13.278. SOLID278 - 3D 8-Node Homogeneous/Layered Thermal Solid

SOLID278 is available in two forms:

Homogeneous (nonlayered) thermal solid (KEYOPT(3) = 0, the default) - see SOLID278 - 3D 8-Node Homogeneous Thermal Solid.
Layered thermal solid (KEYOPT(3) = 1) - see SOLID278 - 3D 8-Node Layered Thermal Solid.

13.278.1. SOLID278 - 3D 8-Node Homogeneous Thermal Solid

Matrix or Vector	Shape Functions	Integration Points
Conductivity Matrix and Heat Generation Load Vector	Equation 11–227	2 x 2 x 2
Specific Heat Matrix	Equation 11–227. Matrix is diagonalized as described in Lumped Matrices	Same as conductivity matrix
Convection Surface Matrix and Load Vector	Equation 11–227 specialized to the face	2 x 2

13.278.2. SOLID278 - 3D 8-Node Layered Thermal Solid

Matrix or Vector	Shape Functions	Integration Points
Conductivity Matrix and Heat Generation Load Vector	Equation 11–227	In-plane: 2 x 2 Thru-the-thickness: 1, 3, 5, 7, or 9 per layer Defaults to 3
Specific Heat Matrix	Equation 11–227. Matrix is diagonalized as described in Lumped Matrices	Same as conductivity matrix
Convection Surface Matrix and Load Vector	Equation 11–227 specialized to the face	2 x 2

13.278.3. Other Applicable Sections

Heat Flow describes the derivation of the element matrices and load vectors as well as heat flux evaluations for a general thermal analysis element. Mass Transport is discussed in Mass Transport (Advection) and Mass Transport (Advection) in the Thermal Analysis Guide. The Mass transport option is only available for KEYOPT(3) = 0 the homogeneous (nonlayered) form.