Article
Mechanics
Chongpei Chen, Jianhan Liang, Tianyun Gao, Xiaoshuai Wu, Wandong Zhao, Lin Zhang
Summary: One-dimensional turbulence (ODT) is an efficient stochastic methodology for simulating turbulent flows with dimensionality reduction. In this study, a conservative compressible ODT model is developed and applied to accurately model high-Reynolds-number wall-bounded compressible turbulent flows. The model is validated by comparing its results with canonical direct numerical simulation (DNS) results. The proposed model captures the turbulent features of fully developed channel flows at a wide range of Reynolds numbers, and reveals the mechanism behind Reynolds number effects by analyzing interactions between multiscale eddy events.
Article
Mathematics, Applied
Adam Kajzer, Jacek Pozorski
Summary: This article presents an approach to simulate low speed, two-phase interfacial flows using the diffuse-interface method and the conservative Allen-Cahn equation. The method is computationally efficient for treating incompressible flow and conserves mass and momentum. It is easily implemented in existing numerical codes and can be efficiently executed using parallel computing devices.
COMPUTERS & MATHEMATICS WITH APPLICATIONS
(2022)
Article
Mechanics
Tingting Li, Zhiwen Cui, Xianxu Yuan, Ying Zhang, Qiang Zhou, Lihao Zhao
Summary: In this study, we conducted direct numerical simulations to investigate the behavior of particle suspensions in compressible turbulent vertical channel flows. We found that the compressibility effect amplifies the mean velocity, fluctuations, and slip velocity of particles in the streamwise direction. Additionally, the wall-normal and spanwise fluctuations of particle velocities are augmented by the compressible effect in the channel core region. The quadrant analysis of fluid fluctuation velocities at particle positions revealed preferential distributions in certain quadrants, indicating the influence of compressible flows on particle wall-normal transport.
Article
Mechanics
Wenwu Chen, Lin Zhang, Zhiqiang Zhang, Qingdi Guan
Summary: This paper proposes a joint subgrid velocity-scalar filtered mass density function (VSGSSFMDF) method to address errors in subgrid-scale scalar flux modeling in large eddy simulations (LESs). The proposed method is shown to effectively simulate the counter-gradient scalar transport effect, producing better results than other existing methods.
Article
Physics, Fluids & Plasmas
Cheng Cheng, Wei Shyy, Lin Fu
Summary: In this study, the statistical characteristics of momentum and heat fluxes in subsonic or supersonic channel flows are investigated. The effects of inner-outer scale interactions on these fluxes in the near-wall and logarithmic regions are clarified. The findings contribute to the development of modeling approaches for compressible wall turbulence.
PHYSICAL REVIEW FLUIDS
(2023)
Article
Computer Science, Interdisciplinary Applications
Youngdae Kim, Debojyoti Ghosh, Emil M. Constantinescu, Ramesh Balakrishnan
Summary: This paper explores strategies for transforming an existing CPU-based high-performance computational fluid dynamics solver, HYPAR, into a version enhanced with GPU for use on emerging exascale heterogeneous computing platforms. The study shows that optimizing memory operations and thread blocks can result in a speedup of 200 times compared to a CPU core for computationally intensive kernels. The GPU-based HYPAR implementation on NVIDIA Volta V100 GPUs demonstrates both strong and weak scaling through the use of multiple GPUs and CUDA-aware MPI communication.
COMPUTERS & FLUIDS
(2023)
Article
Physics, Multidisciplinary
Fangying Song, George Em Karniadakis
Summary: Modeling wall-bounded turbulent flows using fractional calculus, a fundamentally new approach, revealed a universal form of variable fractional order for all Reynolds numbers and three different flow types. Continuous changes in turbulent diffusion rate from the wall and strong nonlocality of turbulent interactions intensifying away from the wall were discovered through the study, which utilized existing databases and experimental measurements.
Article
Multidisciplinary Sciences
Kevin Patrick Griffin, Lin Fu, Parviz Moin
Summary: A transformation method mapping compressible wall-bounded turbulent flows to the incompressible law of the wall has been proposed, successfully collapsing numerical simulation data from various flows without specific tuning. The transformation is successful across the entire inner layer of the boundary layer, verifying its performance for compressible wall-bounded flows.
