strange observations: 2

kenn

Hi, I wrote a small 2-D code using projection finite difference on staggered mesh for a N-S problem in a periodic square--means a square with periodic BC and periodic body force. I wrote the first version three years ago in Matlab and based on classnotes which were carefully examined by the intructor, classmates and me. now,I wrote a C++ version almost independent from the previous version but based on the same trustable formulation.

as we know, when delaing with a high Re, upwinding or something like is needed unless mesh resolution is resolved.

however, I use forward time and central difference and very course mesh for any Re situations, and I didn't observe what people claim(and I also believe). instead, both version of codes always give me at least qualitative convincing results.

I am pretty puzzled, does anyone want to shed a light?