freefoam-coalChemistry: command not found

Have You tried accessing the binary with the full path?

Maybe Your $PATH variable doesn't contain the default paths? echo $PATH should give something like:

[root@server ~]# echo $PATH

If it's empty, You may set the PATH variable with this command

export PATH="/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/root/bin"

On Debian possible default full paths are:

/usr/bin/freefoam-coalChemistry - from package: freefoam

You may install the required package with command apt-get install {package}
Error in other languages:
freefoam-coalChemistry: bevel nie gevind nie
freefoam-coalChemistry: comandă negăsită
freefoam-coalChemistry: comando não encontrado
freefoam-coalChemistry: commande introuvable
freefoam-coalChemistry: command not found
freefoam-coalChemistry: käsku ei ole
freefoam-coalChemistry: không tìm thấy lệnh
freefoam-coalChemistry: komanda nerasta
freefoam-coalChemistry: Kommando nicht gefunden.
freefoam-coalChemistry: kommandot finns inte
freefoam-coalChemistry: komut yok
freefoam-coalChemistry: nie znaleziono polecenia
freefoam-coalChemistry: níor aimsíodh an t-ordú
freefoam-coalChemistry: no se encontró la orden
freefoam-coalChemistry: no s'ha trobat l'ordre
freefoam-coalChemistry: opdracht niet gevonden
freefoam-coalChemistry: parancs nem található
freefoam-coalChemistry: perintah tidak ditemukan
freefoam-coalChemistry: príkaz nenájdený
freefoam-coalChemistry: příkaz nenalezen
freefoam-coalChemistry: команда не найдена
freefoam-coalChemistry: командата не е открита
freefoam-coalChemistry: 命令找不到
freefoam-coalChemistry: コマンドが見つかりません