[bruce21]

I am trying to implement a moving actuator disk for graduation thesis. I have attached a figure of the actuator disk cellSet below. What I want to achieve now is, an uniform momentum source irrespective of the cell thickness/volume. When I tried imposing a constant value of thrust to the cells (by changing the OpenFOAM prebuilt utility 'actuationDiskSource'), I observed that the momentum imparted to the flow by thicker cells is higher than the thinner ones. I have attached the velocity plot along the actuator disk both upstream and downstream. There you will be able to observe the change in momentum imparted (the velocity profile will have a slope rather than being flat). However, I am not sure why that is happening. I need help finding that out.

I noticed that the variable 'Usource' is the momentum source term that gets passed on to Ueqn, but unable to figure out what exactly it does to the momentum equation. Can anyone indicate how I can find the way 'Usource' is introduced to the momentum equation? I will attach a screenshot of the code snippet from the modified 'actuationDiskSource' utility.