CFD Streamline

How to enable Windows Subsystem Linux (WSL) and install Ubuntu

2022-04-21T00:00:00+02:00

Search for “Turn Windows features on or off” in the Start Menu Search.
On the screen that will pop-up, check the box for “Windows Subsystem for Linux”
Restart de computer.
Download and install Ubuntu WSL from the Microsoft Store Ubuntu in Microsoft Store

Wikihow

Cool tools in Linux command line

2022-04-21T00:00:00+02:00

neofetch

https://github.com/dylanaraps/neofetch

cpufetch

https://github.com/Dr-Noob/cpufetch

cmatrix

https://github.com/abishekvashok/cmatrix

bpytop

https://github.com/aristocratos/bpytop

lsd

https://github.com/Peltoche/lsd

ncdu

https://dev.yorhel.nl/ncdu

gdu

https://github.com/dundee/gdu

bat

https://github.com/sharkdp/bat

ascii-image-converter

https://github.com/TheZoraiz/ascii-image-converter

ranger

https://ranger.github.io/

speedtest-cli

https://github.com/sivel/speedtest-cli

How to convert webp files to jpg, to png or to other image formats

2022-01-04T00:00:00+01:00

Linux

Debian-based (Debian, Ubuntu, Mint, etc…)

sudo apt-get install webp

dwebp file.webp -o file.jpg
dwebp file.webp -o file.png

RPM-based (Red Hat Linux, CentOS, Fedora, openSuse, Mandrake Linux)

sudo yum install libwebp libwebp-tools

dwebp file.webp -o file.jpg
dwebp file.webp -o file.png

Windows

Download dwebp decoder tool from https://developers.google.com/speed/webp/download.
Unzip the package and inside the bin folder you will find the executables. Run the executable file and follows the steps.

Run:

dwebp.exe file.webp -o file.jpg
dwebp.exe file.webp -o file.png

macOS

Install webp using Homebrew:

 brew install webp

 dwebp file.webp -o file.jpg
 dwebp file.webp -o file.png

How to use OpenFOAM

2021-12-28T00:00:00+01:00

References

CFD with Open Source Software - Chalmers University

Introduction

Meshing

Test Cases

How to install MPICH

2021-12-27T00:00:00+01:00

Requirements

A copy of the distribution, mpich.tar.gz. Download the latest stable version of mpich from: https://www.mpich.org/downloads/
A C compiler. See how to install gcc.
A Fortran-77, Fortran-90, and/or C++ compiler if you wish to write MPI programs in any of these languages. See how to install gfortran.

Directions

Linux and macOS

Make sure you are using bash.
```
 echo $SHELL
```
If it is not bash, command: bash
Create a folder for mpich
```
 mkdir /home/you/mpich
```
Unpack mpich-x-y-z.tar.gz to that folder, where x-y-z is the version
```
 tar xfz mpich-x-y-z.tar.gz
```

Create 2 other folders

 mkdir /home/you/mpich/build
 mkdir /home/you/mpich/mpich-install

Enter the build directory and run the configuration script. It is important to write the full path in the prefix argument.

 cd /home/you/mpich/build
 ../mpich-x-y-z/configure --with-device=ch4:ofi -prefix=/home/you/mpich/mpich-install 2>&1 | tee c.txt

Build mpich. Run command and go for a coffee:
```
 make 2>&1 | tee m.txt
```
Install MPICH.
```
 make install 2>&1 | tee mi.txt	
```
Add the bin subdirectory of the installation directory to your path:
```
 export PATH=/home/you/mpich/mpich-install/bin:$PATH
```
Check if the installation went well:
```
 which mpicc
 which mpiexec
```
Test mpi in your machine by using the example file that the building process creates. That simple program computes the value of PI. While still inside the build folder, command:
```
mpiexe -n NC ./examples/cpi
```
where NC is the number of cores of your machine.

Learn more

Windows

You should install Microsoft MPI instead. See how to install Microsoft MPI.

How to install Python3

2021-12-27T00:00:00+01:00

Linux

Debian-based (Debian, Ubuntu, Mint, etc…)

sudo apt-get update
sudo apt-get install python3.6

RPM-based (Red Hat Linux, CentOS, Fedora, openSuse, Mandrake Linux)

sudo dnf update
sudo dnf install python3

Windows

Download lastest version of Python from https://www.python.org/downloads/.
Run the executable file and follow the steps.

macOS

Install Python using Homebrew:
```
 brew install python
```

How to install mpi4py

2021-12-27T00:00:00+01:00

MPI for Python enables MPI usage for the Python language, allowing programmers to write codes that leverage multiple processor computing systems.

