Article
Computer Science, Interdisciplinary Applications
Jeremy Ims, Z. J. Wang
Summary: We employ a discontinuous high-order method to assess three error indicators aimed at mesh adaptation in large eddy simulation (LES). These indicators are formulated based on specific physical and numerical reasoning. The first indicator is governed by the unsteady residual, the second indicator relies on a local smoothness indicator, and the third one is built upon an estimation for small scale turbulent kinetic energy. We examine the three error indicators by driving autonomous mesh refinement in implicit LES and evaluate their efficacy in reducing solution error by comparing them against direct numerical simulation (DNS) results in two commonly used benchmark simulations of T106 LP turbine cascade.
JOURNAL OF COMPUTATIONAL PHYSICS
(2023)
Article
Computer Science, Interdisciplinary Applications
Yi Liu, Hongping Wang, Shizhao Wang, Guowei He
Summary: Unstructured meshes provide advantages in handling complex geometries, but low cache utilization poses challenges for high computing efficiency in large-eddy simulations. We propose a geometrical-based mesh reordering method that uses a Hilbert space-filling curve to guide the reordering of cells, aiming to improve cache utilization. The method significantly improves data localities and computing efficiency.
JOURNAL OF COMPUTATIONAL PHYSICS
(2023)
Article
Mechanics
P. W. Agostinelli, B. Rochette, D. Laera, J. Dombard, B. Cuenot, L. Gicquel
Summary: The study proposes a static mesh refinement strategy based on flow physical quantities, detecting areas of interest for flow physics and recommending grid adaptation to enhance the accuracy of large eddy simulations. The strategy is detailed on two reacting-flow problems and shown to significantly improve predictions of flame stabilization.
Article
Engineering, Civil
Yong Wang, Xinzhong Chen
Summary: This study validates the accuracy of large-eddy simulation of wind pressures and loads on high-rise buildings at various angles of attack, and proposes local octree mesh refinement as an efficient strategy to improve simulation accuracy.
JOURNAL OF WIND ENGINEERING AND INDUSTRIAL AERODYNAMICS
(2022)
Article
Construction & Building Technology
Yezhan Li, Wei Wang, Tsubasa Okaze
Summary: The urban heat island effect has become a noticeable issue in recent years. Research has been conducted to understand the thermal field around buildings and improve human comfort in urban areas. However, challenges remain regarding the accuracy and cost of transient simulations of the urban thermal environment.
BUILDING AND ENVIRONMENT
(2023)
Article
Mechanics
Zhideng Zhou, Xiang I. A. Yang, Fengshun Zhang, Xiaolei Yang
Summary: In this study, a wall model is developed using the wall-resolved large-eddy simulation (WRLES) data of flow over periodic hills (PH) and the law of the wall (LoW) for data-driven wall-modeled large-eddy simulations of various wall-bounded turbulent flows. A feedforward neural network (FNN) is employed to construct the model. The performance of the obtained FNN_PH-LoW model is successfully evaluated using the direct numerical simulation data of turbulent channel flows and the WRLES data of PH cases, and it is applied to turbulent channel flows with a wide range of Reynolds numbers.
Article
Engineering, Chemical
Tomislav Sencic, Vedran Mrzljak, Vedran Medica-Viola, Igor Wolf
Summary: The scavenging process is crucial for the operation of two-stroke engines, and its efficiency greatly impacts engine performance and emissions. Through a combination of CFD modeling and experimental data analysis, this study examined the scavenging performance of a slow speed marine diesel engine. The findings highlight the influence of engine load, pressure difference between the exhaust and scavenging ports, and angle of the scavenging ports on scavenging efficiency.
Article
Engineering, Chemical
Boyang Chen, Bruno Fraga, Hassan Hemida
Summary: Bubble-induced turbulence enhances mixing and diffusivity by increasing agitation in the continuous phase. When compared with different aerator setups, bubble screens show better performance, being more efficient than increasing the gas flow rate.
CHEMICAL ENGINEERING RESEARCH & DESIGN
(2022)
Article
Thermodynamics
Leandro J. L. Stival, Joshua R. Brinkerhoff, Joao Marcelo Vedovotto, Fernando Oliveira de Andrade
Summary: This study applies large eddy simulation (LES) and immersed boundary (IB) method to investigate the flow around wind turbines and validates the results. The research shows that there is a significant loss of kinetic energy in the near wake region of the wind turbine, but the results are similar to the literature in the far wake region.
ENERGY CONVERSION AND MANAGEMENT
(2022)
Article
Engineering, Mechanical
Ming Yu, Yalu Fu, Pengxin Liu, Zhigong Tang, Xianxu Yuan, Chunxiao Xu
Summary: A hybrid numerical method is proposed for compressible wall-bounded turbulence in this study, which utilizes different schemes to resolve the convective term in different regions and effectively predicts turbulence properties while maintaining numerical stability.
