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Case Study

NASA's Legacy Code vs. xStream. The Margin Was Under 5%.

Before retiring their GTRAN model, North Wind needed proof xStream could match it. The validation results made the decision easy. 

 North Wind Test LLC had decades of confidence in NASA's GTRAN code. Before making the switch to a modern platform, they ran a rigorous side-by-side validation across a 0 to 2 second transient. xStream matched GTRAN's pressure fluctuation magnitudes and mass flow behavior within approximately 5% -- with nearly exact timing alignment on every spike and trough. 

  • Pressure and mass flow results matched GTRAN within approximately 5%
  • Pressure spike timing aligned nearly exactly across the full transient window
  • Revealed unique tank-to-tank ringing behavior not previously captured
  • Enabled full transition to a modern, maintainable toolset

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