reporter that reports the nodal variable values at the elements locat…

…ed by the nearestElemsToLine. Also renamed the variable used to for filtering elements and updated tests. closes idaholab#108

src/reporters/ClosestElemsToLine.C

@@ -36,8 +36,9 @@ ClosestElemsToLine::validParams()
   params.addRequiredParam<ReporterName>("point_z2",
                                         "input reporter of z-coordinate name for point.  This uses "
                                         "the reporter syntax <reporter>/<name>.");
-  params.addParam<VariableName>("variable",
-                                "Name for the variable in domain to determine uniqueness");
+  params.addParam<VariableName>("variable_filter",
+                                "Variable name to filter elements by.  Only one element can be "
+                                "found for each integer value of this variable.");
   params.addParam<Real>("projection_tolerance",
                         libMesh::TOLERANCE,
                         "Search tolerance between line and the closest node.  If a node is not "
@@ -59,7 +60,7 @@ ClosestElemsToLine::ClosestElemsToLine(const InputParameters & parameters)
     _pt_x(declareValueByName<std::vector<Real>>("point_x", REPORTER_MODE_REPLICATED)),
     _pt_y(declareValueByName<std::vector<Real>>("point_y", REPORTER_MODE_REPLICATED)),
     _pt_z(declareValueByName<std::vector<Real>>("point_z", REPORTER_MODE_REPLICATED)),
-    _var(isParamValid("variable") ? getParam<VariableName>("variable") : "")
+    _var(isParamValid("variable_filter") ? getParam<VariableName>("variable_filter") : "")
 {
 }
 

test/tests/reporters/closest_elems_to_line/constant_line_projection.i

@@ -107,7 +107,7 @@
     point_x2 = pt/pt2_x
     point_y2 = pt/pt2_y
     point_z2 = pt/pt2_z
-    variable = oneID
+    variable_filter = oneID
     outputs = out
   []
   [differentID_out]
@@ -119,7 +119,7 @@
     point_x2 = pt/pt2_x
     point_y2 = pt/pt2_y
     point_z2 = pt/pt2_z
-    variable = differentID
+    variable_filter = differentID
     outputs = out
   []
   [noID_out]

test/tests/reporters/closest_elems_to_line_NodalVarValue/dfn_test.i

@@ -0,0 +1,72 @@
+[Mesh]
+  [cluster34]
+    type = FileMeshGenerator
+    file = 'Cluster_34_zid.e'
+    use_for_exodus_restart = true
+  []
+[]
+
+[Problem]
+  solve = false
+[]
+
+[AuxVariables]
+  [z_id]
+    family = MONOMIAL
+    order = CONSTANT
+    initial_from_file_var = z_id
+    initial_from_file_timestep = 'LATEST'
+  []
+  [one]
+    order = FIRST
+    family = LAGRANGE
+    initial_condition = 1
+  []
+[]
+
+[Executioner]
+  type = Steady
+[]
+
+[Reporters]
+  [pt]
+    type = ConstantReporter
+    real_vector_names = 'pt1_x pt1_y pt1_z pt2_x pt2_y pt2_z'
+    real_vector_values = '132.1; 97.5; 189.5; 136.5; 103.2; 50.6'
+    outputs = none
+  []
+
+  [no_var]
+    block = "9 10"
+    type = ClosestElemsToLineNodalVarValue
+    projection_tolerance = 5
+    point_x1 = pt/pt1_x
+    point_y1 = pt/pt1_y
+    point_z1 = pt/pt1_z
+    point_x2 = pt/pt2_x
+    point_y2 = pt/pt2_y
+    point_z2 = pt/pt2_z
+    variable_to_sample = one
+    outputs = out
+  []
+  [domain_var]
+    type = ClosestElemsToLineNodalVarValue
+    projection_tolerance = 5
+    point_x1 = pt/pt1_x
+    point_y1 = pt/pt1_y
+    point_z1 = pt/pt1_z
+    point_x2 = pt/pt2_x
+    point_y2 = pt/pt2_y
+    point_z2 = pt/pt2_z
+    variable_filter = z_id
+    variable_to_sample = one
+    outputs = out
+  []
+[]
+
+[Outputs]
+  [out]
+    type = JSON
+    execute_system_information_on = none
+  []
+[]