#!/bin/sh
#------------------------------------------------------------------------------
# =========                 |
# \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox
#  \\    /   O peration     |
#   \\  /    A nd           | www.openfoam.com
#    \\/     M anipulation  |
#------------------------------------------------------------------------------
#     Copyright (C) 2017-2021 OpenCFD Ltd.
#------------------------------------------------------------------------------
# License
#     This file is part of OpenFOAM, distributed under GPL-3.0-or-later.
#
# Script
#     plot
#
# Description
#     Creates .png graph of OpenFOAM results vs analytical solution for the
#     Joule heating case
#
#------------------------------------------------------------------------------
cd "${0%/*}" || exit                                # Run from this directory
#------------------------------------------------------------------------------

# settings

    # stop on first error
    set -e


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

plot_x_vs_T()
{
    sampleFile="$1"
    image="x_vs_T.png"

    gnuplot<<EOF
    set terminal pngcairo font "helvetica,20" size 1000, 1000
    set grid
    set key left top
    set xlabel "Length, x / [m]"
    set ylabel "Temperature / [K]"
    set output "$image"

    # Benchmark - Analytical
        rho = 7.837e-6
        sigma = 1/rho
        kappa = 200
        L = 2.5
        D = 0.1
        H = 0.1
        vol = 2.0*L*D*H
        V = 1.5
        R = rho*2*L/(D*H)
        I = V/R
        P = I*V
        Q = P/vol
        Ts = 500
        T(x) = Q*L*L/(2*kappa)*(1-(x/L)*(x/L)) + Ts

    # OpenFOAM
        samples="$sampleFile"

    plot \
        samples u 1:2 t "OpenFOAM" w l, \
        T(x) t "Analytical" w linespoints lt 0 pt 6 pi 15
EOF
}


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

# Requires "gnuplot"
command -v gnuplot >/dev/null || {
    echo "FOAM FATAL ERROR: gnuplot not found - skipping graph creation" 1>&2
    exit 1
}

OFDATA='postProcessing/sample1/solid/20000/centreLine_T_jouleHeatingSource:V_jouleHeatingSource:sigma.xy'

[ -f "$OFDATA" ] || {
    echo "FOAM FATAL ERROR: OpenFOAM results not available in $OFDATA" 1>&2
    exit 1
}


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

echo ""
echo "# Plot:"
echo ""

plot_x_vs_T "$OFDATA"

echo "End"


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