Free Engineering Simulation Tutorial - Opensource Software & Simulation Guides

OpenFOAM · Solver Processing · 2026 OpenFOAM Solver Processing in 2026 The heart of every simulation: how to configure boundary conditions, mesh motion, physics models, numerical schemes and the right solver application to run an OpenFOAM case correctly. Pre-processing builds the mesh; post-processing shows the results — but processing is where the physics actually gets solved. This is the stage where OpenFOAM turns your case files into a flow field, and it's where the most important decisions live: the boundary conditions , any mesh motion , the physics models , the numerics , and the solver application you run. Get these right and the solver converges to an accurate answer; get them wrong and it diverges. This 2026 guide walks through all five, so you can set up the processing stage with confidence. What This Guide Covers What Is Processing? Boundary Conditions Mesh Motion Models Numerics Solver Applications Proce...

OpenFOAM · Pre-processing · 2026 OpenFOAM Pre-processing in 2026 The complete map of OpenFOAM's pre-processing tools — mesh generation, manipulation and conversion, surface utilities, and field initialisation — explained for real 2026 workflows. In CFD, the simulation is only as good as the preparation behind it — and in OpenFOAM, that preparation is pre-processing . Before a single solver iteration runs, you must build a mesh, clean up surfaces, and set sensible starting fields. OpenFOAM gives you a rich toolbox of command-line utilities for exactly this, organised into three areas: Mesh (generation, manipulation, conversion), Surface (utilities), and Field (initialisation). This 2026 guide walks through each, so you know which tool to reach for at every stage. What This Guide Covers What Is Pre-processing? Mesh — Generation — Manipulation — Conversion Surface Utilities Field Initialisation Typical Workflow ...

OpenFOAM · Fundamentals · 2026 OpenFOAM Fundamentals in 2026 The essentials every beginner needs: what OpenFOAM is, how a case is structured, the input files, the command line, and how to track and fix simulation issues. OpenFOAM is the most powerful free CFD toolbox in the world — and in 2026 it's more capable than ever. But because it's driven by text files and the command line rather than a single graphical button, beginners often feel lost at the start. This guide fixes that. We'll walk through the five OpenFOAM fundamentals you must master — what it is, the case structure, the input types, the command line, and tracking issues — so you can open any case and understand exactly what you're looking at. What This Guide Covers About OpenFOAM Case Structure Input Types (Dictionaries) The Command Line Tracking Issues The Basic Workflow Where to Go Next FAQ 1. About OpenFOAM OpenFOAM (Open-sour...

ANSYS Fluent · UDS · Beginner to Advanced User-Defined Scalar (UDS) in ANSYS Fluent What a UDS is, why it's so powerful, and how to use it — explained simply for beginners, then taken deeper for advanced users who want to customise every term with UDFs. Sooner or later, every CFD engineer hits a wall: "I need Fluent to track something it doesn't solve by default." Maybe it's the age of air in a room, a contaminant concentration , a custom radiation field , or your own physics. The answer is the User-Defined Scalar (UDS) — a spare transport equation Fluent will solve for any quantity you define . This guide explains it in plain language for Beginner readers first, then goes under the hood for Advanced users who want full control with UDFs. What This Guide Covers What Is a UDS? (Simple) Why & When to Use It The Transport Equation The Four Terms Setting Up a UDS (Steps) Customising with UDFs (Advance...