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Journal articles on the topic 'RANS simulation'

Author: Grafiati

Published: 31 May 2025

Last updated: 31 July 2025

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1

Fagbade, Adeyemi, and Stefan Heinz. "Continuous Eddy Simulation (CES) of Transonic Shock-Induced Flow Separation." Applied Sciences 14, no. 7 (2024): 2705. http://dx.doi.org/10.3390/app14072705.

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Reynolds-averaged Navier–Stokes (RANS), large eddy simulation (LES), and hybrid RANS-LES, first of all wall-modeled LES (WMLES) and detached eddy simulation (DES) methods, are regularly applied for wall-bounded turbulent flow simulations. Their characteristic advantages and disadvantages are well known: significant challenges arise from simulation performance, computational cost, and functionality issues. This paper describes the application of a new simulation approach: continuous eddy simulation (CES). CES is based on exact mathematics, and it is a minimal error method. Its functionality is

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2

Kim, Changhee, and Changmin Son. "Comparative Study on Steady and Unsteady Flow in a Centrifugal Compressor Stage." International Journal of Aerospace Engineering 2019 (June 9, 2019): 1–12. http://dx.doi.org/10.1155/2019/9457249.

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Steady Reynolds-averaged Navier-Stokes (RANS) simulation with the mixing-plane approach is the most common procedure to obtain the performance of a centrifugal compressor in an industrial development process. However, the accurate prediction of complicated flow fields in centrifugal compressors is the most significant challenge. Some phenomena such as the impeller-diffuser flow interaction generates the unsteadiness which can affect the steady assumption. The goal of this study is to investigate the differences between the RANS and URANS simulation results in a centrifugal compressor stage. Si

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Zhang, Shu Jia, Yue Ping Tong, and Le Hu. "Examine Applicability of the RANS and LES Method on Numerical Simulation of Centrifugal Pump." Applied Mechanics and Materials 55-57 (May 2011): 582–86. http://dx.doi.org/10.4028/www.scientific.net/amm.55-57.582.

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In order to examine applicability of the Reynolds-Averaged Navier-Stokes （RANS）using Reynolds Stress equation Model (RSM) and the Large Eddy Simulation (LES) in numerical simulation of centrifugal pump, a series of 3D numerical simulation at the design point and at six off-design points were carried out with the two methods. The object is based on IS80-65-160 centrifugal pump. According to the results obtained, head, shaft power, efficiency of pump were calculated, the simulated performance curves of a centrifugal pump is processed. The simulated performance curves of a centrifugal pump were c

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Mejia, Omar, Jhon Quiñones, and Santiago Laín. "RANS and Hybrid RANS-LES Simulations of an H-Type Darrieus Vertical Axis Water Turbine." Energies 11, no. 9 (2018): 2348. http://dx.doi.org/10.3390/en11092348.

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Nowadays, the global energy crisis has encouraged the use of alternative sources like the energy available in the water currents of seas and rivers. The vertical axis water turbine (VAWT) is an interesting option to harness this energy due to its advantages of facile installation, maintenance and operation. However, it is known that its efficiency is lower than that of other types of turbines due to the unsteady effects present in its flow physics. This work aims to analyse through Computational Fluid Dynamics (CFD) the turbulent flow dynamics around a small scale VAWT confined in a hydrodynam

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Jin, Jianhai, Yuhuang Ye, Xiaohe Li, Liang Li, Min Shan, and Jun Sun. "A Mapping Model of Propeller RANS and LES Flow Fields Based on Deep Learning Methods." Applied Sciences 13, no. 21 (2023): 11716. http://dx.doi.org/10.3390/app132111716.

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In this work, we propose a deep-learning-based mapping model for simulating and predicting the flow field of Reynolds-averaged Navier–Stokes (RANS) and large eddy simulation (LES) of propellers. The model employs image processing and computer vision methods to process the two-dimensional propeller RANS and LES simulation data. First, images are obtained by simulating the flow fields with the location data used to acquire a set of features specific to the corresponding positions. Second, the regression models for the flow fields and the mapping between the two different flow fields are establis

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Heinz, Stefan. "The Potential of Machine Learning Methods for Separated Turbulent Flow Simulations: Classical Versus Dynamic Methods." Fluids 9, no. 12 (2024): 278. http://dx.doi.org/10.3390/fluids9120278.

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Feasible and reliable predictions of separated turbulent flows are a requirement to successfully address the majority of aerospace and wind energy problems. Existing computational approaches such as large eddy simulation (LES) or Reynolds-averaged Navier–Stokes (RANS) methods have suffered for decades from well-known computational cost and reliability issues in this regard. One very popular approach to dealing with these questions is the use of machine learning (ML) methods to enable improved RANS predictions. An alternative is the use of minimal error simulation methods (continuous eddy simul

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Bounouar, Mokhtari, and Guessab Ahmed. "A Comparative Study between FGM and SLF Approach for Turbulent Piloted Flame of Methane." WSEAS TRANSACTIONS ON FLUID MECHANICS 18 (December 31, 2023): 272–82. http://dx.doi.org/10.37394/232013.2023.18.26.

