Difference between revisions of "Sig Numerical Optimization / Tutorials"

Revision as of 20:46, 2 September 2014

1 Tutorials using DAKOTA

1.1 Bounded-constrained gradient optimization of a blunt body

Blunt body with control points. Initial shape.

Shape optimization of the blunt body

• In this short tutorial we do a bounded-constrained gradient optimization study of a blunt body.

• We aim at optimizing the shape of a blunt body. The goal is to minimize the drag coefficient.

• The body is parametrized using Bezier curves with four control points and six linear constraints.

• To do the optimization we use Dakota, Salome and OpenFOAM. The geometry and mesh are generated with Salome.

• This tutorial works fine with OpenFOAM 2.3.0, Salome 7.3.0 and Dakota 5.4.0.

• Before running the tutorial, execute the script dakota_cleanup.

• The coupling of Dakota, Salome and OpenFOAM is handled using a bash script (generic interface), that controls the simulation workflow.

• File:Blunt body case.zip. Inside the README.FIRST file, you will find the instructions of how to run the case.

1.2 Topology optimization of a plate using solidDisplacementFoam

Plate Geometry

• This tutorials includes two cases (vector parameter andbounded-constrained gradient-based) for topology optimization of a plate.

• The goal is to reduce the weight of the plate by maximizing the stress on the object.

• The geometry has a single variable (the radius of the hole) and two linear constraints.

• The main goal of this tutorials is to show the optimization workflow using Salome, cfMesh, OpenFOAM and Dakota.

• The geometry is generated with Salome, while the mesh is generated using cartesian2DMesh (from cfMesh).

• This tutorial was tested with OpenFOAM 2.2.2, Salome 7.4.0 and Dakota 6.0.

• Before running the tutorial, execute the script dakota_cleanup.

• Bash scripts are used to couple the different tools, in particular stlCombine is used to merge surface STL files generated by the Salome script.

• File:Plate.tar.gz. Inside the README.FIRST file, you will find the instructions of how to run the case.

1.3 More tutorials

• More tutorials