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 |