Turning off fluid solver

[raphaelouillon]

Hi all,
I was just curious to hear if it was possible to turn off the fluid solver and impose the velocity field directly. I am interested in a really simple problem with a constant velocity u(x,y,z,t)= U and a tracer that is passively advected, so I don't need to solve for the velocity field.

[francispoulin]

Yes, there is! You can use PrescribedVelocityField. This will freeze the velocity and only evolve the tracers. There should be something in one of the tests but I'm not sure where. If you have problems finding it let me know, and I can try and dig something up.

[raphaelouillon]

great, thanks!

[simone-silvestri]

you can find an example of usage here

https://github.com/CliMA/Oceananigans.jl/blob/main/validation/solid_body_rotation/solid_body_tracer_advection.jl

[raphaelouillon]

Thanks!