which file should I modified in order to improve the explicit Euler method?
 

Dear FOAMers,

I studied a paper which is applying RK4 and ARK3 to improve the explicit Euler method.
The paper provide the implementation, but I don't know which file should I modify to make that happened.

p.s. since the paper is too big to upload, I just give the information below.
<On the implementation of low-dissipative Runge–Kutta projection
methods for time dependent flows using OpenFOAM> by V. Vuorinen, J.-P. Keskinen, C. Duwig, B.J. Boersma.
You can find the paper in http://www.sciencedirect.com/science...45793014000334

Could anyone give me a hint? Your help is greatly appreciated.

Chun