foamCleanPolyMesh

#!/bin/sh
#------------------------------------------------------------------------------
# =========                 |
# \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox
#  \\    /   O peration     | Website:  https://openfoam.org
#   \\  /    A nd           | Copyright (C) 2011-2018 OpenFOAM Foundation
#    \\/     M anipulation  |
#------------------------------------------------------------------------------
# License
#     This file is part of OpenFOAM.
#
#     OpenFOAM is free software: you can redistribute it and/or modify it
#     under the terms of the GNU General Public License as published by
#     the Free Software Foundation, either version 3 of the License, or
#     (at your option) any later version.
#
#     OpenFOAM is distributed in the hope that it will be useful, but WITHOUT
#     ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
#     FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
#     for more details.
#
#     You should have received a copy of the GNU General Public License
#     along with OpenFOAM.  If not, see <http://www.gnu.org/licenses/>.
#
# Script
#     foamCleanPolyMesh
#
# Description
#    Remove the contents of the constant/polyMesh directory
#    as per the Foam::polyMesh::removeFiles() method.
#
#------------------------------------------------------------------------------
usage() {
    cat <<USAGE

Usage: ${0##*/} [OPTION]
options:
  -case <dir>       specify alternative case directory, default is the cwd
  -region <name>    specify alternative mesh region
  -help             print the usage

Remove the contents of the constant/polyMesh directory as per the
Foam::polyMesh::removeFiles() method.

USAGE
}

error() {
    exec 1>&2
    while [ "$#" -ge 1 ]; do echo "$1"; shift; done
    usage
    exit 1
}

unset caseDir regionName

# Parse a single option
while [ "$#" -gt 0 ]
do
    case "$1" in
    -h | -help)
        usage && exit 0
        ;;
    -case)
        [ "$#" -ge 2 ] || error "'$1' option requires an argument"
        cd "$2" 2>/dev/null || error "directory does not exist:  '$2'"
        caseDir=$2
        shift 2
        ;;
    -region)
        [ "$#" -ge 2 ] || error "'$1' option requires an argument"
        regionName=$2
        shift 2
        ;;
    *)
        error "unknown option/argument: '$*'"
        ;;
    esac
done

if [ -n "$regionName" ]
then
    meshDir=$regionName/polyMesh
else
    meshDir=polyMesh
fi

# If -case was specified: insist upon 'constant/polyMesh'
if [ -n "$caseDir" ]
then
    if [ -d constant/$meshDir ]
    then
        # Use constant/polyMesh
        meshDir=constant/$meshDir
    else
       echo "Error: no 'constant/$meshDir' in $caseDir" 1>&2
       exit 1
    fi
else
    if [ -d constant/$meshDir ]
    then
        # Use constant/polyMesh
        meshDir=constant/$meshDir
    elif [ -d $meshDir ]
    then
        # Likely already in constant/ - do not adjust anything
        :
    elif [ "${PWD##*/}" = polyMesh -a -z "$regionName" ]
    then
        # Apparently already within polyMesh/
        meshDir=.
    fi
fi


# Remove files (mesh itself, modifiers, snappyHexMesh ones) and subdirectories
# also remove .gz versions of the same files
echo "Cleaning ${caseDir:-.}/$meshDir" 1>&2

for i in \
    points \
    faces \
    owner \
    neighbour \
    cells \
    boundary \
    pointZones \
    faceZones \
    cellZones \
    meshModifiers \
    parallelData \
    sets \
    cellLevel \
    pointLevel \
    level0Edge \
    refinementHistory \
    surfaceIndex \
;
do
    rm -rf ${meshDir:?}/$i ${meshDir:?}/$i.gz
done

#------------------------------------------------------------------------------