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Journal articles on the topic 'Reynolds Averaged Navier-Stokes (RANS)'

Author: Grafiati

Published: 4 June 2021

Last updated: 27 July 2025

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1

Güemes, Alejandro, Pablo Fajardo, and Marco Raiola. "Experimental Assessment of RANS Models for Wind Load Estimation over Solar-Panel Arrays." Applied Sciences 11, no. 6 (2021): 2496. http://dx.doi.org/10.3390/app11062496.

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This paper reports a comparison between wind-tunnel measurements and numerical simulations to assess the capabilities of Reynolds-Averaged Navier-Stokes models to estimate the wind load over solar-panel arrays. The free airstream impinging on solar-panel arrays creates a complex separated flow at large Reynolds number, which is severely challenging for the current Reynolds-Averaged Navier-Stokes models. The Reynolds-Averaged Navier-Stokes models compared in this article are k-ϵ, Shear-Stress Transport k-ω, transition and Reynolds Shear Model. Particle Image Velocimetry measurements are perform

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2

Sun, Bohua. "Revisiting the Reynolds-averaged Navier–Stokes equations." Open Physics 19, no. 1 (2021): 853–62. http://dx.doi.org/10.1515/phys-2021-0102.

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Abstract This study revisits the Reynolds-averaged Navier–Stokes (RANS) equations and finds that the existing literature is erroneous regarding the primary unknowns and the number of independent unknowns in the RANS. The literature claims that the Reynolds stress tensor has six independent unknowns, but in fact the six unknowns can be reduced to three that are functions of the three velocity fluctuation components, because the Reynolds stress tensor is simply an integration of a second-order dyadic tensor of flow velocity fluctuations rather than a general symmetric tensor. This difficult situ

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3

Chakraborty, Arnab, and HV Warrior. "Study of turbulent flow past a square cylinder using partially-averaged Navier–Stokes method in OpenFOAM." Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 234, no. 14 (2020): 2821–32. http://dx.doi.org/10.1177/0954406220910176.

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The present paper reports numerical simulation of turbulent flow over a square cylinder using a novel scale resolving computational fluid dynamics technique named Partially-Averaged Navier–Stokes (PANS), which bridges Reynolds-Averaged Navier–Stokes (RANS) with Direct Numerical Simulation (DNS) in a seamless manner. All stream-wise and wall normal mean velocity components, turbulent stresses behavior have been computed along the flow (streamwise) as well as in transverse (wall normal) direction. The measurement locations are chosen based on the previous studies so that results could be compare

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4

Girimaji, Sharath S. "Partially-Averaged Navier-Stokes Model for Turbulence: A Reynolds-Averaged Navier-Stokes to Direct Numerical Simulation Bridging Method." Journal of Applied Mechanics 73, no. 3 (2005): 413–21. http://dx.doi.org/10.1115/1.2151207.

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A turbulence bridging method purported for any filter-width or scale resolution—fully averaged to completely resolved—is developed. The method is given the name partially averaged Navier-Stokes (PANS) method. In PANS, the model filter width (extent of partial averaging) is controlled through two parameters: the unresolved-to-total ratios of kinetic energy (fk) and dissipation (fε). The PANS closure model is derived formally from the Reynolds-averaged Navier-Stokes (RANS) model equations by addressing the following question: if RANS represents the closure for fully averaged statistics, what is

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Kuchugov, Pavel Alexandrovich, and Vladimir Fedorovich Tishkin. "Partially averaged Navier-Stokes equations." Keldysh Institute Preprints, no. 45 (2023): 1–19. http://dx.doi.org/10.20948/prepr-2023-45.

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Flows containing a transition to turbulence are inherent in a wide range of phenomena and processes, such as supernova explosions, combustion of gas mixtures, flow around bodies of various shapes, etc. Numerical simulation of such flows is of significant practical interest and is a complex independent task. To solve this problem, there are several main approaches in computational fluid dynamics, which have their own area of applicability, advantages and disadvantages. Thus, direct numerical simulation (DNS) and the large eddy simulation method (LES/ILES) are optimal approaches for describing f

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Ryu, Sungmin. "A Mathematically Exact and Well-Determined System of Equations to Close Reynolds-Averaged Navier–Stokes Equations." Mathematics 11, no. 24 (2023): 4926. http://dx.doi.org/10.3390/math11244926.

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Since Sir Osborne Reynolds presented the Reynolds-averaged Navier–Stokes (RANS) equations in 1895, the construction of complete closure for RANS equations has been regarded as extremely challenging. Taking into account that the Navier–Stokes equations are not coherent for instantaneous and mean flows, a body of knowledge outside the scope of classical mechanics may be amenable to the closure problem. In this regard, the methodology of physics-to-geometry transformation, which is coherent for both flows, is applied to RANS equations to construct six additional equations. The proposed equations

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7

Netzer, Corinna, Lars Seidel, Frédéric Ravet, and Fabian Mauss. "Assessment of the validity of RANS knock prediction using the resonance theory." International Journal of Engine Research 21, no. 4 (2019): 610–21. http://dx.doi.org/10.1177/1468087419846032.

