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Journal articles on the topic 'URANS/SAS'

Author: Grafiati

Published: 1 April 2023

Last updated: 31 July 2025

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1

Yang, Xianglong, and Lei Yang. "An Elliptic Blending Turbulence Model-Based Scale-Adaptive Simulation Model Applied to Fluid Flows Separated from Curved Surfaces." Applied Sciences 12, no. 4 (2022): 2058. http://dx.doi.org/10.3390/app12042058.

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On the basis of a previously developed elliptic blending turbulence model (SST–k–ω–φ–α model), a scale-adaptive simulation (SAS) model is developed by following Menter and Egorov’s SAS concept. An SAS source term, which is related to the ratio of the modeled turbulence scale to the von Kármán length scale, is introduced into the corresponding length-scale determining equation. The major motivation of this study is that the conventional unsteady Reynolds-averaged Navier–Stokes (URANS) models provide only large-scale unsteadiness. The introduction of the SAS term allows the proposed SAS model to

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2

Kratzsch, Christoph, Amjad Asad, and Rüdiger Schwarze. "CFD of the MHD Mold Flow by Means of Hybrid LES/RANS Turbulence Modeling." Journal for Manufacturing Science and Production 15, no. 1 (2015): 49–57. http://dx.doi.org/10.1515/jmsp-2014-0046.

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AbstractIn the last decades, electromagnetic braking (EMBr) systems become a powerful tool to dampen possible jet oscillations in the continuous casting mold. Further studies showed that if a EMBr is not positioned correctly, it can induce flow oscillations. Hence, the design of these braking systems can be promoted by adequate CFD simulations. In most cases, unsteady RANS simulations (URANS) are sufficient to resolve low-frequency, large-scale oscillations of these MHD flows. Alternatively, Large Eddy Simulations (LES) may also resolve important details of the turbulence. However, since they

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3

Jiménez-Varona, José, Gabriel Liaño, José L. Castillo, and Pedro L. García-Ybarra. "Roughness Effect on the Flow Past Axisymmetric Bodies at High Incidence." Aerospace 9, no. 11 (2022): 668. http://dx.doi.org/10.3390/aerospace9110668.

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The flow at low Mach numbers and high angles of attack over axisymmetric configurations is not symmetric. The mechanism that triggers the asymmetry is a combination of a global (temporal) instability and a convective (spatial) instability. This latter instability is caused by roughness and other geometrical imperfections, which lead to roll angle dependent forces. The flow at these conditions has a complex vortex sheet structure, with two or three different flow regions. An accurate simulation by means of Computational Flow Dynamics (CFD) is thus very challenging, and many researchers have the

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4

Araya, Guillermo. "Unsteady Subsonic/Supersonic Flow Simulations in 3D Unstructured Grids over an Acoustic Cavity." Fluids 9, no. 4 (2024): 92. http://dx.doi.org/10.3390/fluids9040092.

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In this study, the unsteady Reynolds-averaged Navier–Stokes (URANS) equations are employed in conjunction with the Menter Shear Stress Transport (SST)-Scale-Adaptive Simulation (SAS) turbulence model in compressible flow, with an unstructured mesh and complex geometry. While other scale-resolving approaches in space and time, such as direct numerical simulation (DNS) and large-eddy simulation (LES), supply more comprehensive information about the turbulent energy spectrum of the fluctuating component of the flow, they imply computationally intensive situations, usually performed over structure

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5

Higgins, R. J., G. N. Barakos, and E. Jinks. "Estimation of three-dimensional aerodynamic damping using CFD." Aeronautical Journal 124, no. 1271 (2019): 24–43. http://dx.doi.org/10.1017/aer.2019.135.

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AbstractAeroelastic phenomena of stall flutter are the result of the negative aerodynamic damping associated with separated flow. From this basis, an investigation has been conducted to estimate the aerodynamic damping from a time-marching aeroelastic computation. An initial investigation is conducted on the NACA 0012 aerofoil section, before transition to 3D propellers and full aeroelastic calculations. Estimates of aerodynamic damping are presented, with a comparison made between URANS and SAS. Use of a suitable turbulence closure to allow for shedding of flow structures during stall is seen

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6

Decaix, Jean, Vlad Hasmatuchi, Maximilian Titzschkau, and Cécile Münch-Alligné. "CFD Investigation of a High Head Francis Turbine at Speed No-Load Using Advanced URANS Models." Applied Sciences 8, no. 12 (2018): 2505. http://dx.doi.org/10.3390/app8122505.

