Table of Contents
CONRA
Description
2D boundary. The element is used to model convection and radiation between the structure and the environment. It is defined by 1, 2, or 3 “real” nodes and 1 node representing the environment.
It can only be used with laws RACO and COPO1 (for pollution problems).
If the element is connected to a RAYON element, it must have 3 nodes.
For pollution problems, these elements must be defined last.
Type: 111 Implemented by: R. Charlier, 1982
Files
Prepro: CONRAA.F
Lagamine: CONRAB.F
Input file
| TITLE (A5) | |
|---|---|
| TITLE | “CONRA” in the first five columns |
| Line 2 (2I5) | |
| NELEM | Number of elements |
| NNODE | Total number of nodes (environment included) |
| Definition of the elements (5I5/4I5) | |
| NINTE | Number of integration points: 2 or 3 for NNODE > 2 1 for NNODE = 2 |
| LMATE | Material |
| NPOND | Ponderation index = 0 for classic use (law RACO1) = 1 for Upwind elements in a pollutant transport problem (law COPO1), in that case NNODE must be equal to 2: one node that belongs to the convection-diffusion elements (CONV2, ADVE2, ELAN2) and one environment node. |
| NCOEL | Number of elements related to true nodes (1 to 4) - see Note (1) |
| ICAS | For each NCOEL one must detail the topology of the related elements - see Note (1) |
| NODES | List of nodes (4, 3 or 2) see figure 1 |
Remark: For a Eulerian Lagrangian analysis of pollution, the environment node must be positioned outside the structure.
Fig. 1
Results
| Sigma(1) | First part of the total flux (convection + radiation taken by diffusion in the domain) |
| Sigma(2) | Second part of the flux (taken by convection in the domain) |
(1) Explanation on NCOEL and ICAS
- For the classic use: NCOEL = ICAS = 0
- For a Eulerian Lagrangian analysis of pollution, NCOEL = 4 and ICAS = 0
- For FUPG analysis of pollution, distinction between the following topologies:
| NCOEL = 1 1 solid element connected to the real node |  |
| NCOEL = 2 2 solid elements connected to the real node |  |
| NCOEL = 3 3 solid elements connected to the real node |  |
| NCOEL = 4 4 solid elements connected to the real node |  |
| 2 solid elements connected to the real node Treated like the case NCOEL = 4 & ICAS = 0 |  |