OptFEM2DP1 Toolbox  V1.2
Matlab/Octave Optimized P1-Lagrange Finite Element Method in 2D
Functions
valid/validMassW2DP1.m File Reference

Validation function for the assembly of the weighted mass matrix for $P_1$-Lagrange finite elements. More...

Go to the source code of this file.

Functions

function  validMassW2DP1 ()
 Validation function for the assembly of the weighted mass matrix for $P_1$-Lagrange finite elements.
function  validMassW2DP1>checkTest1 (Test)
function  validMassW2DP1>checkTest2 (Test)
function  validMassW2DP1>checkTest3 (h, error)

Detailed Description

Validation function for the assembly of the weighted mass matrix for $P_1$-Lagrange finite elements.

Definition in file validMassW2DP1.m.

Function Documentation

function validMassW2DP1>checkTest1 (   Test)

Definition at line 143 of file validMassW2DP1.m.

function validMassW2DP1>checkTest2 (   Test)

Definition at line 158 of file validMassW2DP1.m.

function validMassW2DP1>checkTest3 (   h,
  error 
)

Definition at line 181 of file validMassW2DP1.m.

function validMassW2DP1 ( )

Validation function for the assembly of the weighted mass matrix for $P_1$-Lagrange finite elements.

The Weighted Mass Matrix $\MasseF{w}$ is given by

\[\MasseF{w}_{i,j}=\int_\DOMH w(\q)\FoncBase_i(\q) \FoncBase_j(\q) d\q,\ \forall (i,j)\in\ENS{1}{\nq}^2\]

where $\FoncBase_i$ are $P_1$-Lagrange basis functions. This Matrix is computed by functions MassWAssembling2DP1{Version} where {Version} is one of base, OptV0, OptV1 and OptV2.

  • Test 1: Computation of the MassW Matrix using all the versions giving errors and computation times
  • Test 2: Computation of the integral

    \[\int_\DOM w(x,y) u(x,y) v(x,y) dxdy \approx \DOT{\MasseF{w} \vecb{U}}{\vecb{V}}\]

    where $\vecb{U}_i=u(\q^i)$ and $\vecb{V}_i=v(\q^i)$. Functions $u$, $v$ and $w$ are those defined in valid_FEMmatrices.
  • Test 3: One retrieves the order 2 of $P_1$-Lagrange integration

    \[|\int_\DOM u\,v\,w -\Pi_h(u)\,\Pi_h(v)\,\Pi_h(w)d\DOM| \leq C h^2\]

See also:
MassWAssembling2DP1base, MassWAssembling2DP1OptV0, MassWAssembling2DP1OptV1, MassWAssembling2DP1OptV2, valid_FEMmatrices, SquareMesh, GetMaxLengthEdges
Results
validMassW2DP1.png
figure : validMassW2DP1 Test 3 result
Author:
François Cuvelier
Date:
2012-11-26
Copyright
See License issues

Definition at line 17 of file validMassW2DP1.m.

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