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This study validates the RANS simulation results by comparing them with experimental data. Numerical simulations were performed for a piloted methane-air jet flame in an axisymmetric burner. It is noteworthy that RANS simulations have been performed using a Non-premixed model with Steady Laminar Flamelet (SLF) and a partially premixed model with Flamelet Generated Manifold (FGM) of the Ansys-Fluent solver are used to express the chemistry-turbulence interaction, to provide an initial solution to the simulation performed by the Pdf transported, joint two kinetic mechanisms for oxidation of meth

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Nouri, N. M., S. M. H. Mirsaeedi, and M. Moghimi. "Large eddy simulation of natural cavitating flows in Venturi-type sections." Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 225, no. 2 (2010): 369–81. http://dx.doi.org/10.1243/09544062jmes2036.

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Large eddy simulation (LES) is used here to model the cavitating flow at a Venturi-type section. Cavitating flows can occur in a wide range of applications. The flow is represented here by means of LES, which compared to Reynolds-averaged Navier—Stokes (RANS) has the advantage that in it the large, energy-containing structures are resolved directly, whereas most of these structures are modelled in RANS. This gives LES an improved fidelity over RANS, although, due to the time averaging, the required computational time is considerably lower for RANS than for LES. The conclusion of this work show

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Renzsch, Hannes, and Britton Ward. "A RANS-BEM Method to Efficiently Include Appendage Effects in RANS-Based Hull Shape Evaluation." Journal of Sailing Technology 6, no. 01 (2021): 44–57. http://dx.doi.org/10.5957/jst/2021.6.3.1.

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Abstract. In this paper an approach to mimic the influence of appendages on the pressure distribution on a boat’s hull in RANS simulations is given. While, of course, the appendages could be modelled explicitly in the RANS simulation, this significantly increases the cell count and CPU-time requirements of the simulations, particularly for boats with multiple appendages. In this approach it is assumed that the pressure fields generated by the appendages can be decomposed into two parts: one related to lift (asymmetric) and one related to the displaced volume (symmetric). For these parts actuat

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Zhong, Wei, Hongwei Tang, Tongguang Wang, and Chengyong Zhu. "Accurate RANS Simulation of Wind Turbine Stall by Turbulence Coefficient Calibration." Applied Sciences 8, no. 9 (2018): 1444. http://dx.doi.org/10.3390/app8091444.

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Stall, a complex phenomenon related to flow separation, is difficult to be predicted accurately. The motivation of the present study is to propose an approach to improve the simulation accuracy of Reynolds Averaged Navier–Stokes equations (RANS) for wind turbines in stall. The approach is implemented in three steps in simulations of the S809 airfoil and the NREL (National Renewable Energy Laboratory) Phase VI rotor. The similarity between airfoil and rotor simulations is firstly investigated. It is found that the primary reason for the inaccuracy of rotor simulation is not the rotational effec

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Meana-Fernández, Andrés, Jesús Fernández Oro, Katia Argüelles Díaz, and Sandra Velarde-Suárez. "Turbulence-Model Comparison for Aerodynamic-Performance Prediction of a Typical Vertical-Axis Wind-Turbine Airfoil." Energies 12, no. 3 (2019): 488. http://dx.doi.org/10.3390/en12030488.

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In this work, different turbulence models were applied to predict the performance of a DU-06-W-200 airfoil, a typical choice for vertical-axis wind turbines (VAWT). A compromise between simulation time and results was sought, focusing on the prediction of aerodynamic forces and the developed flow field. Reynolds-averaged Navier–Stokes equation (U-RANS) models and Scale-Resolving Simulations (SRS), such as Scale-Adaptive Simulation (SAS) and Detached Eddy Simulation (DES), were tested, with k − ω -based turbulence models providing the most accurate predictions of aerodynamic forces. A deeper st

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Heinz, Stefan, Joachim Peinke, and Bernhard Stoevesandt. "Cutting-Edge Turbulence Simulation Methods for Wind Energy and Aerospace Problems." Fluids 6, no. 8 (2021): 288. http://dx.doi.org/10.3390/fluids6080288.

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The availability of reliable and efficient turbulent flow simulation methods is highly beneficial for wind energy and aerospace developments. However, existing simulation methods suffer from significant shortcomings. In particular, the most promising methods (hybrid RANS-LES methods) face divergent developments over decades, there is a significant waste of resources and opportunities. It is very likely that this development will continue as long as there is little awareness of conceptional differences of hybrid methods and their implications. The main purpose of this paper is to contribute to

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Carrizales, Martin A., Gaétan Dussart, Vilius Portapas, Alessandro Pontillo, and Mudassir Lone. "Verification of a low fidelity fast simulation framework through RANS simulations." CEAS Aeronautical Journal 11, no. 1 (2019): 161–76. http://dx.doi.org/10.1007/s13272-019-00409-x.

