[Bylund]

Hello,

A question from an inexperienced OpenFOAM user.

I am playing around with a simple manifold design and icoFoam.

After 10 time steps everything looks more or less ok, but then suddenly the velocity increases to unreasonable values.

I increased the resolution of the mesh with unchanged results.

I have this problem generally with icoFoam that U increases until icoFoam crashes with a floating point error.

I understand I am doing something wrong, so if someone could point me in the right direction I would appreciate it.

Thank you.

[Bylund]

I think I found the reason for this problem.

After decreasing deltaT from 0.1 to 0.005 it seems to work good.

Could be useful for anyone else who stumbles upon this problem.

[alberto]

Hint: Check that the Courant number is < 1. If you need large time-steps, use pimpleFoam.