[Madact]

Just found a 1D research simulation code which is open source: https://code.google.com/p/icesym/

Paper which I believe refers to the experimental validation of this code: E. J. Lopez and N. M. Nigro,
"Validation of a 0D/1D computational code for the design of several kind of internal combustion engines"
and another paper using this in a 3D / 1D coupled simulation:
Ezequiel J. Lopez, Norberto M. Nigro, "Computational simulation of in-cylinder flows in internal combustion engines by means of the coupling of zero-/one-dimensional and multidimensional codes"

Will have to see if I can get this up and running.