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Following the resonance theory by Bradley and co-workers, engine knock is a consequence of an auto-ignition in the developing detonation regime. Their detonation diagram was developed using direct numerical simulations and was applied in the literature to engine knock assessment using large eddy simulations. In this work, it is analyzed if the detonation diagram can be applied for post-processing and evaluation of predicted auto-ignitions in Reynolds-averaged Navier–Stokes simulations even though the Reynolds-averaged Navier–Stokes approach cannot resolve the fine structures resolved in direct

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8

Girimaji, Sharath S., Eunhwan Jeong, and Ravi Srinivasan. "Partially Averaged Navier-Stokes Method for Turbulence: Fixed Point Analysis and Comparison With Unsteady Partially Averaged Navier-Stokes." Journal of Applied Mechanics 73, no. 3 (2005): 422–29. http://dx.doi.org/10.1115/1.2173677.

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Hybrid/bridging models that combine the advantages of Reynolds averaged Navier Stokes (RANS) method and large-eddy simulations are being increasingly used for simulating turbulent flows with large-scale unsteadiness. The objective is to obtain accurate estimates of important large-scale fluctuations at a reasonable cost. In order to be effective, these bridging methods must posses the correct “energetics”: that is, the right balance between production (P) and dissipation (ε). If the model production-to-dissipation ratio (P∕ε) is inconsistent with turbulence physics at that cutoff, the computat

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9

Liu, Zhe. "On the Investigation of Flow around the Square Cylinder Based on Different LES Models." Advanced Materials Research 594-597 (November 2012): 2676–79. http://dx.doi.org/10.4028/www.scientific.net/amr.594-597.2676.

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Although the conventional Reynolds-averaged Navier–Stokes (RANS) model has been widely applied in the industrial and engineering field, it is worthwhile to study whether these models are suitable to investigate the flow filed varying with the time. With the development of turbulence models, the unsteady Reynolds-averaged Navier–Stokes (URANS) model, detached eddy simulation (DES) and large eddy simulation (LES) compensate the disadvantage of RANS model. This paper mainly presents the theory of standard LES model, LES dynamic model and wall-adapting local eddy-viscosity (WALE) LES model. And th

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Karim, M. M., M. M. Rahman, and M. A. Alim. "Computation of Axisymmetric Turbulent Viscous Flow Around Sphere." Journal of Scientific Research 1, no. 2 (2009): 209–19. http://dx.doi.org/10.3329/jsr.v1i2.1286.

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Axisymmetric turbulent viscous flow around sphere is computed using finite volume method based on Reynolds-averaged Navier-Stokes (RANS) equations.Â Two-dimensional axisymmetric flow solver has been used to analyze flow at Reynolds number of 5Ã106. Spalart-Allmaras (S-A) and shear stress transport (SST) k-Ï turbulence models are used to capture turbulent viscous flow. The numerical results in terms of the skin friction coefficient, pressure coefficient and drag coefficient for different Reynolds numbers have been shown either graphically or in the tabular form. Velocity vectors have been dis

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Che Sidik, Nor Azwadi, Siti Nurul Akmal Yusuf, Yutaka Asako, Saiful Bahri Mohamed, and Wan Mohd Arif Aziz Japa. "A Short Review on RANS Turbulence Models." CFD Letters 12, no. 11 (2020): 83–96. http://dx.doi.org/10.37934/cfdl.12.11.8396.

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Reynolds-Averaged Navier-Stokes (RANS) are such model equations and are used to simulate numerous fluid flow problem. This article focuses on the most well-known of RANS turbulence modelling and its application to industrial flows. Among all the RANS models, low Reynold number (LRN) turbulence model is more accurate that the standard turbulence model. This paper intends to provide a brief review of researches on RANS turbulence modelling for the fundamental understanding in solving fluid flow problem and identifies opportunities for future research.

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12

Priambodo, Doni, Yongky Sanjaya, Prasanti Widyasih Sarli, and Herlien Dwiarti Setio. "Numerical Modelling of Wind Flow In Street Canyon Between High-Rise Buildings with Angle of Attack Modifications." MEDIA KOMUNIKASI TEKNIK SIPIL 28, no. 2 (2023): 202–10. http://dx.doi.org/10.14710/mkts.v28i2.37220.

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In fluid dynamics analysis, one of the things to do is to perform numerical modeling validated on the resultsof experimentation. In numerical modeling of wind flow there are several forms of modeling used includingRANS, LES, DNS, etc. where the modeling has its own advantages and disadvantages. Among these models,RANS is a model that has the cheapest computer expense compared to other models so that it has the highestworkability. Therefore, rans method testing (Reynolds Averaged Navier Stokes) was conducted to determinethe capability of turbulence models in checking wind speed contours on the

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13

Wu, Jinlong, Heng Xiao, Rui Sun, and Qiqi Wang. "Reynolds-averaged Navier–Stokes equations with explicit data-driven Reynolds stress closure can be ill-conditioned." Journal of Fluid Mechanics 869 (April 29, 2019): 553–86. http://dx.doi.org/10.1017/jfm.2019.205.

