QGDipoles

About

This package solves for steady, propagating dipolar solutions in a layered quasi-geostrophic (LQG) model or a surface quasi-geostrophic (SQG) model. It is designed to work with GeophysicalFlows.jl and FourierFlows.jl.

Installation

QGDipoles.jl can be installed using the Julia package manager. It is recommended to create a new environment for each project and install any new packages to that environment.

Installation may be done using the package manager directly by typing ] at the Julia REPL and entering the following: julia add https://github.com/mncrowe/QGDipoles.jl.git instantiate Alternatively, you may import the package manager and install by entering the following directly into the Julia REPL: julia import Pkg Pkg.add(url="https://github.com/mncrowe/QGDipoles.jl") Pkg.instantiate() This package is not compatible with versions of Julia earlier than 1.10 due to the eachslice function.

Examples and Documentation

See examples/ for example scripts. Full documetation is available here.

Dependencies

This package requires the following dependencies:

• FFTW (v1.8.0)
• Jacobi (v0.7.0)
• LinearAlgebra
• NLsolve (v4.5.1)
• QuadGK (v2.9.4)
• SpecialFunctions (v2.4.0)
• CUDA (v5.4.3)

The specified versions are confirmed to work. Earlier versions may also work.

Files

This directory contains the following:

• docs/: contains documentation and build script for html generation.
• examples/: example scripts, more examples are available in the documentation.
• src/: source Julia files for QGDipoles.jl.
• test/: tests for QGDipoles.jl package.
• utils/: additional utilities for package management.
• Project.toml: project file containing dependencies for QGDipoles.jl.
• README.md: this readme file.

Methodology

Dipolar vortex solutions are calculated using a method originally proposed for surface QG by Johnson & Crowe 2023 and extended to layered QG by Crowe & Johnson 2024. An overview of this method is discussed in the full documentation. This code contains a Julia implementation of the MATLAB code included as supplementary material with Crowe & Johnson 2024 and also includes a version of the previously unrealeased SQG version discussed in Johnson & Crowe 2023 and Crowe & Johnson 2023. For those interested in the original (layered QG only) implementation, it can be found here.

Contributing

Issues should be submitted here and discussions or questions here.

We follow the ColPrac guide for collaborative practices. New contributors should make sure to read that guide. Below are some additional practices we follow.

Editing

The source files are stored in src/. It is recommended to open Julia with the QGDipoles project active by running julia --project=. from the root directory. Be careful not to add unnecessary packages to Project.toml and do not push a Project.toml file which contains QGDipoles.jl as a dependency.

We use Documenter.jl for creating the package documentation and JuliaFormatter.jl for consistent code formatting. These packages should NOT be added to the package dependencies of QGDipoles.jl and we recommend adding them to your base environment so they are available from any active environment.

Formatting

This codebase is formatted using JuliaFormatter.jl. Formatting can be done by entering the following into the Julia REPL from the root directory: julia import JuliaFormatter JuliaFormatter.format(".")

Documentation

The documentation is stored within docs/ and can be built using Documenter.jl by running docs/make.jl. Full instructions for using Documenter.jl are available here. The documentation can be re-built by opening Julia using julia --project=docs/ then entering the following into the REPL: julia import Pkg Pkg.develop(path=".") # this adds the local copy of `QGDipoles.jl` to the `docs` environment include("docs/make.jl") The newly built documentation will be available in docs/build and can be viewed by opening docs/build/index.html with a web browser.

Tests

Tests are stored in test/ and can be run using either julia include("test/runtests.jl") or by activating the package manager by entering ] at the Julia REPL then entering test.

Utilities

Additional tools for development are stored in utils/. Currently this directory contains:

• clear_deps.sh: a shell script to clear unwanted dependencies from Project.toml and docs/Project.toml. This should be run from the root directory.