ARL Topologies vs Z88Arion

ARL Topologies is free, open-source software for topology optimization, published by USArmyResearchLab as a United States government project. It is intended for research and general use, and runs self-hosted from the command line with an XML input file. The program separates design representation, optimization method, and objective function. Representations include two- and three-dimensional element-based density discretization with SIMP interpolation, plus nodal-based density discretization with Heaviside projection and filtering. Inputs can be ASCII ExodusII or GMSH meshes, or rectangular pixel and voxel regions. Available optimizers include optimality criterion, method of moving asymptotes, BFGS through NLopt, and a genetic algorithm. Its implemented objective performs static structural finite element analysis. Density results can be post-processed to STL, while VTK, GMSH, and Matlab are output formats. A shared-library objective function allows extension to other problems. Building requires a C++11 compiler and listed libraries.

Z88Arion is a graphical structural optimization program for topology optimization, built on Z88 finite-element analysis software. It provides OC, SKO and TOSS algorithms; imports STEP, ASCII STL, binary STL, NASTRAN, ABAQUS, COSMOS and Z88 project files; and includes tetrahedral, adaptive tetrahedral and mapped hexahedral meshers. The editable material database contains 50 predefined materials, and boundary conditions are set through the graphical interface. Its postprocessor visualizes results, smooths geometry, exports smoothed geometry to STL and connects directly to Z88Aurora. The current release is Z88Arion V3 for 64-bit Windows, with compatibility listed from Windows 7 through Windows 11. The current version is German, while an English version is under development. The Freeware plan costs nothing. Private, research, educational, training and test use need no separate license; commercial users can request a free individual license.