1. Supercomputing Center CFD Grid Research in N*Grid Project KISTI Supercomputing Center Chun-ho Sung

2. Supercomputing Center Introduction to N*Grid What is N*Grid?  Korean Grid research initiative Construction and Operation of the Korean National Grid N*Grid includes  National Computational Grid  National Data Grid  National Access Grid  National Application Grid (Ex: Bio Grid, CFD Grid, Meteo Grid etc) Funded by Korean government through Ministry of Information and Communication KISTI supercomputing center is a primary contractor of N*Grid

3. Supercomputing Center Scope of N*Grid High Performance Computational Grid  Supercomputers  High performance clusters Advanced Access Grid  Massive data distribution and processing (Data Grid)  Collaborative access grid  Immersive visualization Grid Middleware  Information service, Security, Scheduling, … Search and support of Grid Application Project (Seed Project)  Grid application testbed  Grid application portals  Grid applications

4. Supercomputing Center CFD & Grid Research CFD – computational fluid dynamics  Nonlinear partial differential equations – Navier-Stokes equations  Requires huge amount of computing resource  The most limiting factor is computing power! CFD in Grid research  It can fully exploit the power of computing grid resources.  Parallel/Distributed computing algorithm in CFD shows high level of maturity.  Grand Challege problem can be solved through grid research (direct numerical simulation of turbulent flow).  Grid research can receive feedback from real application.

5. Supercomputing Center CFD in N*Grid Virtual Wind Tunnel on Grid infrastructure Flow analysis Module Mesh Generation Module Optimization Module CAD System

6. Supercomputing Center Components of Virtual Wind Tunnel CAD system  Define geometry, integrated in grid portal Mesh Generator  Multi-block and/or Chimera grid system  Semi-automated mesh generation Flow Solver  3-dimensional Navier-Stokes code parallelized with MPI Optimization Module  Sensitivity analysis, response surface etc Database  Repository for geometries and flow solutions  Communicate with other discipline code (CSD, CEM)

7. Supercomputing Center High Throughput Computing Environment Improved throughput for  Parametric study such as flutter analysis  Construction of response surface Flutter boundary? Computing Grid Unstable Stable

8. Supercomputing Center Preliminary Results Supercomputer Grid Experiment Taejon KISTI Compaq GS320 KREONet2 Globus/MPICH-G Pusan Dong-Myoung. Univ. IBM SP2 Chonan/Soongsil Univ. Cluster Chonbuk N. Univ. IBM SP2 Chonbuk N. Univ.: IBM SP2 KISTI: Compaq GS320

9. Supercomputing Center Preliminary Results – Cont. Cluster Grid Experiment  2 Linux PC cluster systems over WAN  duy.kaist.ac.kr : 1.8GHz P4 4 nodes, RAM 512M  cluster.hpcnet.ne.kr : 450MHz P2 4 nodes, RAM 256M  F90, PBS, MPICH-G2, GT2.0

10. Supercomputing Center Preliminary Results – Cont. Simulation of a parallel multi-stage rocket  400 thousand grid points & 6 processors  Chimera methodology

11. Supercomputing Center Preliminary Results – Cont. Aerodynamic Design Optimization  RAE2822 airfoil design in 2D turbulent flow field  10 design variables & 4 processors  Adjoint sensitivity analysis

12. Supercomputing Center Preliminary Results – Cont. Obtained parallel efficiency on supercomputer grid

13. Supercomputing Center Ongoing Efforts CFD portal  PHP based web interface  GPDK for next version  Integrated PRE/POST processing interface High throughput computing Environment  Generate parameter set  Distribute/Submit jobs  Collect results Improved parallel algorithm Adequate for WAN

14. Supercomputing Center Remarks Most application engineers are reluctant to use grid, since they believe that it is just a WAN version of parallel computing We need to prove power of grid environment to application engineers, in order to encourage to use a new grid technology Therefore, it is very important to show the capabilities of grid services and what can be done with those services

15. Supercomputing Center Thank you for your attention!