Difference between revisions of "Day 2"

Welcome back to Day 2. Today is all about widening and extending our experience in OpenFOAM. Yesterday we learned a lot about the basic work flow and simple mesh creation, today we will start going into the depth of OpenFOAM and go through the entire CFD workflow until postprocessing. We will focus in

• more detailed understanding of the work flow
• further short and fun simulations
• grid convergence
• transport equations
• detailed scientific visualization of results

Go back to "3 weeks" series.

Cavity - Revisited

Yesterday you already completed this tutorial several times. Here you will be taken into the depth of an OpenFOAM case in order to understand all the important in- and outputs required for a CFD simulation in OpenFOAM.

• details on OpenFOAM directory organization
• directory structure of an application/utility
• applications/utilities in OpenFOAM
• directory structure of an OpenFOAM case
• simulation workflow
• details on the in- and output of an OpenFOAM case

Grid convergence

By now, you should be familiar to the basics of OpenFOAM. Let us continue with some general CFD topics, still covered in OpenFOAM. In this video you will learn the importance of grid resolution and its effect onto your results. The pdf version can be found here.

• field initialization with setFields
• mesh refinement with blockMesh
• simulation of a 1D shock tube case
• influence of mesh refinement on the simulation results
• postprocessing

Patching fields

Use the sonicFoam solver, simulate 0.007 s of flow inside a shock tube, with a mesh with 100, 1000 and 10000 cells in one dimension, for initial values 1 bar/0.1 bar and 10 bar/0.1 bar.

• To understand the setFields utility
• Learn how to specify initial and boundary conditions
• Investigate effect of grid resolution

Transport equation

Another important general topic is the general transport equation. Here, you will get a basic idea on the structure of the equations, which are solved in CFD and also in OpenFOAM. The pdf version can be found here.

• the solver
• case setup
• transport phenomena like convection and diffusion
• influence of constants
• simulation of scalar transport
• post processing

Taylor Couette flow

In this short tutorial you will experience your first steady state simulation, where you can directly compare your results with experiments from literature. Here the focus will be on:

• case, geometry and mesh setup
• boundary conditions
• solution evaluation and post processing
• comparison with theory and experiments from literature

Residence time distribution

Use the simpleFoam and scalarTransportFoam to simulate the flow through a square cross section T pipe and calculate RTD (Residence Time Distribution) for both inlets using a step function injection.

• Understanding RTD calculation using OpenFOAM
• Using multiple solver for a simulation

Postprocessing in Paraview

This tutorial gives an extensive introduction into postprocessing in the open source postprocessor Paraview. Here you will take already simulated cases and only take a look at the results in Paraview. With this you should get a first idea about the possibilities in the software. The following cases will be cosidered:

• cavity
• 3D damBreak
• goldschmidt
• motorbike
• propeller

Sampling

Simulate the flow along a shock tube for 0.007 s and use OpenFOAM sampling utility for extracting the data along a line during the simulation and after the simulation.

Scientific visualization with paraview

In this tutorial you will get a deep understanding on the scientific postprocessing and visualization of results in Paraview.

The following topics will be covered:

• Postprocessing
• ParaView in a nutshell
• ParaView vs. paraFoam
• ParaView GUI overview
• Basic usage – Sources and filters
• Scientific visualization with paraFoam/ParaView

Auxiliary Postprocessing

In this tutorial your will find useful information on how to postprocess your simulation results with the tools swak4Foam and PyFoam.

End of Day 2

Thank you for finishing the second day. We hope, that you are still having fun. Let's continue tomorrow with Day 3.

Now let's take a rest.