ACTA MECHANICA SINICA
(2022)
Article
Engineering, Marine
Yongyao Luo, Ran Tao, Guangjie Peng
Summary: This study investigates the starting process of the OWC impulse turbine rotor and its dynamic motion through numerical simulation and experimental comparison. The study identifies two stages of the starting process and the physical characteristics of the rotor during rotation. The study also reveals the influence of rotor moment of inertia, wave motion law, and compressibility on the performance of the turbine. The findings provide important guidance for enhancing the performance and improving the design technique of OWC impulse turbines.
Article
Engineering, Aerospace
Mohammad Khalid Hossen, Asokan Mulayath Variyath, Jahrul M. Alam
Summary: This study investigates the statistical characteristics of vortex stretching in Large Eddy Simulation (LES) and finds that the stretching rate provides the necessary energy dissipation rate for modeling subgrid-scale turbulence. By comparing the interaction of subgrid stresses with filtered quantities, it is revealed that the stretching mechanism extracts energy from large-scale motion and transfers it to small-scale stretched vortices.
Article
Thermodynamics
Danyal Mohaddes, Philipp Boettcher, Matthias Ihme
Summary: This study investigates the thermal ignition of liquid n-dodecane fuel spray on a hot surface, focusing on ignition characteristics and flame propagation mechanisms in different temperature regimes. Through experimental simulation, fundamental understanding of the physical phenomena involved in the process is provided towards the goal of improved industrial safety.
COMBUSTION AND FLAME
(2021)
Article
Engineering, Aerospace
Zhen Li, Yaping Ju, Chuhua Zhang
Summary: This study develops a quasi-wall-resolved large eddy simulation (LES) method for the analysis of laminar-turbulent transition in axial-flow compressors. The results show reasonable agreement between the predicted aerodynamic performance and the measured data, validating the QWRLES method and providing insights into the transition mechanism.
AEROSPACE SCIENCE AND TECHNOLOGY
(2022)
Article
Construction & Building Technology
S. Iousef, H. Montazeri, B. Blocken, P. J. V. van Wesemael
Summary: This study evaluates the performance of wall modeled (WM) and wall-resolved (WR) large eddy simulation (LES) methods for flow and thermal field at the facades of a low-rise building. The results show significant deviations in the predicted near-facade flow pattern and surface convective heat transfer coefficient (CHTC) with the use of WM-LES. Grid resolution has a significant impact on the CHTC results and deviations are up to 88%. The performance of different wall functions is also investigated, with the enhanced wall function showing better performance compared to the non-blended law of the wall for certain regions of the facades.
BUILDING AND ENVIRONMENT
(2023)
Article
Engineering, Chemical
Maysam Saidi, Ziliang Wang, John R. Grace, C. Jim Lime
CANADIAN JOURNAL OF CHEMICAL ENGINEERING
(2016)
Article
Engineering, Environmental
Ziliang Wang, Maysam Saidi, C. Jim Lim, John R. Grace, Hassan Basirat Tabrizi, Zhiwei Chen, Yonghua Li
CHEMICAL ENGINEERING JOURNAL
(2016)
Article
Engineering, Chemical
Maysam Saidi, Hassan Basirat Tabrizi, Goodarz Ahmadi, John R. Grace, C. Jim Lim
Article
Engineering, Chemical
Maysam Saidi, Hassan Basirat Tabrizi
Review
Engineering, Chemical
Maysam Saidi, Hassan Basirat Tabrizi, John R. Grace
ADVANCED POWDER TECHNOLOGY
(2019)
Article
Pharmacology & Pharmacy
Kaveh Ahookhosh, Maysam Saidi, Habib Aminfar, Mousa Mohammadpourfard, Hamed Hamishehkar, Shadi Yaqoubi
INTERNATIONAL JOURNAL OF PHARMACEUTICS
(2020)
Article
Pharmacology & Pharmacy
Kaveh Ahookhosh, Maysam Saidi, Mousa Mohammadpourfard, Habib Aminfar, Hamed Hamishehkar, Ali Farnoud, Otmar Schmid
Summary: Inhalation therapy is crucial for the management of respiratory diseases, and pressurized metered dose inhalers (pMDIs) are a popular drug delivery device. Computational study on flow structure inside pMDI and deposition of micron-sized particles in human airway model revealed significant impact of inhalation air flow rate and inhaler geometry on deposition patterns.
EUROPEAN JOURNAL OF PHARMACEUTICAL SCIENCES
(2021)
Article
Computer Science, Interdisciplinary Applications
Ashkan Rafiei, Maysam Saidi
Summary: The main purpose of this study is to evaluate the influences of aneurysm geometric features on the hemodynamic conditions within the left coronary arteries. The results show that the geometric features of aneurysms can affect wall shear stress and blood flow circulation, and smaller LCA dilation size reduces the risk of blood clotting.
MEDICAL & BIOLOGICAL ENGINEERING & COMPUTING
(2022)
Article
Engineering, Chemical
Hooman Abdi Chaghakaboodi, Maysam Saidi
Summary: This study analyzed the influence of different vortex finder shapes with varying hydraulic diameters on the pressure drop, flow pattern, and separation efficiency of a square cyclone separator using Computational Fluid Dynamics (CFD). The results showed that using a cylindrical vortex finder increased the pressure drop and separation efficiency. Additionally, changing the relative hydraulic diameter from 0.5 to 0.25 resulted in a ten-fold increase in pressure drop and an increase in separation efficiency from 34.2% to 83.1% under certain conditions. However, employing a square vortex finder in a cyclone separator with De/D=0.75 decreased the separation efficiency and increased the pressure drop due to dividing the inlet flow into two branches.
