Mason Shopperly

Notes · the working surface

Notes from a working surface.

active
8
last touched
Apr 28, 2026

FOCUS Numerics from Zingg's two books, an espresso build on the bench, a Z4 N54 ignition pass, and an X5d on the lift for a guibo diagnosis.

Active · in motion

  1. ACTIVE research

    Working through the Zingg two-book arc

    The two-book numerics arc — analytical foundations, then shock-capturing — rebuilt on my own time. CFDLab is the artefact that came out the other side.

    NEXT Promote FLOMG transonic to a fully-narrated atlas section; add a JST-vs-Roe contact-only crop.

    ■■■■■□ Python · ARC1D · FLOMG · upwind1d Touched 2026-04-28
  2. ACTIVE machine

    BMW E70 X5d — drivetrain rumble, suspect the guibo

    Diesel X5 with a low-rpm rumble that builds with load. First suspect is the driveshaft flex disc — the guibo. Diagnosis pass before any parts go on.

    NEXT Inspect the front guibo on the lift, mark and rotate, look for cracking or play before ordering the replacement.

    ■□□□□□ E70 X5d · lift · hand tools Touched 2026-04-28
  3. ACTIVE machine

    BMW X1 28i (2017) — coils + plugs reset

    Full ignition baseline reset on a 2017 X1 28i — coils and plugs replaced as a single pass so any subsequent misfire diagnosis starts from a known-good state.

    NEXT Drive a couple of cycles, scan for codes, confirm idle and part-throttle behaviour.

    ■■□□□□ X1 28i (2017) · hand tools Touched 2026-04-28
  4. ACTIVE machine

    Yamaha Enticer 250 — bogey wheel sitting on the track edge

    Belt replaced and ski repair done. The remaining thread is the bogey wheel that's been riding the inside edge of the track — a geometry problem, not a parts problem.

    NEXT Pull the rear suspension, measure wheel alignment against the track, and reset the offending bogey before another belt walks.

    ■□□□□□ Enticer 250 Touched 2026-04-28
  5. ACTIVE extraction

    Gaggiuino — PID and profiling on a Gaggia Classic Pro

    Open the Classic Pro, replace its internals with an open-source PID + pressure-profiling controller, close it back up. Started for the value-per-dollar; staying for the repeatability.

    NEXT Finish the dimmer + pressure-transducer wiring; pull the first profiled extraction.

    ■■□□□□ Gaggia Classic Pro · Gaggiuino · ESP32 Touched 2026-04-26
  6. ACTIVE research

    Ahmed body — y⁺ pass on the baseline grid

    Wall-resolved versus wall-modelled. What the residual histogram says about the inflation layer on the M25 baseline.

    NEXT Re-run with y⁺ < 1 in the wake; compare drag convergence and y⁺ map against the M25 baseline.

    ■■□□□□ OpenFOAM · Python Touched 2026-04-25
  7. ACTIVE research

    What SBP operators are actually doing at a boundary

    A field engineer's read of summation-by-parts: where the dual norm earns its name, and where it doesn't.

    NEXT Tighten the dual-norm bookkeeping for the third-order Gregory closure on a non-uniform grid.

    ■■■■□□ MATLAB · LaTeX Touched 2026-04-22
  8. ACTIVE machine

    BMW E89 Z4 — maintenance log

    Oil filter housing gasket, ignition coils and plugs, catalyst downpipes, upgraded charge pipe, factory diverter removed for a TiAL BOV. Done in the driveway.

    NEXT Verify boost behaviour with the new charge pipe + TiAL setup; check for any post-install codes.

    ■■■□□□ E89 Z4 · hand tools Touched 2026-04-20

Notes that feed back into Work

Lanes

∂ research · active
turbulence, numerics, CFD analysis
✈ fieldbook
where flying meets the solver
🛠 machine · active
diagnosis, teardown, tuning, hardware
☕ extraction · active
espresso, profiling, repeatable craft
※ atmosphere
place, light, weather

Notes are short — a working artefact, not a publication. For the finished projects, see /work. For the broader story, /about.