mia-3dfluid: 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/mia-3dfluid - from package: mia-tools

You may install the required package with command apt-get install {package}
Error in other languages:
mia-3dfluid: bevel nie gevind nie
mia-3dfluid: comandă negăsită
mia-3dfluid: comando não encontrado
mia-3dfluid: commande introuvable
mia-3dfluid: command not found
mia-3dfluid: käsku ei ole
mia-3dfluid: không tìm thấy lệnh
mia-3dfluid: komanda nerasta
mia-3dfluid: Kommando nicht gefunden.
mia-3dfluid: kommandot finns inte
mia-3dfluid: komut yok
mia-3dfluid: nie znaleziono polecenia
mia-3dfluid: níor aimsíodh an t-ordú
mia-3dfluid: no se encontró la orden
mia-3dfluid: no s'ha trobat l'ordre
mia-3dfluid: opdracht niet gevonden
mia-3dfluid: parancs nem található
mia-3dfluid: perintah tidak ditemukan
mia-3dfluid: príkaz nenájdený
mia-3dfluid: příkaz nenalezen
mia-3dfluid: команда не найдена
mia-3dfluid: командата не е открита
mia-3dfluid: 命令找不到
mia-3dfluid: コマンドが見つかりません