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Due to the integration of new renewable energies, the electrical grid undergoes instabilities. Hydroelectric power plants are key players for grid control thanks to pumped storage power plants. However, this objective requires extending the operating range of the machines and increasing the number of start-up, stand-by, and shut-down procedures, which reduces the lifespan of the machines. CFD based on standard URANS turbulence modeling is currently able to predict accurately the performances of the hydraulic turbines for operating points close to the Best Efficiency Point (BEP). However, far f

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7

Wang, Shibo, James R. Bell, David Burton, Astrid H. Herbst, John Sheridan, and Mark C. Thompson. "The performance of different turbulence models (URANS, SAS and DES) for predicting high-speed train slipstream." Journal of Wind Engineering and Industrial Aerodynamics 165 (June 2017): 46–57. http://dx.doi.org/10.1016/j.jweia.2017.03.001.

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8

Zhang, Jie, Faisal Gidado, Abdulmalik Adamu, Kan He, Siniša Krajnović, and Guangjun Gao. "Assessment of URANS, SAS, and IDDES on the bi-stable wake flow of a generic ship." Ocean Engineering 286 (October 2023): 115625. http://dx.doi.org/10.1016/j.oceaneng.2023.115625.

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9

Wang, Guangxue, Shengye Wang, Hao Li, Xiang Fu, and Wei Liu. "Comparative assessment of SAS, IDDES and hybrid filtering RANS/LES models based on second-moment closure." Advances in Mechanical Engineering 13, no. 6 (2021): 168781402110284. http://dx.doi.org/10.1177/16878140211028447.

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The question of which turbulence model is better for a given class of applications is always confusing for the CFD researchers and users. Comparative assessments of scale-adaptive simulation (SAS), improved delay detached-eddy simulation (IDDES) and other hybrid RANS/LES models based on eddy-viscosity models (EVMs) are thoroughly investigated. But how well they perform based on a second-moment closure needs to be answered. In this paper, a widely acclaimed Reynolds-stress model (RSM) in aeronautical engineering, SSG/LRR-[Formula: see text] model, is carried out. The relevant test cases include

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10

Münsterjohann, Sven, Jens Grabinger, Stefan Becker, and Manfred Kaltenbacher. "CAA of an Air-Cooling System for Electronic Devices." Advances in Acoustics and Vibration 2016 (October 20, 2016): 1–17. http://dx.doi.org/10.1155/2016/4785389.

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This paper presents the workflow and the results of fluid dynamics and aeroacoustic simulations for an air-cooling system as used in electronic devices. The setup represents a generic electronic device with several electronic assemblies with forced convection cooling by two axial fans. The aeroacoustic performance is computed using a hybrid method. In a first step, two unsteady CFD simulations using the Unsteady Reynolds-Averaged Navier-Stokes simulation with Shear Stress Transport (URANS-SST) turbulence model and the Scale Adaptive Simulation with Shear Stress Transport (SAS-SST) models were

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11

Shukla, S., S. N. Singh, S. S. Sinha, and R. Vijayakumar. "Comparative assessment of URANS, SAS and DES turbulence modeling in the predictions of massively separated ship airwake characteristics." Ocean Engineering 229 (June 2021): 108954. http://dx.doi.org/10.1016/j.oceaneng.2021.108954.

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12

Jiménez-Varona, José, and Gabriel Liaño. "Fineness Ratio Effects on the Flow Past an Axisymmetric Body at High Incidence." Aerospace 10, no. 5 (2023): 432. http://dx.doi.org/10.3390/aerospace10050432.

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The flow past an axisymmetric body at a sufficiently high angle of attack becomes asymmetric and unsteady. Several authors identified three different flow regions for bodies of large fineness ratio at low subsonic flow and high incidence: a steady region in the forebody and two unsteady regions in the rear body. Unsteady Reynolds Averaged Navier–Stokes (URANS) codes with eddy viscosity turbulence models or Reynolds stress turbulence models fail to capture the unsteady flow region. These methods are overly dissipative and resolve only frequencies far lower than turbulent fluctuations. Scale-Ada

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13

Maleki, Siavash, David Burton, and Mark C. Thompson. "Assessment of various turbulence models (ELES, SAS, URANS and RANS) for predicting the aerodynamics of freight train container wagons." Journal of Wind Engineering and Industrial Aerodynamics 170 (November 2017): 68–80. http://dx.doi.org/10.1016/j.jweia.2017.07.008.

