source: inundation/ga/storm_surge/wiki/future_directions.txt @ 1574

ANUGA Future Directions (2005-2006)


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Draft of known issues regarding the ANUGA software
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Numerical issues

CFL condition (centroid-midpt distances versus inscribed circle ? or error estimator)
Gradient limiters
Forcing terms:
    Friction of Mud
    Viscosity



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Functionality issues

Mesh generation:
    Through graphical generator
    Through scripts
    Alternative triangulators (Strang, ?.)
    alpha-shapes

refactoring triangle interface
outputting a ?triangle? readable file (from pmesh?)

  from pmesh issues file:
      Main issues  (TBA)  

Georeferencing
  Code works in UTM coordinates. Zone boundaries cannot be crossed
  Could code be cast in terms of lat/lons?

least_squares, use of quad-tree may not use all datapoints 
        (currently fixed by expand search, need algorithm for searching neighbouring    treenodes)

        Give feedback when
                points outside mesh
                mesh outside points boundary

        use sparse matrix (CSR) format in ?build_interpolation_matrix_A?
        simplify geo-referencing

Checkpointing (largely done but needs to be revisited)

Ability to create additional quantities and initialise arbitrarily
 
FIXMEs (TBA)


File management (msh, pts, dem, ..) ? introduce the notion of a project
 - reduce # of methods that read/write sww files (Yes)

 
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Efficiency issues

Parallelisation

Edgefluxes are currently computed twice (f01 = -f10) 
(This has been fixed by Matt Hardy)

Increase Timesteps (Implicit techniques?)

Optimise creation and importing of domains (C-code and caching) 


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Architecture

Settle dataflows and formats (pts, dem, msh, sww, etc)
 
?finaltime? to be renamed ?duration?


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API:

Suggestion for set_quantity
      set_quantity(name, X, location, region)
   where
        name: Name of quantity
      X:
                -Compatible list,
              -Numeric array,
              -constant
                -callable object (f: x, y -> z) where x,y,z are arrays
                        - inline
                        - file functions
                        - polygon functions
              -another quantity Q or an expression of the form
    a*Q+b*R+c, where 
        a,b,c are scalars, arrays or quantities
                        Q,R are quantities (or 1?)
                - list of points with attribute values (use LS)
                - pts filename (use LS and caching)            
                - general expression to be parsed   

        location: Where values are to be stored.
Permissible options are: vertices, edges, centroid,    unique_vertices
        region: Identify subset of triangles. Permissible values are
                  - tag name (refers to tagged region)
                    - indices (refers to specific triangles)
                    - polygon (identifies region)
                (incorporate uniqueness/non-uniqueness)
            

Making methods private, using _private
Or write the API in a separate module.


Make stage appear as any other quantity:
Either 
   1: Make stage a subclass of quantity having knowledge of elevation and a special  
       limiter (or more limiters)
Or
   2: Equip each quantity with a limiter class
      (Con: A limiter for stage should never be applied to any other quantity) 


Also, investigate if Quantity and Conserved_quantity should be one class (Steve).

Finally, reconcile the optimised gradient limiter of Matt's with the more general framework



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Other:

Should we remove Python code superseded by C-extensions?
  Pros:   Leaner code and no risk
  Cons:  Less readable algorithms 

Move py code into files such as quantity_ext.py and have python wrappers with doc strings for all functions. Name the code in extensions _ext and conditional import as usual.


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Visualisation

Swollen: 
        Export to movie
        Use maps
        Colourcoding
        z-scale

Matplotlib:
        Realtime and ?post mortem? generation of colour coded maps with         contourlines.

Visual Python:
        Steves new and improved tool



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Development

Restructuring and moving svn repository

Flatten directory structure

Apply buildbot

Use real bugtracking/project management tool 
(see http://www.generalconcepts.com/resources/tracking, plone, basecamp,?
Try out TRAC which integrates into subversion

Zeus? 


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Documentation

Hire technical writer to produce
- Getting started 
- User guide
- Reference manual ? semi automated

Mathematical model description  (Steve & Chris)


-----------------
Validation and QA

Merimbula (Steve & Chris)
PNG Landslide study or watertank data (Adrian?)
BOM
SMEC
CSIRO


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Naming

The collection as well as individual modules may benefit from better names.


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Release

Search for appropriate procedure for OSS release (Ole is onto that with AGIMO)