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14

Schwarze, R. "Unsteady RANS simulation of oscillating mould flows." International Journal for Numerical Methods in Fluids 52, no. 8 (2006): 883–902. http://dx.doi.org/10.1002/fld.1208.

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15

Kitamura, Masashi, Byungjin An, and Motohiko Nohmi. "Noise prediction of a box fan by RANS simulation." Journal of Physics: Conference Series 2217, no. 1 (2022): 012036. http://dx.doi.org/10.1088/1742-6596/2217/1/012036.

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Abstract The characteristics of aerodynamic performance and aerodynamic noise of a box fan were evaluated to investigate the industrial applicability of computational fluid dynamics (CFD) with Reynolds averaged numerical simulation (RANS) model for fan design. In the case of unsteady RANS, the characteristic of the static pressure rise for flow rates was in good agreement with the experimental results. Aerodynamic noise performance at the design flow rate and low flow rate is well predicted using acoustic/viscous splitting technique based on unsteady RANS with multiple reference frame (MRF). A

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Eastwood, Simon J., Paul G. Tucker, Hao Xia, and Christian Klostermeier. "Developing large eddy simulation for turbomachinery applications." Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences 367, no. 1899 (2009): 2999–3013. http://dx.doi.org/10.1098/rsta.2008.0281.

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For jets, large eddy resolving simulations are compared for a range of numerical schemes with no subgrid scale (SGS) model and for a range of SGS models with the same scheme. There is little variation in results for the different SGS models, and it is shown that, for schemes which tend towards having dissipative elements, the SGS model can be abandoned, giving what can be termed numerical large eddy simulation (NLES). More complex geometries are investigated, including coaxial and chevron nozzle jets. A near-wall Reynolds-averaged Navier–Stokes (RANS) model is used to cover over streak-like st

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Ashworth, R. M. "Prediction of acoustic resonance phenomena for weapon bays using detached eddy simulation." Aeronautical Journal 109, no. 1102 (2005): 631–38. http://dx.doi.org/10.1017/s0001924000000968.

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AbstractIt is argued that acoustic resonance phenomena in open cavities such as weapons bays cannot be adequately predicted through numerical solution of Reynolds averaged Navier-Stokes (RANS) equations. The requirement to resolve the growth of the shear layer instability from the lip of the cavity inevitably implies that turbulence further downstream is resolved while also being modelled thus making RANS over dissipative. Large eddy simulation (LES) models only unresolved scales and a hybrid method combining RANS near walls with LES in the cavity appears a practical alternative to pure RANS.

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18

Hami, Khelifa. "Turbulence Modeling a Review for Different Used Methods." International Journal of Heat and Technology 39, no. 1 (2021): 227–34. http://dx.doi.org/10.18280/ijht.390125.

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This contribution represents a critical view of the advantages and limits of the set of mathematical models of the physical phenomena of turbulence. Turbulence models can be grouped into two categories, depending on how turbulent quantities are calculated: direct numerical simulations (DNS) and RANS (Reynolds Averaged Navier-Stokes Equations) models. The disadvantage of these models is that they require enormous computing power, inaccessible, especially for large and complicated geometries. For this reason, hybrid models (combinations between DNS and RANS methods) have been developed, for exam

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Hanjalić, K., and S. Kenjereš. "RANS-Based Very Large Eddy Simulation of Thermal and Magnetic Convection at Extreme Conditions." Journal of Applied Mechanics 73, no. 3 (2005): 430–40. http://dx.doi.org/10.1115/1.2150499.

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For thermal and magnetic convection at very high Rayleigh and Hartman numbers, which are inaccessible to the conventional large eddy simulation, we propose a time-dependent Reynolds-average-Navier-Stokes (T-RANS) approach in which the large-scale deterministic motion is fully resolved by time and space solution, whereas the unresolved stochastic motion is modeled by a “subscale” model for which an one-point RANS closure is used. The resolved and modeled contributions to the turbulence moments are of the same order of magnitude and in the near-wall regions the modeled heat transport becomes dom

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20

Arafat, Mohammad, Izuan Amin Ishak, Muhammad Aidil Safwan Abdul Aziz, et al. "A Hybrid RANS/LES Model for Predicting the Aerodynamics of Small City Vehicles." Journal of Advanced Research in Experimental Fluid Mechanics and Heat Transfer 17, no. 1 (2024): 1–13. http://dx.doi.org/10.37934/arefmht.17.1.113.

