| Author | Message | ||
     Victor Bense (indiana) Member Username: indiana Post Number: 12 Registered: 01-2005 |
Can different values for ERRLIM be set for different variables? For example can I request remeshing for temperature if it drops below a certain errlim but not if pressure drops under the same limit? | ||
| Robert G. Nelson (rgnelson) Moderator Username: rgnelson Post Number: 540 Registered: 06-2003 |
The error limit ERRLIM refers to relative error in the variables, not the absolute error. So the default value of ERRLIM=0.002 (version 5) means an absolute error of 0.002 units in the variable if the range is 1, and an error of 2 units in the variable if the range is 1000. The relative error control applies to all variables, and cannot be set separately. But the error is measured relative to the larger of the observed range or the stated THRESHOLD. So by declaring a large THRESHOLD on one variable, you can effectively degrade the error control tolerance for that variable. In a coupled problem, sloppy error control on one variable could be expected to feed back into the other variables and degrade their accuracy. |