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A multiphysics framework for compressible and incompressible flow, aeroacoustics, and combustion phenomena.

Scientific area

Computational fluid dynamics, computational aeroacoustics, conjugate heat transfer, flows with combustion, particulate flows.

Short description

The multiphysics framework ZFS is developed at the Institute of Aerodynamics at RWTH Aachen University, Germany since 2004. It is used to simulate compressible and incompressible flow, aeroacoustics, and combustion phenomena for various fundamental, technical, and biofluidmechanical problems. It uses hierarchical Cartesian grids with a quadtree/octree structure and supports solution adaptive mesh refinement as well as flows with immersed moving boundaries.
For the High-Q club, the computational aeroacoustics component of ZFS has been evaluated on JUQUEEN. It uses a high-order discontinuous Galerkin method for the spatial discretization of the acoustic perturbation equations and a fourth-order Runge-Kutta scheme for integration in time to solve for the aeroacoustic pressure field.


  • 458,752 cores (917,504 compute threads) on BlueGene/Q (JUQUEEN)
  • 93,600 cores (187,200 compute threads) on Cray XC40 (Hornet)

Strong scaling of ZFS on JUQUEENStrong scaling of ZFS on JUQUEEN

Programming language and model

  • C++
  • MPI, OpenMP

Tested on platforms

  • BlueGene/Q
  • x86

Application developers

Michael Schlottke, Matthias Meinke, Wolfgang Schröder
Chair of Fluid Mechanics and Institute of Aerodynamics
RWTH Aachen University

Andreas Lintermann
Simulation Laboratory Highly Scalable Fluids & Solids Engineering
Jülich Supercomputing Centre
Forschungszentrum Jülich GmbH


Michael Schlottke

(Text and images provided by the developers)