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Hello,

According to the usage description of the actuationDiskSource, diskDir is Surface-normal vector of the actuator disk pointing upstream. This contradicts the turbineSiting tutorial where diskDir is pointing (1 0 0) which the same direction as the flow (downstream). In order to double check, I ran the tutorial four times using the two available force models with diskDir (1 0 0) (downstream) and diskDir (-1 0 0) (upstream). The attached figure shows the results along horizontal line through the centre of the disk1. It clear from the pressure that downstream is the right direction. This has been done using OpenFOAM-v2006.

Anther point which sounds confusing is this comment

        //- Flag for body forces to act as a source (true) or a sink (false)
        label sink_;

From what I see in the code and OF sign convention as far as I understand, true sink_ leads to positive term which acts as sink (momentum extraction) and vice versa. Hence, the comment isn't accurate unless I'm missing something here.

Thanks for your effort and continues support,

Best wishes, Hassan