Article
Engineering, Marine
Anna Feichtner, Ed Mackay, Gavin Tabor, Philipp R. Thies, Lars Johanning
Summary: The study investigates the interaction between waves and thin porous structures, finding that three different implementations of macro-scale porosity have similar capabilities in simulating large-scale effects, with isotropic porous media implementation being the most numerically stable and requiring the shortest computation times.
JOURNAL OF MARINE SCIENCE AND ENGINEERING
(2021)
Article
Chemistry, Analytical
Eugen Chiriac, Marioara Avram, Corneliu Balan
Summary: The evolution of an interface between two immiscible liquids in a three-branch symmetric microchannel was investigated numerically and experimentally. The correlation between numerical data and experimental results was analyzed, and the quality of the VOF procedure in tracing the interface was assessed. The study provides a benchmark case for the investigation of interface in a branching microchannel geometry.
Article
Nanoscience & Nanotechnology
Maximilian Fahland, Rohit Mishra
Summary: The generation of droplets in microfluidic systems is widely used in chemical and biological applications. Both actively and passively driven systems are employed for two-phase immiscible micro-droplet formation. In this study, a CFD method was used to model and simulate step-emulsification of water-in-oil on a centrifugal microfluidics platform. The effects of contact angles, supply channel geometry, and capillary number on droplet formation were investigated using the numerical model and compared to experimental data.
MICROFLUIDICS AND NANOFLUIDICS
(2023)
Article
Chemistry, Analytical
Georgia Kontaxi, Yorgos G. Stergiou, Aikaterini A. Mouza
Summary: This study compares the characteristics of bubbles formed in non-Newtonian and Newtonian fluids, finding that the final diameter of the bubbles is influenced by the gas flow rate and liquid phase viscosity. Simulation results indicate that high shear rates around bubbles in non-Newtonian fluids lead to the viscosity approaching its asymptotic value.
Article
Engineering, Multidisciplinary
Amirmahdi Jafari, Amir Shamloo
Summary: This study utilized computational fluid dynamics (CFD) to investigate droplet formation in a square microfluidic cross-junction device. The impact of viscosity ratios on droplet characteristics was examined, with interesting behavior observed in the transition regime between dripping and jetting. The study also explored modifying the outflow channel's design to shift the transition boundary between squeezing and jetting regimes, without altering the operating conditions for both phases.
ENGINEERING APPLICATIONS OF COMPUTATIONAL FLUID MECHANICS
(2023)
Article
Chemistry, Multidisciplinary
Claudia Patricia Durasiewicz, Sophia Thekla Guentner, Philipp Klaus Maier, Wolfgang Hoelzl, Gabriele Schrag
Summary: This study presents a normally open microvalve based on energy-efficient piezoelectric actuation for high closing forces and micromachined valve seat trenches for reliable valve operation for medical applications. Additional valve seat coating and a high force actuator are introduced for further leakage reduction. The microvalve is suitable for the design of safe and reliable microfluidic devices.
APPLIED SCIENCES-BASEL
(2021)
Article
Engineering, Chemical
S. Tomasi Masoni, A. Mariotti, M. Antognoli, C. Galletti, R. Mauri, M. V. Salvetti, E. Brunazzi
Summary: Microreactors, including T-, X- and arrow-shaped devices, are widely used for continuous flow operations. The performance assessment of these devices is crucial for determining optimal geometries and working conditions. The study compares these three geometries and finds that the flow regimes with a central vortex in the mixing channel, observed in X- and arrow-microreactors, achieve the best mixing and reaction yield. In terms of reaction cost, the arrow-microreactor exhibits the lowest pressure drops for higher productivities.
CHEMICAL ENGINEERING RESEARCH & DESIGN
(2023)
Article
Polymer Science
Maryam Fatehifar, Alistair Revell, Masoud Jabbari
Summary: Enhancing the shear-thinning behavior by increasing polymer concentrations in the dispersed phase decreases droplet size and increases detachment time. The choice of a shear-dependent fluid results in decreased droplet size compared to Newtonian fluids, but increased detachment time due to higher apparent viscosity.
