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The work
Two phases and the interface between them
What decides it
Where the surface is, and how sharp
Cost of being wrong
A separator sized on a wrong answer

What Courant catches here

  1. 01
    Unbounded phase fraction

    It is bounded every step, until the step is too long.

    alpha max 1.0004
  2. 02
    The wrong Courant number

    The interface number reported in place of the bulk one, which is the one that bites.

    1.11 reported · 1.24 actual
  3. 03
    Convergence on a moving field

    A run called converged on a residual that measures interface motion.

    judged on alpha

What comes back

  • The cause, and the line of solver output it came from
  • The change, as a diff you can reverse
  • Four physics checks, measured against their limits
  • A record somebody else can open on a link

What this work is held to

  • ASME V&V 20Verification and validation in CFD and heat transfer
  • IEC 61508Functional safety of electrical and electronic systems
  • ASME BPVCBoiler and pressure vessel code

Courant holds none of these certifications. It produces the verification record they ask you to keep.

Solvers certified for this work

  • interFoam
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Other industries

AerospaceConjugate heat transferAutomotiveExternal aerodynamicsDefenceHigh speed, no networkTurbomachineryRotating machinery