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Reynolds-averaged Navier–Stokes (RANS) simulations with turbulence closure models continue to play important roles in industrial flow simulations. However, the commonly used linear eddy-viscosity models are intrinsically unable to handle flows with non-equilibrium turbulence (e.g. flows with massive separation). Reynolds stress models, on the other hand, are plagued by their lack of robustness. Recent studies in plane channel flows found that even substituting Reynolds stresses with errors below 0.5 % from direct numerical simulation databases into RANS equations leads to velocities with large

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14

Wu, Junjie, Jiahua Li, Xiang Qiu, Xilin Xie, and Yulu Liu. "Machine learning based Reynolds averaged simulation of backward-facing step flows at different Reynolds numbers." Modern Physics Letters B 35, no. 25 (2021): 2150430. http://dx.doi.org/10.1142/s0217984921504303.

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To address the closure problem of Reynolds-averaged Navier–Stokes in numerical simulations of turbulence, the method of solving Reynolds-averaged Navier–Stokes equations based on artificial neural network is introduced in this paper. We establish the nonlinear mapping relationship between the average flow field and the steady-state eddy viscosity field. The machine learning (ML) surrogate model for the shear stress transport turbulence model is constructed. The solution process of replacing the original turbulence model equations with the predicted field variables is realized by coupling the M

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Song, Xiliang, Zhongjun Yu, Chengjiang Liu, and Gong Cheng. "Calibration of RANS model constant based on data assimilation and accurate simulation of separated flow." AIP Advances 12, no. 9 (2022): 095324. http://dx.doi.org/10.1063/5.0103253.

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To improve the prediction accuracy of separated flow based on the Reynolds Averaged Navier–Stokes model, the model constants of the baseline Reynolds stress model are calibrated by the ensemble Kalman filter data assimilation method. The separated flow in a diffuser is taken as the object, and the wall pressure coefficients of the diffuser are used as the driving data. The results show that the method that recalibrates the model constants based on data assimilation is easy to implement and is an effective method. The wall pressure coefficients and the separation regions of the diffuser predict

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16

Andrea, Petrocchi, and N. Barakos George. "Buffet boundary prediction using RANS-based criteria and adjoint methods." Aerospace Science and Technology 126 (July 13, 2022): 107664. https://doi.org/10.1016/j.ast.2022.107664.

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In this work, a procedure is proposed for a fast estimate of the transonic buffet boundary on aerofoils and wings. This algorithm aims to be an alternative to unsteady computational fluid dynamics simulations that are prohibitively expensive for complex flow cases. The algorithm combines steady Reynolds-averaged Navier-Stokes simulations with an adjoint method. Reynolds-averaged Navier-Stokes simulations were used to determine the buffet onset by means of suitable criteria, while the adjoint method was used to compute the sensitivities of the buffet parameters to the flight conditions, and dra

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17

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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Warudkar, Vilas, Pramod Sharma, and Siraj Ahmed. "Evaluation of two wind flow models for wind resource assessment for a site." E3S Web of Conferences 167 (2020): 05001. http://dx.doi.org/10.1051/e3sconf/202016705001.

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There are different numerical wind flow models are existing to simulate atmosphere flows. The conventional approach has been relying on JacksonHunt linear wind flow models, computational fluid dynamics and Reynolds- averaged Navier Stokes models has been explored in research to predict wind resource for a site. The present work aims to analyze the performance of two wind flow models to predict the variation of wind speed. The two are 1) WAsP (linear JacksonHunt model) and 2) CFD/RANS models. The wind flow numerical models are compared with high-quality measurements from single meteorological m

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Borello, D., G. Delibra, K. Hanjalić, and F. Rispoli. "Large-eddy simulations of tip leakage and secondary flows in an axial compressor cascade using a near-wall turbulence model." Proceedings of the Institution of Mechanical Engineers, Part A: Journal of Power and Energy 223, no. 6 (2009): 645–55. http://dx.doi.org/10.1243/09576509jpe825.

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This paper reports on the application of unsteady Reynolds averaged Navier—Stokes (U-RANS) and hybrid large-eddy simulation (LES)/Reynolds averaged Navier—Stokes (RANS) methods to predict flows in compressor cascades using an affordable computational mesh. Both approaches use the ζ— f elliptic relaxation eddy-viscosity model, which for U-RANS prevails throughout the flow, whereas for the hybrid the U-RANS is active only in the near-wall region, coupled with the dynamic LES in the rest of the flow. In this ‘seamless’ coupling the dissipation rate in the k-equation is multiplied by a grid-detect

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20

Kinnas, Spyros A. "VIScous Vorticity Equation (VISVE) for Turbulent 2-D Flows with Variable Density and Viscosity." Journal of Marine Science and Engineering 8, no. 3 (2020): 191. http://dx.doi.org/10.3390/jmse8030191.

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The general vorticity equation for turbulent compressible 2-D flows with variable viscosity is derived, based on the Reynolds-Averaged Navier-Stokes (RANS) equations, and simplified versions of it are presented in the case of turbulent or cavitating flows around 2-D hydrofoils.

