[rob3rt 0ng]

Hi all,

I'm having a lot of convergence issues when running simpleFoam using the ABL conditions with the wind direction. I've got three different mesh resolutions, all run without the wind direction i.e. flowDirection (1 0 0): the two finer ones (46 and 30m cells) converged, while the coarser mesh (12m cells) didn't. However, when running with the wind direction, for example east north-easterly (60deg), the simulations blew up (using all the three mesh resolutions). I implemented the wind direction by setting the flowDirection to (cos theta, sin 180-theta, 0), and since for this case all the angles are in positive values, I didn't switch inlet surfaces (inlet->outlet, and vice versa).

Could anyone please advise on this? I'm sure this is something quite common, however, I can't seem to find the solution in this forum (maybe I miss or overlook something). Please let me know if you need some output files (e.g. checkMesh, log files, etc).

Kind regards,
Robert