Article
Chemistry, Multidisciplinary
Manuel Somoza, Ramon Rial, Zhen Liu, Iago F. Llovo, Rui L. Reis, Jesus Mosqueira, Juan M. Ruso
Summary: This study successfully created doped Hydroxyapatite nanoparticles with magnetic properties using microfluidics and Gadolinium as a contrast agent for medical applications. Computational Fluid Dynamics (CFD) was used to ensure the system worked in the laminar regime and nanoparticles diffused uniformly. The biomaterials were characterized using XRD, FE-SEM, EDX, confocal Raman microscopy, and FT-IR, confirming the successful incorporation of Gadolinium. Magnetic characterization confirmed the paramagnetic behavior of the nanoparticles, showing the potential for advanced nanomaterials in theragnostic applications.
Article
Engineering, Environmental
Rahim Sibil, Egemen Aras, Murat Kankal
Summary: Experimental and numerical studies were conducted to determine the hydrodynamics of full-scale Oxidation Ditches with various turbulence models. The study found that certain turbulence models provided more accurate prediction results. The velocities in the Oxidation Ditches are typically low, and without external forces, the flow field distribution is not uniform, with the maximum wastewater velocities occurring at the inlet and outlet.
PROCESS SAFETY AND ENVIRONMENTAL PROTECTION
(2021)
Article
Energy & Fuels
Mohammad Jahandar Lashaki, Salman Movahedirad, Ahmad Rahbar-Kelishami
Summary: The growing importance of metal separation methods and the shortcomings of conventional solvent extraction techniques have led to increasing attention towards the need for new technology. Microfluidics is considered a suitable choice due to its high mass and heat transfer rate, low material consumption, and small size. This study focused on the solvent extraction of chromium (III) ion using a microchannel, investigating the effect of operating parameters and obtaining optimal extraction conditions. The results showed that microfluidic extraction had better mass transfer performance, and CFD simulations agreed well with experimental results in terms of internal flow and extraction efficiency.
CHEMICAL ENGINEERING AND PROCESSING-PROCESS INTENSIFICATION
(2022)
Article
Engineering, Civil
Alexander L. Brown, Michael D. Clemenson, Michael Benson, Christopher Elkins, Samuel T. Jones
Summary: Momentum, advection, diffusion, and turbulence are component physics related to fire simulation tools like computational fluid dynamics (CFD). Magnetic Resonance Velocimetry and Magnetic Resonance Concentration techniques can provide detailed measurements of three-component velocity and concentration fields in turbulent flows. This study compares 3D flow between velocity and concentration fields obtained using different measurement techniques for urban geometry, showing good consistency between model and experimental results.
FIRE SAFETY JOURNAL
(2021)
Article
Engineering, Aerospace
Lorenzo Pinelli, Corrado Burberi, Mirko Ignesti, Vittorio Michelassi, Libero Tapinassi, Alessandro Abati, Roberto Pacciani
Summary: This paper presents the application of a forced response prediction process to an industrial axial compressor, and validates it with experimental data. The process decomposes the unsteady aerodynamic forcing from URANS analyses and uses the interference diagram to detect additional acoustic forcing. Unexpected resonances during compressor validation tests often require redesigns. The theory is validated with 3D unsteady simulations and shows good agreement with measurements.
AEROSPACE SCIENCE AND TECHNOLOGY
(2023)
Article
Electrochemistry
Thomas Abadie, Christelle Souprayen, Catherine Sella, Laurent Thouin
Summary: The study focused on a cross-channel geometry to quantitatively electrolyze circulating droplets without interference from the counter electrode reaction. By placing the counter electrode in a secondary microchannel in microdevices, the contact with the droplets during detection was prevented. Theoretical and experimental assessments of electrochemical performance showed that under optimal conditions, quantitative electrolysis of droplet contents can be achieved when the working electrode operates in a thin-layer regime.
ELECTROCHIMICA ACTA
(2021)
Article
Energy & Fuels
Jun Yin, Simon Kuhn
Summary: Taylor flow in microchannels is characterized by significantly higher interfacial mass transfer rates compared to conventional reactors. Vortices observed during the droplet formation stage contribute further to interfacial mass transfer. This study quantifies the contribution of the droplet formation stage to overall mass transfer and finds that it depends solely on vortex intensity. Changing flow rate ratio and viscosity also have a significant impact on interfacial mass transfer performance. These findings are important for applications involving interfacial mass transfer in microchannels.
