• 제목/요약/키워드: CFD software

검색결과 305건 처리시간 0.025초

실험계획법을 이용한 시로코팬의 성능향상 (Performance Improvement of Sirocco Fan using Design of Experiments)

  • 최영석;정욱희;이경용
    • 유체기계공업학회:학술대회논문집
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    • 유체기계공업학회 2006년 제4회 한국유체공학학술대회 논문집
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    • pp.283-286
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    • 2006
  • This paper presents a numerical study on the overall performance and local flow characteristics of the sirocco fan. The effects of impeller and volute shape distribution on the performance of the sirocco fan were numerically studied using a commercial CFD code and a DOE (design of experiments) software. At present, our attention was focused on the relation of the results of DOE and the performance of the sirocco fan. As a main result of the optimization, the performance of the sirocco fan was successfully improved. Also, detailed effects of geometric parameter of impeller and volute in the sirocco fan were discussed.

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Numerical Evaluation of Dynamic Transfer Matrix and Unsteady Cavitation Characteristics of an Inducer

  • Yonezawa, Koichi;Aono, Jun;Kang, Donghyuk;Horiguchi, Hironori;Kawata, Yutaka;Tsujimoto, Yoshinobu
    • International Journal of Fluid Machinery and Systems
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    • 제5권3호
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    • pp.126-133
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    • 2012
  • The transfer matrix and unsteady cavitation characteristics, cavitation compliance and mass flow gain factor, of cavitating inducer were evaluated by CFD using commercial software. Quasi-steady values of cavitation compliance and mass flow gain factor were obtained first by using steady calculations at various flow rate and inlet cavitation number. Then unsteady calculations were made to determine the transfer matrix and the cavitation characteristics. The results are compared with experiments to show the validity of calculations.

UH-60A 로터 블레이드의 정지비행 성능해석 (PERFORMANCE ANALYSIS OF HOVERING UH-60A ROTOR BLADE)

  • 박영민;장병희;정진덕
    • 한국전산유체공학회:학술대회논문집
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    • 한국전산유체공학회 2007년도 추계 학술대회논문집
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    • pp.73-76
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    • 2007
  • The present paper describes the results of performance analysis for UH-60A rotor blade in hover. For the numerical simulations, commercial CFD software, FLUENT was used with Spalart-Allmaras turbulence model. The flow solver was based on node based scheme and second order spatial accuracy options was used for simulations. For the enhancement of wake capturing capability, high resolution grid was used around tip vortex region. Granting that somewhat over prediction of thrust was observed near blade tip region, performance was well correlated with experimental data within 3% accuracy in the operating region. Finally it was shown that the present flow solver can be used for preliminary performance analysis tool for hovering helicopter rotor blades.

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자오면 고정 형상에서 사류펌프 임펠러 및 디퓨져 날개형상 설계 (Blade Shape Design of Mixed-flow Pump Impellers and Diffusers in a Fixed Meridional Geometry)

  • 김성;최영석;이경용
    • 대한설비공학회:학술대회논문집
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    • 대한설비공학회 2009년도 하계학술발표대회 논문집
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    • pp.1203-1208
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    • 2009
  • In this paper, the flow characteristics of the mixed-flow pump impellers and diffusers were numerically predicted by commercial CFD software and DOE(design of experiments). We also discussed how to improve the performance of the mixed-flow pump by designing the impeller and diffuser in the mixed-flow pump. Geometric design variables were defined by the vane plane development which indicates the blade-angle distributions and length of the impeller and the diffusers. Firstly, the design optimization of the defined impeller geometric variables has been done. After that, the flow characteristics were analyzed in the point of incidence angle at the diffuser leading edge for the optimized impeller. Then design of the defined diffuser shape variables has been performed. The reason for the performance improvement was discussed by examining the flow characteristics through the diffuser.

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SC/Tetra를 이용한 HAWT모델에 대한 공력 해석 (Computational Analysis of Aerodynamic for a HAWT model using the SC/Tetra)

  • 박성근;윤성욱;임태균;전완호
    • 한국소음진동공학회:학술대회논문집
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    • 한국소음진동공학회 2010년도 춘계학술대회 논문집
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    • pp.336-337
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    • 2010
  • 본 연구는 현대자동차 무향 풍동(HAWT)에서 나온 실험치를 범용 CFD software인 SC/Tetra를 활용하여 모사하였다. 이를 위해서 우선 현대자동차 무향 풍동(HAWT)의 입력 경계층을 설정하고, grid test를 통해 최적의 격자를 찾고, 이에 맞는 난류 모델을 선정하였다. 입력 경계조건 설정, 격자 선정, 난류 모델 선정을 완료 후 나온 경계조건을 활용하여 실제 모델에 적용하여 현대 자동차 무향 풍동(HAWT)에서 나온 결과와 SC/Tetra에서 나온 결과와 비교 분석 하였다.

