• Title, Summary, Keyword: FLUENT

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A Comparison of Generative Naming Characteristics in Fluent and Non-fluent Aphasics (유창성 실어증과 비유창성 실어증 환자의 생성 이름대기 특성 연구)

  • Kim, Ae-Rie;Sim, Hyun-Sub;Kim, Young-Tae
    • Speech Sciences
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    • v.11 no.4
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    • pp.151-161
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    • 2004
  • The characteristics of generative naming ability between fluent aphasiacs and non-fluent aphasics were investigated for 10 fluent aphasics (6 Wernicke's and 4 conduction type) and 10 non-fluent aphasics (6 Broca's and 4 transcortical motor type). Subjects were given 2 types of generative naming task and asked to generate lists of words to categorical ('animal', 'things at a supermarket') and phonetic ('ㄱ', 'ㅇ', 'ㅅ') cues. The total numbers of correct and incorrect response and error type ratios were calculated. The results of the present study were as follows: (1) Fluent aphasics had higher generative naming scores than non-fluent aphasics. (2) A remarkable dissociation between performance on categorical and phonetic cue in both aphasic groups was observed. Both aphasic groups produced a large number of responses in the categorical cue. (3) There was no significant group-difference in the error type. (4) Any correlation between generative naming and confrontation naming in K - WAB was not found.

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Study on the micro-scale simulation of wind field over complex terrain by RAMS/FLUENT modeling system

  • Li, Lei;Zhang, Li-Jie;Zhang, Ning;Hu, Fei;Jiang, Yin;Xuan, Chun-Yi;Jiang, Wei-Mei
    • Wind and Structures
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    • v.13 no.6
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    • pp.519-528
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    • 2010
  • A meteorological model, RAMS, and a commercial computational fluid dynamics (CFD) model, FLUENT are combined as a one-way off-line nested modeling system, namely, RAMS/FLUENT system. The system is experimentally applied in the wind simulation over a complex terrain, with which numerical simulations of wind field over Foyeding weather station located in the northwest mountainous area of Beijing metropolis are performed. The results show that the method of combining a meteorological model and a CFD model as a modeling system is reasonable. In RAMS/FLUENT system, more realistic boundary conditions are provided for FLUENT rather than idealized vertical wind profiles, and the finite volume method (FVM) of FLUENT ensures the capability of the modeling system on describing complex terrain in the simulation. Thus, RAMS/FLUENT can provide fine-scale realistic wind data over complex terrains.

The Characteristics of Cohesion in the Narratives of Fluent Aphasics (유창성 실어증 환자의 이야기 결속표지 사용 특성)

  • Yoon, Ji-Yeon;Lee, Yoon-Kyoung
    • Speech Sciences
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    • v.12 no.4
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    • pp.237-245
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    • 2005
  • The purpose of this study was to investigate the characteristics for cohesion in the narratives of fluent aphasics. Ten fluent aphasics and ten normal adults matched chronological-age and education level with aphasics participated in this study. Story retelling task was given to the participants individually. And all narratives they produced were recorded and transcribed for analysis. The frequency of cohesive markers and the rate of accuracy were analyzed. The result were as follows; (1) The fluent aphasics used cohesive devices significantly less than the normal adult group, and the rate of accuracy of cohesive devices used was lower than the normal adults. (2) Both groups used lexical cohesion more than pro-forms and ellipsis, and the difference of two groups was larger in lexical cohesion than pro-forms and ellipsis. (3) The fluent aphasics used lexical cohesion more accurately than pro-forms and ellipsis but the normal adults used all three cohesive markers accurately. The difference of two groups was large in pro-forms and ellipsis.

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The Comparison of Flow Simulation Results around a KLNG Model Ship (KLNG선 모형 주위의 유동계산 비교)

  • Kim, Byoung-Nam;Kim, Wu-Joan;Kim, Kwang-Soo;Park, Il-Ryong
    • Journal of the Society of Naval Architects of Korea
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    • v.46 no.3
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    • pp.219-231
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    • 2009
  • Numerical simulations have been carried out for a 138K LNG Carrier (KLNG) model ship with free surface, using WAVIS 2.0 and Fluent 6.3.26 with various $y^+$ values and different grid densities. Level-set method for free surface capturing was adopted in WAVIS, while VOF has been used in Fluent. The calculated results were compared with the experiment data. Resistance coefficient, wave pattern, wave profile along the hull surface, axial velocity contours and transverse vectors had been analyzed. When the first $y^+$ value was fixed at 60, the simulation results from both WAVIS and Fluent were improved as the number of grids increased. The convergence time of WAVIS was much shorter than that of Fluent. Furthermore, WAVIS predicted the velocity field and the wave profile along the hull surface better than Fluent. However, Fluent gave better wave patterns.

FLUENT MODELLING OF CAVITATION IN POPPET VALVES (포펫트밸브내에서의 캐비테이션에 관한 FLUENT 모델링)

  • Chung-Do, Nam
    • Journal of the Korean Society of Marine Environment & Safety
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    • v.5 no.2
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    • pp.113-123
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    • 1999
  • The aim of this paper was to expand on work already carried out on the modelling of the flow through a poppet valve using CFD software FLUENT V4.22. Several different models were run on FLUENT for various lifts of the poppet cone and various back pressures. The results for pressure and velocity obtained were interpreted. The results revealed the presence of cavitation downstream of the orifice around the cone tip, and the presence of a high velocity jet stream along the centre line. These results confirm what has been found to happen in practice.

