supercomputing center cfd grid research in n*grid project kisti supercomputing center chun-ho sung

Supercomputing Center

CFD Grid Research inCFD Grid Research in

N*Grid ProjectN*Grid Project

KISTI Supercomputing Center

Chun-ho Sung


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 Commun

ication

KISTI supercomputing center is a primary contractor of N*Grid


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


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 matu

rity.

Grand Challege problem can be solved through grid research (direct nu

merical simulation of turbulent flow).

Grid research can receive feedback from real application.


CFD in N*Grid

Virtual Wind Tunnel on Grid infrastructure

Flow analysisModule

Mesh GenerationModule

OptimizationModule

CADSystem


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)


High Throughput Computing Environment

Improved throughput for

Parametric study such as flutter analysis

Construction of response surface

Flutter boundary?Flutter boundary?

Computing GridComputing GridUnstableUnstable

StableStable


Preliminary Results

Supercomputer Grid Experiment

Taejon KISTICompaq GS320

KREONet2Globus/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


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

duy.kaist.ac.kr/jobmanager-pbs cluster.hpcnet.ne.kr/jobmanager-pbs

MPICH-G2

scheduler-pbs

scheduler-pbs

Execution nodes Execution nodes

duy.kaist.ac.kr/jobmanager-pbs cluster.hpcnet.ne.kr/jobmanager-pbs

MPICH-G2

scheduler-pbs

scheduler-pbs

Execution nodes Execution nodes



Simulation of a parallel multi-stage rocket

400 thousand grid points & 6 processors

Chimera methodology



Aerodynamic Design Optimization

RAE2822 airfoil design in 2D turbulent flow field

10 design variables & 4 processors

Adjoint sensitivity analysis


5 10 15Processors

2

4

6

8

10

12

14

16S

pee

d-u

p

GS320-SP2(Onera M6)

Ideal Case


Obtained parallel efficiency on supercomputer grid


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


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


Thank you for your attention!

supercomputing center cfd grid research in n*grid project kisti supercomputing center chun-ho sung

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