Simplify heating source usage.

test/tests/thermal-legacy/geometry.xml

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+<?xml version='1.0' encoding='utf-8'?>
+<geometry>
+  <dagmc_universe auto_mat_ids="true" filename="dagmc.h5m" id="1" />
+</geometry>

test/tests/thermal-legacy/main.i

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+[Mesh]
+  type = FileMesh
+  file = copper_air_bcs_tetmesh.e
+[]
+
+[Problem]
+  type = FEProblem
+[]
+
+[Executioner]
+  type = Transient
+  num_steps = 5
+  dt = 1
+  solve_type = NEWTON
+  abort_on_solve_fail=True
+[]
+
+[Variables]
+  [temperature]
+    order = FIRST
+    family = LAGRANGE
+    initial_condition = 300 # Start at room temperature
+  []
+[]
+
+[AuxVariables]
+  [heating-local]
+      order = CONSTANT
+      family = MONOMIAL
+  []
+  [heating-local-err]
+      order = CONSTANT
+      family = MONOMIAL
+  []
+  [flux]
+      order = CONSTANT
+      family = MONOMIAL
+  []
+  [flux-err]
+      order = CONSTANT
+      family = MONOMIAL
+  []
+[]
+
+[BCs]
+  [air-outer]
+    type = DirichletBC
+    variable = temperature
+    boundary = 'top-outer bottom-outer left-outer right-outer front-outer back-outer'
+    value = 300 # (K)
+  []
+[]
+
+[UserObjects]
+  [uo-heating-function]
+    type = FunctionUserObject
+    variable = heating-local
+    execute_on = "initial"
+  []
+[]
+
+[Functions]
+  [heating-function]
+    type = VariableFunction
+    uoname = "uo-heating-function"
+  []
+[]
+
+[Materials]
+  [copper_props]
+    type = ADGenericConstantMaterial
+    prop_names = 'thermal_conductivity specific_heat density'
+    prop_values = '3.97 0.385 8.920' # W/cm*K, J/g-K, g/cm^3
+    block = 1
+  []
+  [air_props]
+    type = ADGenericConstantMaterial
+    prop_names = 'thermal_conductivity specific_heat density'
+    prop_values = '0.26 1 0.001'
+    block = 2
+  []
+  [heating]
+    type = ADGenericFunctionMaterial
+    prop_names = 'volumetric_heat'
+    prop_values = 'heating-function'
+    block = '1 2'
+    constant_on = 'ELEMENT'
+    output_properties = 'volumetric_heat'
+    outputs = exodus
+  []
+[]
+
+[Kernels]
+  [heat_conduction]
+    type = ADHeatConduction
+    variable = temperature
+  []
+  [heat_conduction_time_derivative]
+    type = ADHeatConductionTimeDerivative
+    variable = temperature
+  []
+  [heat-source]
+    type = ADMatHeatSource
+    material_property = volumetric_heat
+    variable = temperature
+    block = '1 2'
+  []
+[]
+
+[MultiApps]
+  [openmc]
+    type = FullSolveMultiApp
+    app_type = OpenMCApp
+    execute_on = "timestep_begin"
+    input_files = "openmc.i"
+    positions = '0   0   0'
+    library_path = ../../../openmc/lib
+  []
+[]
+
+[Transfers]
+  [./to_openmc]
+    type = MoabMeshTransfer
+    to_multi_app = openmc
+    moabname = "moab"
+  [../]
+[]
+
+[Outputs]
+  exodus = true
+  execute_on = 'timestep_end'
+
+[]

test/tests/thermal-legacy/materials.xml

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+<?xml version='1.0' encoding='utf-8'?>
+<materials>
+  <material id="1" name="air">
+    <density units="g/cc" value="0.001205" />
+    <nuclide ao="0.781557629247" name="N14" />
+    <nuclide ao="0.002873370753" name="N15" />
+    <nuclide ao="0.210668126508" name="O16" />
+    <nuclide ao="7.9873492e-05" name="O17" />
+    <nuclide ao="1.53456e-05" name="Ar36" />
+    <nuclide ao="2.8934e-06" name="Ar38" />
+    <nuclide ao="0.004581761" name="Ar40" />
+  </material>
+  <material id="2" name="copper" temperature="300">
+    <density units="g/cm3" value="8.96" />
+    <nuclide ao="0.6915" name="Cu63" />
+    <nuclide ao="0.3085" name="Cu65" />
+  </material>
+</materials>

test/tests/thermal-legacy/openmc.i

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+[Mesh]
+  type = GeneratedMesh
+  dim = 1
+  nx = 1
+[]
+
+[Problem]
+  type = OpenMCProblem
+[]
+
+[Executioner]
+  type = OpenMCExecutioner
+  variables = 'heating-local flux'
+  score_names = 'heating-local flux'
+  tally_ids = '1 1'
+  err_variables = 'heating-local-err flux-err'
+  neutron_source = 1.0e18
+  launch_threads=false
+[]
+
+[UserObjects]
+  [moab]
+    type = MoabUserObject
+    bin_varname = "temperature"
+    material_names = 'copper_props air_props'
+    material_openmc_names = 'copper air'
+    output_skins = false
+    length_scale = 1.0
+  []
+[]

test/tests/thermal-legacy/settings.xml

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+<?xml version='1.0' encoding='utf-8'?>
+<settings>
+  <run_mode>fixed source</run_mode>
+  <particles>1000</particles>
+  <batches>10</batches>
+  <source strength="1.0">
+    <space type="point">
+      <parameters>0 0 0</parameters>
+    </space>
+  </source>
+  <output>
+    <summary>false</summary>
+    <tallies>false</tallies>
+  </output>
+  <state_point>
+    <batches />
+  </state_point>
+  <photon_transport>false</photon_transport>
+  <temperature_method>interpolation</temperature_method>
+</settings>

test/tests/thermal-legacy/tests

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+[Tests]
+  [./test]
+    type = 'Exodiff'
+    input = 'main.i'
+    exodiff = 'main_out.e'
+  [../]
+[]

test/tests/thermal-mech-legacy/copper_air_bcs_tetmesh.e

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+../thermal-legacy/copper_air_bcs_tetmesh.e

test/tests/thermal-mech-legacy/dagmc.h5m

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+../thermal-legacy/dagmc.h5m

test/tests/thermal-mech-legacy/geometry.xml

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+<?xml version='1.0' encoding='utf-8'?>
+<geometry>
+  <dagmc_universe auto_mat_ids="true" filename="dagmc.h5m" id="1" />
+</geometry>