Represents isoparametric fournode tetrahedral element. Each node has 1 degree of freedom. The same numbering convection is adopted as in mechanics, see Fig. 14. The element features are summarized in Table 52.
Keyword  Tetrah1ht 
Description  Isoparametric, fournode tetrahedral element with linear approximation for heat transfer problems 
Specific parameters  [NIP #(in)] 
Parameters  NIP: allows to change the default number of integration point used. 
Unknowns  Single dof (T_f  temperature) is required in each node. 
Approximation  Linear approximation of temperature. 
Integration  Integration using gauss integration formula in 1 (the default), or 4 integration points. The default number of integration point used can be overloaded using NIP parameter. 
Loads  Body loads are supported. Boundary loads are supported and computed using numerical integration. The side and surface numbering is shown in Fig. 14. 
Features   
CS properties   
Status 

Represents isoparametric eightnode brick/hexahedron finite element for heat transfer problems. Each node has 1 degree of freedom. The element features are summarized in Table 53.
Keyword  Brick1ht 
Description  Isoparametric, hexahedral 3D element with linear approximation for heat transfer problems 
Specific parameters  [NIP #(in)] 
Parameters  NIP: allows to change the default number of integration point used. 
Unknowns  Single dof (T_f  temperature) is required in each node. 
Approximation  Linear approximation of temperature. 
Integration  Integration using gauss integration formula in 8 (the default), or 27 integration points. The default number of integration point used can be overloaded using NIP parameter. 
Loads  Body loads are supported. Boundary loads are supported and computed using numerical integration. The side and surface numbering is shown in fig. (23)). 
Features   
CS properties   
Status 

Represents isoparametric eightnode quadrilateral finite element for heat and mass (one constituent) transfer problems. Two dofs (T_f  temperature and C_1  concentration) are required in each node. Linear approximation of temperature and mass concentration. Other features are similar to Brick1 element, see section 3.3.2.
Implementation of quadratic 3d 20node finite element. Each node has 1 degree of freedom. See section 2.8.3 for node numbering order and order of faces. The element features are summarized in Table 54.
Keyword  QBrick1ht 
Description  Isoparametric, hexahedral 3D element with quadratic approximation for heat transfer problems 
Specific parameters  [NIP #(in)] 
Parameters  NIP: allows to change the default number of integration point used, possible values are 8, 27 (default) and 64. 
Unknowns  Single dof (T_f  temperature) is required in each node. 
Approximation  Quadratic approximation of temperature and geometry.. 
Integration  Integration using gauss integration formula in 8, 27 (default), or 64 integration points. The default number of integration point used can be overloaded using NIP parameter. 
Loads   
Features   
CS properties   
Status 

The same element as QBrick1ht for heat and mass (one constituent) transfer problems. Two dofs (T_f  temperature and C_1  concentration) are required in each node. Linear approximation of temperature and mass concentration. Other features are similar to QBrick1ht element, see section 3.3.4.