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What is Bolt?

\(\texttt{Bolt}\) is an open-source Python based framework for solving kinetic theory formulations uptil 5-dimensional phase space on a range of devices using the finite volume method, and/or the advective Semi-Lagrangian approach originally proposed by Cheng&Knorr. The framework is designed to solve a range of physical systems where the domain of interest can be mapped on to a rectangular grid. It is designed to target a range of hardware platforms via use of the ArrayFire library, and is completely parallelized to run on large clusters by use of the PETSc library.

The current release has the following capabilities:

• Dimensionality - Upto 2D3V phase space dimensionality
• Interpolation Methods - Linear, Cubic Spline
• Reconstruction Methods - minmod, PPM, WENO5
• Riemann Solvers - 1st Order Upwind flux, Local Lax-Friedrics flux
• Platforms - CPUs, OpenCL Devices, CUDA Devices
• Temporal Discretisation:
  • Time Splitting: Strang, Lie, SWSS
  • Time Stepping : Explicit - RK2, RK4, RK6
• Precision - Double
• Solution Files Exported - HDF5 (.h5, .hdf5)