CFD Analyses on Cactus PSE(Problem Solving Environment)

'The Grid' means the collaboration of computing and experimental resources in dispersed organizations by high-speed network. It has been paid much attention for an unlimited number of potential resources available and the easiness to build collaborative environments among multiple disciplines. However, the difficulty in establishing the environments and accessing and utilizing the resources has prevented application scientists from conducting Grid computing. Thus, the present study focuses on building PSE(Problem Solving Environment) which assists application researchers to easily access and utilize the Grid. The Cactus toolkit, originally developed by astrophysicists, is used as a base frame for Grid PSE. Some modules are newly developed and modified for CFD(Computational Fluid Dynamics) analysis. Simultaneously, a web portal, Grid-One portal, is built for remote monitoring/control and job migration. Cactus frame through the web portal service has been applied to various CFD problems, demonstrating that the developed PSE is valuable for large-scaled applications on the Grid.OAIID:oai:osos.snu.ac.kr:snu2005-01/104/0000004648/32SEQ:32PERF_CD:SNU2005-01EVAL_ITEM_CD:104USER_ID:0000004648ADJUST_YN:NEMP_ID:A001138DEPT_CD:446CITE_RATE:0FILENAME:Cactus_PSE의_활용을_통한_전산유체역학_문제_해석.pdfDEPT_NM:기계항공공학부EMAIL:[email protected]:

차세대 컴퓨팅 환경에서의 다단 로켓의 단 분리 거동에 대한 연구

Thesis(doctors) --서울대학교 대학원 :기계항공공학부, 2008.2.Docto

기저부 유동 및 난류가 다단 로켓의 단 분리 운동에 미치는 영향 = Effect of base flow and turblulence on the separation motion of strap-on rocket boosters

Turbulent flow analysis is conducted around the multi-stage launch vehicle including base region and detachment motion of strap-on boosters due to resultant aerodynamic forces and gravity is simulated. Aerodynamic solution procedure is coupled with rigid body dynamics for the prediction of separation behavior. An overset mesh technique is adopted to achieve maximum efficiency in simulation relative motion of bodies and various turbulence models are implemented on the flow solver to predict the aerodynamic forces accurately. At first, some preliminary studies are conducted to show the importance of base flow for the exact prediction of detachment motion and to find the most suitable turbulence model for the simulation of launch vehicle configurations. And then, developed solver is applied to the simulation of KSR-III, a three-stage sounding rocket researched in Korea. From the analyses, after-body flowfield strongly affects the separation motion of strap-on boosters. Negative pitching moment at initial stage is gradually recovered and a strap-on finally results in a safe separation, while fore-body analysis shows collision phenomena between core rocket and booster. And a slight variation of motion is observed from the comparison between inviscid and turbulent analyses. Change of separation trajectory based on viscous effects is just a few percent and therefore, inviscid analysis is sufficient for the simulation of separation motion if the study is focused only on the movement of strap-ons.본 연구는 서울대학교 BK-21 기계분야 사업단의 지원과 한국과학기술정보연구원의 '제6차 전략과제 지원'을 통한 조금원 박사의 자문을 통해 수행됨

e-AIRS: e-Science 인프라 기반의 항공우주 공력통합연구 환경구축 = e-AIPRS : Construction of an Aerodynamic Integrated Research System on the e-Science Infrastructure

e-AIRS는 e-Aerospace Integrated Research System의 약어로, e-Science 인프라를 기반으로 한 항공우주 통합연구 환경을 말한다. 이러한 항공우주 통합연구 환경구축을 위한 첫 단계로, 공력분야의 통합연구를 위한 환경을 구축하였으며, 현재 e-AIRS 웹 포털을 통하여 수치해석 연구의 전 과정을 수행할 수 있으며, 풍동실험의 요청 및 수치해석결과와 실험결과의 비교 연구, 그리고 협업 시스템을 이용한 연구자간의 협력 연구를 수행할 수 있다. 본 논문에서는 이러한 e-AIRS 시스템의 구조와 기능 및 활용에 대해 설명한다. ; e-AIRS, an abbreviation of 'e-Aerospace Integrated Research System', is a virtual organization designed to support the aerospace engineering processes in the e-Science environment. As the first step toward a virtual aerospace engineering organization, the e-AIRS intends to give a full support to aerodynamic research processes. Currently, the e-AIRS can handle both the computational and experimental aerodynamic researches on the e-Science infrastructure. In detail, users can conduct the full CFD(Computational Fluid Dynamics) research processes, request wind tunnel experiments, perform the comparative analysis between computational and experimental resultants and finally collaborate with other researchers using the web portal. The current paper will describe those functions and the internal architecture of the e-AIRS system.본 연구는 과학기술부와 한국과학기술정보연구원, 서울대학교 항공우주신기술연구소의 지원으로 수행되었음

Construction of Numerical Wind Tunnel Supporting Automatic Numerical Simulation and Remote experiment Management

OAIID:oai:osos.snu.ac.kr:snu2006-01/104/0000004648/6SEQ:6PERF_CD:SNU2006-01EVAL_ITEM_CD:104USER_ID:0000004648ADJUST_YN:NEMP_ID:A001138DEPT_CD:446CITE_RATE:0FILENAME:자동_수치해석과_원격_실험_관리를_지원하는_수치_풍동_구현.pdfDEPT_NM:기계항공공학부EMAIL:[email protected]: