Solving PDE in Pyomo

[Daniel Haught]

Hey,

I am trying to set up a chromatography model in Pyomo. I am first trying to do that by just implementing a transport model like in https://groups.google.com/g/pyomo-forum/c/060kKMFSBec. However when ever I try and do so I get this error.

Ipopt 3.11.1: ERROR: Solver (ipopt) returned non-zero return code (3221225501)
ERROR: See the solver log above for diagnostic information.
Traceback (most recent call last):

  File ~\anaconda3\envs\pyomo311\Lib\site-packages\spyder_kernels\customize\utils.py:209 in exec_encapsulate_locals
    exec_fun(compile(code_ast, filename, "exec"), globals)

  File c:\users\millie\desktop\lab_cadet_scripts\doe\column_test_v2.py:159
    results = opt.solve(m, tee=True)

  File ~\anaconda3\envs\pyomo311\Lib\site-packages\pyomo\opt\base\solvers.py:628 in solve
    raise ApplicationError("Solver (%s) did not exit normally" % self.name)

ApplicationError: Solver (ipopt) did not exit normally

I get the same error when trying to solve the examples:

Heat Transfer Example: https://github.com/Pyomo/pyomo/blob/main/examples/dae/PDE_example.py

Distill Example: https://github.com/Pyomo/pyomo/blob/main/examples/dae/run_distill.py

I do not get the error when running an ODE example like: https://github.com/Pyomo/pyomo-tutorials/blob/main/exercises/Dynamic/exercises-1/small_dae_soln.py#L8

I played around with different versions of pyomo but had no luck. Does anybody know how to fix this issue?

Best,

Daniel