CFD Grid Research in N*Grid Project

1
CFD Grid Research inNGrid Project

• KISTI Supercomputing Center
• Chun-ho Sung

2
Introduction to NGrid

• What is NGrid?
• Korean Grid research initiative
• Construction and Operation of the Korean National
  Grid
• NGrid 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 NGrid

3
Scope of NGrid

• 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
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
CFD in NGrid

• Virtual Wind Tunnel on Grid infrastructure

6
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
High Throughput Computing Environment

• Improved throughput for
• Parametric study such as flutter analysis
• Construction of response surface

8
Preliminary Results

• Supercomputer Grid Experiment

9
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

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Preliminary Results Cont.

• Simulation of a parallel multi-stage rocket
• 400 thousand grid points 6 processors
• Chimera methodology

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Preliminary Results Cont.

• Aerodynamic Design Optimization
• RAE2822 airfoil design in 2D turbulent flow field
• 10 design variables 4 processors
• Adjoint sensitivity analysis

12
Preliminary Results Cont.

• Obtained parallel efficiency on supercomputer grid

13
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

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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

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Thank you for your attention!