actuator disk

[Dusan]

Is there any way to implement an actuator disk?

[Adrian]

OpenLB offers a set of flexible primitives for implementing any LBM scheme. Currently I am not aware of any public implementation of an actuator disk model but I can guarantee that it is possible to implement this. If you tell me what exactly you want to do, I will be able to point you at a good direction.

[Dusan]

I would like to replicate some of the results of an experiment on a channel wing by NACA, see here: https://ntrs.nasa.gov/api/citations/19930087470/downloads/19930087470.pdf

I think a good first approximation is modeling the propeller as an actuator disk.

Maybe a point to start this is by modeling the classic actuator disk theory and see how flow is actually contracting.

[Adrian]

Ok, so do you already have an exact idea of which actuator disk model you want to apply?

Without knowing much about this approach I guess it will boil down to updating the per-cell forces for the cells in the actuator disk domain every time step depending on the surrounding flow / model parameters. If so, a good way of implementing such operations in OpenLB is to write a “post processor” and assigning it to the respective cells for execution at a sensible step of the LB algorithm (commonly the post-stream “stage”). Our user guide provides an introduction on how to write such a post processor.

[Dusan]

Thanks Adrian! I’ll look into the user guide for the relevant instructions.

[Author]

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