Compressible/Incompressible Advanced reactive turbulent simulations with Overset
Multiphysics, multiscale Navier-Stokes solver for turbulent reacting flows in complex geometries.
CIAO performs Direct Numerical Simulations (DNS) as well as Large-Eddy Simulations (LES) of the Navier-Stokes equations along with multiphysics effects (multiphase, combustion, soot, spark, …). It is a structured, finite difference code, which enables the coupling of multiple domains and their simultaneous computation. Moving meshes are supported and overset meshes can be used for local mesh refinement. A fully compressible as well as an incompressible/low-Mach solver are available within the code framework. Spatial and temporal staggering of flow variables are used in order to increase the accuracy of stencils. The sub-filter model for the momentum equations is an eddy viscosity concept in form of the dynamic Smagorinsky model with Lagrangian averaging along fluid particle trajectories. While the fully compressible solver uses equation of states or tabulated fluid properties, a transport equation for internal/total energy, and a low-storage five-stage, explicit Runge-Kutta method for time integration, the incompressible/low-Mach solver uses Crank-Nicolson time advancement and an iterative predictor corrector scheme. The resulting Poisson equation for pressure is solved by HYPRE’s multi-grid solver. The momentum equations are spatially discretized with central schemes of arbitrary order and various different schemes are available for the scalar equations (WENO, HOUC, QUICK, BQUICK, …).
- 458,752 cores on BlueGene/Q (JUQUEEN)
Programming language and model
- I/O with MPI, HDF5 or VisIt
Tested on platforms
- x86 (LRZ SuperMUC, BSC MareNostrum III, RWTH Compute Cluster)
Application developers and contact
Mathis Bode, Tobias Falkenstein, Heinz Pitsch
Institute for Combustion Technology
RWTH Aachen University
Department of Mechanical Engineering
(Text and images provided by the developers)