Intrepid
Intrepid::Basis_HDIV_QUAD_I1_FEM< Scalar, ArrayScalar > Class Template Reference

Implementation of the default H(div)-compatible FEM basis of degree 1 on Quadrilateral cell. More...

Inheritance diagram for Intrepid::Basis_HDIV_QUAD_I1_FEM< Scalar, ArrayScalar >:

List of all members.

## Public Member Functions

Constructor.
void getValues (ArrayScalar &outputValues, const ArrayScalar &inputPoints, const EOperator operatorType) const
Evaluation of a FEM basis on a reference Quadrilateral cell.
void getValues (ArrayScalar &outputValues, const ArrayScalar &inputPoints, const ArrayScalar &cellVertices, const EOperator operatorType=OPERATOR_VALUE) const
FVD basis evaluation: invocation of this method throws an exception.

## Private Member Functions

void initializeTags ()
Initializes tagToOrdinal_ and ordinalToTag_ lookup arrays.

## Detailed Description

### template<class Scalar, class ArrayScalar> class Intrepid::Basis_HDIV_QUAD_I1_FEM< Scalar, ArrayScalar >

Implementation of the default H(div)-compatible FEM basis of degree 1 on Quadrilateral cell.

Implements Raviart-Thomas basis of degree 1 on the reference Quadrilateral cell. The basis has cardinality 4 and spans a INCOMPLETE bi-linear polynomial space. Basis functions are dual to a unisolvent set of degrees-of-freedom (DoF) defined and enumerated as follows:

===================================================================================================
|         |           degree-of-freedom-tag table                    |                            |
|   DoF   |----------------------------------------------------------|       DoF definition       |
| ordinal |  subc dim    | subc ordinal | subc DoF ord |subc num DoF |                            |
|=========|==============|==============|==============|=============|============================|
|    0    |       1      |       0      |       0      |      1      |   L_0(u) = (u.n)(0,-1)     |
|---------|--------------|--------------|--------------|-------------|----------------------------|
|    1    |       1      |       1      |       0      |      1      |   L_1(u) = (u.n)(1,0)      |
|---------|--------------|--------------|--------------|-------------|----------------------------|
|    2    |       1      |       2      |       0      |      1      |   L_2(u) = (u.n)(0,1)      |
|---------|--------------|--------------|--------------|-------------|----------------------------|
|    3    |       1      |       3      |       0      |      1      |   L_3(u) = (u.n)(-1,0)     |
|=========|==============|==============|==============|=============|============================|
|   MAX   |  maxScDim=2  |  maxScOrd=5  |  maxDfOrd=0  |      -      |                            |
|=========|==============|==============|==============|=============|============================|

Remarks:
• In the DOF functional where is the side (edge) tangent, i.e., the choice of normal direction is such that the pair is positively oriented.
• Direction of side tangents is determined by the vertex order of the sides in the cell topology and runs from side vertex 0 to side vertex 1, whereas their length is set equal to the side length. For example, side 1 of all Quadrilateral reference cells has vertex order {1,2}, i.e., its tangent runs from vertex 1 of the reference Quadrilateral to vertex 2 of that cell. On the reference Quadrilateral the coordinates of these vertices are (1,-1) and (1,1), respectively. Therefore, the tangent to side 1 is (1,1)-(1,-1) = (0,2) and the normal to that side is (2,0). Because its length already equals side length, no further rescaling of the side tangent is needed.
• The length of the side normal equals the length of the side. As a result, the DoF functional is the value of the normal component of a vector field at the side center times the side length. The resulting basis is equivalent to a basis defined by using the side flux as a DoF functional. Note that all sides of the reference Quadrilateral<> cells have length 2.

Definition at line 103 of file Intrepid_HDIV_QUAD_I1_FEM.hpp.

## Member Function Documentation

template<class Scalar , class ArrayScalar >
 void Intrepid::Basis_HDIV_QUAD_I1_FEM< Scalar, ArrayScalar >::getValues ( ArrayScalar & outputValues, const ArrayScalar & inputPoints, const EOperator operatorType ) const [virtual]

Evaluation of a FEM basis on a reference Quadrilateral cell.

Returns values of operatorType acting on FEM basis functions for a set of points in the reference Quadrilateral cell. For rank and dimensions of I/O array arguments see Section MD array template arguments for basis methods.

Parameters:
 outputValues [out] - rank-3 or 4 array with the computed basis values inputPoints [in] - rank-2 array with dimensions (P,D) containing reference points operatorType [in] - operator applied to basis functions

Implements Intrepid::Basis< Scalar, ArrayScalar >.

Definition at line 93 of file Intrepid_HDIV_QUAD_I1_FEMDef.hpp.

The documentation for this class was generated from the following files: