flostr

flow structure analysis

Thesis C JAKE ALLAN EDWARDS.pdf

Developed in conjunction with:

• andrefvaq
• G. D. McBain
• SamMallinson
• TracUNSW
• JakeEdwards (pythonpadawanexe)

Installation

Miniconda

Download one of the Miniconda Windows Installers and run it.

(Anaconda is fine too.)

conda env

In the Anaconda PowerShell:

conda create -n flostr python
conda activate flostr

The conda env doesn't have to be called "flostr"; call it whatever.

Requirements

Download the requirements.txt file.

pip install -r requirements.txt
conda install pyamg

ParaView

Install ParaView.

Getting started

Download the scripts:

• cylinder.py
• st08_navier_stokes_cylinder.py
• probe.py
• pod.py

Simulation

Run the simulation:

python st08_navier_stokes_cylinder.py

It takes about five minutes on a modern desktop.

This produces an XDMF solution file containing the mesh (about 1600 nodes) and the nodal velocity and pressure at 5000 time-steps.

• st08_navier_stokes_cylinder.xdmf
• st08_navier_stokes_cylinder.h5

It also calls cylinder.py to create a mesh and store it in cylinder.json. If present, this is reread rather than regenerated.

Postprocessing

These can be inspected with ParaView; just open the .xdmf file while the .h5 file is in the same directory.

paraview st08_navier_stokes_cylinder.xdmf

(Or launch ParaView from the MS-Windows start-bar and open the .xdmf file.)

Choose Xdmf3ReaderS from the list of readers.

Point probe

Download probe.py and run it in the directory containing st08_navier_stokes_cylinder.xdmf.

python probe.py

It should produce st08_navier_stokes_cylinder.png, showing the history of the pressure at the nominal fore and aft stagnation points.

Proper orthogonal decomposition

Download pod.py and run it in the directory containing st08_navier_stokes_cylinder.xdmf.

python pod.py

It should produce pod.xdmf, showing the first half-dozen POD modes. It can be viewed in ParaView, as above.