[arka14]

I have been trying to simulate flow through a diverging channel with angle of divergence 20 degrees in OpenFoam. The boundary conditions worked well for lesser Reynold's Number but failed when the Reynold's number were increased to 1000. The error being shown is nan (not a number). The boundary conditions were also working fine when I worked with angle of divergence 10 degrees in case of Reynold's number 1000.
The boundary conditions which I had initially provided are:
Inlet:- U- fixedValue p- zeroGradient
Outlet:- U-zeroGradient p- fixedValue (zero)
Can anyone suggest what should be the ideal boundary conditions to run the simulations?