13.239. SOLID239 - 3-D 20-Node Diffusion Solid

Matrix or VectorGeometryShape FunctionsIntegration Points
Diffusivity Matrix and Diffusing Substance Generation Load VectorBrickEquation 11–23814
WedgeEquation 11–2133 x 3
PyramidEquation 11–1972 x 2 x 2
TetEquation 11–1904
Damping MatrixSame as diffusivity matrix. If KEYOPT(1) = 1, the damping matrix is diagonalized as described in Lumped Matrices.
Diffusion Flux Load VectorQuadEquation 11–933 x 3
TriangleEquation 11–656

13.239.1. Other Applicable Sections

Diffusion in the Mechanical APDL Theory Reference describes the derivation of diffusion element matrices and load vectors as well as diffusion flux evaluation.


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