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Computational Fluid Dynamic Simulations of a Centrifugal Pump Using Commercial Software based on Finite Volume Method and Finite Element Method
No full textComputational fluid dynamic (CFD) simulations of a centrifugal pump have been performed using commercial CFD tools which are each based on finite volume (FVM) and finite element method (FEM). In this work, ANSYS FLUENT and midas NFX CFD were used for FVM and FEM CFD solver, respectively. A multiple reference frame was considered to model rotating and stationary parts for pseudo-transient simulations and a sliding mesh was used for a full time-transient calculations. Two different mesh systems were generated, which of each was appropriate for FVM and FEM to have converged solutions. The general characteristics of fluid flow within the centrifugal pump were compared between FLUENT and NFX and the difference of pressure change between inlet and outlet surface calculated by the two CFD tools were also investigated. The differences of pressure increases for the various flow rates between FVM and FEM pseudo-transient simulation were within 2%, which reflected that the flow behavior such as pressure and velocity within the pump was predicted similarly each other. It was also found that the results obtained from FLUENT were more sensitive to including time consideration than those from NFX
Possible production of neutron-rich Md isotopes in multinucleon transfer reactions with Cf and Es targets
No full textThe possibilities for production of yet unknown neutron-rich isotopes 261–265Md are explored in the multinucleon transfer reactions with stable beams bombarding on Cf and Es targets. The production of a given isotope of neutron-rich Md is optimized by appropriate choices of projectile-target combinations and bombarding energies. The production cross sections of neutron-rich Md isotopes in the 0n and 1n evaporation channels of multinucleon transfer reactions are compared. The prospects for the use of radioactive beams in the production of new Md isotopes are discussed
Integration of air pollution data collected by mobile sensors and ground-based stations to derive a spatio-temporal air pollution profile of a city
No full textCase of Dynamic Performance Optimization for Hydraulic Drifter
No full text그간 국내 유압 드리프터는 해외 선진사의 제품을 벤치마킹하여 개발되었지만, 이는 한국형 유압드릴 파워팩 특성(대유량, 저압)에 적합하지 않아 우수한 타격성능을 나타내지 못하였으며, 이로 인해 최적설계에 대한 연구 진행도 미진한 상태였다. 이에 본 연구에서는 대유량을 소화할 수 있도록 용량이 재설계된 유압 드리프터에 대해 다목적함수 최적화를 수행하고, 이를 통해 타격출력 향상과 공급압력 및 서지압력을 감소시키는 것을 목표로 한다. 이러한 연구의 진행방법을 요약하면 다음과 같다. 먼저 타격출력과 공급압력 및 서지압력 개선에 대한 목표를 설정하고 이에 대한 다목적함수 최적화를 수행한다. 이후 최적화된 설계치로 제작된 시제품의 시험결과와 해석모델의 해석결과 비교를 통해 최적화된 해석모델의 신뢰성을 확보한다. 본 연구에서는 유압시스템 해석 소프트웨어인 SimulationX와 다목적함수 최적화 프로그램인 EasyDesign이 사용되었으며, 위와 같은 연구를 통하여 한국형 유압드릴에 적합한 고출력 드리프터 개발 목적에 부합하는 결과를 얻을 수 있었다
Development of public R&D-company matching network based on technology-commercialization case
No full textDevelopment of pipeline optimization technology for whole-genome sequencing variation analysis based on supercomputer
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