L-Shape Bracket
===============

An L-shaped structural bracket: a 60 × 60 square domain with the
upper-right quadrant voided (non-design region).  The top edge is fixed and
a downward point load is applied at the mid-right edge.

Running
-------

.. code-block:: bash

   ggp optimize --preset l_shape

To save the density image:

.. code-block:: bash

   ggp optimize --preset l_shape --output-dir docs/_static

The preset uses the **AMJax** FEM solver by default (``fem_solver: amjax``).

Result
------

.. figure:: _static/l_shape_optimized.png
   :alt: Optimized L-shape bracket topology
   :width: 60%
   :align: center

   Optimized density field after 400 MMA iterations (40 % volume fraction).

Problem details
---------------

+---------------------+------------------+
| Parameter           | Value            |
+=====================+==================+
| Domain              | 60 × 60 (L-shape)|
+---------------------+------------------+
| Mesh                | 60 × 60 quads    |
+---------------------+------------------+
| Formulation         | Free 2D          |
+---------------------+------------------+
| Method              | AMNA (MNA)       |
+---------------------+------------------+
| Components          | 18               |
+---------------------+------------------+
| ``r_gp`` (σ)        | 1.0              |
+---------------------+------------------+
| Min thickness       | 3 elements       |
+---------------------+------------------+
| Volume fraction     | 0.40             |
+---------------------+------------------+
| Algorithm           | MMA              |
+---------------------+------------------+
| Max iterations      | 400              |
+---------------------+------------------+