Linux and macOS

In a bash terminal, sudo your user:
```
sudo su
```
Make sure you have Python 3 developer installed:
- Debian-based (Debian, Ubuntu, Mint, etc…)
```
 sudo apt-get install python-devel
```
- RPM-based (Red Hat Linux, CentOS, Fedora, openSuse, Mandrake Linux)
```
 sudo yum install python-devel
```
If you don’t have pip installed, install it with:
```
easy_install pip
```
Add the bin subdirectory of the MPICH installation directory to your path:
```
 export PATH=/home/you/mpich/mpich-install/bin:$PATH
```
See how to install MPICH.
Finally, install mpi4py.
```
pip3 install mpi4py
```

Windows

Go to the Scripts folder inside your Python installation directory:
```
  cd C:\PythonXX\Scripts\
```
Run pip as follows:
```
  pip.exe install mpi4py
```

macOS

Install using Homebrew
```
brew install mpi4py
```

How to install SU2 in MPI mode

2021-12-27T00:00:00+01:00

Pre-requisite

Python3. See how to install Python3
- It is necessary to install numpy and scipy if you are going to use more advanced features from SU2, like optimization. Matplotlib is very handy for post-processing CFD. See how to install common Python3 packages for scientific computating
- For Windows use Python3.7 or newer. (download here or from the Microsoft Store)
Swig. See how to install swig
For Windows, MinGW-w64 version 8.1.0 download here. See how to install MinGW
Install a MPI implementation.
- For Linux and macOS, use MPICH
- For Windows use Microsoft MPI v10.1.2 or newer. See how to install
Install MPI for Python (mpi4py)
It is not needed to install Meson, Ninja, CoDiPack and MeDiPack beforehand. SU2 installation process does that for you and ensures the correct versions.

Directions

Installation

Installing from binaries

Download the zipped package containing the binary executables from https://su2code.github.io/download.html
Unzip the package in a directory of your preference. It is a good idea to avoid spaces in the address.

Installing from source files

Linux and macOS

Make sure you are using bash.

 echo $SHELL
 # if it is not bash, command: bash

Create a folder for SU2
```
 mkdir /home/you/su2
```
Download to that folder the latest stable source code version of SU2 from: https://su2code.github.io/download.html
Unzip the file
```
 unzip su2code...zip
```
Create a build folder
```
 mkdir /home/you/su2/build
```
Enter the unziped su2 source code folder and run mason, giving the full address of the build folder above in the prefix argument:
```
 cd /home/you/su2/su2code...
 ./meson.py build -Denable-autodiff=true --prefix=/home/you/su2/build
```
Compile with ninja
```
 ./ninja -C build install
```

Windows

It works for Windows 10 and it is expected to work for newer versions as well.

Download SU2 v7.x.x download here
Install Microsoft MPI by simply executing the installers msmpisetup.exe and the msmpisdk.msi.
Install MinGW by executing the installer mingw-w64-install.exe. Choose Version 8.1.0 and Architecture x86_64 on the Settings page. Everything else can stay on their default values. On the next page set a destination folder and remember it! Click next until everything has been downloaded and installed.
In the file browser go to the mingw installation directory and execute the file mingw-w64. This should open the command prompt. Navigate to the SU2 source code directory.
Create a build folder.
```
 mkdir build
```
Enter the unziped su2 source code folder and run mason, giving the full address of the build folder above in the prefix argument:
```
 python meson.py build -Denable-autodiff=true --prefix=/home/you/su2/build
```
Compile with ninja
```
 ninja.exe -C build install
```

Setting Environment variables

In order to use the executables from any directory without explicitly specifying the path to the executable you should set some environment variables.

Linux and macOS

Either add the following lines to your ~/.bashrc or ~/.bash_profile to be permanent, or type the commands into the terminal for temporary use. Assuming that is the path to the SU2 binaries (i.e. the folder that contains SU2_CFD etc. If you have built SU2 from source, it will be the path that you specified with the --prefix option):

export SU2_RUN=<install_path>
export PATH=$SU2_RUN:$PATH
export PYTHONPATH=$SU2_RUN:$PYTHONPATH

The export commands are also printed after a successful configuration using meson.py.

Windows

Search for “Environment Variables” in Windows Search. At the bottom “System Variables” panel, add to the “Path” variable: .

Learn more

Install on Windows

How to install swig

2021-12-27T00:00:00+01:00

Swig is the abbreviation of Simplified Wrapper and Interface Generator, it can give script language such as python the ability to invoke C and C++ libraries interface method indirectly.

Linux

Debian-based (Debian, Ubuntu, Mint, etc…)

sudo apt-get update
sudo apt-get swig

RPM-based (Red Hat Linux, CentOS, Fedora, openSuse, Mandrake Linux)

sudo yum update
sudo yum install swig

Windows

Download SWIG from http://www.swig.org/download.html.
Unzip the downloaded pack.
Run swig.exe file and follow the steps.

macOS

In the command line, type:

 brew update
 brew upgrade
 brew install swig
 brew cleanup

How to install Microsoft MPI

2021-12-27T00:00:00+01:00

Requirements

Windows 7 or newer.

Directions

Linux and macOS

You should install MPICH instead. See how to install MPICH.

Windows

Download Microsoft MPI v10.1.2 or newer (download here)
Run MSMpiSetup.exe or msmpisdk.msi, and follow instructions.