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Electric city vehicles are vital for reducing pollution in urban areas due to their zero emissions and high energy efficiency, significantly improving air quality and reducing the carbon footprint. This study investigates the aerodynamic behavior of simplified city vehicle models using computational fluid dynamics (CFD) simulations based on Reynolds-Averaged Navier-Stokes (RANS) and Detached Eddy Simulation (DES) turbulence model. The models are tested at speeds of 10 m/s, 15 m/s, and 20 m/s, with a grid independence study to ensure reliable results. ANSYS Fluent is used for the simulations, c

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Cremades Rey, Luis F., Denis F. Hinz, and Mahdi Abkar. "Reynolds Stress Perturbation for Epistemic Uncertainty Quantification of RANS Models Implemented in OpenFOAM." Fluids 4, no. 2 (2019): 113. http://dx.doi.org/10.3390/fluids4020113.

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Reynolds-averaged Navier-Stokes (RANS) models are widely used for the simulation of engineering problems. The turbulent-viscosity hypothesis is a central assumption to achieve closures in this class of models. This assumption introduces structural or so-called epistemic uncertainty. Estimating that epistemic uncertainty is a promising approach towards improving the reliability of RANS simulations. In this study, we adopt a methodology to estimate the epistemic uncertainty by perturbing the Reynolds stress tensor. We focus on the perturbation of the turbulent kinetic energy and the eigenvalues

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Tucker, Paul G., and Sylvain Lardeau. "Applied large eddy simulation." Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences 367, no. 1899 (2009): 2809–18. http://dx.doi.org/10.1098/rsta.2009.0065.

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Large eddy simulation (LES) is now seen more and more as a viable alternative to current industrial practice, usually based on problem-specific Reynolds-averaged Navier–Stokes (RANS) methods. Access to detailed flow physics is attractive to industry, especially in an environment in which computer modelling is bound to play an ever increasing role. However, the improvement in accuracy and flow detail has substantial cost. This has so far prevented wider industrial use of LES. The purpose of the applied LES discussion meeting was to address questions regarding what is achievable and what is not,

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Baranova, T. A., Yu V. Zhukova, A. D. Chorny, A. N. Skrypnik, R. A. Aksyanov, and I. A. Popov. "Non-isothermal vortex flow in the T-junction channel." Journal of Physics: Conference Series 2088, no. 1 (2021): 012034. http://dx.doi.org/10.1088/1742-6596/2088/1/012034.

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Abstract In this work we present the numerical simulation of coolant mixing modes in the T-junction. We shows that the RANS approach is beneficial for a qualitative flow analysis to obtain relatively agreed averaged velocity and temperature. Moreover, traditionally, the RANS approach calculates only the averaged temperature distribution. It should also be emphasized that unlike the LES approach, the steady RANS approach cannot express a local flow structure in intense mixing zones. Nevertheless, apparently the used RANS approach should be used for assessing the quality of computational grids,

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Viti, Nicolò, Daniel Valero, and Carlo Gualtieri. "Numerical Simulation of Hydraulic Jumps. Part 2: Recent Results and Future Outlook." Water 11, no. 1 (2018): 28. http://dx.doi.org/10.3390/w11010028.

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During the past two decades, hydraulic jumps have been investigated using Computational Fluid Dynamics (CFD). The second part of this two-part study is devoted to the state-of-the-art of the numerical simulation of the hydraulic jump. First, the most widely-used CFD approaches, namely the Reynolds-Averaged Navier–Stokes (RANS), the Large Eddy Simulation (LES), the Direct Numerical Simulation (DNS), the hybrid RANS-LES method Detached Eddy Simulation (DES), as well as the Smoothed Particle Hydrodynamics (SPH), are introduced pointing out their main characteristics also in the context of the bes

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Gao, Guo Hua, Jing Zhao, Fei Ma, and Wei Dong Luo. "Hybrid RANS–LES Modeling for Unsteady Cavitating Flow Simulation." Applied Mechanics and Materials 152-154 (January 2012): 1187–90. http://dx.doi.org/10.4028/www.scientific.net/amm.152-154.1187.

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A typical hybrid RANS-LES approach, DES (Detached Eddy Simulation), was introduced into cavitating flow simulation in this paper. The applicability of two DES models, including one equation DES model and SST k-ω DES model, and standard k-ε model was analyzed through experimental data of a water tunnel experiment. Validation results illustrate that the precision of DES method depends on the RANS model used and the length scale used to distinguish LES zone and RANS zone. The SST k-ω DES method can well predict cavitating flow. The averaged results gained through this model are better than those

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Zhang, Lu, Yongfei Mou, Fan Liu, Shuai Ma, and Xingda Cui. "Grid density effect for numerical simulation of civil aircraft in post stall." Journal of Physics: Conference Series 2599, no. 1 (2023): 012002. http://dx.doi.org/10.1088/1742-6596/2599/1/012002.

