robinknowles

# Start from the official Ubuntu Bionic (18.04 LTS) image
FROM ubuntu:bionic

# Install any extra things we might need
RUN apt-get update \
	&& apt-get install -y \
		vim \
		ssh \
		sudo \
		wget \

robinknowles

// OpenFOAM v2112 function using sampledSurfaces for patch/surface export
// Includes:
//  - multiple file formats;
//  - point-data export;
//  - near-wall interpolation;
//
// Can be tested on motorBike tutorial data, using:
// postProcess -func sample -latestTime

sample

robinknowles

/*--------------------------------*- C++ -*----------------------------------*\
| =========                 |                                                 |
| \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox           |
|  \\    /   O peration     | Version:  v2206                                 |
|   \\  /    A nd           | Website:  www.openfoam.com                      |
|    \\/     M anipulation  |                                                 |
\*---------------------------------------------------------------------------*/

// Calculate lift force coefficient acting on the motorbike patch group
// Then "bin" that data along the X & Y axes to create a force x-ray

robinknowles

How to rename a patch in OpenFOAM using createPatch

Accompanies OnCFD Newsletter #144: How to change a patch name

Outline

Need to rename a patch in a meshed & decomposed case? Do the following...

• Copy the dictionary below & save it as /system/createPatchDict
• Edit the name & patches entries to the required names
• Run createPatch -overwrite in parallel to make the change

robinknowles

Divergence detection in OpenFOAM using runTimeControls

Accompanies OnCFD Newsletter #148: "Divergence Detector"

Here's the copy-paste-able version of the function I use to detect (& end) simulations that are slowly diverging & taking up valuable cluster time.

minMaxU
{
    type        fieldMinMax;

robinknowles

# state file generated using paraview version 5.11.1
import paraview
paraview.compatibility.major = 5
paraview.compatibility.minor = 11

#### import the simple module from the paraview
from paraview.simple import *
#### disable automatic camera reset on 'Show'
paraview.simple._DisableFirstRenderCameraReset()

robinknowles

Run Receipts in ParaView

Accompanies OnCFD Newsletter #158

Attached is an example ParaView script to create a "run receipt" summary of your results like this 👇

Straight from the command-line & ready to post into Slack/Teams/WhatsApp

robinknowles

Detecting AWS spot instance interruptions in OpenFOAM

Accompanies OnCFD Newsletter #165

Here's a quick OpenFOAM function that makes running on AWS spot instances a whole lot nicer.

It uses two standard function objects (plus curl) to check whether your instance has recieved a termination notice.

If it has, it stops your simulation & writes your current data.

robinknowles

Running OpenFOAM with VS Code Tasks

Accompanies OnCFD Newsletter #171

Attached is an example tasks.json file for running your Allrun & Allclean OpenFOAM scripts in VS Code via Tasks.

In VS Code, use cmd/ctrl + shift + p to bring up the command palette & type Tasks: Open User Tasks

Choose the Others option & it will create a tasks.json file in your user area & pop it open in the editor.

robinknowles

Fuzzy finding 'FOAM features

Accompanies OnCFD Newsletter #173

A couple of code snippets that use fzf to mine your install & extract the answers to everyday OpenFOAM questions, like...

• How do I use a particular feature?
• What does so-and-so dictionary look like?
• Does this need a semi-colon? 🤦‍♂️