Tag: CFD

A repeatable protocol to decide whether an OpenFOAM 14 result is trustworthy: quantity of interest, a family of three meshes, iterative convergence and balances, comparison with the Poiseuille solution, observed order, Richardson extrapolation and GCI, time-step study and physical validation, with a script and a verification record.

Using ParaView 5.13 with OpenFOAM 14 to measure, not just to visualise: profiles with Plot Over Line, section averages and flow rates with Integrate Variables, pressure drop, comparison with the Poiseuille profile and an RMSE error, recirculation regions, CSV export and reproducible PVSM states, client/server from Windows.

An operating guide to checking an OpenFOAM 14 run from launch to result assessment: reading the log, residuals and continuity, function objects for residuals and probes, monitoring pressure drop and flow rate with surfaceFieldValue, mass balance, diagnosing typical patterns and a reproducible assessment from Windows.

An operating guide to using OpenFOAM 14 installed on a Linux server while working from a Windows PC: preparing cases in Notepad++, SFTP transfers with FileZilla, running over SSH from PowerShell with tmux, inspecting logs with klogg and visualizing results with ParaView connected to pvserver through an SSH tunnel.

The final unit of the course: the official v14 documentation, foamDictionary, foamSearch, foamInfo, foamToC and foamFind, systematic error diagnosis and a capstone case built from an empty directory.

From kinematic viscosity in physicalProperties to laminar, RAS and LES models in momentumTransport: what changes in a case when the physics changes, which fields become necessary and how to verify it with the OpenFOAM 14 tools.

What happens after discretisation in OpenFOAM 14: the A x = b system, the solvers dictionary of system/fvSolution, tolerance, relTol and maxIter, GAMG, smoothers and preconditioners, Final entries, relaxation and the SIMPLE and PIMPLE algorithms, with labs and worked answers.

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.