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Abstract Stall will deteriorate flight safety and cause serious accidents for civil aircraft. RANS-LES hybrid approaches have become a compromise choice due to insufficient ability of RANS for large flow separation. In present work, Zonal Detached-eddy-simulation coupled with high-order spatial scheme were employed to investigated grid density effect in the numerical simulations. The calculations show that the grid density would affect the numerical simulation of the small-scale flow structure in the wake of region of the main wing, and further affect the disturbance of main wing to the horizo

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Zhang, Shuai, and Adrian Wing-Keung Law. "Performance of Reynolds Averaged Navier–Stokes and Large Eddy Simulation Models in Simulating Flows in a Crossflow Ultraviolet Reactor: An Experimental Evaluation." Water 16, no. 2 (2024): 271. http://dx.doi.org/10.3390/w16020271.

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Computational Fluid Dynamics (CFD) has been increasingly adopted as a design tool for the simulation of UV disinfection efficiency and the optimization of the configuration of a UV reactor. However, the performance of CFD with different turbulence closures may vary significantly. In the present study, an experimental evaluation was performed to assess the performance of CFD with five Reynolds Averaged Navier–Stokes (RANS) turbulence closures and three Large Eddy Simulation (LES) sub-grid scale (SGS) models. A simplified crossflow reactor with a single lamp sleeve was fabricated for the experim

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Vita, Giulio, Simone Salvadori, Daniela Anna Misul, and Hassan Hemida. "Effects of Inflow Condition on RANS and LES Predictions of the Flow around a High-Rise Building." Fluids 5, no. 4 (2020): 233. http://dx.doi.org/10.3390/fluids5040233.

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An increasing number of engineering applications require accurate predictions of the flow around buildings to guarantee performance and safety. This paper investigates the effects of variations in the turbulent inflow, as predicted in different numerical simulations, on the flow pattern prediction around buildings, compared to wind tunnel tests. Turbulence characteristics were assessed at several locations around a model square high-rise building, namely, above the roof region, at the pedestrian level, and in the wake. Both Reynolds-averaged Navier–Stokes (RANS, where turbulence is fully model

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Zhong, Wenzhou, Tong Zhang, and Tetsuro Tamura. "CFD Simulation of Convective Heat Transfer on Vernacular Sustainable Architecture: Validation and Application of Methodology." Sustainability 11, no. 15 (2019): 4231. http://dx.doi.org/10.3390/su11154231.

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The global background of energy shortages and climate deterioration demands bioclimatic sustainable buildings. Vernacular architecture can provide a useful resource of passive strategies and techniques for creating inner comfort conditions with minimum heating, ventilation, and air conditioning (HVAC) assistance. The identification and verification of such knowledge are essential for climate responsive or energy passive building design. Among the methods, computational fluid dynamics (CFD) is a useful tool for simulating convective heat transfer of vernacular architecture and predicting the co

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Weymouth, Gabriel David, Robert Vance Wilson, and Frederick Stern. "RANS Computational Fluid Dynamics Predictions of Pitch and Heave Ship Motions in Head Seas." Journal of Ship Research 49, no. 02 (2005): 80–97. http://dx.doi.org/10.5957/jsr.2005.49.2.80.

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This work extends the previous effort in unsteady Reynolds averaged Navier-Stokes (RANS) simulations developed by the ship hydrodynamics group of the University of Iowa Iowa Institute of Hydraulic Research to the capability to predict pitch and heave motions of ships with forward speed in regular head seas. The simulations are performed with CFDSHIP-IOWA, which is a general-purpose, multiblock, high-performance parallel computing RANS code. Numerical verification studies in space and time demonstrate convergence for nearly all variables. The modified Wigley hull form experimental data presente

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Afailal, Al Hassan, Jérémy Galpin, Anthony Velghe, and Rémi Manceau. "Development and validation of a hybrid temporal LES model in the perspective of applications to internal combustion engines." Oil & Gas Science and Technology – Revue d’IFP Energies nouvelles 74 (2019): 56. http://dx.doi.org/10.2516/ogst/2019031.

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CFD simulation tools are increasingly used nowadays to design more fuel-efficient and clean Internal Combustion Engines (ICE). Within this framework, there is a need to benefit from a turbulence model which offers the best compromise between prediction capabilities and computational cost. The Hybrid Temporal LES (HTLES) approach is here retained within the perspective of an application to ICE configurations. HTLES is a hybrid Reynolds-Averaged Navier Stokes/Large Eddy Simulation (RANS/LES) model based on a solid theoretical framework using temporal filtering. The concept is to model the near-w

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Chen, Shiyi, Zhenhua Xia, Suyang Pei, et al. "Reynolds-stress-constrained large-eddy simulation of wall-bounded turbulent flows." Journal of Fluid Mechanics 703 (June 7, 2012): 1–28. http://dx.doi.org/10.1017/jfm.2012.150.

