Day 4
Welcome back to Day 4. Today we will go even further into the depths and find, where the rubber meets the road (at least mathematically). We will have a special focus on discretization. Why is this important? Did you ever try to solve the fluid dynamic equations for an arbitrary industrial application by hand? Well... In most cases it is a better idea to break down the partial differential/integral equations into "simple" operations (+,-,*,/) and solve them for "small" volumens (yes, the cells in your mesh). This is called discretization. Today you will gain the knowledge, how this works.
Go back to "3 weeks" series.
Discretization
To kick things off, follow this tutorial on discretization and the influence of different schemes on the simulation results. Here the focus is on:
- spatial discretization
- face interpolation
- changing schemes in OpenFOAM
- divergence schemes
- influence of discretization on the simulation results of a passive scalar
- postprocessing
Discretization strategies
In this tutorial you will find strategies on how to improve your simulation results by optimizing the utilized discretization settings. The focus is on
- gradient scheme
- gradient limiter
- convection discretization
- face interpolation
- diffusion discretization
Summary of theory
To conclude this day, in this tutorial you will find an in depth summary of the theory of CFD and also OpenFOAM. A brief list of the topics covered:
- finite volume method
- CFL number
- linear solvers
- solution methods
- unsteady and steady simulation
- residuals
- boundary and initial conditions
End of Day 4
Thank you for finishing the fourth day. We really-really hope, that you did not skip this day. It is a dry topic, but it is essential for understanding how to run high-quality simulations. Bare with us. Tomorrow on Day 5 we have some fun simulations for you.
Until then take a break!
Now let's take a rest.
