNOLOGY
(2010)
Article
Environmental Studies
Ivan Stevovic, Jovana Jovanovic, Svetlana Stevovic
MANAGEMENT OF ENVIRONMENTAL QUALITY
(2017)
Article
Environmental Studies
Svetlana Stevovic, Milica Miloradovic, Ivan Stevovic
MANAGEMENT OF ENVIRONMENTAL QUALITY
(2014)
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)
