 An instance of a <code>Model</code> contains the following fields:</p><ul><li><code>grid</code>: an instance of a WAVI.jl <code>Grid</code> object, that stores information about the numerical grid.</li><li><code>params</code>: an instance of a WAVI.jl <code>Params</code> object that stores phyiscal parameters that enter the model.</li><li><code>solver_params</code>: an instance of a WAVI.jl <code>SolverParams</code> object that stores parameters relating to the numerical solution of the governing equations