Lock Exchange Example

[surbhidhiman]

Hello Oceananigans community, I am fairly new here and I am interested in building my simulations and contribution skills with the Oceananigans package. I have opened a discussion post here and an issue here, with idea of implementing a basic lock-exchange problem. My goal is to use this case to deepen my understanding of computational fluid dynamics, boundary conditions, and density-driven mixing. My ideal outcome is to produce a fully documented example script that meets the standards of the existing examples.

I have opened this PR with a very basic version which includes my current understanding of how to run the simulations. I will happily welcome any and all feedback for any changes or ideas that would help me build on this existing script to make it a worthwhile contribution. So far, I have pulled from the internal tide example as well as the lock release validation case, and I will continue to build on what I have so far.

Thank you in advance for your time and help!