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AbstractIn the traditional hybrid RANS/LES approaches for the simulation of wall-bounded fluid turbulence, such as detached-eddy simulation (DES), the whole flow domain is divided into an inner layer and an outer layer. Typically the Reynolds-averaged Navier–Stokes (RANS) equations are used for the inner layer, while large-eddy simulation (LES) is used for the outer layer. The transition from the inner-layer solution to the outer-layer solution is often problematic due to the lack of small-scale dynamics in the RANS region. In this paper, we propose to simulate the whole flow domain by large-e

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Morton, Scott, James Forsythe, Anthony Mitchell, and David Hajek. "Detached-Eddy Simulations and Reynolds-Averaged Navier-Stokes Simulations of Delta Wing Vortical Flowfields." Journal of Fluids Engineering 124, no. 4 (2002): 924–32. http://dx.doi.org/10.1115/1.1517570.

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An understanding of vortical structures and vortex breakdown is essential for the development of highly maneuverable vehicles and high angle of attack flight. This is primarily due to the physical limits these phenomena impose on aircraft and missiles at extreme flight conditions. Demands for more maneuverable air vehicles have pushed the limits of current CFD methods in the high Reynolds number regime. Simulation methods must be able to accurately describe the unsteady, vortical flowfields associated with fighter aircraft at Reynolds numbers more representative of full-scale vehicles. It is t

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Han, Yi, Michael Karl Stoellinger, Huaiwu Peng, Lihui Zhang, and Wei Liu. "Large eddy simulation of atmospheric boundary layer flow over complex terrain in comparison with RANS simulation and on-site measurements under neutral stability condition." Journal of Renewable and Sustainable Energy 15, no. 2 (2023): 023301. http://dx.doi.org/10.1063/5.0133585.

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Large eddy simulation (LES) of the atmospheric boundary layer (ABL) flow over complex terrain is presented with a validation using meteorological tower (met-tower) data through an improved neutral stability sampling approach. The proposed stability sampling procedure includes a condition based on the most-likely occurrence time-periods of the neutral ABL and reduces the variabilities of the conditional wind statistics calculated at the met-towers in comparison to our previous work. The ABL flow simulations are carried out over a potential wind site with a prominent hill based using the OpenFOA

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Ketong, Liu, and Tang Aiping. "Numerical Investigation for Aerodynamic Derivatives of Bridge Deck Using DES." Open Civil Engineering Journal 8, no. 1 (2014): 326–34. http://dx.doi.org/10.2174/1874149501408010326.

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Detached Eddy Simulation（DES）is quite a new approach for the treatment of turbulence, which unites the efficiency of Reynolds Averaged Navier-Stokes Simulation (RANS) and the accuracy of Large Eddy Simulation (LES) into one framework. In this paper, DES method based on Spalart-Allmaras (S-A) turbulence model is employed to simulate the incompressible viscous flow around bridge decks. In order to obtain the aerodynamic forces, the forced motion simulations of the bridge decks are implemented by self-developed codes combined with FLUENT software. After obtaining the aerodynamic forces, aerodynam

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Mahak, M., IZ Naqavi, and PG Tucker. "Cost-effective hybrid RANS-LES type method for jet turbulence and noise prediction." International Journal of Aeroacoustics 16, no. 1-2 (2017): 97–111. http://dx.doi.org/10.1177/1475472x16684702.

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Jets at higher Reynolds numbers have a high concentration of energy in small scales in the nozzle vicinity. This is challenging for large-eddy simulation, potentially placing severe demands on grid density. To circumvent this, we propose a novel procedure based on well-known Reynolds number (Re) independent of jets. We reduce the jet Re while rescaling the boundary layer properties to maintain incoming boundary layer thickness consistent with high Re jet. The simulations are carried out using hybrid large-eddy simulation type of approach which is incorporated by using near-wall turbulence mode

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Ali, Md Shahjahan, Takashi Hosoda, and Ichiro Kimura. "Unsteady RANS and LES Simulation of an Ideal Rankine Vortex Decay." Advances in Civil Engineering 2012 (2012): 1–8. http://dx.doi.org/10.1155/2012/523839.

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The 3D numerical simulation was carried out for an idealized Rankine vortex using nonlineark-εmodel (one kind of RANS model) and large eddy simulation (LES) techniques. In this 3D simulation, the vortex flow field was given to rotate with the vertical axis in a free surface rectangular domain. In order to investigate the predictability of standard (linear) and non-lineark-εmodels, the decay of a trailing vortex was simulated and compared with previous DNS data. The governing equations for mean velocities and turbulent flows were discretized with the finite volume method based on a staggered gr

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Secundov, Alexander N., Stanley F. Birch, and Paul G. Tucker. "Propulsive jets and their acoustics." Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences 365, no. 1859 (2007): 2443–67. http://dx.doi.org/10.1098/rsta.2007.2017.

