Intro Task: Added Mass and Buoyancy in Actuator Cylinder Model

[kevmoor]

Here is the intro task: copy added mass and buoyancy equations/logic from the double multiple streamtube model to the actuator cylinder model.

Successful completion will require:

• Basic plots comparing the DMS and AC models’ added mass and buoyancy impacts using the existing RM2 plotting script
• A pull request against OWENSAero
• A list of recommended improvements to OWENS or its docs based on completing this task

Recommended workflow:

1. Copy the added mass and buoyancy equations/logic from the DMS model to the AC model. This is <20 lines of addition/modification.

• Specifically, the streamtube() function of DMS.jl has the needed additions https://github.com/sandialabs/OWENSAero.jl/blob/master/src/DMS.jl
• These additions will go in the radialforce() function in acmultiple.jl https://github.com/sandialabs/OWENSAero.jl/blob/master/src/vawt-ac/src/acmultiple.jl.
• All of the i/o architecture “should” already be there for the AC radialforce() function so it should be nearly copy paste from the DMS model.
• This is the paper that the simple added mass equations came from https://www.sciencedirect.com/science/article/pii/S0960148118304312

2. Install OWENS https://sandialabs.github.io/OWENS.jl/dev/installation/

• There is also a short setup and demo video for OWENS in the readme https://github.com/sandialabs/OWENS.jl.
• Please use mac/linux if you can. If you are trying to install on Windows, don’t try to build the openfast wrappers at this point.
• If you run into issues, we’ll do a quick working meeting.

3. Run the RM2_medium.jl (https://github.com/sandialabs/OWENSAero.jl/blob/master/examples/RM2/RM2_medium.jl) and update to compare the current “DMS” model to the “AC” model with added mass and buoyancy.

   • There is a flag currently on “DMS” that you’d just need to change to “AC” at the minimum

4. Create a pull request