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[Robert Gary Cerff <question146389@xxxxxxxxxxxxxxxxxxxxx>]

Question #146389 on DOLFIN changed:
https://answers.launchpad.net/dolfin/+question/146389

Robert Gary Cerff gave more information on the question:
Hi Johannes,

Regarding the new v0.9.9 build of DOLFIN, I am able to successfully run
the example program located in \share\dolfin\demo\pde\navier-
stokes\python\demo.py

However, when attempting to run the adaptive example program located
here,

 \share\dolfin\demo\undocumented\adaptive-pde\navier-stokes.py

... I receive the exception message below. What might be causing this?

***********************************************

(0.4) Marking cells for refinement←[0m
----------------------------------
Using Dorfler marking, fraction 0.5
Marking 40 cells out of 288 (13.9%) for refinement
←[1;37;34m
(0.5) Refining mesh←[0m
-------------------
Ignoring coefficient (<class 'dolfin.function.expression.CompiledExpression'>)
Updating coefficient by interpolation
Traceback (most recent call last):
  File "navier-stokes.py", line 70, in <module>
    (u_h, p_h, c_h) = pde.solve(TOL).split()
  File "C:\FEniCS99\lib\site-packages\dolfin\adaptivity\adaptive.py", line 224, in solve
    self._update(mesh, u_h.function_space())
  File "C:\FEniCS99\lib\site-packages\dolfin\adaptivity\adaptive.py", line 250, in _update
    (self.F, w) = update_form(self.F, mesh, extract=self.u)
  File "C:\FEniCS99\lib\site-packages\dolfin\adaptivity\updates.py", line 44, in update_form
    g = update_coefficient(f, mesh)
  File "C:\FEniCS99\lib\site-packages\dolfin\adaptivity\updates.py", line 64, in update_coefficient
    g = interpolate(f, V)
  File "C:\FEniCS99\lib\site-packages\dolfin\fem\interpolate.py", line 30, in interpolate
    Pv.interpolate(v)
RuntimeError: *** Error: DOLFIN has been compiled without CGAL, IntersectionOperatorImplementation is not available.

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