19 August 2018 05:19:08 PM

FEM2D_POISSON_CG:
  C++ version:

  Compiled on Aug 19 2018 at 17:19:08.

  A version of FEM2D_POISSON using sparse storage
  and a conjugate gradient solver.

  Solution of the Poisson equation in an arbitrary region
  in 2 dimensions.

  - DEL H(x,y) DEL U(x,y) + K(x,y) * U(x,y) = F(x,y) in the region

                                     U(x,y) = G(x,y) on the boundary.

  The finite element method is used,
  with triangular elements,
  which must be a 3 node linear triangle.

  Node file is "baffle_nodes.txt".
  Element file is "baffle_elements.txt".
  Number of nodes =          512

  First 10 nodes

  Row:       1             2       
  Col

    1              0             1
    2              0         1.375
    3              0          1.75
    4              0         2.125
    5              0           2.5
    6              0         2.875
    7              0          3.25
    8              0         3.625
    9              0             4
   10              0         4.375

  Element order =            3
  Number of elements =       874

  First 10 elements

  Row:      1       2       3  
  Col

    1     317     306     298  
    2      28       3      18  
    3       4       3      28  
    4      28      33       4  
    5      72      69      57  
    6      49      33      28  
    7     114     106     122  
    8      84      80      67  
    9      88      69      72  
   10     147     133     131  

  Quadrature order =          3

  Number of nonzero coefficients NZ_NUM = 3308

  Step        Residual

     1         1.94589
     2         1.02565
     3        0.411712
     4         0.27157
     5        0.143458
     6        0.102652
     7       0.0490419
     8       0.0317833
     9       0.0164217
    10      0.00860515
    11      0.00392365
    12      0.00229199
    13      0.00156186
    14     0.000742249
    15     0.000399329
    16     0.000205418
    17     0.000124346
    18     6.76339e-05
    19      3.2241e-05
    20      1.9699e-05
    21     1.34579e-05
    22     7.03567e-06
    23     3.52624e-06
    24     1.96816e-06
    25     1.07468e-06
    26     7.19786e-07
    27     4.24296e-07
    28     2.44519e-07
    29     1.35357e-07
    30      8.1082e-08
    31     4.70307e-08

  Number of iterations was 31
  Estimated error is 2.89709e-08

  Part of the solution vector vector U:

         1                 0
         2                 0
         3                 0
         4                 0
         5                 0
         6                 0
         7                 0
         8                 0
         9                 0
        10                 0

  Wrote an ASCII file
    "baffle_values.txt".
  of the form
    U ( X(I), Y(I) )
  which can be used for plotting.

FEM2D_POISSON_CG:
  Normal end of execution.

19 August 2018 05:19:08 PM