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14

Hu, Ping, Tong Lin, Rui Yang, Xiaocheng Zhu, and Zhaohui Du. "Numerical investigation on flow instabilities in low-pressure steam turbine last stage under different low-load conditions." Proceedings of the Institution of Mechanical Engineers, Part A: Journal of Power and Energy 235, no. 6 (2021): 1544–62. http://dx.doi.org/10.1177/0957650921997199.

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The modern power generation system requires steam turbines operating at flexible operating points, and flow instabilities readily occur in the low-pressure (LP) last stage under low-load conditions, which may cause failure of the last stage moving blades. Some studies have shown that within this operating range, a shift of the operating point may lead to flow instabilities. Numerical simulation has gradually developed into a popular method for such researches, but it is expensive for a complex model, which has to be balanced between efficiency and accuracy. This work is divided into three part

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15

Rezaeiha, Abdolrahim, Hamid Montazeri, and Bert Blocken. "CFD analysis of dynamic stall on vertical axis wind turbines using Scale-Adaptive Simulation (SAS): Comparison against URANS and hybrid RANS/LES." Energy Conversion and Management 196 (September 2019): 1282–98. http://dx.doi.org/10.1016/j.enconman.2019.06.081.

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16

Grinderslev, Christian, Felix Houtin-Mongrolle, Niels Nørmark Sørensen, et al. "Forced-motion simulations of vortex-induced vibrations of wind turbine blades – a study of sensitivities." Wind Energy Science 8, no. 10 (2023): 1625–38. http://dx.doi.org/10.5194/wes-8-1625-2023.

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Abstract. Vortex-induced vibrations on wind turbine blades are a complex phenomenon not predictable by standard engineering models. For this reason, higher-fidelity computational fluid dynamics (CFD) methods are needed. However, the term CFD covers a broad range of fidelities, and this study investigates which choices have to be made when wanting to capture the vortex-induced vibration (VIV) phenomenon to a satisfying degree. The method studied is the so-called forced-motion (FM) approach, where the structural motion is imposed on the CFD blade surface through mode shape assumptions rather tha

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17

Fossi, Alain, Alain DeChamplain, and Benjamin Akih-Kumgeh. "Unsteady RANS and scale adaptive simulations of a turbulent spray flame in a swirled-stabilized gas turbine model combustor using tabulated chemistry." International Journal of Numerical Methods for Heat & Fluid Flow 25, no. 5 (2015): 1064–88. http://dx.doi.org/10.1108/hff-09-2014-0272.

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Purpose – The purpose of this paper is to numerically investigate the three-dimensional (3D) reacting turbulent two-phase flow field of a scaled swirl-stabilized gas turbine combustor using the commercial computational fluid dynamic (CFD) software ANSYS FLUENT. The first scope of the study aims to explicitly compare the predictive capabilities of two turbulence models namely Unsteady Reynolds Averaged Navier-Stokes and Scale Adaptive Simulation for a reasonable trade-off between accuracy of results and global computational cost when applied to simulate swirl-stabilized spray combustion. The se

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18

Shukla, Anuj Kumar, and Anupam Dewan. "Computational analysis of convective heat transfer properties of turbulent slot jet impingement." Engineering Computations ahead-of-print, ahead-of-print (2021). http://dx.doi.org/10.1108/ec-08-2020-0483.

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Purpose Convective heat transfer features of a turbulent slot jet impingement are comprehensively studied using two different computational approaches, namely, URANS (unsteady Reynolds-averaged Navier–Stokes equations) and SAS (scale-adaptive simulation). Turbulent slot jet impingement heat transfer is used where a considerable heat transfer enhancement is required, and computationally, it is a quite challenging flow configuration. Design/methodology/approach Customized OpenFOAM 4.1, an open-access computational fluid dynamics (CFD) code, is used for SAS (SST-SAS k-ω) and URANS (standard k-ε a

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19

Pallares, Jordi, Alexandre Fabregat, Akim Lavrinenko, et al. "Computational fluid dynamics challenge on indoor dispersion of pathogen-laden aerosols." Physics of Fluids 37, no. 2 (2025). https://doi.org/10.1063/5.0252665.

