PorousFlowPeacemanBorehole.h File Reference

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Classes
class	PorousFlowPeacemanBorehole
	Approximates a borehole by a sequence of Dirac Points. More...

Functions
template<>
InputParameters	validParams< PorousFlowPeacemanBorehole > ()

Function Documentation

validParams< PorousFlowPeacemanBorehole >()

template<>

InputParameters validParams< PorousFlowPeacemanBorehole >

(

)

Definition at line 18 of file PorousFlowPeacemanBorehole.C.

{
  InputParameters params = validParams<PorousFlowLineSink>();
  params.addRequiredParam<FunctionName>(
      "character",
      "If zero then borehole does nothing.  If positive the borehole acts as a sink "
      "(production well) for porepressure > borehole pressure, and does nothing "
      "otherwise.  If negative the borehole acts as a source (injection well) for "
      "porepressure < borehole pressure, and does nothing otherwise.  The flow rate "
      "to/from the borehole is multiplied by |character|, so usually character = +/- "
      "1, but you can specify other quantities to provide an overall scaling to the "
      "flow if you like.");
  params.addRequiredParam<Real>("bottom_p_or_t",
                                "For function_of=pressure, this parameter is the "
                                "pressure at the bottom of the borehole, "
                                "otherwise it is the temperature at the bottom of "
                                "the borehole");
  params.addRequiredParam<RealVectorValue>(
      "unit_weight",
      "(fluid_density*gravitational_acceleration) as a vector pointing downwards.  "
      "Note that the borehole pressure at a given z position is bottom_p_or_t + "
      "unit_weight*(q - q_bottom), where q=(x,y,z) and q_bottom=(x,y,z) of the "
      "bottom point of the borehole.  The analogous formula holds for "
      "function_of=temperature.  If you don't want bottomhole pressure (or "
      "temperature) to vary in the borehole just set unit_weight=0.  Typical value "
      "is = (0,0,-1E4), for water");
  params.addParam<Real>("re_constant",
                        0.28,
                        "The dimensionless constant used in evaluating the borehole effective "
                        "radius.  This depends on the meshing scheme.  Peacemann "
                        "finite-difference calculations give 0.28, while for rectangular finite "
                        "elements the result is closer to 0.1594.  (See  Eqn(4.13) of Z Chen, Y "
                        "Zhang, Well flow models for various numerical methods, Int J Num "
                        "Analysis and Modeling, 3 (2008) 375-388.)");
  params.addParam<Real>("well_constant",
                        -1.0,
                        "Usually this is calculated internally from the element geometry, the "
                        "local borehole direction and segment length, and the permeability.  "
                        "However, if this parameter is given as a positive number then this "
                        "number is used instead of the internal calculation.  This speeds up "
                        "computation marginally.  re_constant becomes irrelevant");
  params.addClassDescription(
      "Approximates a borehole in the mesh using the Peaceman approach, ie "
      "using a number of point sinks with given radii whose positions are "
      "read from a file.  NOTE: if you are using PorousFlowPorosity that depends on volumetric "
      "strain, you should set strain_at_nearest_qp=true in your GlobalParams, to ensure the nodal "
      "Porosity Material uses the volumetric strain at the Dirac quadpoints, and can therefore be "
      "computed");
  return params;
}