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The complex flow physics challenges and asks questions regarding these challenges a wide range of jet flows found in aerospace engineering. Hence, the daunting task facing Reynolds-averaged Navier–Stokes (RANS) technology, for which the time average of the turbulent flow field is solved, is set out. Despite the clear potential of large eddy simulation (LES)-related methods and hybrid forms involving some RANS modelling, numerous current deficiencies, mostly related to the limitations of computational resources, are identified. It is concluded that currently, these limitations make LES and hybr

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Xue, Xiao, Hua-Dong Yao, and Lars Davidson. "Synthetic turbulence generator for lattice Boltzmann method at the interface between RANS and LES." Physics of Fluids 34, no. 5 (2022): 055118. http://dx.doi.org/10.1063/5.0090641.

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The paper presents a synthetic turbulence generator (STG) for the lattice Boltzmann method (LBM) at the interface of the Reynolds averaged Navier–Stokes (RANS) equations and the LBM large eddy simulation (LES). We first obtain the RANS velocity field from a finite volume solver at the interface. Then, we apply a numerical interpolation from the RANS velocity field to the LBM velocity field due to the different grid types of RANS and LBM. The STG method generates the velocity fluctuations, and the regularized LBM reconstructs the particle distribution functions at the interface. We perform a tu

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Menzies, Kevin. "Large eddy simulation applications in gas turbines." Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences 367, no. 1899 (2009): 2827–38. http://dx.doi.org/10.1098/rsta.2009.0064.

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The gas turbine presents significant challenges to any computational fluid dynamics techniques. The combination of a wide range of flow phenomena with complex geometry is difficult to model in the context of Reynolds-averaged Navier–Stokes (RANS) solvers. We review the potential for large eddy simulation (LES) in modelling the flow in the different components of the gas turbine during a practical engineering design cycle. We show that while LES has demonstrated considerable promise for reliable prediction of many flows in the engine that are difficult for RANS it is not a panacea and considera

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Fasel, Hermann F., Dominic A. von Terzi, and Richard D. Sandberg. "A Methodology for Simulating Compressible Turbulent Flows." Journal of Applied Mechanics 73, no. 3 (2005): 405–12. http://dx.doi.org/10.1115/1.2150231.

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A flow simulation Methodology (FSM) is presented for computing the time-dependent behavior of complex compressible turbulent flows. The development of FSM was initiated in close collaboration with C. Speziale (then at Boston University). The objective of FSM is to provide the proper amount of turbulence modeling for the unresolved scales while directly computing the largest scales. The strategy is implemented by using state-of-the-art turbulence models (as developed for Reynolds averaged Navier-Stokes (RANS)) and scaling of the model terms with a “contribution function.” The contribution funct

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Baranova, Tatyana A., Yulia V. Zhukova, Andrei D. Chorny, Artem Skrypnik, and Igor A. Popov. "Non-Isothermal Vortex Flow in the T-Junction Pipe." Energies 14, no. 21 (2021): 7002. http://dx.doi.org/10.3390/en14217002.

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The numerical simulation approach of heat carrier mixing regimes in the T-junction shows that the RANS approach is beneficial for a qualitative flow analysis to obtain relatively agreed averaged velocity and temperature. Moreover, traditionally, the RANS approach only predicts the averaged temperature distribution. This mathematical model did not consider the temperature fluctuation variations important for the thermal fatigue task. It should also be emphasized that unlike the LES approach, the steady RANS approach cannot express a local flow structure in intense mixing zones. Nevertheless, ap

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O'Mahoney, T. S. D., N. J. Hills, J. W. Chew, and T. Scanlon. "Large-Eddy simulation of rim seal ingestion." Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 225, no. 12 (2011): 2881–91. http://dx.doi.org/10.1177/0954406211409285.

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Unsteady flow dynamics in turbine rim seals are known to be complex and attempts accurately to predict the interaction of the mainstream flow with the secondary air system cooling flows using computational fluid dynamics (CFD) with Reynolds-averaged Navier–Stokes (RANS) turbulence models have proved difficult. In particular, published results from RANS models have over-predicted the sealing effectiveness of the rim seal, although their use in this context continues to be common. Previous studies have ascribed this discrepancy to the failure to model flow structures with a scale greater than th

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Li, Tian, Hassan Hemida, and Jiye Zhang. "Evaluation of SA-DES and SST-DES models using OpenFOAM for calculating the flow around a train subjected to crosswinds." Proceedings of the Institution of Mechanical Engineers, Part F: Journal of Rail and Rapid Transit 234, no. 10 (2019): 1346–57. http://dx.doi.org/10.1177/0954409719895652.

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Detached eddy simulation (DES) has been widely applied in crosswind stability simulations of trains in recent years. As DES is a hybrid Reynolds Averaged Navier–Stokes (RANS)/large eddy simulation approach, the choice of the RANS model associated with DES is a key factor for an accurate numerical simulation. However, the influence of the RANS model on the flow around trains was not fully investigated in previous researches. In this study, DES with the Spalart–Allmaras (SA) model (SA-DES) and shear stress transport (SST) k−ω model (SST-DES) have been investigated owing to their ability to predi

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Roy, Christopher J., Jeffrey Payne, and Mary McWherter-Payne. "RANS Simulations of a Simplified Tractor/Trailer Geometry." Journal of Fluids Engineering 128, no. 5 (2006): 1083–89. http://dx.doi.org/10.1115/1.2236133.

