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Automotive

The work
External aero, hundreds of runs a week
What decides it
The near-wall turbulence regime
Cost of being wrong
Drag counts, and the range they buy

What Courant catches here

  1. 01
    Unbounded convection

    A scheme that oscillates on k and moves the wake with it.

    limitedLinear on div(phi,k)
  2. 02
    Over-damped loops

    Damped hard enough that the residual stops for reasons that are not physics.

    relaxation 0.3
  3. 03
    A plateau read as convergence

    Flat is not converged, and it looks exactly like converged.

    1e−3, flat for 400 steps

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

  • ISO 26262Functional safety for road vehicles
  • ASME V&V 20Verification and validation in CFD and heat transfer
  • Automotive SPICEProcess assessment for automotive software

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

Solvers certified for this work

  • simpleFoam
  • pisoFoam
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Other industries

AerospaceConjugate heat transferEnergyFree surface and multiphaseDefenceHigh speed, no networkTurbomachineryRotating machinery