[pwayne]

Hello,

I'm going crazy trying to figure out how to program a 1/7th power law velocity profile (FD) for my inlet on simple duct flow in Star-CCM+. I have very little experience in programming in general and even less experience in field functions, so I really don't know what to do. I tried going off of something in the "Help" section:

[(($$Position[1] <= 0.0025) ?
1.0752*1.143*pow(($$Position[1]/0.0025),0.143) :
1.0752*1.143*pow(((0.005-$$Position[1])/0.0025),0.143)), 0, 0]

Basically, it's u(y) = u_bar*(y/delta)^(1/7) for y <= 0.0025 m. and u(y) = u_bar*((h-y)/delta)^(1/7) for y > 0.0025 m. I know this is wrong because my simulation won't run with this. Can anyone help me?

Thanks,
P. Wayne

p.s. The entire height of the duct is only 5 mm.....just in case you were wondering