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
(2021)
Article
Mechanics
Jie Yao, Fazle Hussain
Summary: Compressible turbulent plane Couette flows with high Reynolds and Mach numbers were studied through direct numerical simulation. Various turbulence statistics were compared with incompressible flows. The skin friction coefficient decreases with Reynolds number but weakly depends on Mach number. The thermodynamic properties show significant variations with Mach number. Proper scaling transformations collapse the mean velocity profiles for compressible and incompressible cases well. Semilocal units yield a better collapse for Reynolds stress profiles compared to wall units. The length scale of near-wall coherent structures and the strength of the superstructures increase with Reynolds number. The streamwise coherence of the superstructures degrades with increasing Mach number.
JOURNAL OF FLUID MECHANICS
(2023)
Article
Physics, Fluids & Plasmas
Peng Zhang, Yubin Song, Yilang Liu, Zhenhua Xia
Summary: This study investigates the equivalence of different thermal boundary conditions in compressible turbulent channel flows. The results show that the three thermal boundary conditions have almost negligible effect on the velocity field, whereas some discernible deviations can be observed for the temperature field in the near-wall region.
Article
Optics
V. Sridhar, K. Hiraki, S. L. Gai, H. Kleine
Summary: This paper discusses the characteristics, advantages, and limitations of a digital version of the traditional streak imaging technique combined with various flow visualization methods. It also presents several applications in fluid mechanics. Streak images are useful for tracking and quantifying the development and propagation of different flow features over time and can graphically reveal the onset of certain flow phenomena. The digital technique also has the ability to filter and display less prominent elements of the flow.
OPTICS AND LASERS IN ENGINEERING
(2023)
Article
Mechanics
S. Arun, A. Sameen, Balaji Srinivasan, Sharath S. Girimaji
Summary: This study examines the definition and transport equation of the scale-space energy density function for compressible flows. It first defines the energy density function and then analyzes data from mixing layers to study the scale-space behavior at different Mach numbers. The research shows that production is influenced by long-distance interactions, whereas pressure dilatation effects are more localized.
JOURNAL OF FLUID MECHANICS
(2021)
Article
Thermodynamics
Changchang Wang, Guoyu Wang, Mindi Zhang, Biao Huang
Summary: This study investigates the wall pressure fluctuations in compressible turbulent cavitating flows, focusing on their non-Gaussian behaviors and physical mechanisms. The results show that the fluctuations exhibit positive skewness, which is independent of the cavity regime. However, there are differences in the fluctuating pressure signals under different cavity regimes. The Hilbert-Huang transform is used to analyze the fluctuations in cloud cavitation and a physical model based on cavitation bubble dynamics is proposed.
EXPERIMENTAL THERMAL AND FLUID SCIENCE
(2022)
Article
Engineering, Aerospace
Tianyi Bai, Kevin P. Griffin, Lin Fu
Summary: This study assessed the performance of several popular velocity profile transformations in noncanonical compressible wall-bounded turbulent flows. It was found that these transformations fail to deliver uniform performance in the logarithmic region and a more sophisticated version is needed. However, data-driven and total-stress-based transformations perform well in the viscous sublayer for all considered flows.
Article
Computer Science, Interdisciplinary Applications
J. Reynaud, P. E. Weiss, S. Deck, P. Guillen
Summary: This paper presents a strategy for scale-resolving simulations of bi-species turbulent flows using a combination of Zonal Detached Eddy Simulation (ZDES) and an original low dissipative version of the AUSM scheme. By adapting the dissipation to flow discontinuities and maintaining a low numerical dissipation level in resolved turbulence regions, this strategy improves the prediction of mixing processes by considering resolved turbulence in the incoming attached boundary layers.
JOURNAL OF COMPUTATIONAL PHYSICS
(2022)
Article
Thermodynamics
Matt Edmunds, Alison J. Williams, Ian Masters, Arindam Banerjee, James H. VanZwieten
Article
Mathematics, Applied
Denis Aslangil, Daniel Livescu, Arindam Banerjee
PHYSICA D-NONLINEAR PHENOMENA
(2020)
Article
Mechanics
Denis Aslangil, Daniel Livescu, Arindam Banerjee
JOURNAL OF FLUID MECHANICS
(2020)
Article
Biophysics
Rahul R. Rajendran, Arindam Banerjee
Summary: Mucus hypersecretion is a common pathophysiological manifestation of obstructive airway diseases. Airflow generated by cough or forced expiratory maneuvers is responsible for clearing mucus, a complex process influenced by factors such as mucus rheology, airflow rate, airway geometry, and gravity. The study found that mucus rheology plays a crucial role in the transport and distribution of mucus in airway geometries, with gravity, airflow rate, and geometry also impacting mucus clearance.
