NCSU UACE Workshop on Management of Numerical Errors In Nuclear Systems Modeling

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NCSU U-ACE Workshop onManagement of Numerical
Errors In Nuclear Systems Modeling

• Hosted by
• North Carolina State University
• Academic Center of Excellence In Modeling And
  Simulation
• September 13th - 14th, 2007

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Premise and Challenge

• Can modeling and simulation assist decision
  making process?
• Reduce reliance on expensive experiment
• Increase reliance on cheap computer power
• Advancing predictive capabilities
• High fidelity
• Rigorous verification and validation

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Gain

• Advanced predictive capabilities will allow
  evaluation of uncertainties of key performance
  metrics and determine best ways to minimize
  them.
• Sources of uncertainties include
• Input data uncertainty 'Previous Workshop'
• Numerical errors
• Modeling errors

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Purpose of Workshop

• To overview and discuss potential of emerging
  methodologies to quantify and control simulation
  errors that originate from numerical methods
  approximations, as applied to various stages of
  the nuclear fuel cycle.

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Format of Workshop

• A limited number of invited review presentations
  will be made followed by group discussions of
  latest methodologies to quantify and minimize
  numerical errors.

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Discussion

• Reliability of a posteriori error estimates can
  we derive, and then afford, guaranteed error
  bounds for complex nonlinear time-dependent
  equations? What are acceptable efficiency
  indices? What is an acceptable cost with respect
  to solution time
• Are there common directions that laboratories
  should follow in advancing error estimation?
• What is the role of VV and UQ in efforts to
  advance error estimation techniques?
• How do we account for errors due to geometry
  approximation?
• I How do we efficiently select time steps to
  control time integration errors?
• .
• ..

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Outcome of Workshop

• Complete gap analysis indicating where needs for
  additional RD are required
• Identify where ongoing RD outside nuclear power
  can contribute to addressing needs
• Establish professional relationships between
  workshop participants leading to future
  collaborative activities

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Logistics

• All meetings in room 1112 and dinner in rooms 7A
  and 7B
• Bathrooms are located XXX
• Transportation from/to hotel and McKimmon center
  as needed
• Wireless connection is available in the building

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Acknowledgements

• INL for financial support
• Mike Pernice of INL for plenary discussions about
  the workshop focus areas and suggestions of
  potential participants
• Ms. Hermine Kabbendjian for arranging workshop
  logistics