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21

Abdullah, Kamil, Osama H. Abdulguad, Akmal Nizam Mohammed, and Zaid Suleiman. "Comparison of RANS and U-RANS for Flat Plate Film Cooling." Applied Mechanics and Materials 773-774 (July 2015): 353–57. http://dx.doi.org/10.4028/www.scientific.net/amm.773-774.353.

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Film cooling has been extensively used to provide thermal protection for the external surfaces of gas turbine components. For the past 40 years, numerous number of film cooling hole designs and arrangements have been introduced. Due to broad designs and arrangements of film cooling, numerical investigation has been utilized to provide initial insight on the aerodynamics and thermal performance of the new film cooling designs or arrangements. The present work focuses on the numerical investigation of RANS and URANS analyses on a flat plate film cooling. The investigation aims to provide compari

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22

Ling, Julia, Andrew Kurzawski, and Jeremy Templeton. "Reynolds averaged turbulence modelling using deep neural networks with embedded invariance." Journal of Fluid Mechanics 807 (October 18, 2016): 155–66. http://dx.doi.org/10.1017/jfm.2016.615.

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There exists significant demand for improved Reynolds-averaged Navier–Stokes (RANS) turbulence models that are informed by and can represent a richer set of turbulence physics. This paper presents a method of using deep neural networks to learn a model for the Reynolds stress anisotropy tensor from high-fidelity simulation data. A novel neural network architecture is proposed which uses a multiplicative layer with an invariant tensor basis to embed Galilean invariance into the predicted anisotropy tensor. It is demonstrated that this neural network architecture provides improved prediction acc

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Hsiao, C. T., and G. L. Chahine. "Numerical Study of Cavitation Inception Due to Vortex/Vortex Interaction in a Ducted Propulsor." Journal of Ship Research 52, no. 02 (2008): 114–23. http://dx.doi.org/10.5957/jsr.2008.52.2.114.

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Cavitation inception in a ducted propulsor was studied numerically using Navier-Stokes computations and bubble dynamics models. Experimental observations of the propulsor model and previous numerical computations using Reynolds-averaged Navier-Stokes (RANS) codes indicated that cavitation inception occurred in the region of interaction of the leakage and trailing tip vortices. The RANS simulations failed, however, to predict correctly both the cavitation inception index value and the inception location. To improve the numerical predictions, we complemented here the RANS computations with a dir

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Sun, M. B., J. H. Liang, and Z. G. Wang. "A modified blending function for zonal hybrid Reynolds-averaged Navier—Stokes/large-eddy simulation methodology." Proceedings of the Institution of Mechanical Engineers, Part G: Journal of Aerospace Engineering 223, no. 8 (2009): 1067–81. http://dx.doi.org/10.1243/09544100jaero575.

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A modified blending function for zonal hybrid Reynolds averaged Navier—Stokes/large eddy simulation (RANS/LES) methodology was developed using an empirical analogy from Menter k—ω shear stress transport (SST) turbulent model (Menter, 1994) to predict complex turbulent flows. Tests of slot jet in supersonic flow and supersonic flow over compression—expansion ramp was conducted and prediction of separations was well improved when certain model constant was forced on the traditional blending function (Baurle et al., 2003). Analysis based on calculations of flat plate boundary layer demonstrated t

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Foures, Dimitry P. G., Nicolas Dovetta, Denis Sipp, and Peter J. Schmid. "A data-assimilation method for Reynolds-averaged Navier–Stokes-driven mean flow reconstruction." Journal of Fluid Mechanics 759 (November 4, 2014): 404–31. http://dx.doi.org/10.1017/jfm.2014.566.

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AbstractWe present a data-assimilation technique based on a variational formulation and a Lagrange multipliers approach to enforce the Navier–Stokes equations. A general operator (referred to as the measure operator) is defined in order to mathematically describe an experimental measure. The presented method is applied to the case of mean flow measurements. Such a flow can be described by the Reynolds-averaged Navier–Stokes (RANS) equations, which can be formulated as the classical Navier–Stokes equations driven by a forcing term involving the Reynolds stresses. The stress term is an unknown o

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Korpus, R. A., and J. M. Falzarano. "Prediction of Viscous Ship Roll Damping by Unsteady Navier-Stokes Techniques." Journal of Offshore Mechanics and Arctic Engineering 119, no. 2 (1997): 108–13. http://dx.doi.org/10.1115/1.2829050.

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This paper describes a numerical technique for analyzing the viscous unsteady flow around oscillating ship hulls. The technique is based on a general Reynolds-averaged Navier-Stokes (RANS) capability, and is intended to generate viscous roll moment data for the incorporation of real-flow effects into potential flow ship motions programs. The approach utilizes the finite analytic technique for discretizing the unsteady RANS equations, and a variety of advanced turbulence models for closure. The calculations presented herein focus on viscous and vortical effects without free-surface, and utilize

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Reliquet, Gabriel, Marie Robert, Lionel Gentaz, and Pierre Ferrant. "Simulations de l'interaction entre le catamaran Delft 372 et la houle à l'aide du couplage SWENSE-Level Set." La Houille Blanche, no. 5-6 (December 2019): 59–66. http://dx.doi.org/10.1051/lhb/2019030.

