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가상경계기법을 통한 협착된 미세혈관에서 적혈구 분포의 수치 해석
윤대근(Daegeun Yoon),유동현(Donghyun You) 한국전산유체공학회 2019 한국전산유체공학회지 Vol.24 No.2
In order to investigate the distribution of red blood cells in a stenosed microvessel, three-dimensional blood flow simulations are conducted using immersed boundary methods. To treat deformable structures like blood cells, a continuous-forcing immersed boundary method is employed. Also, a ghost-cell immersed boundary method is employed to treat rigid and complex structures like a stenosed vessel. In the present study, two immersed boundary methods are integrated into a single computational framework by treating each structure separately. The present framework is validated through the simulation of blood flow in a straight microvessel compared with related previous studies. Present simulations of blood flow in a stenosed microvessel reveal that distribution of RBCs passing the stenosis is changed uniformly and the cell-free layer has significant spatial variation across the stenosis, which might induce the change of wall shear stress and flow resistance.
데이터 자율 거래를 위한 모니터링 툴 개발에 관한 연구
문승진(Sung Jin Moon),윤대근(Daegeun Yoon),박기성(Kisung Park),노성기(Sung Kee Noh) 한국통신학회 2022 한국통신학회 학술대회논문집 Vol.2022 No.11
본 논문은 트러스트 데이터 커넥톰에서 모바일 단말 및 개인 데이터 거래 플랫폼 간의 데이터 자율 거래 검증을 위한 모니터링 툴 개발에 관한 것이다. TDC에서는 사용자의 모바일 단말에서 수집된 개인 데이터를 거래 플랫폼으로 전달하고, 그 데이터를 타 사용자가 검색, 확인, 거래가 가능하다. 모바일 단말 앱과 개인 데이터 거래 플랫폼의 SW, 데이터 거래 프로세스를 분석하고 GUI(Graphical User Interface) API를 정의하여 모바일 단말 및 개인 데이터 거래 플랫폼간 모니터링 툴을 구현하였다.
선박 프로펠러에 의해 발생하는 수중방사소음에 대한 수치 해석
정재용(Jaeyong Jeong),김인녕(Innyoung Kim),윤대근(Daegeun Yoon),김성훈(Sunghoon Kim),유동현(Donghyun You) 한국전산유체공학회 2021 한국전산유체공학회지 Vol.26 No.1
Numerical simulations of turbulent flow, propeller cavitation, and induced underwater radiated noise over a marine propeller with a realistic ship geometry are conducted. Scaled ship geometries of the KVLCC2 hull and the KP458 propeller are considered in the present simulation. Turbulent flow past a marine propeller is investigated using incompressible large eddy simulation (LES) to accurately capture small scale turbulent fluctuations. In addition, to treat the propeller cavitation and track the cavity interface, a volume of fluid method (VOF) is used with the Schnerr-Sauer cavitation model. By using time series of fluid pressure and velocity field, acoustic pressure at the monitoring point is computed by the Ffowcs-Williams Hawkings (FW-H) acoustic analogy. The predicted acoustic pressure computed by integration on the cylindrical FW-H data surface are well matched with the experimental results measured at KRISO.