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MFEM
v4.2.0
Finite element discretization library
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Delta function coefficient optionally multiplied by a weight coefficient and a scaled time dependent C-function. More...
#include <coefficient.hpp>
Public Member Functions | |
DeltaCoefficient () | |
Construct a unit delta function centered at (0.0,0.0,0.0) More... | |
DeltaCoefficient (double x, double s) | |
Construct a delta function scaled by s and centered at (x,0.0,0.0) More... | |
DeltaCoefficient (double x, double y, double s) | |
Construct a delta function scaled by s and centered at (x,y,0.0) More... | |
DeltaCoefficient (double x, double y, double z, double s) | |
Construct a delta function scaled by s and centered at (x,y,z) More... | |
void | SetDeltaCenter (const Vector ¢er) |
Set the center location of the delta function. More... | |
void | SetScale (double _s) |
Set the scale value multiplying the delta function. More... | |
void | SetFunction (double(*f)(double)) |
Set a time-dependent function that multiplies the Scale(). More... | |
void | SetTol (double _tol) |
Set the tolerance used during projection onto GridFunction to identify the Mesh vertex where the Center() of the delta function lies. (default 1e-12) More... | |
void | SetWeight (Coefficient *w) |
Set a weight Coefficient that multiplies the DeltaCoefficient. More... | |
const double * | Center () |
double | Scale () |
Return the scale factor times the optional time dependent function. Returns \( s T(t) \) with \( T(t) = 1 \) when not set by the user. More... | |
double | Tol () |
Return the tolerance used to identify the mesh vertices. More... | |
Coefficient * | Weight () |
See SetWeight() for description of the weight Coefficient. More... | |
void | GetDeltaCenter (Vector ¢er) |
Write the center of the delta function into center. More... | |
virtual double | EvalDelta (ElementTransformation &T, const IntegrationPoint &ip) |
The value of the function assuming we are evaluating at the delta center. More... | |
virtual double | Eval (ElementTransformation &T, const IntegrationPoint &ip) |
A DeltaFunction cannot be evaluated. Calling this method will cause an MFEM error, terminating the application. More... | |
virtual | ~DeltaCoefficient () |
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Coefficient () | |
void | SetTime (double t) |
Set the time for time dependent coefficients. More... | |
double | GetTime () |
Get the time for time dependent coefficients. More... | |
double | Eval (ElementTransformation &T, const IntegrationPoint &ip, double t) |
Evaluate the coefficient in the element described by T at the point ip at time t. More... | |
virtual | ~Coefficient () |
Protected Attributes | |
double | center [3] |
double | scale |
double | tol |
Coefficient * | weight |
int | sdim |
double(* | tdf )(double) |
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double | time |
Delta function coefficient optionally multiplied by a weight coefficient and a scaled time dependent C-function.
\( F(x,t) = w(x,t) s T(t) d(x - xc) \)
where w is the optional weight coefficient, s is a scale factor T is an optional time-dependent function and d is a delta function.
WARNING this cannot be used as a normal coefficient. The usual Eval method is disabled.
Definition at line 234 of file coefficient.hpp.
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Construct a unit delta function centered at (0.0,0.0,0.0)
Definition at line 245 of file coefficient.hpp.
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Construct a delta function scaled by s and centered at (x,0.0,0.0)
Definition at line 252 of file coefficient.hpp.
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Construct a delta function scaled by s and centered at (x,y,0.0)
Definition at line 259 of file coefficient.hpp.
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Construct a delta function scaled by s and centered at (x,y,z)
Definition at line 266 of file coefficient.hpp.
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Definition at line 318 of file coefficient.hpp.
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Return a pointer to a c-array representing the center of the delta function.
Definition at line 296 of file coefficient.hpp.
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A DeltaFunction cannot be evaluated. Calling this method will cause an MFEM error, terminating the application.
Implements mfem::Coefficient.
Definition at line 316 of file coefficient.hpp.
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The value of the function assuming we are evaluating at the delta center.
Definition at line 83 of file coefficient.cpp.
void mfem::DeltaCoefficient::GetDeltaCenter | ( | Vector & | center | ) |
Write the center of the delta function into center.
Definition at line 77 of file coefficient.cpp.
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Return the scale factor times the optional time dependent function. Returns \( s T(t) \) with \( T(t) = 1 \) when not set by the user.
Definition at line 301 of file coefficient.hpp.
void mfem::DeltaCoefficient::SetDeltaCenter | ( | const Vector & | center | ) |
Set the center location of the delta function.
Definition at line 69 of file coefficient.cpp.
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Set a time-dependent function that multiplies the Scale().
Definition at line 279 of file coefficient.hpp.
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Set the scale value multiplying the delta function.
Definition at line 276 of file coefficient.hpp.
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Set the tolerance used during projection onto GridFunction to identify the Mesh vertex where the Center() of the delta function lies. (default 1e-12)
Definition at line 284 of file coefficient.hpp.
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Set a weight Coefficient that multiplies the DeltaCoefficient.
The weight Coefficient multiplies the value returned by EvalDelta() but not the value returned by Scale(). The weight Coefficient is also used as the L2-weight function when projecting the DeltaCoefficient onto a GridFunction, so that the weighted integral of the projection is exactly equal to the Scale().
Definition at line 292 of file coefficient.hpp.
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Return the tolerance used to identify the mesh vertices.
Definition at line 304 of file coefficient.hpp.
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See SetWeight() for description of the weight Coefficient.
Definition at line 307 of file coefficient.hpp.
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Definition at line 237 of file coefficient.hpp.
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Definition at line 237 of file coefficient.hpp.
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Definition at line 239 of file coefficient.hpp.
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Definition at line 240 of file coefficient.hpp.
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Definition at line 237 of file coefficient.hpp.
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Definition at line 238 of file coefficient.hpp.