用FreeCAD做刚体和流体的物理仿真

source /etc/profile.d/openfoam-11.sh
ofoam # 这是个加载环境的指令，实际是 source /opt/OpenFOAM/OpenFOAM-11/etc/bashrc
freecad

Checking CFD workbench dependencies...
Checking FreeCAD version
FreeCAD version: 0.21
Checking for OpenFOAM:
System: Linux
Runtime: Posix
OpenFOAM directory: /opt/OpenFOAM/OpenFOAM-11
Running  echo $WM_PROJECT_VERSION
Executing: echo $WM_PROJECT_VERSION
11
OpenFOAM installation found, but unable to run command: 'PySide6.QtCore.QProcess' object has no attribute 'Timedout'

  File "/home/user/.local/share/FreeCAD/Mod/CfdOF/./CfdOF/CfdConsoleProcess.py", line 153, in waitForFinished
    if self.process.error() != self.process.Timedout:
                               ^^^^^^^^^^^^^^^^^^^^^
AttributeError: 'PySide6.QtCore.QProcess' object has no attribute 'Timedout'

# freecad-cfd.nix
{ pkgs ? import <nixpkgs> {} }:
pkgs.mkShell {
    # nativeBuildInputs is usually what you want -- tools you need to run
    nativeBuildInputs = [ pkgs.freecad ];
}

# freecad-cfd.nix
let
  nixpkgs_ball = fetchTarball {
    url = "https://github.com/NixOS/nixpkgs/tarball/nixos-24.05";
    sha256 = "1q7y5ygr805l5axcjhn0rn3wj8zrwbrr0c6a8xd981zh8iccmx0p";
  };
  pkgs = import nixpkgs_ball { config = { allowUnfree = true; }; };
in
pkgs.mkShell {
    # nativeBuildInputs is usually what you want -- tools you need to run
    nativeBuildInputs = [ pkgs.freecad ];
}

# freecad-cfd.nix
let
  nixpkgs_ball = fetchTarball {
    url = "https://github.com/NixOS/nixpkgs/tarball/nixos-24.05";
    sha256 = "1q7y5ygr805l5axcjhn0rn3wj8zrwbrr0c6a8xd981zh8iccmx0p";
  };
  nixgl_ball = fetchTarball {
    url = "https://github.com/nix-community/nixGL/tarball/310f8e49a149e4c9ea52f1adf70cdc768ec53f8a";
    sha256 = "1crnbv3mdx83xjwl2j63rwwl9qfgi2f1lr53zzjlby5lh50xjz4n";
  };
  pkgs = import nixpkgs_ball { config = { allowUnfree = true; }; };
  nixgl = import nixgl_ball {};
in
pkgs.mkShell {
    # nativeBuildInputs is usually what you want -- tools you need to run
    nativeBuildInputs = [
        pkgs.freecad
        nixgl.nixGLIntel # Mesa OpenGL implementation (intel, amd, nouveau, ...).
    ];
    # 看到nixgl仓库有人开issue提到了这个，nix-shell workaround
    shellHook = ''
        export LD_LIBRARY_PATH=$(nixGLIntel printenv LD_LIBRARY_PATH):$LD_LIBRARY_PATH
        '';
}

# 运行后会构建并打开一个shell环境
nix-shell freecad-cfd.nix
# 要让图形系统正常工作，需要套个nixgl
nixGLIntel freecad

# openfoam/default.nix
{ lib, stdenv
, cmake
, boost
, bzip2
, cgal
, fftw
, flex
, openmpi
, paraview
, parmetis
, scotch
, zlib
}:

stdenv.mkDerivation rec {
  pname = "openfoam";
  version = "2312";

  src = fetchTarball {
    url = "https://develop.openfoam.com/Development/openfoam/-/archive/OpenFOAM-v${version}/openfoam-OpenFOAM-v${version}.tar.gz";
  };

  buildInputs = [ boost cgal paraview parmetis scotch openmpi fftw zlib ];
  nativeBuildInputs = [ cmake bzip2 flex ];

  configurePhase = ''
    echo "# Preferences for arch-linux
    export WM_COMPILER_TYPE=system
    export WM_MPLIB=SYSTEMOPENMPI
    # End" \
    > etc/prefs.sh

