CAESES vs OpenLSTO

CAESES is a parametric engineering platform for simulation-driven design, geometry variation, and shape optimization. Its NURBS modeling tools support geometry creation and variation, while morphing tools can alter imported geometries. Software connectors can automate workflows spanning geometry generation, meshing, simulation, post-processing, and evaluation. Available methods include parameter studies, sensitivity analysis, single- and multi-objective optimization, and surrogate modeling. Listed integrations include ANSYS Workbench and optimization tools such as HEEDS, Dakota, optiSLang, Optimus, and modeFRONTIER. CAESES does not include simulation solvers, so users connect external CFD or other simulation software. The Standard Edition includes geometry modeling, software connections, design studies, variation and optimization strategies, morphing, design variants, and batch mode. The Batch Mode License adds non-GUI operation and HPC cluster optimization; the Power Edition includes advanced optimization and a maritime, turbo, or propeller add-on. Pricing is available on request, with no free plan. Windows and Linux downloads include a free two-week trial; listed systems include Windows 11 and Linux tested on Debian 12 and Ubuntu 24.04.

OpenLSTO is open-source C++ software for structural topology optimization using a level set method. It seeks to minimize compliance, or maximize stiffness, within a volume constraint in a two-dimensional design domain. Developed and maintained by researchers at UC San Diego and Cardiff University, the described first light version is limited to that 2D problem. It runs through command-line arguments in a terminal; simple serial cases without external libraries can be compiled and executed with a C++ compiler. OpenLSTO produces.vtk solution files that ParaView can read, so users need a data visualization tool for post-processing. The project favors in-house components where possible and is available under the Apache 2.0 license. It runs on Linux, macOS, and Windows, with repository-clone and ZIP download options. The software is free: the OpenLSTO plan is free. The project says expanded capabilities using externally provided software are planned for a more advanced version.