Investigation of the application of RANS turbulence models to the calculation of nonisothermal low-Prandtl-number flows

Козелков, А. С.; Kurkin, A. A.; Курулин, В. В.; Legchanov, M. A.; Tyatyushkina, Elena; Tsibereva, Yu. A.

doi:10.1134/s0015462815040055

Cited by 8 publications

(4 citation statements)

References 6 publications

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“…These methods and models have been implemented in the software package LOGOS. LOGOS is a 3D multi-physics code for convective heat and mass transfer, aerodynamic and hydrodynamic simulations on parallel computers [11,[13][14][15][16][17][18]. LOGOS has been successfully verified and demonstrated with sufficiently high efficiency on a number of various hydrodynamic tests, including propagation of gravity waves on a free surface (tsunami) [2,14,18] and industry-specific simulations [11,15].…”

Section: Mathematical Model and Numerical Schemementioning

confidence: 99%

Technology of 3D Simulation of High-Speed Damping Processes in the Hydraulic Brake Device

Efremov¹,

Козелков²,

Дмитриев³

et al. 2020

Computational Models in Engineering

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This chapter describes a three-dimensional simulation technology for physical processes in concentric hydraulic brakes with a throttling-groove partly filled hydraulic cylinder. The technology is based on the numerical solution of a system of Navier-Stokes equations. Free surface tracking is provided by the volume of fluid (VOF) method. Recoiling parts are simulated by means of moving transformable grids. Numerical solution of the equations is based on the finite-volume discretization on an unstructured grid. Our technology enables simulations of the whole working cycle of the hydraulic brake. Results of hydraulic brake simulations in the counter-recoil regime are reported. The results of the simulations are compared with experimental data obtained on JSC "KBP" test benches. The calculated and the experimental sets of data are compared based on the piston velocity as a function of distance. The performance of the hydraulic brake is studied as a function of the fluid mass and firing elevation of the gun.

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Section: Mathematical Model and Numerical Schemementioning

confidence: 99%

Technology of 3D Simulation of High-Speed Damping Processes in the Hydraulic Brake Device

Efremov¹,

Козелков²,

Дмитриев³

et al. 2020

Computational Models in Engineering

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“…Since the currents accompanying accidents in reactor installations are characterized by Rayleigh numbers of even higher orders, considerable interest is in the study of convection at Rayleigh numbers ∼10 17 . The experiment that covers the region most important for the safety problems of nuclear reactors is the BALI experiment.…”

Section: Modeling the Copo Experimentmentioning

confidence: 99%

“…This package is the Russian software product of engineering analysis intended for solving conjugate three-dimensional problems of convective heat and mass transfer, aerodynamics, and hydrodynamics on parallel computers. The LOGOS software package has successfully passed the verification and has shown quite good results on a series of various hydrodynamic problems [8,9,17,22,23], including calculations of turbulent and nonstationary flows [20,21] and geophysical phenomena [24][25][26]. difference are characterized by the presence of different-scale vortex structures considering the main features of naturally convective flow and are widely used in engineering applications.…”

Section: Numerical Experimentsmentioning

confidence: 99%

“…Numerical modeling of the BALI experiment for the purpose of verification and calibration of various models of turbulence was carried out in [13]. It was shown in [14] that the use AKN turbulence model (the AKN model is described in [15][16][17]) improves the prediction of the heat flux distribution. Modeling using the standard -model of turbulence shows that its application leads to an underestimated heat flux distribution.…”

Section: Introductionmentioning

confidence: 99%

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Simulation of Turbulent Convection at High Rayleigh Numbers

Dmitriev

Козелков

Kurkin

et al. 2018

Modelling and Simulation in Engineering

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The paper considers the possibility of using different approaches to modeling turbulence under conditions of highly developed convection at high Rayleigh numbers. A number of industrially oriented problems with experimental data have been chosen for the study. It is shown that, at Rayleigh numbers from 10 9 to 10 17 , the application of the eddy-resolving LES model makes it possible to substantially increase the accuracy of modeling natural convection in comparison with the linear vortex viscosity model SST. This advantage is most pronounced for cases of a vertical temperature difference with the formation of a large zone of convection of strong intensity. The use of the Reynolds stress model EARSM is shown for cases of natural convective flow in domains with dihedral angles in the simulated region and the predominance of secondary currents. When simulating a less intense convective flow, when the temperature difference is reached at one boundary, the differences in the approaches used to model turbulence are less significant. It is shown that, with increasing values of Rayleigh numbers, errors in the determination of thermohydraulic characteristics increase and, for more accurate determination of them, it is expedient to use eddy-resolving approaches to the modeling of turbulence.

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Numerical simulation of aerodynamic problems based on adaptive mesh refinement method

et al. 2020

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Numerical simulation of aerodynamic problems using an algorithm, which identifies shock regions and refines the mesh there using an adaptive mesh refinement method, is performed. The static mesh adaptation method is based on cell partitioning by adding new nodes to cell faces. The method of identification of the shock regions using a pressure and density gradient criterion and its verification are presented. The use and applications of the developed algorithm are illustrated, and supersonic and hypersonic flows with strong shock waves are calculated. The results computed explore the shock-wave structure of the flow, which develops near the nose cone section of a body and determines its aerodynamic performance. The aerodynamic performance of bodies with different nose cone designs, including a body with a spike and a pointed cone with an opposing gas jet injected from the nose section, are evaluated based on the proposed method. The method of static mesh adaptation provides a visually sharper picture of the flow around the body and reduces the numerical error of drag coefficient calculations in comparison with wind tunnel measurements. The results computed on meshes of similar resolution constructed with the adaptation method and automatic mesh generator are compared. The results computed on the adaptive mesh are similar to those computed on the mesh generated automatically, but the adaptive mesh has a smaller number of cells.

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Investigation of the application of RANS turbulence models to the calculation of nonisothermal low-Prandtl-number flows

Cited by 8 publications

References 6 publications

Technology of 3D Simulation of High-Speed Damping Processes in the Hydraulic Brake Device

Technology of 3D Simulation of High-Speed Damping Processes in the Hydraulic Brake Device

Simulation of Turbulent Convection at High Rayleigh Numbers

Numerical simulation of aerodynamic problems based on adaptive mesh refinement method

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