• 한국전산유체공학회:학술대회논문집
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• 2009.04a
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• pp.202-207
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• 2009

In this study, Numerical simulations were performed to analyze the characteristics of fire driven smoke flow for different location of fire source in the deeply underground subway station with using FDS code. The fire driven smoke-flow which was simulated by using Parallel Computational Method for fast calculation and LES for turbulence model. In this research, the fire location to obstruct a suitable egress from the fire disaster were discussed.

• Ecology and Resilient Infrastructure
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• v.4 no.1
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• pp.54-62
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• 2017

This study investigated compound open channel flow using OpenFOAM Large Eddy Simulation (LES). Large eddy simulations were carried out by solving the filtered continuity and momentum equations numerically. One equation LES and non-uniform grid were applied to capture the anisotropic turbulence and secondary flow near the wall. The results of large eddy simulations of turbulent flow in a compound open channel with deep and shallow flood plain depths are presented. These LESs are validated with experimental data, resulting in a good agreement between measured and calculated data. The role of anisotropic turbulence in generating secondary currents is illustrated.

• Transactions of the Korean Society of Mechanical Engineers B
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• v.33 no.3
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• pp.156-163
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• 2009

In this study, comparative analysis on the back-layer phenomena in the tunnel-fire driven flow is performed using numerical simulation with LES and RANS. FDS(Fire Dynamics Simulator) code is employed to calculate the fire-driven turbulent flow for LES and Smartfire code is used for RANS. Hwang and Wargo's data of scaling tunnel fire experiment are employed to compare with the present numerical simulation. The modeled tunnel is 5.4m(L) ${\times}$ 0.4m(W) ${\times}$ 0.3m(H). Heat Release Rate (HRR) of fire is 3.3kW and ventilation-velocity is 0.33m/s in the main stream. The various grid-distributions are systematically tested with FDS code to analyze the effects of grid size. The LES method with FDS provides an improved back-layer flow behavior in comparison with the RANS (${\kappa}-{\epsilon}$) method by Smartfire. The FDS solvers, however, overpredict the velocity in the center region of flow which is caused by the defects in the tunnel-entrance turbulence strength and in the near-wall turbulent flow in FDS code.

• Cartoon and Animation Studies
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• s.13
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• pp.199-210
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• 2008

Nous tentons ici d'une analyse esthetique sur le film d'animation francais "Renaissance". Le film d'animation est un genre du recit d'images. L'on no peut donc le traiter simplement comme les chaines des images sans I'histoire, ni comme I'histoire sans les images. Nous essaions de trouver dans notre etude, un meddle d'analyse sur le film d'animation. L'acces y est commece par expliquer le context du film et son resume de I'histoire. Ensuite, nous travaillons sur les caracteristiques produites par des images(noir et blanc) et des techniques(motion capture). Elles sont considerees comme les traits expressifs, ou les trails formels. Troisiement, on analysr des codes des genres et des sens implicites qui sont presentes dans le film. Apres aborder tous ces prises on comptes, nous les synthetisons dans ie principe d'esthetique. lci, celui-ci est figure comme un accord entre les caractedristiques formelless et les contenus traites. Mais le film n'arrive pas a cette concordance. L'avancee technique et le plaisir visuel que le film nous donne ne sont pourtant pas meprisable memo si I'objectif esthetique du film no s'acheve sur un echec. Notre etude est un peu large afin d'analyser les detailes du film. Nous laisssons cette faiblesss a un autre travail du futur, on etant content sur l'etude qui pout servir a analyser un film d'animation, mame un peu grossierement.

• KSCE Journal of Civil and Environmental Engineering Research
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• v.28 no.5B
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• pp.591-594
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• 2008

Present study aims at the development of a reasonable boundary condition for a structure over inclined seabed in case of the numerical model with quadrilateral mesh system. The technique for the inclined impermeable/permeable boundary in the quadrilateral mesh is newly proposed. The new technique and LES-WASS-3D model (Hur and Lee, 2007) have been used for the investigation of the dynamics of fluid field, and validated through the comparison with a typical stair-type boundary condition. 3-Dimensional numerical model with Large Eddy Simulation is called LES-WASS-3D, and is able to simulate directly interaction of WAve Structure Sea bed/Sandy beach.

• Journal of computational fluids engineering
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• v.9 no.2
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• pp.23-29
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• 2004

A numerical simulation of an incompressible cavity flow is conducted using the hybrid turbulence model. The model adopted is a modified type of DES using k- ε two-equation model. Cavity geometry and flow condition are based on Cattafesta's experiment. Computational results are compared with the results of Cattafesta's experiment. The simulation successfully predicts the oscillatory features and the Strouhal number of the oscillation compares very favorably with that of the dominant mode of experimental data. Vorticity contours obtained from the simulation data are consistent with the smoke visualization of the Cattafesta's experiment. The coherent structures of cavity flow are also investigated using Q criterion.

• Journal of Power System Engineering
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• v.4 no.3
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• pp.40-47
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• 2000

The turbulent flow with wake, reattachment and recirculation flow is very important from the viewpoint of engineering. But that is still difficult because of especially the unsteady problems which are related with the vehicle dynamics and the aerodynamics noise. This paper evaluate LES that can analyze about all fluid flow region including the laminar, transition and turbulent. So we compare the results of LES with those of PIV measurement and Reynolds averaging models. In conclusion, LES predicts flow behavior better than Reynolds averaging models.

• Journal of Ocean Engineering and Technology
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• v.22 no.4
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• pp.34-39
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• 2008

The aim of this study is to investigate the inundation characteristics over coastal area due to the variation of sea level and plane arrangement of manholes using the 3D numerical model that is able to simulate directly interaction of WAve Structure Sandy beach(LES-WASS-3D). At first, The adopted model was validated through the comparison with an existing experimental data and showed fairly nice agreement. And then, the inundation characteristics over coastal area are discussed in relation to the variation of sea level and plane arrangement of manholes.

• 한국전산유체공학회:학술대회논문집
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• 2010.05a
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• pp.508-516
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• 2010

An efficient code has been developed to predict dispersion of indoor air pollutants The computing capability of the code has been compared with that of a commercial code inn a benchmark test. After that, the code has been employed to compute dispersion of a pollutant released from a new furniture, a kind of Sick Building Syndrome (SBS). A sofa which generates formaldehyde is implemented by using an immersed boundary method. Large Eddy Simulation (LES) is employed to obtain time-dependent velocity and scalar fields. LES has bee regarded as an academic tool, but the newly-developed code reveals a possibility of application of LES to practical problems, especially dispersion of indoor pollutants.

• Journal of the Korean Society of Clothing and Textiles
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• v.3 no.1
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• pp.25-30
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• 1979

Le propos de la presente consideration est de deceler Ie probleme du costume au niveau de probleme de l'art pur qui, comme dit Hegel, repond a un besoin primitif qui consiste a exterioriser et a concretiser les representations et les idees nees dans I'esprit humain. II va de soi que c'est une sorte de problemes appartenants a la theorie generale du costume. Mais il nous semble que chez nous on a neglige d'analyser les elements du costume sous l'angle de cette exteriorisation de l'idee esthetique que nous avons essay de souligner. Nous avons pris cette fois, pour un modele de ce sujet, les costumes sous Justinien (527-565) de l'Empire byzantin.