NSMB

The Navier Stokes Multi Block solver NSMB is a parallel flow solver using multi block structured grids. The multi block approach was adopted for two reasons, first to facilitate the generation of meshes around realistic configurations, and second to use parallel computers efficiently by solving the flow equations in different blocks in parallel.

NSMB was written on top of the MemCom data base system which provides the data structure for the flow simulation. MemCom is used as archive system since all information relevant for a flow simulation is stored in the data base. Variable storage is allocated dynamically block by block using a Dynamic Memory Manager (DMM).

NSMB has been developped and extended in order to predict numerous flow problems, ranging from very low speed flows (imcompressible preconditioning) to hypersonics. A large panel of spatial discretisation (upwind, central) and time integration (explicit, implicit) schemes is available. Various turbulence models are implemented in NSMB including algebraic models such as the Baldwin-Lomax and the Granville models, the one-equation Spalart-Allmaras model and two-equation models. Several advanced meshing techniques has been developped in order to widen the code capabilities.

NSMB 5.3 (October 2001) has the following main characteristics:

• Finite volume formulation on multiblock structured grids
• Numerical schemes
  • Central schemes
    • 2nd-order Jameson
    • 4th-order Ducros
  • Upwind schemes (Roe, AUSM+, HLLE)
    • 2nd and 3rd-order MUSCL with various limiters
    • 5th-order Weighted ENO
• Time integration for unsteady flows
  • 4th-order Runge-Kutta
  • 2nd-order dual time stepping
• Convergence acceleration for steady flows
  • LU-SGS, SSOR implicit algorithm
  • Multigrid technique
• Turbulence modeling
  • 0-,1-,2-equation models (B-L, S-A, k-e, k-w)
  • LES
• Meshing techniques
  • Conservative patched grids
  • Automatic Mesh Refinement (AMR)
  • Moving grid formulation: ALE
• Preconditionning for low speed flows
• Equilibrium chemistry for high speed flows
• Two-degree-of-freedom structure solver

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