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User guide

Last edited by Adrien Crovato

Once installed, BLASTER is initialized using the following lines:

from blaster.blast.api.blaster_api import init_blaster
_blast = init_blaster(cfg, icfg, iSolverName, task)

where:

  • _blast is a Python dictionary containing the objects required to run BLASTER
  • cfg is a Python dictionary that configures the viscous solver
  • icfg is a Python dictionary that configures the inviscid solver (e.g. see DART)
  • iSolverName is the name of the inviscid solver (available options: 'DART')
  • task is the type of calculation to be made (available options: 'analysis', 'optimization')

The configuration dictionary cfgconsists of the parameters defined here under:

cfg = {
'Re': float # Flow Reynolds number.
'Minf': float # Freestream Mach number (only used for time step computation).
'CFL0': float # Initial CFL number.
'Verb': int # Verbosity level of the viscous solver.
'xtrF': [float, float] # Forced transition location [upper, lower].
'couplIter': int # Maximum number of coupling iterations.
'couplTol': float # Tolerance to end computation (drag count between 2 iterations).
'iterPrint': int # Number of iterations between which the coupler outputs its state.
'resetInv': bool # Resets the inviscid solver at each iteration (True), reuses previous state as initial condition (False).
}

The return dictionary _blast contains:

  • coupler: the coupler driving the viscous inviscid process
  • isol: the interface of the inviscid solver (see blast/interfaces/DSolversInterface.py)
  • vsol: the viscous solver
  • adj: the coupled viscous inviscid adjoint solver

A viscous inviscid solution is then obtained by:

coupler = _blast['coupler']
coupler.run()