(feat) Add the ability to perform 3D VII computations and (feat) Added sparseLu solver in the API

The error raised at runtime is removed to allow the creation of blowing elements in 3D computations. SparseLu is another direct solver that does not require IntelMKL

dart/api/core.py

@@ -204,8 +204,6 @@ def init_dart(cfg, scenario='aerodynamic', task='analysis', viscous=False):
             _pbl.add(dart.Kutta(_msh, [cfg['Tes'][i], cfg['Wakes'][i]+'_', cfg['Wings'][i], cfg['Fluid']]))
     # add transpiration (blowing) boundary conditions
     if viscous:
-        if _dim != 2 or task != 'analysis':
-            raise RuntimeError('Viscous-inviscid interaction calculations are currently supported only for 2D analysis!\n')
         _blwb = dart.Blowing(_msh, cfg['Wing'])
         _blww = dart.Blowing(_msh, cfg['Wake'])
         _pbl.add(_blwb)
@@ -223,6 +221,8 @@ def init_dart(cfg, scenario='aerodynamic', task='analysis', viscous=False):
         linsol = tbox.Mumps()
     elif cfg['LSolver'] == 'GMRES':
         linsol = tbox.Gmres(cfg.get('G_fill', 2), 1e-6, cfg.get('G_restart', 50), cfg.get('G_tol', 1e-5), 200)
+    elif cfg['LSolver'] == 'SparseLu':
+        linsol = tbox.SparseLu()
     else:
         raise RuntimeError('Available linear solvers: PARDISO, MUMPS or GMRES, but ' + cfg['LSolver'] + ' was given!\n')
     # initialize the nonlinear (outer) solver