# PorousFlowSquarePulsePointSource

PorousFlowSquarePulsePointSource implements a constant mass point source that adds (removes) fluid at a constant mass flux rate for times between the specified start and end times. If no start and end times are specified, the source (sink) starts at the start of the simulation and continues to act indefinitely. For instance:

[DiracKernels]
[./sink1]
type = PorousFlowSquarePulsePointSource
start_time = 100
end_time = 300
point = '0.5 0.5 0'
mass_flux = -0.1
variable = pp
[../]
[./sink]
type = PorousFlowSquarePulsePointSource
start_time = 600
end_time = 1400
point = '0.5 0.5 0'
mass_flux = -0.1
variable = pp
[../]
[./source]
point = '0.5 0.5 0'
start_time = 1500
mass_flux = 0.2
end_time = 2000
variable = pp
type = PorousFlowSquarePulsePointSource
[../]
[]

(modules/porous_flow/test/tests/dirackernels/squarepulse1.i)

## Input Parameters

• variableThe name of the variable that this kernel operates on

C++ Type:NonlinearVariableName

Options:

Description:The name of the variable that this kernel operates on

• mass_fluxThe mass flux at this point in kg/s (positive is flux in, negative is flux out)

C++ Type:double

Options:

Description:The mass flux at this point in kg/s (positive is flux in, negative is flux out)

• pointThe x,y,z coordinates of the point source (sink)

C++ Type:libMesh::Point

Options:

Description:The x,y,z coordinates of the point source (sink)

### Required Parameters

• start_time0The time at which the source will start (Default is 0)

Default:0

C++ Type:double

Options:

Description:The time at which the source will start (Default is 0)

• end_time1e+30The time at which the source will end (Default is 1e30)

Default:1e+30

C++ Type:double

Options:

Description:The time at which the source will end (Default is 1e30)

### Optional Parameters

• drop_duplicate_pointsTrueBy default points added to a DiracKernel are dropped if a point at the same locationhas been added before. If this option is set to false duplicate points are retainedand contribute to residual and Jacobian.

Default:True

C++ Type:bool

Options:

Description:By default points added to a DiracKernel are dropped if a point at the same locationhas been added before. If this option is set to false duplicate points are retainedand contribute to residual and Jacobian.

• control_tagsAdds user-defined labels for accessing object parameters via control logic.

C++ Type:std::vector

Options:

Description:Adds user-defined labels for accessing object parameters via control logic.

• enableTrueSet the enabled status of the MooseObject.

Default:True

C++ Type:bool

Options:

Description:Set the enabled status of the MooseObject.

• 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

Options:

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.

• vector_tagsnontimeThe tag for the vectors this Kernel should fill

Default:nontime

C++ Type:MultiMooseEnum

Options:nontime time

Description:The tag for the vectors this Kernel should fill

• extra_vector_tagsThe extra tags for the vectors this Kernel should fill

C++ Type:std::vector

Options:

Description:The extra tags for the vectors this Kernel should fill

• matrix_tagssystemThe tag for the matrices this Kernel should fill

Default:system

C++ Type:MultiMooseEnum

Options:nontime system

Description:The tag for the matrices this Kernel should fill

• extra_matrix_tagsThe extra tags for the matrices this Kernel should fill

C++ Type:std::vector

Options:

Description:The extra tags for the matrices this Kernel should fill