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Ce papier présente les derniers développements concernant le couplage de la méthode SWENSE (Spectral Waves Navier-Stokes Equations) et d'une méthode de résolution des équations RANS (Reynolds Averaged Navier-Stokes) avec capture d'interface de type Level Set. Ce couplage permet de combiner les avantages des deux méthodes, c'est-à-dire avoir une cinématique de houle de bonne qualité dans tout le domaine grâce à la méthode SWENSE et la prise en compte du déferlement via la fonction Level Set. Le catamaran Delft 372 est utilisé pour les validations avec des calculs sur mer calme et sur houle régu

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Kranenborg, Joost, Geert Campmans, Niels Jacobsen, et al. "RANS MODELLING OF CROSS-SHORE SEDIMENT TRANSPORT AND MORPHODYNAMICS IN THE SWASH-ZONE." Coastal Engineering Proceedings, no. 36v (December 28, 2020): 14. http://dx.doi.org/10.9753/icce.v36v.sediment.14.

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Most numerical studies of sediment transport in the swash zone use depth-averaged models. However, such models still have difficulty predicting transport rates and morphodynamics. Depth-resolving models could give detailed insight in swash processes but have mostly been limited to hydrodynamic predictions. We present a depth-resolving numerical model, based on the Reynolds Averaged Navier-Stokes (RANS) equations, capable of modelling sediment transport and morphodynamics in the swash zone.Recorded Presentation from the vICCE (YouTube Link): https://youtu.be/PB8Vs0LJq88

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Zou, Qingping, Zhong Peng, and Pengzhi Lin. "EFFECTS OF WAVE BREAKING AND BEACH SLOPE ON TOE SCOUR IN FRONT OF A VERTICAL SEAWALL." Coastal Engineering Proceedings 1, no. 33 (2012): 122. http://dx.doi.org/10.9753/icce.v33.sediment.122.

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Scour in front of coastal structures is a major threat to structural stability and safety of properties behind. In this study, a Reynolds Averaged Navier-Stokes Solver (RANS) is combined with a Volume of Fluid (VOF) (RANS-VOF) surface capturing scheme to investigate the wave interactions with a Seawall and its adjacent sea bed. The main objective is to investigate the effects of wave breaking and beach slope on toe scour in front of a vertical wall.

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Pioch, Fabian, Jan Hauke Harmening, Andreas Maximilian Müller, Franz-Josef Peitzmann, Dieter Schramm, and Ould el Moctar. "Turbulence Modeling for Physics-Informed Neural Networks: Comparison of Different RANS Models for the Backward-Facing Step Flow." Fluids 8, no. 2 (2023): 43. http://dx.doi.org/10.3390/fluids8020043.

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Physics-informed neural networks (PINN) can be used to predict flow fields with a minimum of simulated or measured training data. As most technical flows are turbulent, PINNs based on the Reynolds-averaged Navier–Stokes (RANS) equations incorporating a turbulence model are needed. Several studies demonstrated the capability of PINNs to solve the Naver–Stokes equations for laminar flows. However, little work has been published concerning the application of PINNs to solve the RANS equations for turbulent flows. This study applied a RANS-based PINN approach to a backward-facing step flow at a Rey

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Tcaciuc, Gabriel-Dumitru, Ahmed Elgarayhi, Ana-Georgiana Lupu та Aristotel Popescu. "Comparison Between Prandtl’s Mixing Length Model and DNS Data for a Channel Flow Up to Re_τ ≈ 5200". Bulletin of the Polytechnic Institute of Iași. Machine constructions Section 68, № 1 (2022): 99–107. http://dx.doi.org/10.2478/bipcm-2022-0008.

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Abstract This paper presents a theoretical study of fully developed turbulent flow in a channel at friction Reynolds numbers of 1000, 2000 and 5200. For the momentum equation, Reynolds Averaged Navier-Stokes (RANS) approach was used, where the Reynolds stress was modeled using Prandtl’s mixing length model with Van Driest’s modification to capture the damping effect near wall. The velocity profile was computed by solving the non-linear ODE for momentum using Euler’s method. The results were compared with the latest available DNS data.

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Sakthivel, R., S. Vengadesan, and S. K. Bhattacharyya. "Application of non-linear k-e turbulence model in flow simulation over underwater axisymmetric hull at higher angle of attack." Journal of Naval Architecture and Marine Engineering 8, no. 2 (2011): 149–63. http://dx.doi.org/10.3329/jname.v8i2.6984.

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This paper addresses the Computational Fluid Dynamics Approach (CFD) to simulate the flow over underwater axisymmetric bodies at higher angle of attacks. Three Dimensional (3D) flow simulation is carried out over MAYA Autonomous Underwater Vehicle (AUV) at a Reynolds number (Re) of 2.09×106. These 3D flows are complex due to cross flow interaction with hull which produces nonlinearity in the flow. Cross flow interaction between pressure side and suction side is studied in the presence of angle of attack. For the present study standard k-ε model, non-linear k-ε model models of turbulence are us

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Davidson, Lars. "Hybrid LES–RANS: back scatter from a scale-similarity model used as forcing." Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences 367, no. 1899 (2009): 2905–15. http://dx.doi.org/10.1098/rsta.2008.0299.

