[jmmichie]

Hi all,

I'm studying the crosswind stability of the M6-train. For flow angles till 30 degrees (compared to train's heading direction) the lift stays more or less steady. For higher angles the lift coefficients starts oscillating (not in a periodic manner) from -3 to 0 (positive lift pushes the train downwards in my case).

Is this due to possible vortex shedding on the train? And if I should run an unsteady case, won't the lift be oscillations over different iterations during one timestep?

The other moments and drag coefficients stay more or less constant.

A figure of the lift coefficient over different itterations is shown in the attachment. (The coefficient was found to be 2.8 in experiments)

Thanks in advance

http://www.mijnalbum.nl/index.php?m=upload&a=20