Dual timestepping error: metaclass conflict?

General
1

Hi, everyone

I am trying to use dual stepping with following settiing:

[solver-time-integrator]
formuation = dual
scheme = bdf2
pseudo-scheme = euler
tstart = 0.0
tend = 100.0
dt = 0.005
pseudo-dt = 0.001
controller = none
pseudo-niters-max = 20
pseudo-niters-min = 5
pseudo-aresid = 1e-5
pseudo-rresid = 1e-5

It turns out the following error:

[root@localhost dual]# pyfr run -b openmp -p ../euler_vortex_2d.pyfrm euler_vortex_2d.ini

Traceback (most recent call last):
File "/opt/rh/rh-python34/root/usr/bin/pyfr", line 11, in <module>
sys.exit(main())
File "/opt/rh/rh-python34/root/usr/lib/python3.4/site-packages/pyfr/__main__.py", line 110, in main
args.process(args)
File "/opt/rh/rh-python34/root/usr/lib/python3.4/site-packages/pyfr/__main__.py", line 235, in process_run
args, NativeReader(args.mesh), None, Inifile.load(args.cfg)
File "/opt/rh/rh-python34/root/usr/lib/python3.4/site-packages/pyfr/__main__.py", line 216, in _process_common
solver = get_solver(backend, rallocs, mesh, soln, cfg)
File "/opt/rh/rh-python34/root/usr/lib/python3.4/site-packages/pyfr/solvers/__init__.py", line 14, in get_solver
return get_integrator(backend, systemcls, rallocs, mesh, initsoln, cfg)
File "/opt/rh/rh-python34/root/usr/lib/python3.4/site-packages/pyfr/integrators/__init__.py", line 40, in get_integrator
integrator = type(name, tuple(bc for bn, bc in bases), dict(name=name))
TypeError: metaclass conflict: the metaclass of a derived class must be a (non-strict) subclass of the metaclasses of all its bases
2

Hi,

It should be “formulation”. Due to the typo PyFR is defaulting to
standard time stepping. This of course gives an error because PyFR does
not have a standard BDF-2 time stepper.

In the next release I’ll see if we can’t throw a more meaningful
exception here.

Regards, Freddie.

3

I AM SO SORRY…