| Author | Message | |||
     P Han (maccivil) New member Username: maccivil Post Number: 1 Registered: 02-2008 |
Dear Robert: I am new a user of flexPDE. When I run a very simple plane stress analysis of a plate under tension, I noted that when the the governing different equations are slightly modified by deviding a constant on both sides of the equation, the results are completely different. As you can find from the attached script, Set 2 and Set 3 of the equations are in fact identical, however, I don't get correct results when using Set 2. Could you please advise how this happens? Thank you very much for your help.
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| Robert G. Nelson (rgnelson) Moderator Username: rgnelson Post Number: 1062 Registered: 06-2003 |
In the Help Section "Technical Notes->Natural Boundary Conditions", we say: ----- If the PDE is multiplied by some factor, then the associated NATURAL boundary condition must be multiplied by the same factor. ----- "Load" is simply a pseudonym for "Natural". Your sets 2 & 3 are not, in fact, identical. They differ by a multiplying factor. You must also multiply the Load boundary conditions by this factor. Re-read the documentation on Natural boundary conditions. |