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A dissipative scale-similarity subgrid model was recently proposed in which only the dissipative part of the subgrid stresses was added to the momentum equations. This was achieved by adding the gradient of a subgrid stress only when its sign agreed with that of the corresponding viscous term. In the present work, this idea is used the other way around as forcing in hybrid large eddy simulation–Reynolds-averaged Navier–Stokes: only the part of a subgrid stress term that corresponds to back scatter is added to the momentum equations. The forcing triggers resolved turbulence in the transition re

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Sperotto, P., S. Pieraccini, and M. A. Mendez. "A RANS approach to the meshless computation of pressure fields from Image Velocimetry." Proceedings of the International Symposium on the Application of Laser and Imaging Techniques to Fluid Mechanics 20 (July 2022): 1–10. http://dx.doi.org/10.55037/lxlaser.20th.115.

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We propose a 3D meshless method to compute mean pressure fields in turbulent flows from image velocimetry. The method is an extension of the constrained Radial Basis Function (RBF) formulation by Sperotto et al. (2022) to a Reynolds Averaged Navier Stokes (RANS) framework. This is designed to handle both scattered data as in Particle Tracking Velocimetry (PTV) and data in uniform grids as in correlation-based Particle Image Velocimetry (PIV). The RANS extension includes the Reynolds stresses into the constrained least square problem. We test the approach on a numerical database featuring a Bac

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Lindau, Jules W., Robert F. Kunz, David A. Boger, David R. Stinebring, and Howard J. Gibeling. "High Reynolds Number, Unsteady, Multiphase CFD Modeling of Cavitating Flows." Journal of Fluids Engineering 124, no. 3 (2002): 607–16. http://dx.doi.org/10.1115/1.1487360.

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A preconditioned, homogeneous, multiphase, Reynolds Averaged Navier-Stokes model with mass transfer is presented. The model is preconditioned in order to obtain good convergence and accuracy regardless of phasic density ratio or flow velocity. Engineering relevant validative unsteady two and three-dimensional results are given. A demonstrative three-dimensional, three-field (liquid, vapor, noncondensable gas) transient is also presented. In modeling axisymmetric cavitators at zero angle-of-attack with 3-D unsteady RANS, significant asymmetric flow features are obtained. In comparison with axis

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Lasher, William C., and Peter J. Richards. "Validation of Reynolds-Averaged Navier-Stokes Simulations for International America’s Cup Class Spinnaker Force Coefficients in an Atmospheric Boundary Layer." Journal of Ship Research 51, no. 01 (2007): 22–38. http://dx.doi.org/10.5957/jsr.2007.51.1.22.

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Three semirigid models for International America's Cup Class spinnakers were tested in a wind tunnel with a simulated atmospheric boundary layer. These experiments were also simulated using a commercial Reynolds-averaged Navier-Stokes (RANS) solver with three different turbulence models. A comparison between the experimental and numerical force coefficients shows very good agreement. The experimentally measured differences in the driving force coefficients among the three sails were predicted well by all three turbulence models. The realizable k-e model produced the best results, and the stand

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Kumar, K. Siva, and Sharanappa V. Sajjan. "Unsteady Flow past a Combined Pitching and Plunging Aerofoil Using an Implicit RANS Solver." Applied Mechanics and Materials 110-116 (October 2011): 3481–88. http://dx.doi.org/10.4028/www.scientific.net/amm.110-116.3481.

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Unsteady Reynolds-averaged Navier-Stokes (RANS) computations are presented for low Mach number flow past a combined pitching and plunging NACA 0012 aerofoil. The Implicit RANS solver used for obtaining time-accurate solutions is based on a finite volume nodal point spatial discretization scheme with dual time stepping. The aim is to validate the unsteady solver for flapping motion of the aerofoil. Results are presented in the form of aerodynamic coefficients and compared with available literature, thus demonstrating the capability of the solver to provide useful unsteady input data for aeroela

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Chamanara, Mehdi, Hassan Ghassemi, Manouchehr Fadavie, and Mohammad Aref Ghassemi. "Effects of the Duct Angle and Propeller Location on the Hydrodynamic Characteristics of the Ducted Propeller." Ciencia y tecnología de buques 11, no. 22 (2018): 41. http://dx.doi.org/10.25043/19098642.162.

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In the present study, the effect of the duct angle and propeller location on the hydrodynamic characteristics of the ducted propeller using Reynolds-Averaged Navier Stokes (RANS) method is reported. A Kaplan type propeller is selected with a 19A duct. The ducted propeller is analyzed by three turbulence models including the k-ε standard, k-ω SST and Reynolds stress model (RSM). The numerical results are compared with experimental data. The effects of the duct angle and the location of the propeller inside the propeller are presented and discussed.

