Regardless of whether you are a complete beginner in turbulence modelling and you are hearing the words Large Eddy Simulations (LES) for the first time today, or you are a seasoned CFD expert, I bet you that you have one thing in common: you will have gaps in your knowledge on LES. When you read …
The introduction to Large Eddy Simulations (LES) I wish I had Read More »
CFD is all nice and fun as long as we stay with 2D, laminar flows. As soon as we turn to 3D, turbulent flows, things start to get serious! Turbulence modelling is one of the most fundamental aspects of CFD, and if you want to have any chance of setting up a simulation that accurately models the …
The origin of turbulence and Direct Numerical Simulations (DNS) Read More »
This article will take a deep dive into how to solve the Navier-Stokes equations numerically. We will look at the differences between compressible and incompressible flows and what solution algorithms exist to solve them. Along the way, we will also look at the difference between the conservative and primitive (or non-conservative) variable formulation. We will …
How to solve incompressible and compressible flows in CFD Read More »
When setting up a simulation and running it as an unsteady simulation or even just a steady state simulation with pseudo time stepping, we need to decide if we want to use explicit or implicit time stepping. The choice will have consequences down the line, and we need to be aware of them. In this …
Explicit vs. Implicit time integration and the CFL condition Read More »
In our article on how to derive the Navier-Stokes equations from scratch, I showed you how we can derive the governing equations of fluid mechanics. Once we have found an equation that we want to solve, and we do not have an analytic solution available, we have to approximate a solution to that equation, for …
I’ll make a bet with you. By the end of this article, you will have changed your views on numerical dissipation. When you read the words numerical dissipation in the title, did you associate that with something good or bad? My guess is that you view numerical dissipation as something bad, and that would be …
What is numerical dissipation in CFD and why do we need it? Read More »
Have you ever added a CFD solver to your learning to-do list? I have, and it keeps growing! So, instead of creating a to-do list that will never be completed, I thought I’d spend some time on a solver that has been on it for quite some time and share my experiences with you. I …
Have you ever stopped and asked yourself, how do I know if my CFD simulation has actually converged? Well, you are not alone. Judging convergence is one those topics that, at first glance, doesn’t seem to be a very complicated matter, but upon further inspection you realise that this is a deep rabbit hole. In …
How to determine the best stopping criterion for CFD simulations Read More »
In this final article in our series on build automation, we look at how we can provide our own Conan recipe to compile and package our libraries with Conan so that we can store them in our local Conan cache for easy reuse in other projects. We will be able to put our own libraries …
How to use Conan to manage your own CMake-based libraries Read More »
In this article, we take a deep dive into CMake and see how we can use it to compile two simple projects: one to generate an executable and another one to generate a static library. We will pick up these examples from our previous article and see how we can modify them to incorporate a …