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수치해석을 이용한 파력발전용 임펄스 터어빈의 성능해석 (Analysis of Impulse Turbine for Wave Energy Conversion Using CFD Method)

  • 현범수;문재승
    • 한국해양공학회지
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    • 제18권5호
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    • pp.1-6
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    • 2004
  • This paper deals with the performance analysis and design of impulse turbine for owe type wave energy plant. Numerical analysis is performed using a commercial software FLUENT. This parametric study includes the variation of several important parameters, such as the number and shape of blades, hub ratio, and tip clearance. Since parametric study at various flow coefficients requires a considerable amount of computing time, two-dimensional analysis is employed to find out optimum principal particulars. Full three-dimensional calculations are also performed for several test cases, in order to confirm the validity of the two-dimensional approach. Up to the present stage, tentative results are demonstrated the usefulness of 2-D analysis.

회전용적형 기어펌프 유동의 2차원 수치해석 (Two-dimensional numerical simulation of volumetric gear pump flow)

  • 이중호;박종원;김태구;이상욱
    • 한국유체기계학회 논문집
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    • 제13권5호
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    • pp.17-21
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    • 2010
  • A volumetric gear pump is often used in extensive industrial applications to provide both high pressure and sufficiently high flow rate by physical displacement of finite volume of fluid with each revolution. To better understand the unsteady flow characteristics within the pump, numerical simulations were conducted by using moving dynamic meshing (MDM) techniques in commercially available CFD software, FLUENT. The effects of rotor clearance size and rotational speed of rotor on the flow characteristics, specially the temporal variation of velocity and pressure field, which is a main source of flow noise, was investigated. The results showed that significant reverse flow is developed in the rotor clearance and that its size is one of the most important factors affecting flow characteristics and pressure pulsation.

냉장고 증발기 배관의 2상유동양식 예측 및 소음 평가 (Prediction of Two-phase Flow Patterns and Noise Evaluation for Evaporator Pipe in a Refrigerator)

  • 허소정;김민성;한형석;정의봉
    • 한국소음진동공학회논문집
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    • 제21권10호
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    • pp.916-923
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    • 2011
  • The refrigerant after the expansion valve interchanges the heat at the evaporator. At this moment, the state of gas and liquid becomes two-phase flow and causes irregular noise. In order to avoid the noise, the two-phase flow pattern should be predicted. In this paper, the procedure to predict the two-phase flow patterns such as churn flow and annular flow was suggested using the CFD software. The experiments using refrigerant-supplying equipment was carried out and the noise levels according to the flow pattern were measured. The flow patterns predicted by this procedure showed good agreement with those by experiments. The churn flow is noisier than annular flow pattern.

CFD를 사용한 조력발전소 수문의 통수성능 연구 (Numerical Investigation on the Water Discharge Capability of Tidal Power Plant Using CFD)

  • 김건우;오상호;한인숙;안석진
    • 한국신재생에너지학회:학술대회논문집
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    • 한국신재생에너지학회 2011년도 추계학술대회 초록집
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    • pp.161-161
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    • 2011
  • The design methodology of the sluice caisson structure is one of important factor that is closely related to the efficiency in tidal power generation. When the sluice caisson is designed to maximize the water discharge capability, it is possible to minimize the number of sluice caissons for attaining the water amount required for achieving the target power generation, which results in reduction of the construction cost for the sluice caisson structure. The discharge capability of sluice caisson is dependent on the geometrical conditions of an apron structure which is placed in both sides of the sluice caisson. In this study, we investigated numerically the variation of water discharge capability of sluice caisson according to the geometrical conditions of apron. Flow fields are simulated with FLOW-3D software using VOF method.

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Numerical Modeling of an Inductively Coupled Plasma Based Remote Source for a Low Damage Etch Back System

  • Joo, Junghoon
    • Applied Science and Convergence Technology
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    • 제23권4호
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    • pp.169-178
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    • 2014
  • Fluid model based numerical analysis is done to simulate a low damage etch back system for 20 nm scale semiconductor fabrication. Etch back should be done conformally with very high material selectivity. One possible mechanism is three steps: reactive radical generation, adsorption and thermal desorption. In this study, plasma generation and transport steps are analyzed by a commercial plasma modeling software package, CFD-ACE+. Ar + $CF_4$ ICP was used as a model and the effect of reactive gas inlet position was investigated in 2D and 3D. At 200~300 mTorr of gas pressure, separated gas inlet scheme is analyzed to work well and generated higher density of F and $F_2$ radicals in the lower chamber region while suppressing ions reach to the wafer by a double layer conducting barrier.