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

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

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

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.

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

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)

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

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

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

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

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

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

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

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

Supercomputing Center Thank you for your attention!