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Magnussen B.F.,Computational Industry Technologies AS | Magnussen B.F.,Norwegian University of Science and Technology | Rian K.E.,Computational Industry Technologies AS | Grimsmo B.,Computational Industry Technologies AS | And 3 more authors.
Chemical Engineering Transactions | Year: 2013

The present paper demonstrates and discusses the development of a coherent technology for fire safety assessment in the oil and gas industry based on the Eddy Dissipation Concept (EDC) by Magnussen. It includes a brief review of the concept and its physical basis which is implemented together with other models into a dedicated fire simulation tool, KAMELEON FIREEX KFX. © 2013, AIDIC Servizi S.r.l. Source


Lysenko D.A.,Norwegian University of Science and Technology | Ertesvag I.S.,Norwegian University of Science and Technology | Rian K.E.,Computational Industry Technologies AS
Computers and Fluids | Year: 2013

Turbulent separated planar bluff-body flows were numerically analyzed using the state-of-the-art Open-FOAM and ANSYS FLUENT technologies, based on the conventional URANS approach. Several popular in fluid dynamics test problems such as laminar and turbulent flows over a circular cylinder and turbulent fully developed flows over a triangular cylinder in a channel were numerically replicated with the goal of validation of the selected numerical methods. The detailed, face-to-face comparison between OpenFOAM, FLUENT and experimental data was discussed. Parallel performance in the terms of a strong and weak scalability was assessed up to 1024 cores and compared as well. In general, the present results demonstrated minimum deviations between OpenFOAM and FLUENT and agreed fairly well with the experimental data and other numerical solutions. © 2012 Elsevier Ltd. Source


Lysenko D.A.,Norwegian University of Science and Technology | Ertesvag I.S.,Norwegian University of Science and Technology | Rian K.E.,Computational Industry Technologies AS
International Journal of Aeroacoustics | Year: 2014

The low-Mach number flow-induced noise by the flow past a circular cylinder at sub-critical regime was predicted. First, to assess the accuracy of the numerical methodology, the laminar flow over a circular cylinder at the Reynolds number Re = 140 and Mach number M = 0.2 was calculated by direct solution of the unsteady compressible Navier-Stokes equations. Second, the sound generated by a circular cylinder at the Reynolds number Re = 2.2 × 104 and Mach number M = 0.06 was simulated using a technique of large-eddy simulation. For both cases, the calculated acoustic fields showed a dipole directivity, similar to a natural vortex shedding. The impact of the Doppler effect was investigated and discussed as well. In general, the computed aerodynamic and far-field acoustic results were found to be in good agreement with available experimental measurements and analytical relationships. Source


Lysenko D.A.,Norwegian University of Science and Technology | Ertesvag I.S.,Norwegian University of Science and Technology | Rian K.E.,Computational Industry Technologies AS
Flow, Turbulence and Combustion | Year: 2012

The flow over a circular cylinder at Reynolds number 3900 and Mach number 0.2 was predicted numerically using the technique of large-eddy simulation. The computations were carried out with an O-type curvilinear grid of size of 300 × 300 × 64. The numerical simulations were performed using a second-order finitevolume method with central-difference schemes for the approximation of convective terms. A conventional Smagorinsky and a dynamic k-equation eddy viscosity subgrid scale models were applied. The integration time interval for data sampling was extended up to 150 vortex shedding periods for the purpose of obtaining a fully converged mean flow field. The present numerical results were found to be in good agreement with existing experimental data and previously obtained largeeddy simulation results. This gives an indication on the adequacy and accuracy of the selected large-eddy simulation technique implemented in the OpenFOAM toolbox. © Springer Science+Business Media B.V. 2012. Source


Lysenko D.A.,Norwegian University of Science and Technology | Ertesvag I.S.,Norwegian University of Science and Technology | Rian K.E.,Computational Industry Technologies AS
Flow, Turbulence and Combustion | Year: 2014

A turbulent piloted methane/air diffusion flame (Sandia Flame D) is calculated using both compressible Reynolds-averaged and large-eddy simulations (RAS and LES, respectively). The Eddy Dissipation Concept (EDC) is used for the turbulence-chemistry interaction, which assumes that molecular mixing and the subsequent combustion occur in the fine structures (smaller dissipative eddies, which are close to the Kolmogorov length scales). Assuming the full turbulence energy cascade, the characteristic length and velocity scales of the fine structures are evaluated using a standard k- turbulence model for RAS and a one-equation eddy-viscosity sub-grid scale model for LES. Finite-rate chemical kinetics are taken into account by treating the fine structures as constant pressure and adiabatic homogeneous reactors (calculated as a system of ordinary-differential equations (ODEs)) described by a Perfectly Stirred Reactor (PSR) concept. A robust implicit Runge-Kutta method (RADAU5) is used for integrating stiff ODEs to evaluate reaction rates. The radiation heat transfer is treated by the P1-approximation. The assumed β-PDF approach is applied to assess the influence of modeling of the turbulence-chemistry interaction. Numerical results are compared with available experimental data. In general, there is good agreement between present simulations and measurements both for RAS and LES, which gives a good indication on the adequacy and accuracy of the method and its further application for turbulent combustion simulations. © 2014 Springer Science+Business Media Dordrecht. Source

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