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This paper presents and discusses the results of the “2024 International Computational Fluid Dynamics Challenge on the long-range indoor dispersion of pathogen-laden aerosols” aimed at assessing the ability of different computational codes and turbulence models to reproduce the dispersion of particles produced by a turbulent natural convection flow enclosed in a room sized cubical cavity. A total of 12 research groups from ten different countries have conducted 15 simulations of the same flow configuration by solving the Reynolds averaged Navier–Stokes (RANS) equations, the unsteady Reynolds a

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20

Ravelli, Silvia, and Giovanna Barigozzi. "Application of Unsteady Computational Fluid Dynamics Methods to Trailing Edge Cutback Film Cooling." Journal of Turbomachinery 136, no. 12 (2014). http://dx.doi.org/10.1115/1.4028238.

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The main purpose of this numerical investigation is to overcome the limitations of the steady modeling in predicting the cooling efficiency over the cutback surface in a high pressure turbine nozzle guide vane. Since discrepancy between Reynolds-averaged Navier–Stokes (RANS) predictions and measured thermal coverage at the trailing edge was attributable to unsteadiness, Unsteady RANS (URANS) modeling was implemented to evaluate improvements in simulating the mixing between the mainstream and the coolant exiting the cutback slot. With the aim of reducing the computation effort, only a portion o

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21

Arbelo Romero, Jose Matias, Bert Blocken, Hassan Hemida, and Mark Sterling. "On the performance of SRANS, URANS and SAS in the prediction of the wind characteristics around a high-rise building." SSRN Electronic Journal, 2024. http://dx.doi.org/10.2139/ssrn.4918297.

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22

Da Soghe, Riccardo, Cosimo Bianchini, and Jacopo D'Errico. "Numerical Characterization of Flow and Heat Transfer in Preswirl Systems." Journal of Engineering for Gas Turbines and Power 140, no. 7 (2018). http://dx.doi.org/10.1115/1.4038618.

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This paper deals with a numerical study aimed at the validation of a computational procedure for the aerothermal characterization of preswirl systems employed in axial gas turbines. The numerical campaign focused on an experimental facility which models the flow field inside a direct-flow preswirl system. Steady and unsteady simulation techniques were adopted in conjunction with both a standard two-equation Reynolds-averaged Navier–Stokes (RANS)/unsteady RANS (URANS) modeling and more advanced approaches such as the scale-adaptive-simulation (SAS) principle, the stress-blended eddy simulation

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23

Abbaspour, Madjid, Navid Nemati Kourabbasloo, Pouya Mohtat, and Araz Tanha. "Numerical simulation of vortex-induced vibration of a smooth circular cylinder at the subcritical regime." Proceedings of the Institution of Mechanical Engineers, Part M: Journal of Engineering for the Maritime Environment, April 3, 2022, 147509022210884. http://dx.doi.org/10.1177/14750902221088429.

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The present paper focuses on the simulation of vortex-induced vibration (VIV) of a rigid, smooth circular cylinder with elastic supports subject to a cross-flow at the subcritical regime of Reynolds number, 30,000< Re<80,000. The circular cylinder is allowed to move in one degree-of-freedom (DOF), heave. Unsteady Reynolds-averaged Navier-Stokes (URANS) equations are solved with Menter’s k — [Formula: see text] based Shear Stress Transport based Scale-Adaptive Simulation, SAS-SST, turbulence model, and two-equation transition transport γ — θ model. The transport equations are discretized

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24

Wang, Yefang, Fan Zhang, Shouqi Yuan, Ke Chen, Xueyuan Wei, and Desmond Appiah. "Effect of URANS and Hybrid RANS-Large Eddy Simulation Turbulence Models on Unsteady Turbulent Flows Inside a Side Channel Pump." Journal of Fluids Engineering 142, no. 6 (2020). http://dx.doi.org/10.1115/1.4045995.

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Abstract In this work, the unsteady Reynolds-averaged Navier–Stokes (URANS) and three hybrid Reynolds-averaged Navier–Stokes-large eddy simulation (RANS-LES) models are employed to resolve the vortical flows in a typical single-stage side channel pump, to evaluate the suitability of these advanced turbulence models in predicting the pump hydraulic performance and unstable swirling flows. By the comparison of the overall performance, it can be observed that the results obtained by scale-adapted simulation (SAS) are closer to test data than shear stress transport (SST), detached eddy simulation

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