Unknown Variable Displacement

[garcs2]

Hello,

I'm attempting to create a simplified problem by adapting the input file found in modules/subchannel/examples/MultiAppTests/fuel_assembly.i. To do this I'm setting wire parameters to zero, setting spacer_z to zero and spacer_k to zero. I then also changed the mass flow rate computation to use SCMFlatMassFlowRateAux to have a uniform mass flow rate into the subchannel. When I run the problem now I get the following error:

�[31m
*** ERROR ***
/home/garcsamu/Serpent/SNAP-REACTORS-PRIVATE/snapReactors/reactor_models/Wet_Experiment_Models/standard_conditions/sc_test/sc_core.i:132.1:
The following error occurred in the Problem 'MOOSE Problem' of type TriSubChannel1PhaseProblem.

Unknown variable displacement�[39m

Stack frames: 13
0: libMesh::print_trace(std::ostream&)
1: moose::internal::mooseErrorRaw(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >)
2: MooseBase::callMooseError(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, bool) const
3: /home/garcsamu/moose_exec/moose/framework/libmoose-opt.so.0(+0xbcb147) [0x15555313e147]
4: MooseVariableFieldBase& SubProblem::getVariableHelper<std::shared_ptr<SolverSystem> >(unsigned int, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, Moose::VarKindType, Moose::VarFieldType, std::vector<std::shared_ptr<SolverSystem>, std::allocator<std::shared_ptr<SolverSystem> > > const&, SystemBase const&) const
5: FEProblemBase::getVariable(unsigned int, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, Moose::VarKindType, Moose::VarFieldType) const
6: SubChannel1PhaseProblem::initialSetup()
7: TransientBase::init()
8: MooseApp::executeExecutioner()
9: MooseApp::run()
10: /home/garcsamu/moose_exec/snapbench/snapbench-opt(+0x50e8) [0x5555555590e8]
11: __libc_start_main
12: /home/garcsamu/moose_exec/snapbench/snapbench-opt(+0x538a) [0x55555555938a]
Abort(1) on node 0 (rank 0 in comm 0): application called MPI_Abort(MPI_COMM_WORLD, 1) - process 0
--------------------------------------------------------------------------
prterun detected that one or more processes exited with non-zero status,
thus causing the job to be terminated. The first process to do so was:

   Process name: [prterun-wr2n4-116409@1,1] Exit code:    1
--------------------------------------------------------------------------

My question is, what should I interpret the error to mean? I can share the input file if that would be helpful in understanding what the source of the error could be.

[GiudGiud]

Hello

The error tells you you are missing a displacement variable.
This variable is used to deform the geometry. But you can just have a 0 valued one in the AuxVariables block.

I ll make a patch for this example so it runs without modification.

Guillaume