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Rogalev, A. N., N. D. Rogalev, V. O. Kindra, S. K. Osipov, and A. S. Zonov. "Numerical study of heat transfer in rectangular channels with single pin fin and pin fin-dimple." E3S Web of Conferences 124 (2019): 01010. http://dx.doi.org/10.1051/e3sconf/201912401010.

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Evaluation of the heat transfer and hydraulic performance of a new pin fin-dimple cooling system in a rectangular channel shows its advantage. The performance are compared with the pin fin system ones with 3-D Reynolds averaged Navier-Stokes (RANS) equations. The fluid flow and heat transfer analysis for the Reynolds numbers from 8000 to 70000 involved the shear stress transport turbulence model. The new system forms a high-intensity vortex around the pin fin-dimple that increases the near-wall turbulent mixing level that intensifies the heat transfer. The calculation results indicate increase

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Yang, Guangjun, Xiaoxiao Li, Li Ding, et al. "CFD Simulation of Pollutant Emission in a Natural Draft Dry Cooling Tower with Flue Gas Injection: Comparison between LES and RANS." Energies 12, no. 19 (2019): 3630. http://dx.doi.org/10.3390/en12193630.

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Accurate prediction of pollutant dispersion is vital to the energy industry. This study investigated the Computational Fluid Dynamics (CFD) simulation of pollutant emission in a natural draft dry cooling tower (NDDCT) with flue gas injection. In order to predict the diffusion and distribution characteristics of the pollutant more accurately, Large Eddy Simulation (LES) was applied to predict the flow field and pollutant concentration field and compared with Reynolds Average Navier-Stokes (RANS) and Unsteady Reynolds Average Navier-Stokes (URANS). The relationship between pollutant concentratio

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Kumar, K. Siva, and Sharanappa V. Sajjan. "Unsteady Compressible Flow over Heaving Bodies Using an Implicit RANS Solver." Applied Mechanics and Materials 110-116 (October 2011): 4589–97. http://dx.doi.org/10.4028/www.scientific.net/amm.110-116.4589.

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Unsteady Reynolds-Averaged Navier-Stokes computations are presented for the flow over a pure plunging aerofoil and a plunging wing. The implicit RANS solver used for obtaining time-accurate solution is based on implicit finite volume nodal point spatial discretization scheme with dual time stepping. Baldwin and Lomax turbulence model has been used for the turbulence closure. The results are obtained in the form of aerodynamic coefficients, thrust coefficient and propulsion efficiency for two different cases over the aerofoil and wing and are compared with available literature.

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Chakrabarty, A., and S. N. Yakovenko. "Data-driven turbulence modelling using symbolic regression." Journal of Physics: Conference Series 2099, no. 1 (2021): 012020. http://dx.doi.org/10.1088/1742-6596/2099/1/012020.

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Abstract The study is focused on the performance of machine-learning methods applied to improve the velocity field predictions in canonical turbulent flows by the Reynolds-averaged Navier–Stokes (RANS) equation models. A key issue here is to approximate the unknown term of the Reynolds stress (RS) tensor needed to close the RANS equations. A turbulent channel flow with the curved backward-facing step on the bottom has the high-fidelity LES data set. It is chosen as the test case to examine possibilities of GEP (gene expression programming) of formulating the enhanced RANS approximations. Such

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Teles, Maria João, António Pires-Silva, and Michel Benoit. "THE INFLUENCE OF THE TURBULENCE CLOSURE MODEL ON WAVE-CURRENT INTERACTION MODELING AT A LOCAL SCALE AT A LOCAL SCALE." Coastal Engineering Proceedings 1, no. 33 (2012): 64. http://dx.doi.org/10.9753/icce.v33.waves.64.

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An advanced CFD solver based on the RANS (Reynolds Averaged Navier-Stokes) equations is used to evaluate wave-current interactions through numerical simulations of combined wave-current free surface turbulent flows. The repercussions of various schemes for modeling turbulence effects is addressed with a special attention to the exchanges and fluxes of momentum and energy between the mean flow components and the wave (oscillatory) component. Numerical simulations are compared with experimental data from Klopman (1994).

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Hu, Kenny S., and Tom I.-P. Shih. "Large-Eddy vs. Reynolds-Averaged Navier–Stokes Simulations of Flow and Heat Transfer in a U-Duct with Unsteady Flow Separation." Energies 17, no. 10 (2024): 2414. http://dx.doi.org/10.3390/en17102414.

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Large-eddy simulation (LES) and Reynolds-Averaged Navier–Stokes (RANS) equations were used to study incompressible flow and heat transfer in a U-duct with a high-aspect-ratio trapezoidal cross section. For the LES, the WALE subgrid-scale model was employed, and its inflow boundary condition was provided by a concurrent LES of incompressible fully-developed flow in a straight duct with the same cross section and flow conditions as the U-duct. LES results are presented for turbulent kinetic energy, Reynolds stresses, pressure–strain rate, turbulent diffusion, turbulent transport, and velocity–te

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Roos Launchbury, D., E. Casartelli, and L. Mangani. "Lattice Boltzmann simulation of the ERCOFTAC pump impeller." IOP Conference Series: Earth and Environmental Science 1079, no. 1 (2022): 012074. http://dx.doi.org/10.1088/1755-1315/1079/1/012074.

