Efficient algorithmic differentiation of CAD frameworks / Mladen Banović ; Advisor: Prof. Dr. Andrea Walther. Paderborn, 2019
Inhalt
- Introduction
- Motivation
- Parametrization approaches: CAD-free vs. CAD-based
- Current approaches to evaluate derivatives in CAD environment
- Thesis contribution
- Thesis structure
- Test-cases
- Algorithmic differentiation of OCCT
- Introduction to OCCT
- Introduction to algorithmic differentiation
- Introduction to ADOL-C
- Approaches of differentiating OCCT
- A sample class
- The code duplication approach
- The inheritance approach
- The controller approach
- The templating approach
- The typedef approach
- Compile and run-time issues of OCCT differentiation
- Verification of differentiated OCCT
- Primal functionality validation of differentiated OCCT
- Gradient verification using U-bend parametrization
- Gradient verification using TU Berlin stator blade parametrization
- Performance tests of differentiated OCCT
- Summary
- Aerodynamic shape optimization with differentiated OCCT
- Mathematical formulation of CAD-based optimization with adjoint method
- STAMPS flow solver
- Gradient-based shape optimization framework
- U-bend optimization results
- TU Berlin stator optimization results
- Summary
- TU Berlin stator optimization with assembly constraints
- Implementation of stator assembly constraints
- Intersection approach
- Interference detection approach based on distance between shapes
- Cylinder positioning during shape optimization
- Optimization results
- Summary
- Improved AD of the VKI in-house CAD and grid generation tool
- Mesh generation of LS89 axial turbine profile
- Structure-exploiting AD of mesh smoothing process
- Tailoring trace size to application requirements
- Coupling ADOL-C drivers to evaluate derivatives
- Handling conditional branches in mesh smoothing
- Gradient verification
- Performance tests of differentiated CADO
- Summary
- Algorithmic differentiation of an industrial airfoil design tool
- Parablading differentiation
- Introduction to Tapenade
- Mixed-language AD of Parablading
- Parablading differentiation issues
- Maintenance aspects
- Verification of differentiated Parablading
- Gradient-based optimization of TU Berlin stator
- Summary
- Conclusion
- Bibliography