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Features

ppkMHD is a C++ CFD application framework designed with the performance portability library kokkos. The code can run on a laptop as well as on a cluster of GPUs (e.g. ouessant at IDRIS (IBM Power8 + Nvidia P100))

Here is a short list of numerical features:

• 2nd order MUSCL/Hancock for compressible hydrodynamics and MHD (same as in RamsesGPU. )
• high-order MOOD schemes (hydrodynamics only)
• high-order spectral difference method (SDM) schemes with positivity preserving and limiter

Future versions may include adaptive mesh-refinement by interfacing p4est library.

• CPU only AMR code is CanoP
• Prototype AMR Kokkos code is khamr

Install

System requirements

Supported platform

• linux
• Mac

Software requirements

• CMake
• optional Doxygen for documentation
• optional : an MPI compiler (e.g. OpenMPI, MPVAPICH). If you intend to use this software on a GPU cluster, please cross-check your MPI implementation is cuda-aware (might need to re-compile or ask your sysadmin).

Please note that library kokkos is automatically downloaded and built as part of ppkMHD. kokkos source directory is populated using a git submodule.

Gallery

Spectral Difference Methods (SDM)

Sod shocktube

Shu-Osher test-case

Four-Quadrant test case 2, SDM of degree 2 / degree 4

• mesh size is 400x400
• final time is 0.3
• positivity preserving : enabled
• limiter : disabled

degree2	degree4
<img src="img/sdm_fq_deg2_0000010.png" alt="Four quadrant testcase 2" width=500"/>	<img src="img/sdm_fq_deg4_0000010.png" alt="Four quadrant testcase 2" width=500"/>

High-Mach Jet (Mach number M=27)

The following image represents the time evolution of a jet (Mach number is 27) between t=0 and t=0.1. Simulation is done with the SDM scheme (N=3), positivity preserving and limiter are activated.

Mach number M=27 comparison degree3 and 4