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Abstract The analysis of unsteady flows is becoming more and more important in the field of hydraulic turbomachinery applications, both for stable and especially for unstable operating conditions and other transient phenomena. Unsteady Reynolds-averaged Navier-Stokes (RANS) methods for incompressible flows, implemented via finite volume or finite element approaches, reach their limit in both accuracy and acceptable computational time. The accuracy mainly suffers due to the strong dependence of the solution on turbulence model variants. Furthermore, incompressibility of the flow and the linked

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Torres Zanardi, Juan M., Valentina J. Marletta, Matías A. Herrera, Ana E. Scarabino, and Federico A. Bacchi. "Validación del Modelo de Rugosidad Superficial en Simulaciones RANS de Perfiles Aerodinámicos." Resúmenes de Mecánica Computacional 1, no. 7 (2024): 69. https://doi.org/10.70567/rmc.v1i7.163.

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Enmarcado en un proyecto de investigación que busca analizar el impacto aerodinámico de la rugosidad y la erosión en las palas de aerogeneradores, este estudio tiene como objetivo evaluar las predicciones y limitaciones de las simulaciones numéricas del tipo RANS (Reynolds Average Navier-Stokes) en perfiles aerodinámicos con rugosidad superficial, comparando los resultados numéricos con resultados experimentales. Para ello, se llevan a cabo estudios numéricos del flujo turbulento sobre perfiles aerodinámicos laminares y no laminares, con rugosidad en el borde de ataque, a diferentes ángulos de

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САБЕЛЬНИКОВ, В. А., А. И. ТРОШИН, С. БАХНЭ, С. С. МОЛЕВ та В. В. ВЛАСЕНКО. "ПОИСК ОПРЕДЕЛЯЮЩИХ ФИЗИЧЕСКИХ ФАКТОРОВ В ВАЛИДАЦИОННЫХ РАСЧЕТАХ ЭКСПЕРИМЕНТАЛЬНОЙ МОДЕЛИ ONERA LAPCAT II С УЧЕТОМ ШЕРОХОВАТОСТИ СТЕНОК КАНАЛА". Gorenie i vzryv (Moskva) - Combustion and Explosion 14, № 4 (2022): 55–67. http://dx.doi.org/10.30826/ce21140406.

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Описаны результаты второго этапа численного моделирования эксперимента ONERA LAPCAT II по высокоскоростному горению водорода в модельном канале. На данном этапе расчеты проводились с учетом шероховатости стенок канала. Представлены результаты расчетов на базе подхода IDDES-SST. Показано, что влияние шероховатости стенок существенно, но не позволяет достичь хорошего согласования с экспериментальными данными. Поиск определяющих физических факторов проводился на базе RANS-расчетов (RANS - Reynolds-averaged Navier-Stokes). Проверено влияние химической кинетики, переменного турбулентного числа Пран

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Česenek, Jan. "Space-time discontinuous Galerkin method for the numerical simulation of viscous compressible gas flow with the k-omega turbulence model." EPJ Web of Conferences 180 (2018): 02016. http://dx.doi.org/10.1051/epjconf/201818002016.

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In this article we deal with the numerical simulation of the non-stationary compressible turbulent flow described by the Reynolds-Averaged Navier-Stokes (RANS) equations. This RANS system is equipped with two-equation k-omega turbulence model. The discretization of these two systems is carried out separately by the space-time discontinuous Galerkin method. This method is based on the piecewise polynomial discontinuous approximation of the sought solution in space and in time. We use the numerical experiments to demonstrate the applicability of the shown approach. All presented results were com

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Ivanov, Nikolay, Marina Zasimova, Evgueni Smirnov, and Detelin Markov. "Evaluation of mean velocity and mean speed for test ventilated room from RANS and LES CFD modeling." E3S Web of Conferences 85 (2019): 02004. http://dx.doi.org/10.1051/e3sconf/20198502004.

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The paper presents and discusses data for the ventilation airflow in an isothermal room corresponding to the Nielsen et al. (1978) test computed with Large Eddy Simulation (LES) and Reynolds-Averaged Navier-Stokes (RANS) approaches. As LES computations provide directly both the speed and velocity components data, the difference between the mean speed and mean velocity values is computed and discussed. For the RANS computations that give the mean velocity data only, application of the velocity-to-speed conversion procedure based on the turbulence kinetic energy field provided by a turbulence mo

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Sauca, Ana Camelia, Tudor Milchiș, and Ferdinánd-Zsongor Gobesz. "Wind Loading on Solar Panels." Műszaki Tudományos Közlemények 10, no. 1 (2019): 73–78. http://dx.doi.org/10.33894/mtk-2019.10.10.

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Abstract A fully 3D numerical analysis of turbulent flow over a cluster of solar photovoltaic (PV) panels was performed in order to assess the total drag and lift forces, comparing the results with the values from the guidelines of the national standard. A Reynolds-Averaged Navier–Stokes (RANS) model was used in the numerical simulations, considering two acting directions of the wind along the length of the array (0 degree – front, and 180 degrees – reverse direction).

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