BEST - Boltzmann Equation Solver Tool

BEST is a lattice Boltzmann flow solver developed at the Institute of Fluid Mechanics (LSTM), University of Erlangen-Nuremberg. Instead of directly solving the Navier-Stokes equations, a discrete Boltzmann equation is solved to simulate the flow of a Newtonian fluid. This approach is proven to be a promising alternative to classical CFD methods. BEST is applied in various scientific and engineering disciplines such as:

  • turbulent flows and aerodynamics
  • chemical and process engineering
  • bio and environmental processes

Presently the software package BEST contains the following features:

  • Two and three dimensional laminar and turbulent flow (Large-Eddy turbulence model) together with chemical reaktions and energy transport.
  • The gridgeneration is based on a voxel approach. An interface to CAD-Tools is available.
  • Efficient simulations of flow through geometries with highly complex boundaries such as porous media.
  • The code is fully parallised by domain decomposition and standard parallisation paradigms (MPI and OpenMP).
  • The implementation shows excellent performance on High Performance Computers both for single node performance and the parallel speed-up. On the full HLRS NEC SX-8 System still more than 60% of the peak performance is realized (see figure).


Prof. Dr. Dr. h.c. F. Durst
Lehrstuhl für Strömungsmechanik
Universität Erlangen-Nürnberg

Dipl.–Ing. Thomas Zeiser
Regionales Rechenzentrum Erlangen
Universität Erlangen-Nürnberg

Peter Lammers
Universität Stuttgart