Simplified main sequence stellar fusion and evolution model, WIP. At this point it is more conceptual-visualizatory rather than actual-universe-realism-y, not to mention I spent hours finetuning my universal constants rather than taking the numbers from real stars.
KOHIEN2 stands for Kozmik Hidrodinamik-Enerji Modeli, which is Turkish for Cosmic Hydrodynamic-Energy Model, and 2 is because this version is 2D.