Test3d17.dat, 17th 'test' file for CPO3D

Capacitance and corner singularities of a tetrahedron.

 

For detailed information see the paper 'Capacitances and singularities of the unit triangle, square, tetrehadron and cube' by F H Read, COMPEL, VOL 23, 572-578 (2004) and the footnotes of the following data files:

test3d06: Capacitance of a cube.

test3d07: Capacitance of a sphere.

test3d15: Capacitance of a circular disc.

test3d17: Capacitance and singularities of a tetrahedron.

test3d18: Capacitance of a unit square.

test3d19: Capacitance of a unit triangle, and summary of capacitance tests.

 

The capacitances of a sphere and disc are found essentially exactly, within the given number of digits -see F. H. Read, J. Computational Physics 133, 1-5 (1997).

 

Summary of the capacitances of a square, tetrahedron and cube:


Capacitance                                 exponent

                                                              along                      across

 

Present

Goto et al

mid-line

edge

edge

Triangle

0.25084(12)


-0.759(12)

-0.255(6)

-0.5

Square

0.3667896(8)

0.3667892(11)

-0.700(4)

-0.204(4)

-0.5 

Tetrahedron

0.35651(4)


-0.677(4)

-0.295(8)

-0.378

Cube

0.6606767(4)

0.6606747(5)

-0.536(5)

-0.210(4)

-0.333