Journal
JOURNAL OF COMPUTATIONAL PHYSICS
Volume 233, Issue -, Pages 464-479Publisher
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jcp.2012.09.006
Keywords
Model validation; Validation metrics; Experimental measurement uncertainty; Median uncertainty; Cumulative uncertainty
Funding
- NASA [NNX08AM65A]
- NASA Postdoctoral Program at the Langley Research Center
- NASA [NNX08AM65A, 98863] Funding Source: Federal RePORTER
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A program of verification and validation has been undertaken to assess the applicability of models to space radiation shielding applications and to track progress as these models are developed over time. In this work, simple validation metrics applicable to testing both model accuracy and consistency with experimental data are developed. The developed metrics treat experimental measurement uncertainty as an interval and are therefore applicable to cases in which epistemic uncertainty dominates the experimental data. To demonstrate the applicability of the metrics, nuclear physics models used by NASA for space radiation shielding applications are compared to an experimental database consisting of over 3600 experimental cross sections. A cumulative uncertainty metric is applied to the question of overall model accuracy, while a metric based on the median uncertainty is used to analyze the models from the perspective of model development by examining subsets of the model parameter space. (C) 2012 Elsevier Inc. All rights reserved.
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