Chair of Aerodynamics and Fluid Mechanics Department of Mechanical Engineering Master’s Thesis 08.02.2021 Performance-aware flexibilization of complex flow HPC solvers The numerical simulation of compressible multi-phase flows containing sharp interfaces is of interest in many engineering applications. The interface physics can be well-captured by a level-set function. This approach, however, makes an efficient implementation of the solver challenging: Classical (well-optimized) stencil operations cannot be applied blindfolded because the respective fluid information is not present in all cells. Computing compressible flows, however, requires the usage of solvers built upon such stencils. In this project, flexible stencil-based kernels of our multiresolution finite volume compressible flow solver ALPACA are to be developed. These kernels are supposed to work on arbitrary parts of the computation domain. Performance on modern HPC systems is a key aspect of the implementation. Hence, profiles have to be done on the LRZ Linux cluster. The programming language is C++17. Tasks: • Profiling baseline version of the kernel functions • Design and implementation of improved versions • Profiling optimized versions Requirements: • Knowledge of C++11 • Ability to work independently • Knowledge of profiling software, beneficial Knowledge of approximate Riemann solvers, beneficial Take-away: • Insight into state-of-the-art research CFD code • Improved C++ and object-oriented programming skills • Experience with HPC-clusters • Scientific working and writing • Project management skills Contact: Nils Hoppe Room MW1617 E-Mail [email protected] Phone 089/289-16336

Performance-aware flexibilization of complex flow HPC solvers

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Page 1: Performance-aware flexibilization of complex flow HPC solvers

Chair of Aerodynamicsand Fluid Mechanics Department of Mechanical Engineering

Master’s Thesis 08.02.2021

Performance-aware flexibilization of complex flow HPC solvers

The numerical simulation of compressible multi-phase flows containing sharp interfaces is ofinterest in many engineering applications. The interface physics can be well-captured by alevel-set function. This approach, however, makes an efficient implementation of the solverchallenging: Classical (well-optimized) stencil operations cannot be applied blindfoldedbecause the respective fluid information is not present in all cells. Computing compressibleflows, however, requires the usage of solvers built upon such stencils.

In this project, flexible stencil-based kernels of our multiresolution finite volume compressibleflow solver ALPACA are to be developed. These kernels are supposed to work on arbitraryparts of the computation domain. Performance on modern HPC systems is a key aspect of theimplementation. Hence, profiles have to be done on the LRZ Linuxcluster. The programming language is C++17.

Tasks:• Profiling baseline version of the kernel functions • Design and implementation of improved versions• Profiling optimized versions

Requirements:• Knowledge of C++11• Ability to work independently• Knowledge of profiling software, beneficial

Knowledge of approximate Riemann solvers, beneficial

Take-away:• Insight into state-of-the-art research CFD code• Improved C++ and object-oriented programming skills• Experience with HPC-clusters• Scientific working and writing• Project management skills

Contact:Nils HoppeRoom MW1617E-Mail [email protected] 089/289-16336