Validation of CFD Simulation for Divertor toward Predicting Plasma by 3KWxOOoP


									    Integrated Modeling Approach and


           M. Narula and team (UCLA), P. Wilson and
               team (UW) R. Munipalli and team
           (HyperCom), M. Ulrickson and team (SNL)

                      FNST Meeting
                   August 12-14, 2008
8-Aug-12                                              1
            Integrated Modeling for FNST
 • Multi-physics based integrated analysis is becoming increasingly
   visible in many diverse areas ranging from nano technology to bio
   technology to aerospace applications

 • An Integrated Simulation Predictive Capability (ISPC) is envisioned
   for Fusion Plasma Chamber Systems for near term machines
   (ITER/CTF) as well as DEMO

 • The ISPC will allow for design optimization, performance evaluation,
   failure mitigation, and operational control of fusion plasma chamber
   systems (Blanket, First Wall and Divertor, etc)

 • The development of a strong ISPC will provide a natural interface
   linking to the Fusion Simulation Project (FSP)

 • The ISPC will be further benchmarked against ‘real fusion
   environment’ results from ITER/CTF to provide a strong predictive
   capability for DEMO

8-Aug-12                                                                  2
                The Plan for ISPC development
• The development of the ISPC should follow a logical
  progression guided by…
    – The need to fill in the modeling gaps for the design and
      development of ITER/CTF FW/blanket and divertor components
           • Advances in handling complex geometries, CAD and high
             performance computing
    – Strengthening the R&D in FNST
    – The need to integrate component level modeling to system level
    – The plans and timelines and requirements for the Fusion
      Simulation Project
• Ultimately leading to…
    – Development of a predictive capability for DEMO, strongly
      benchmarked with the experimental data obtained from the ‘real
      fusion environment’ on ITER and CTF
8-Aug-12                                                               3
    An Approach defines four categories based on broad
                 discipline or expertise
                           Integrated modeling

 Multi-physics and
                        High fidelity data    Visualization    Analysis
specialized physical
                       mapping/translation                    Management
 • Advances in fusion relevant specialized phenomenological modeling will
   come through the fusion community in terms of advanced research codes
   (plasma surface interaction modeling, liquid metal MHD, pebble bed
   thermo mechanics, tritium permeation etc)
 • Data mapping and interpolation across various analysis meshes/codes has
   to be fast, accurate and satisfy physical conservation laws. Advances in
   data interpolation algorithms will come from developments in applied
   mathematical modeling
 • Advances in visualization techniques as well as code management fall into
   the realm of computer science and graphics.
  8-Aug-12                                                              4
Integrated Modeling for FNST: A Multi-physics environment
                                              Dynamic structural forces from EM disruption
                                                      Coupled thermomechanical/irradiation
   FW/Plasma Facing                                                         material damage
   Surface Phenomena
                                             Neutron wall load     Non-Linear, Multi-scale
                           T     DMS                                        flow phenomena
                                                                                       Etc.
      CAD Modeler
                                 q”                                     DMS

                                             Fluid Dynamics                   FUN
                                                LM MHD

                                         Species Transport

      DMS                                      Specialized
                                       FUN     physics models                       Safety

     Translators                             Stress-Analysis
     Data Mapping Script

     specialized user FUNction                                  FUN

 8-Aug-12                                                                                    5
  It requires the ‘right mix’ of expertise through all
    Open source               Fusion Community
  (ITAPS/SciDAC)               In-house Codes

                                  Constitutive equations
    3rd Party Software          (embedded user sub routines)

       SBIR                    Applied mathematics

   A coordinated approach can avoid duplicated efforts

8-Aug-12                                                       6
         Progress on where there is no coupling
                between physics codes
  • Nuclear heating to temperature
     – MCNP to CFD codes
  • Temperature to stress/displacement under transients
     – Direct coupling versus sequential analysis
              Geometry CAD

CFD Solid Domain      Structural code            Structural code
Nodal Temperatures    meshes                     meshes Nodal
                      (ANSYS/ABQUS)              temperatures

     Geometry CAD
                        Structural code meshes        Structural code
                        (ANSYS/ABQUS)                 temperature
 CFD Solid Domain
 Nodal Temperatures
                       Calculate heat transfer      Stress/Deformation
  8-Aug-12                                                                 7
Modeling activity for ITER First Wall Qualification Testing under MARFE
Modeling Requirements:                              Required Analyses:
Identification of experimental testing              Time dependant thermo-fluid analysis (to obtain
parameters                                          time dependant temperature field)
                                                    Thermal stress analysis based on time dependant
Assessment of experimental safety                   temperature field data
Interpretation of experimental data                 Temperature dependant physical properties for
                                                    thermo-fluid and thermal stress analysis
                                    CAD Model

     Thermal-Fluid             Temperature Data Mapping           Thermal-structure

    8-Aug-12                                                                                     8
 Ability to provide data mapping between CFD meshes
         and structural meshes is advantageous
               Many coolant channels
 CAD model

                                                   Domain solid

8-Aug-12   He coolant temperatures                            9
 Progress on where a coupling exists (keff= f(e,T))

Be pebble bed strain profiles at 1 cm away from the back     Isometric view of von Mises
of the FW. Top: first iteration; bottom: second iteration.   elastic strain distribution in Be

   Keff increases as temperature and strain increase

    8-Aug-12     1st Iteration            2nd Iteration             3rd Iteration       10
    The Challenge – Simulating FW/divertor/blanket
    response to ITER shots
                                                       Mesh of a 40 degree ITER VV and
 Multi-physics, integrated                                            FW/Shield sector
  simulations where the
  US can lead the world
 State-of-the-art computer codes can
  handle large scale simulations

               ITER CFD model

                                            FW/Shield/VV response to ITER shots
               Plasma chamber temperature
                                            is a key issue for ITER reliability -- any
               response to ITER H-H shots   small leak will shut down plasma
                                            operations for a long repair time
8-Aug-12                                                                          11

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