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The Comparative Analysis of Passenger Evacuation Results Using CFAST and FLUENT (CFAST 와 FLUENT 화재유동해석을 통한 승객피난 시뮬레이션 결과 비교분석)

  • Jang, Yong-Jun;Park, Won-Hee;Jung, Woo-Sung;Lee, Chang-Hyun
    • Proceedings of the KSR Conference
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    • pp.1354-1361
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    • 2007
  • The evacuation simulation study was performed with the boundary condition of a fire simulator, referring to Dae-gu Subway Fire Accident which was a real station fire. The subway station was modelled from B3F station building to B2F waiting room in fire simulation. Also, a fire simulation were performed with CFAST and FLUENT. In CFAST, the total 29 zones were divided into 18 station buildings in B3F and 11 station buildings in B2F. In FLUENT, the simulated space had the same establishment as zone of CFAST. The study focused on possibility for application of fire simulation in underground station by comparing the resulted values from two simulators. For application of fire effect, the fire data were loaded directly to EXODUS in the case of CFAST and performed a passenger evacuation simulation. In the case of FLUENT, Out Data values of a fire simulation were difficult to be compatible with EXODUS. Two resulted values of passenger evacuation simulation by fire simulation were compared with the Dae-gu Subway Fire Accident in reality.

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Experimental Study for NOx Reduction Using Reburning and Numerical Study with FLUENT (재연소를 이용한 NOx 저감의 실험적 연구 및 FLUENT를 이용한 수치적 연구)

  • Kim, Jae-Kwan;Kim, Hak-Young;Baek, Seung-Wook
    • Proceedings of the KSME Conference
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    • pp.1967-1972
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    • 2008
  • Reburning is an efficient combustion technology to reduce nitrogen oxide by injecting hydro-carbon fuel to the downstream of the main combustion. In this paper LPG has been used not only as main fuel but also as reburn fuel and air was used as an oxidizer with 15kW swirl burner. Experimental studies have been done to evaluate effect of reburning for NOx reduction. Also to examine the effect of the amount of burnout air for complete combustion by reburn fuel on NOx reduction, test was conducted by reducing the amount of burnout air. Computational fluid dynamic (CFD) simulation was performed using the commercial CFD code FLUENT 6.3 to simulate experimental results and investigate the thermo-chemical characteristics. An evaluation of reaction models for swirl burner has been carried out for propane-air with two step finite-rate eddy-dissipation model in FLUENT.

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Modelling of Oil Boom Failure using the Fluent (Fluent를 이용한 오일 붐 누유 모델링)

  • 배석한;정연철
    • Proceedings of the Korean Institute of Navigation and Port Research Conference
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    • pp.171-178
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    • 2003
  • When oil is spilled at sea, the oil boom is commonly used to tackle the movement and spreading of oil in an early stage of oil spill combat. But, the retaining capability of oil boom is affected by various factors, such as water velocity, viscosity, and density of oil, water depth, oil volume and the length of boom draft. In this study, computer modeling was peformed to investigate how these factors influence the oil retaining process. The Fluent, most popular one of many CFD(computational fluid dynamics) programs is chosen for modelling and modelling results were verified using the empirical data. It is expected that results of this study will be useful data for oil boom designer and oil spill response commander.

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The Comparative Analysis of Fire-Driven Flow Simulation for Dae-gu Subway Station Using FDS and Fluent. (FDS 및 FLUENT를 이용한 대구지하역사 화재유동 해석비교)

  • Jang, Yong-Jun;Lee, Chang-Hyun;Kim, Hag-Beom;Kim, Jin-Ho
    • Proceedings of the KSR Conference
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    • pp.50-55
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    • 2008
  • The comparative analysis of fire-driven flow simulation for Dae-Gu subway station was performed using FDS and Fluent. The boundary condition was obtained from analyzed data for Dae-Gu subway fire accident which had been outbreaked in 2003 year. The smoke flow in the second and third basement has been analyzed. The CO and temperature distribution in the train units and station platform have been obtained with FDS and FLUENT and compared with each other. Total simulation time is 600s and the results are compared of each 10sec The analyzed data will be applied to the passenger evacuation simulation for Dae-Gu subway station and used to optimal design method.

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Modelling of Oil Boom Failure using the Fluent (Fluent를 이용한 오일 붐 누유 모델링)

  • Bae, Suk-Han;Jung, Yun-Chul
    • Journal of Navigation and Port Research
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    • v.27 no.2
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    • pp.239-246
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    • 2003
  • When oil is spilled at sea, the oil boom is commonly used to tackle the movement and spreading of oil in an early stage of oil spill combat. But the retaining capability of oil boom is affected by various factors, such as water velocity, viscosity and density of oil, water depth, oil volume and the length of boom draft. In this study, a computer modelling was peformed to investigate how these factors influence the oil retaining process. The Fluent, most popular one of many CFD(computational fluid dynamics) programs is chosen for modelling and modelling results were verified using the empirical data. It is expected that results of this study will be useful data for oil boom designer and oil spill response commander.