- postprocessorThe name of the postprocessor
C++ Type:PostprocessorName
Controllable:No
Description:The name of the postprocessor
ChangeOverTimePostprocessor
Description
This post-processor computes the change or relative change in a post-processor value over a time step or over the entire transient. The change is computed as where is the relative change at time index , is the value of post-processor at time index , and is the reference value for the change (either the previous time value, , or the initial value, ). The relative change, which may be requested instead using the "compute_relative_change" parameter is computed as
Optionally, the user may specify to return the absolute value of the change.
Example Syntax
The following example demonstrates how this post-processor is used:
# This test tests the ChangeOverTimePostprocessor, which computes the change
# in a postprocessor value with respect to the previous value or with respect to
# the initial value. This test creates a time-dependent function postprocessor
# and then computes its change over a timestep. The FE problem used here is a
# dummy problem and has no effect on the test.
[Mesh]
type = GeneratedMesh
dim = 1
nx = 5
[]
[Variables]
[./u]
[../]
[]
[Kernels]
[./time_derivative]
type = TimeDerivative
variable = u
[../]
[./diff]
type = Diffusion
variable = u
[../]
[]
[BCs]
[./left]
type = DirichletBC
variable = u
boundary = left
value = 0
[../]
[./right]
type = DirichletBC
variable = u
boundary = right
value = 1
[../]
[]
[Executioner]
type = Transient
start_time = 0.0
dt = 1.0
num_steps = 2
[]
[Functions]
[./my_function]
type = ParsedFunction
expression = '1 + t * t'
[../]
[]
[Postprocessors]
[./my_postprocessor]
type = FunctionValuePostprocessor
function = my_function
execute_on = 'initial timestep_end'
[../]
[./change_over_time]
type = ChangeOverTimePostprocessor
postprocessor = my_postprocessor
change_with_respect_to_initial = false
execute_on = 'initial timestep_end'
[../]
[]
[Outputs]
file_base = 'change_over_time_previous'
csv = true
[]
Input Parameters
- change_with_respect_to_initialFalseCompute change with respect to initial value instead of previous value
Default:False
C++ Type:bool
Controllable:No
Description:Compute change with respect to initial value instead of previous value
- compute_relative_changeFalseCompute magnitude of relative change instead of change
Default:False
C++ Type:bool
Controllable:No
Description:Compute magnitude of relative change instead of change
- execute_onTIMESTEP_ENDThe list of flag(s) indicating when this object should be executed, the available options include NONE, INITIAL, LINEAR, NONLINEAR, TIMESTEP_END, TIMESTEP_BEGIN, MULTIAPP_FIXED_POINT_END, MULTIAPP_FIXED_POINT_BEGIN, FINAL, CUSTOM, ALWAYS.
Default:TIMESTEP_END
C++ Type:ExecFlagEnum
Controllable:No
Description:The list of flag(s) indicating when this object should be executed, the available options include NONE, INITIAL, LINEAR, NONLINEAR, TIMESTEP_END, TIMESTEP_BEGIN, MULTIAPP_FIXED_POINT_END, MULTIAPP_FIXED_POINT_BEGIN, FINAL, CUSTOM, ALWAYS.
- prop_getter_suffixAn optional suffix parameter that can be appended to any attempt to retrieve/get material properties. The suffix will be prepended with a '_' character.
C++ Type:MaterialPropertyName
Controllable:No
Description:An optional suffix parameter that can be appended to any attempt to retrieve/get material properties. The suffix will be prepended with a '_' character.
- take_absolute_valueFalseOption to take absolute value of change
Default:False
C++ Type:bool
Controllable:No
Description:Option to take absolute value of change
Optional Parameters
- allow_duplicate_execution_on_initialFalseIn the case where this UserObject is depended upon by an initial condition, allow it to be executed twice during the initial setup (once before the IC and again after mesh adaptivity (if applicable).
Default:False
C++ Type:bool
Controllable:No
Description:In the case where this UserObject is depended upon by an initial condition, allow it to be executed twice during the initial setup (once before the IC and again after mesh adaptivity (if applicable).
- control_tagsAdds user-defined labels for accessing object parameters via control logic.
C++ Type:std::vector<std::string>
Controllable:No
Description:Adds user-defined labels for accessing object parameters via control logic.
- enableTrueSet the enabled status of the MooseObject.
Default:True
C++ Type:bool
Controllable:Yes
Description:Set the enabled status of the MooseObject.
- execution_order_group0Execution order groups are executed in increasing order (e.g., the lowest number is executed first). Note that negative group numbers may be used to execute groups before the default (0) group. Please refer to the user object documentation for ordering of user object execution within a group.
Default:0
C++ Type:int
Controllable:No
Description:Execution order groups are executed in increasing order (e.g., the lowest number is executed first). Note that negative group numbers may be used to execute groups before the default (0) group. Please refer to the user object documentation for ordering of user object execution within a group.
- force_postauxFalseForces the UserObject to be executed in POSTAUX
Default:False
C++ Type:bool
Controllable:No
Description:Forces the UserObject to be executed in POSTAUX
- force_preauxFalseForces the UserObject to be executed in PREAUX
Default:False
C++ Type:bool
Controllable:No
Description:Forces the UserObject to be executed in PREAUX
- force_preicFalseForces the UserObject to be executed in PREIC during initial setup
Default:False
C++ Type:bool
Controllable:No
Description:Forces the UserObject to be executed in PREIC during initial setup
- outputsVector of output names where you would like to restrict the output of variables(s) associated with this object
C++ Type:std::vector<OutputName>
Controllable:No
Description:Vector of output names where you would like to restrict the output of variables(s) associated with this object
- use_displaced_meshFalseWhether or not this object should use the displaced mesh for computation. Note that in the case this is true but no displacements are provided in the Mesh block the undisplaced mesh will still be used.
Default:False
C++ Type:bool
Controllable:No
Description:Whether or not this object should use the displaced mesh for computation. Note that in the case this is true but no displacements are provided in the Mesh block the undisplaced mesh will still be used.