JOURNAL OF BIOMECHANICAL ENGINEERING-TRANSACTIONS OF THE ASME
(2021)
Article
Engineering, Mechanical
Arindam Banerjee
JOURNAL OF FLUIDS ENGINEERING-TRANSACTIONS OF THE ASME
(2020)
Article
Engineering, Mechanical
Denis Aslangil, Zachary Farley, Andrew G. W. Lawrie, Arindam Banerjee
JOURNAL OF FLUIDS ENGINEERING-TRANSACTIONS OF THE ASME
(2020)
Editorial Material
Engineering, Mechanical
Arindam Banerjee, Praveen Ramaprabhu, Devesh Ranjan, Daniel Livescu, Oleg Schilling
JOURNAL OF FLUIDS ENGINEERING-TRANSACTIONS OF THE ASME
(2020)
Article
Green & Sustainable Science & Technology
Mertcan Yetkin, Sudharsan Kalidoss, Frank E. Curtis, Lawrence V. Snyder, Arindam Banerjee
Summary: This study presents a generic formulation for the optimal control of a single reacting two-body point absorber type wave energy converter, which involves constraints on the motion of the device to improve its durability. To ensure actual energy gains, a penalty term is incorporated in the objective function to approximate the cost of control force.
Article
Green & Sustainable Science & Technology
Ashwin Vinod, Cong Han, Arindam Banerjee
Summary: Tidal stream turbines in high-energy tidal sites are affected by turbulent non-homogeneous flow environments, particularly the shear effects caused by turbulent inflow that reduce the power coefficient. The study results show that sheared turbulent inflows lead to increased torque and thrust fluctuations in the turbine model, asymmetry in the near-wake, and gradual effects on wake turbulence and velocity deficit.
Article
Energy & Fuels
Xingchao Wang, Chunjian Pan, Carlos E. Romero, Zongliang Qiao, Arindam Banerjee, Carlos Rubio-Maya, Lehua Pan
Summary: A comprehensive thermo-economic model was proposed in this study, combining a geothermal heat mining system and a direct supercritical CO2 turbine expansion electric power generation system. Through analysis of the system design parameters, the minimal levelized cost of electricity was obtained. The impact of CO2 sequestration credit on the economic costs of geothermal power plants was also discussed in the research.
FRONTIERS IN ENERGY
(2022)
Article
Engineering, Chemical
Rahul R. Rajendran, Sathyanand Kumaran, Arindam Banerjee, Ariel Berlinski
Summary: An integrated approach combining in vitro and in silico methods was used to study albuterol administration in adult lung airways. The study found that a vibrating mesh nebulizer produced a larger lung dose compared to a jet nebulizer, with aerosol characteristics dependent on nebulizer position. Computational fluid dynamics analysis showed that the vibrating mesh nebulizer placed at the ventilator had better efficacy, and drug administration through endotracheal intubation was more efficient.
JOURNAL OF AEROSOL SCIENCE
(2021)
Article
Engineering, Marine
Sudharsan Kalidoss, Arindam Banerjee
Summary: The study explores the impact of device geometry of a self-reacting point absorber (SRPA) on real wave spectra with multiple peaks, showing that different designs can alter the cut-off frequency of the SRPA to extract more power.
Article
Green & Sustainable Science & Technology
Pranav K. Modali, Ashwin Vinod, Arindam Banerjee
Summary: The study found that implementing wake steering in tidal stream turbine arrays can enhance energy recovery efficiency and reduce spacing between turbine units in the array.
Article
Green & Sustainable Science & Technology
Kai He, Ashwin Vinod, Arindam Banerjee
Summary: Passive turbulence control using strips on cylinders has been studied for over 30 years, with a focus on the effects of thickness and roughness on energy extraction. Experimental results show that smoother configurations generate higher power with better stability, making them more suitable for low velocity environments.
Article
Physics, Fluids & Plasmas
Denis Aslangil, Andrew G. W. Lawrie, Arindam Banerjee
Summary: This study investigates the dynamics of an initially Rayleigh-Taylor unstable interfacial flow that becomes statically stable for a period of time due to the reversal of the externally imposed acceleration field. The effects of single and double-acceleration reversals are discussed. The response of the mixing layer is shown to depend on the duration and periodicity of the deceleration period during the second acceleration reversal.
