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...

CHT · CFD · Fluent / OpenFOAM / CFX Conjugate Heat Transfer (CHT) in CFD Software How to effectively handle coupled fluid-solid heat transfer — what CHT really is, how the coupling works, and exactly how ANSYS Fluent, OpenFOAM, CFX and STAR-CCM+ solve it. A 10 °C error in a chip's junction temperature can mean a recalled product; the same error in a turbine blade can mean catastrophic failure. Yet many thermal models still guess the heat transfer coefficient (HTC) at a wall. Conjugate Heat Transfer (CHT) removes that guesswork: it solves the fluid and the solid together, coupling temperature and heat flux at their shared interface for a true thermal prediction. This guide explains what CHT is, how the coupling works, and — crucially — how to handle it effectively in Fluent, OpenFOAM, CFX and STAR-CCM+ . What This Guide Covers What Is CHT? When to Use CHT How the Coupling Works CHT in ANSYS Flue...

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...

A real radiator has thousands of tubes and fins — meshing them all in CFD is impossible for a full vehicle or HVAC model. That's why ANSYS Fluent gives you the radiator boundary condition : a thin surface that reproduces the two things a radiator actually does to the air — it drops pressure and it exchanges heat . But Fluent won't accept your radiator's raw catalogue data. You must first develop the loss coefficient and heat transfer coefficient as functions of velocity. This guide shows exactly how — and the free calculator below converts your real radiator test data into the Fluent-ready polynomials. Table of Contents The Radiator BC Calculator What the Radiator Model Does The Loss Coefficient (kₜ) The Heat Transfer Coefficient Collecting Real Radiator Data Entering It in Fluent Radiator vs Porous Jump vs Heat Exchanger Common Mistakes FAQ The Radiator Boundary Condition Calculator Enter y...