Imagine you take a photo of a friend with a very cheap camera — it's blurry. You buy a better camera and the photo looks sharper. You buy an even better one… and now it looks exactly the same as the last one. At that point, buying a more expensive camera is a waste of money — the picture won't improve. A grid independence test in CFD works exactly like this. It answers one simple question: "Is my mesh good enough, or do I need more cells?" This guide explains the whole idea in plain language, so any student can understand it and do it correctly. Figure 1. A grid independence test compares the same simulation on several meshes — coarse, medium and fine. More cells mean more accuracy but slower computation. The test finds the point where adding cells no longer changes the answer. Table of Contents What Is a Grid Independence Test? Why Do We Need It? The Big Idea (in Simple Words) How to Do It — Step by Step How to Read the ...
This blog offers easy-to-follow tutorials on CFD, FEA, CAD modeling, and AI/ML applications. You’ll find practical examples using OpenFOAM, FreeCAD, FDS, eQuest, ANSYS, and other tools—built to help students, researchers, and engineers learn simulation and machine-learning techniques step by step.