Question on Diesel Engines

Adrin Gharakhani

This question is for users (and developers) of commercial codes for engine flow simulation.

For a _practical_ diesel engine flow simulation with combustion (or any other engine if you care to comment), what assumptions are you willing to tolerate (and what assumptions are used in the code you use)?

Specifically, will the following equations be acceptable (which include quite a few assumptions) If not, then why not?

Mass:

Dr/Dt + r(Del.u) = 0 (r=density)

Assume anelastic flow of a thermally perfect gas:

Dr/Dt = -r Beta DT/Dt (Beta=isothermal compressibility)

Momentum:

rDu/Dt = -Del(p) + mu[ Del^2(u) ] (constant viscosity mu)

Energy:

(r.c_p)DT/Dt = Del.[ Lam Del(T) ] + Thet

Lam = conductivity Thet = source term corresponding to the rate of generation of energy per unit volume

Reaction:

Shvab-Zel'dovich with all its corresponding assumptions - Arrhenius type, fast single step reaction

Thanks in advance

Adrin Gharakhani