CHEMICAL ENGINEERING RESEARCH & DESIGN
(2023)
Article
Engineering, Chemical
Hooman Abdi Chaghakaboodi, Maysam Saidi
Summary: This study aims to determine the effect of a square cyclone body shape on the performance of a square cyclone separator. Four square cyclone separators with different relative square lengths were considered and simulation was carried out to evaluate their performance. The results showed that the pressure drop and separation efficiency decreased as the relative square length increased.
PARTICULATE SCIENCE AND TECHNOLOGY
(2023)
Proceedings Paper
Engineering, Mechanical
Alireza Moallemi, Maysam Saidi, Hassan Basirat Tabrizi
PROCEEDINGS OF THE ASME INTERNATIONAL MECHANICAL ENGINEERING CONGRESS AND EXPOSITION, 2014, VOL 7
(2015)
Article
Engineering, Multidisciplinary
Javad Rostami, Maysam Saidi
ENGINEERING RESEARCH EXPRESS
(2020)
Article
Engineering, Multidisciplinary
Javad Rostami, Maysam Saidi
ENGINEERING RESEARCH EXPRESS
(2020)
Article
Biophysics
Nathan D. Camarillo, Rafael Jimenez-Silva, Frances T. Sheehan
Summary: This article discusses the statistical dependence between multiple measurements from the same participant and provides recommendations for using these measurements when they are not independent.
JOURNAL OF BIOMECHANICS
(2024)
Article
Biophysics
J. Huet, A. -S. Boureau, A. Sarcher, C. Cornu, A. Nordez
Summary: Standard compression in freehand 3D ultrasound induces a bias in volume calculations, but minimal compression and gel pad methods have similar results. With a trained examiner and precautions, the bias can be minimized and become acceptable in clinical applications.
JOURNAL OF BIOMECHANICS
(2024)
Article
Biophysics
C. Lariviere, A. H. Eskandari, H. Mecheri, F. Ghezelbash, D. Gagnon, A. Shirazi-Adl
Summary: Recent developments in musculoskeletal modeling have focused on model customization. Personalization of the spine profile may affect estimates of spinal loading and stability. This study investigates the biomechanical consequences of changes in the spinal profile and finds that personalizing the spine profile has medium to large effects on trunk muscle forces and negligible to small effects on spinal loading and stability.
JOURNAL OF BIOMECHANICS
(2024)
Article
Biophysics
Luke T. Mattar, Arash B. Mahboobin, Adam J. Popchak, William J. Anderst, Volker Musahl, James J. Irrgang, Richard E. Debski
Summary: Exercise therapy fails in about 25.0% of cases for individuals with rotator cuff tears, and one reason for this failure may be the inability to strengthen and balance the muscle forces that keep the humeral head in the correct position. This study developed computational musculoskeletal models to compare the net muscle force before and after exercise therapy between successfully and unsuccessfully treated patients. The study found that unsuccessfully treated patients had less inferiorly oriented net muscle forces, which may increase the risk of impingement.
JOURNAL OF BIOMECHANICS
(2024)
Article
Biophysics
Natsuki Sado, Takeshi Edagawa, Toshihide Fujimori, Shogo Hashimoto, Yoshikazu Okamoto, Takahito Nakajima
Summary: The existing methods for predicting hip and lumbosacral joint centres in Japanese adults are biased and differ between sexes. We propose new regression equations that consider soft-tissue thickness, sex differences, and a height-directional measure, and validate them using leave-one-out cross-validation.
JOURNAL OF BIOMECHANICS
(2024)
Article
Biophysics
Peimin Yu, Xuanzhen Cen, Qichang Mei, Alan Wang, Yaodong Gu, Justin Fernandez
Summary: This study aimed to explore the intra-foot biomechanical differences among individuals with chronic ankle instability (CAI), copers, and healthy individuals during dynamic tasks. The study found that copers and CAI individuals had smaller dorsiflexion angles and copers presented a more eversion position compared to healthy participants. Copers also had greater dorsiflexion angles in the metatarsophalangeal joint and more inversion moments in the subtalar joint during certain tasks. These findings can help in designing interventions to restore ankle joint functions in CAI individuals.
JOURNAL OF BIOMECHANICS
(2024)
Article
Biophysics
Jon Skovgaard Jensen, Anders Holsgaard-Larsen, Anders Stengaard Sorensen, Per Aagaard, Jens Bojsen-Moller
Summary: This study investigates the biomechanical effects of robot-assisted body weight unloading (BWU) on gait patterns in healthy young adults. The results show that dynamic robot-assisted BWU enables reduced kinetic requirements without distorting biomechanically normal gait patterns during overground walking.
JOURNAL OF BIOMECHANICS
(2024)