CHEMICAL ENGINEERING AND PROCESSING-PROCESS INTENSIFICATION
(2023)
Article
Multidisciplinary Sciences
Dayinta L. Perrier, Lea Rems, Michiel T. Kreutzer, Pouyan E. Boukany
SCIENTIFIC REPORTS
(2018)
Article
Physics, Fluids & Plasmas
Michiel T. Kreutzer, Maulik S. Shah, Pravien Parthiban, Saif A. Khan
PHYSICAL REVIEW FLUIDS
(2018)
Review
Engineering, Chemical
Aura Visan, J. Ruud van Ommen, Michiel T. Kreutzer, Rob G. H. Lammertink
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
(2019)
Article
Physics, Fluids & Plasmas
Cees Haringa, Conrad de Jong, Duong A. Hoang, Luis M. Portela, Chris R. Kleijn, Michiel T. Kreutzer, Volkert van Steijn
PHYSICAL REVIEW FLUIDS
(2019)
Article
Multidisciplinary Sciences
Dayinta L. Perrier, Afshin Vahid, Vaishnavi Kathavi, Lotte Stam, Lea Rems, Yuval Mulla, Aswin Muralidharan, Gijsje H. Koenderink, Michiel T. Kreutzer, Pouyan E. Boukany
SCIENTIFIC REPORTS
(2019)
Article
Mechanics
Maulik S. Shah, Volkert van Steijn, Chris R. Kleijn, Michiel T. Kreutzer
JOURNAL OF FLUID MECHANICS
(2019)
Article
Biochemistry & Molecular Biology
Shaurya Sachdev, Sara Feijoo Moreira, Yasmine Keehnen, Lea Rems, Michiel T. Kreutzer, Pouyan E. Boukany
BIOCHIMICA ET BIOPHYSICA ACTA-BIOMEMBRANES
(2020)
Article
Chemistry, Physical
Dominik Benz, Kevin M. Felter, Jan Koeser, Jorg Thoeming, Guido Mul, Ferdinand C. Grozema, Hubertus T. Hintzen, Michiel T. Kreutzer, J. Ruud van Ommen
JOURNAL OF PHYSICAL CHEMISTRY C
(2020)
Article
Chemistry, Multidisciplinary
Dominik Benz, Hao Van Bui, Hubertus T. Hintzen, Michiel T. Kreutzer, J. Ruud van Ommen
Article
Biochemistry & Molecular Biology
Aswin Muralidharan, Lea Rems, Michiel T. Kreutzer, Pouyan E. Boukany
Summary: In electroporation, disruption of actin networks influences cell membrane permeability, leading to increased uptake of membrane-impermeable molecules with higher temperatures. This suggests a potential lowering of the activation energy barrier for electroporation when actin networks are disrupted, emphasizing the importance of cytoskeletal networks in understanding cell membrane permeability during the delivery of exogenous substances.
BIOCHIMICA ET BIOPHYSICA ACTA-BIOMEMBRANES
(2021)
Article
Materials Science, Multidisciplinary
Kartik Totlani, Yen-Chieh Wang, Maxime Bisschops, Thorben de Riese, Michiel T. Kreutzer, Walter M. van Gulik, Volkert van Steijn
Summary: This study addresses a key bottleneck in bioprocess development by developing a droplet-based fed-batch nanobioreactor. The ability to study micro-organisms under nutrient-controlled fed-batch conditions is demonstrated, offering a solid platform technology for further development and use in the field of bioprocess development and beyond.
ADVANCED MATERIALS TECHNOLOGIES
(2021)
Article
Chemistry, Physical
Shaurya Sachdev, Aswin Muralidharan, Dipendra K. Choudhary, Dayinta L. Perrier, Lea Rems, Michiel T. Kreutzer, Pouyan E. Boukany
Article
Chemistry, Multidisciplinary
Nathalie Marquez, Jacob A. Moulijn, Michiel Makkee, Michiel T. Kreutzer, Pedro Castano
REACTION CHEMISTRY & ENGINEERING
(2019)
Article
Chemistry, Physical
Matija Lovrak, Wouter E. Hendriksen, Michiel T. Kreutzer, Volkert van Steijn, Rienk Eelkema, Jan H. van Esch
Article
Biochemical Research Methods
Kartik Totlani, Jan-Willem Hurkmans, Walter M. van Gulik, Michiel T. Kreutzer, Volkert van Steijn
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)
