How to read and modify system/fvSchemes in OpenFOAM 14: from equation terms to the six scheme families (ddt, grad, div, laplacian, interpolation, snGrad), defaults and overrides, upwind, linearUpwind, bounded, non-orthogonal correction, controlled A/B comparisons and error diagnosis.
The OpenFOAM 14 system/controlDict explained entry by entry: solver module for foamRun, simulated time, start and stop rules, write policies, purgeWrite, restarts, adaptive time stepping and run-time changes.
How to write and reason about the OpenFOAM 14 field files 0/U and 0/p: internalField and boundaryField, field classes and named dimensions, matching mesh patches, the mathematical meaning of fixedValue, zeroGradient and noSlip, foamDictionary checks and error diagnosis.
The Curve Digitizer inside GX-TXT: datasheet curves digitized within the framework, verifiable calibration and Datasets with provenance. It works with configurations, not workspaces. PDF manual included.
An introduction to GX-TXT, the environment I built to keep the data, analyses, curves, scripts and notes of an experiment together without ever losing data provenance. Beta on GitHub.
Neither a building freeze nor luxury towers: a three-layer model of the city, with logistics and services underground, reclaimed land and greenery at ground level, and social housing and public space at height, using density to serve inclusion. International precedents, technical limits and the Piazzale Loreto case.
Second part of the OpenFOAM 14 series: a 3D duct from eight vertices, the hex block, cell counts, simple and symmetric grading, boundary patches, blockMesh and checkMesh with expected values.
First part of the OpenFOAM 14 case-construction series: system, constant and time directories, the FoamFile header, dictionary syntax, dimensions and units, field files, macros and foamDictionary.
Three inlet velocities, same mesh and solver: maximum velocity and pressure gradient scale as Poiseuille predicts. How to isolate the effect of a boundary condition.
The same case in serial and with four MPI processes: SCOTCH decomposition, mpirun, reconstructPar, a 3.5× speed-up and numerical equivalence checked point by point.