    ./bin/tools/foamConfigurePaths \
      -adios adios-system \
      -boost boost-system \
      -cgal cgal-system \
      -fftw fftw-system \
      -metis metis-system \
      -paraview paraview-system \
      -scotch scotch-system \
      ;
    '';

  buildPhase = ''
    export FOAM_CONFIG_MODE="o"
    unset FOAM_SETTINGS
    source ./etc/bashrc || echo "Ignore spurious sourcing error"
    ./Allwmake -j
    wclean all
    wmakeLnIncludeAll
    '';

  installPhase = ''
    install -d $out/opt/OpenFOAM/ThirdParty-v${version} $out/etc/profile.d
    cp -r $(pwd) $out/opt/OpenFOAM/OpenFOAM-v${version}
    chmod -R 755 $out/opt/OpenFOAM/OpenFOAM-v${version}/bin
    chmod 755 $out/opt/OpenFOAM/OpenFOAM-v${version}/etc/*

    install -d $out/bin
    echo 'echo $(readlink -f "$(dirname $0)/../opt/OpenFOAM/OpenFOAM-v${version}")' | \
      install -Dm755 /dev/stdin  $out/bin/openfoam-home.sh
    '';

  meta = with lib; {
    description = "The free, open source CFD software developed primarily by OpenCFD Ltd since 2004";
    homepage = "https://www.openfoam.com/";
    license = licenses.gpl3;
    platforms = platforms.all;
  };
}

# freecad-cfd.nix
let
  ...
  openfoam = pkgs.callPackage (import ./openfoam) { };
  ...
in
pkgs.mkShell {
  buildInputs = [
    ...
    openfoam
    ...
  ];
  ...
}

#！ /bin/sh
...

# openfoam/default.nix
configurePhase = ''
  patchShebangs wmake/w*
  patchShebangs wmake/scripts
  patchShebangs Allwmake
  ...
  ''

Prerequisites:
- OpenFOAM Foundation versions 9-10 or ESI-OpenCFD versions 2006-2306

arch4edu/openfoam-com v2312-1
    The open source CFD toolbox (www.openfoam.com)
arch4edu/openfoam-org 11.20240116-1
    The open source CFD toolbox (www.openfoam.org)

# openfoam/default.nix
{...
, version ? "2306"
, hash ? "1z0sna5jxlyfz8s7vi28m47iwjjjbzg9ycz5maz2gymchg7lw6v7"
}:
stdenv.mkDerivation rec {
  pname = "openfoam";
  inherit version;
  foam_hash = hash;
  src = fetchTarball {
    url = "https://develop.openfoam.com/Development/openfoam/-/archive/OpenFOAM-v${version}/openfoam-OpenFOAM-v${version}.tar.gz";
    sha256 = foam_hash;
  };
  ...
}

# freecad-cfd.nix
shellHook = ''
  ...
  source ${openfoam}/opt/OpenFOAM/OpenFOAM-v${openfoam.version}/etc/bashrc || true
  ...
  '';

Decomposing mesh

Create mesh

Calculating distribution of cells
Decomposition method scotch [4] (region region0)
Selecting decompositionConstraint preserveBaffles
preserveBaffles : setting constraints to preserve baffles


--> FOAM FATAL ERROR: (openfoam-2306)
Attempted to use <scotch> without the scotchDecomp library loaded.
This message is from the dummy scotchDecomp stub library instead.

Please install <scotch> and ensure libscotch.so is in LD_LIBRARY_PATH.
The scotchDecomp library can then be built from src/parallel/decompose/scotchDecomp.
Dynamically loading or linking this library will add <scotch> as a decomposition method.


    From virtual Foam::labelList Foam::scotchDecomp::decompose(const Foam::polyMesh&, const Foam::labelList&, const Foam::pointField&, const Foam::scalarField&) const
    in file dummyScotchDecomp.C at line 111.

FOAM exiting

=> skip scotch (no header)

# Search
# $1 : prefix (*_ARCH_PATH, system, ...)
#
# On success, return 0 and export variables
# -> HAVE_SCOTCH, SCOTCH_ARCH_PATH, SCOTCH_INC_DIR, SCOTCH_LIB_DIR
search_scotch() {
  ...
}

# freecad-cfd.nix
configurePhase = ''
  ...
  ./bin/tools/foamConfigurePaths \
    -boost-path ${boost} \
    -cgal-path ${cgal} \
    -fftw-path ${fftw} \
    -metis-path ${parmetis} \
    -paraview-path ${paraview} \
    -scotch-path ${scotch} \
    ;
  '';

include/CGAL/type_traits.h:34:20: error: 'remove_cv_t' in namespace 'std' does not name a template type; did you mean 'remove_cv'?
   34 |       typedef std::remove_cv_t<std::remove_reference_t<T>> type;
      |                    ^~~~~~~~~~~
      |                    remove_cv
include/CGAL/Rational_traits.h:83:56: error: 'std::enable_if_t' has not been declared
   83 |     Rational make_rational(const N& n, const D& d,std::enable_if_t<is_implicit_convertible<N,RT>::value&&is_implicit_convertible<D,RT>::value,int> = 0) const
      |
include/CGAL/Rational_traits.h:83:67: error: expected ',' or '...' before '<' token
   83 |     Rational make_rational(const N& n, const D& d,std::enable_if_t<is_implicit_convertible<N,RT>::value&&is_implicit_convertible<D,RT>::value,int> = 0) const
      |

