NextSim - Next generation of industrial aerodynamic simulation code

Computer simulation of pressure distribution
Computer simulation of the air pressure on the surface of a simplified aircraft model in high-lift conditions during landing. A higher-order numerical method (Discontinuous Galerkin) has been used to produce the results.

NextSim partners, as fundamental European players in Aeronautics and Simulation, recognise that there is a need to increase the capabilities of current Computational Fluid Dynamics tools for aeronautical design by re-engineering them for extreme-scale parallel computing platforms. The backbone of NextSim is centered on the fact that, today, the capabilities of leading-edge emerging HPC architectures are not fully exploited by industrial simulation tools. Current state-of-the-art industrial solvers do not take sufficient advantage of the immense capabilities of new hardware architectures, such as streaming processors or many-core platforms. A combined research effort focusing on algorithms and HPC is the only way to make possible to develop and advance simulation tools to meet the needs of the European aeronautical industry.

NextSim will focus on the development of the computational fluid dynamics (CFD) solver CODA (Finite Volume and high-order discontinuous Galerkin schemes), that will be the new reference solver for aerodynamic applications inside AIRBUS group, having a significant impact in the aeronautical market. To demonstrate NextSim market impact, AIRBUS has defined a series of market relevant problems. The numerical simulation of those problems is still a challenge for the aeronautical industry and their solution, at a required accuracy and an affordable computational cost, is still not possible with the current industrial solvers. Following this idea, three additional working areas are proposed in NextSim:

  • algorithms for numerical efficiency
  • algorithms for data management
  • efficient implementation of those algorithms in the most advanced HPC platforms.

Finally, NextSim will provide access to project results through the mini-apps concept, small pieces of software, seeking synergies with open source components, which demonstrate the use of the novel mathematical methods and algorithms developed in CODA but that will be freely distributed to the scientific community. DLR's work concerns algorithmic efficiency improvements by implementing multigrid methods for convergence acceleration - also for higher order discretization schemes. However, the focus is on improved load balancing, which is often particularly impaired when using algorithmic efficiency enhancements such as mesh and order adaptation. For this purpose, in addition to static repartitioning, dynamic repartitioning is to be implemented, which, based on a detection of imbalances during the running computation, initiates a migration of parts of the computational task between the computational units. Hereby, imbalances of different causes and between different parts of the code can be addressed in the same way.


NextSim - Next Generation of Industrial Aerodynamic Simulation Code
3/2021 - 2/2024
  • DLR Institute of Aerodynamics and Flow Technology
  • Barcelona Supercomputing Center (BSC) (Leader)
  • Universidad Politécnica De Madrid
  • Centre Internacional De Mètodes Numèrics En Enginyeria / UPC (CIMNE)
  • Centre Européen de Recherche et de Formation Avancée en Calcul Scientifique (CERFACS)


European High-Performance Computing Joint Undertaking Joint Undertaking (JU) under grant agreement No 956104. The JU receives support from the European Union’s Horizon 2020 research and innovation programme and Spain, France, Germany.


Institute of Aerodynamics and Flow Technology