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Steady-state Reynolds-averaged Navier-Stokes (RANS) simulations are presented for the three-dimensional flow over a simplified tractor/trailer geometry at zero degrees yaw angle. The simulations are conducted using a multi-block, structured computational fluid dynamics (CFD) code. The turbulence closure model employed is the two-equation Menter k-ω model. The discretization error is estimated by employing two grid levels: a fine mesh of 20 million cells and a coarser mesh of 2.5 million cells. Simulation results are compared to experimental data obtained at the NASA-Ames 7×10ft wind tunnel. Qu

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Grecu, I. S., G. Dunca, D. M. Bucur, and M. J. Cervantes. "URANS numerical simulations of pulsating flows considering streamwise pressure gradient on asymmetric diffuser." IOP Conference Series: Earth and Environmental Science 1079, no. 1 (2022): 012087. http://dx.doi.org/10.1088/1755-1315/1079/1/012087.

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Abstract The paper focuses on implementing the wall model developed by Manhart, in Reynolds Averaged Navier - Stokes (RANS) turbulence models used in the field of Computational Fluid Dynamics (CFD). This wall model considers the influence of the streamwise pressure gradient in addition to the existing wall models used in the usual CFD codes. In the present work, two RANS numerical simulations are carried out using the k-ω Shear Stress Transport (SST) turbulence model on an asymmetric diffuser geometry. One numerical simulation is carried out using the implementation of the Manhart wall model i

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Wan Zulkafli, Wan Muhammad Fadhli Arif, Anas Abdul Rahman, Ayu Abdul-Rahman, et al. "Flow Analysis of Tidal Turbine Array Interaction Using LES." Journal of Engineering and Science Research 6, no. 5 (2022): 40–49. http://dx.doi.org/10.26666/rmp.jesr.2022.5.5.

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Geographical location of Malaysia is endowed with natural resources such as coal and fossil fuels. Unfortunately, these natural resources will run out shortly if the Malaysian government does not take appropriate measures to conserve them. To ensure that the area has enough energy and sources, a system of utilizing and introducing renewable energy such as solar, rainwater, wave and tidal current energy is established. Vertical axis tidal turbine (VATT) for shallow water applications is the main topic of this study where computational fluid dynamics (CFD) via Large-eddy simulation (LES) and Rey

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Joßberger, Simon, and Stefan Riedelbauch. "Scale-Resolving Hybrid RANS-LES Simulation of a Model Kaplan Turbine on a 400-Million-Element Mesh." International Journal of Turbomachinery, Propulsion and Power 8, no. 3 (2023): 26. http://dx.doi.org/10.3390/ijtpp8030026.

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Double-regulated Kaplan turbines with adjustable guide vanes and runner blades offer a high degree of flexibility and good efficiency for a wide range of operating points. However, this also leads to a complex geometry and flow guidance with, for example, vortices of different sizes and strengths. The flow in a draft tube is especially challenging to simulate mainly due to flow phenomena, like swirl, separation and strong adverse pressure gradients, and a strong dependency on the upstream flow conditions. Standard simulation approaches with RANS turbulence models, a coarse mesh and large time

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Islam, Mohammed, and Fatima Jahra. "Improving accuracy and efficiency of CFD predictions of propeller open water performance." Journal of Naval Architecture and Marine Engineering 16, no. 1 (2019): 1–20. http://dx.doi.org/10.3329/jname.v16i1.34756.

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This research proposes mesh and domain optimization strategies for a popular Computational Fluid Dynamics (CFD) technique to estimate the open water propulsive characteristics of fixed pitch propellers accurately and time-efficiently based on examining the effect of various mesh and computation domain parameters. It used a Reynolds-Averaged Navier-Stokes (RANS) solver to predict the propulsive performance of a fixed pitch propeller with varied meshing, simulation domain and setup parameters. The optimized mesh and domain size parameters were selected using Design of Experiments (DoE) methods e

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Yu, Chao, Xiangyao Xue, Kui Shi, Mingzhen Shao, and Yang Liu. "Comparative Study on CFD Turbulence Models for the Flow Field in Air Cooled Radiator." Processes 8, no. 12 (2020): 1687. http://dx.doi.org/10.3390/pr8121687.

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This paper compares the performances of three Computational Fluid Dynamics (CFD) turbulence models, Reynolds Average Navier-Stokes (RANS), Detached Eddy Simulation (DES), and Large Eddy Simulation (LES), for simulating the flow field of a wheel loader engine compartment. The distributions of pressure fields, velocity fields, and vortex structures in a hybrid-grided engine compartment model are analyzed. The result reveals that the LES and DES can capture the detachment and breakage of the trailing edge more abundantly and meticulously than RANS. Additionally, by comparing the relevant calculat

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