# openfoam/default.nix
...
stdenv.mkDerivation rec {
  ...
  # 没错我连paraview也一起带上了
  propagatedBuildInputs = [ openmpi paraview ];
  ...
}

buildInputs = [ openfoam ] ++ openfoam.buildInputs;

# In both cases, the zip is automatically extracted
src = 
  if (version == "bundled") then
    ./cfmesh-cfdof.zip
  else
    fetchzip {
      url = "https://sourceforge.net/projects/cfmesh-cfdof/files/cfmesh-cfdof.zip/download";
    }
  ;

shellHook = ''
    ...
    export FREECAD_USER_HOME=$(pwd)/freecad-state/home
    export FREECAD_USER_DATA=$(pwd)/freecad-state/userdata
    export FREECAD_USER_TEMP=$(pwd)/freecad-state/temp
    ...
    '';

> paraview --version
Gtk-Message: 16:27:34.014: Failed to load module "canberra-gtk-module"
Gtk-Message: 16:27:34.015: Failed to load module "canberra-gtk-module"
paraview version 5.11.2
> paraview --version 2>/dev/null
paraview version 5.11.2

--- a/CfdOF/CfdTools.py
+++ b/CfdOF/CfdTools.py
@@ -1178,7 +1178,7 @@ def checkCfdDependencies(msgFn):
             proc.setProcessEnvironment(env)
             proc.start()
             if proc.waitForFinished():
-                pvversion = proc.readAllStandardOutput() + proc.readAllStandardError()
+                pvversion = proc.readAllStandardOutput()
                 pvversion = QTextStream(pvversion).readAll().split()
                 # The --version flag doesn't seem to work on Winodws, so quietly ignore if nothing returned
                 if len(pvversion):

{ pkgs }:
let
  openfoam-2306 = pkgs.callPackage (import ./openfoam) { };
  openfoam-2312 = openfoam-2306.override { version = "2312"; hash = "0wgfyz4q7xr0vlv4znfxpxyp8jb53q5pl17k312dyb3x8gkdx2z4"; };
  cfmesh-cfdof = pkgs.callPackage (import ./cfmesh-cfdof) { openfoam = openfoam-2306; };
  hisa = pkgs.callPackage (import ./hisa) { openfoam = openfoam-2306; };
  cfmesh-cfdof-unstable = cfmesh-cfdof.override { version = "unstable"; };
  hisa-unstable = hisa.override { version = "unstable"; };
in {
  inherit openfoam-2306 openfoam-2312;
  inherit cfmesh-cfdof hisa;
  inherit cfmesh-cfdof-unstable hisa-unstable;
}

        // first check the environment paths by QFileInfo
        if (QFileInfo::exists(QString::fromLatin1(binaryName.c_str()))) {
            return binaryName;
        }

// main.cpp
#include <QFileInfo>
#include <QStandardPaths>
#include <QString>
#include <iostream>

int main(int argc, char* argv[]) {
  if (argc != 2) {
    std::cerr << "Usage: " << argv[0] << " <path to executable>" << std::endl;
    return 1;
  }
  QString executableName(argv[1]);
  QString executablePath = QStandardPaths::findExecutable(executableName);
  QFileInfo fileInfo(executablePath);
  if ( fileInfo.exists() && fileInfo.isExecutable()) {
    std::cout << "The binary exists and is executable." << std::endl;
    std::cout << "Binary location: " << executablePath.toStdString() << std::endl;
    std::cout << "FreeCAD's code test result: ";
    if (QFileInfo::exists(executableName))
      std::cout << "found" << std::endl;
    else
      std::cout << "not found" << std::endl;
  } else {
    std::cout << "The binary does not exist or is not executable." << std::endl;
  }
  return 0;
}

# some bug hotfix, only for freecad 0.21.2
freecad-patched = pkgs.freecad.overrideAttrs (finalAttrs: previousAttrs: {
    patches = previousAttrs.patches ++ [ 
        ./patches/0001-Fem-fix-searching-3rd-party-binaries-in-system-path.patch
    ]; 
});

Caught signal 8 (Floating point exception: tkill(2) or tgkill(2))