Fluid2d 流体动力学软件

Fluid2d

Fluid2d是通用的Python-Fortran CFD代码包，它包含了大量的二维流体方程。该软件对于学生学习流体力学或地球物理流体动力学很有帮助，也可以是授课老师的教学实践工具。 其思想是在计算流时可视化动态流，且参数变化的影响可以立即看到。 二维流体的关键量是涡度，如果你的涡度动力学很弱，这个代码是为你准备的。 你应该迅速成为专家一样的专家。由于动画的强大功能，用户可以了解基本流体性质，进一步超越教科书而触及学术研究的问题是很容易的。

有几个功能特别好：

• 代码可处理许多不同的方程组:transport, Euler, quasi-geostrophic, Boussinesq, thermal wind equations。
• 代码处理一个允许具有复杂几何形状的掩模系统(具有任意形状的封闭域)
• 代码往往具有非常低的dissipation水平
• 允许研究边界层问题的no-slip条件
• 代码是并行的，如果需要高分辨率，可以在集群上运行。

下载和安装

软件主页：http://pagesperso.univ-brest.fr/~roullet/fluid2d/index.html
最新版下载地址：https://github.com/pvthinker/Fluid2d

安装步骤：

作者提供了一个快速编译和安装脚本install.sh：

#!/bin/bash

pydir=$HOME/.fluid2d
default=core/defaults.json
srcdir=`pwd`
myexpdir=$srcdir/myexp

echo "--------------------------------------------------------------------------------"
echo ""
echo " Installing Fluid2d"
echo ""
echo "It is recommended to create a virtual environnement. "
echo "If you are using anaconda then you may create the 'pyrsw' environment with"
echo ""
echo "> conda env create -f environment.yml"
echo ""
echo "then whenever you want to use Fluid2d, switch to this environement with"
echo ""
echo "> conda activate fluid2d"
echo ""
echo "Are you ok with you environment? (y/n)"
if [ $ok = "n" ]; then
   exit 42
fi

if [ ! -d "$pydir" ]; then
    echo "  Create $pydir"
    mkdir $pydir
fi
if [ ! -f "$pydir/$default" ]; then
    echo "  Copy $default in $pydir"
    cp $default $pydir/
fi
if [ ! -d "$myexpdir" ]; then
    echo "  Create $myexpdir"
    mkdir $myexpdir
fi
echo "  Copy reference experiments in $myexpdir"
cp -pR $srcdir/experiments/* $myexpdir

# for bash users
cat > $pydir/activate.sh << EOF
export PYTHONPATH=`pwd`/core
echo Python now knows that Fluid2d is in `pwd`
EOF

# for csh, tcsh users
cat > $pydir/activate.csh << EOF
setenv PYTHONPATH `pwd`/core
echo Python now knows that Fluid2d is in `pwd`
EOF

# for fish users
cat > $pydir/activate.fish << EOF
set -gx PYTHONPATH `(pwd)`/core
echo Python now knows that Fluid2d is in `(pwd)`
EOF

# compile the modules with module
echo "--------------------------------------------------------------------------------"
echo ""
echo " Compile modules with f2py"
echo ""
{
    # try
    make
    
} || {
    #catch
    echo "Unable to compile"
    echo "Are you sure f2py is installed?"
    exit
}

# copy the experiment into

echo ""
echo "  Before starting, please read this note carefully"
echo ""
echo "  As it configured, Fluid2d will store the results in"
echo ""
echo "      *** $HOME/data/fluid2d ***"
echo ""
echo "  If you don't run the code from your laptop then it is likely that"
echo "  you are not allowed to store large binary files on $HOME/data"
echo "  because this is your home."
echo ""
echo "  In this case, edit $HOME/.fluid2d/defaults.json"
echo "  and set 'datadir' default value (in the output section) to a"
echo "  place where you are authorized to store large binary files."
echo "  In the jargon, this place is usually a 'work' directory."
echo ""
echo "  If you are unsure where to store your results check that"
echo "  with your system administrator."
echo ""
echo "  Once you know where to store the results, then you're good to go"
echo ""
echo "  Each time you open a new terminal you need to"
echo "     source ~/.fluid2d/activate.sh  if you're under bash"
echo "     source ~/.fluid2d/activate.csh  if you're under csh/tcsh"
echo "     source ~/.fluid2d/activate.fish  if you're under fish"
echo ""
echo "  To run your first experiment"
echo "      cd $myexpdir/Vortex"
echo "      python3 vortex.py"
echo ""
echo "  Write your new experiments in $myexpdir"
echo "  or wherever you want, but not in $srcdir/experiments !"
echo ""

测试

运行之前需要在主目录下新建文件夹：

mkdir data
cd data 
mkdir fluid2d

执行例子：

cd myexp/ShearInstab
python3 shear_instability.py

结果输出：