| Author | Message | ||
     Peter Rubovic (peto) New member Username: peto Post Number: 1 Registered: 10-2009 |
Hello, I try to solve simple third order equation which solution is quadratic function.FlexPDE cannot directly solve more than second order equations, so I divided equation DXXX(f)=0 into two eqations (I'd like to solve it in 1D): 1st: DXX(f)=g 2nd: DX(g)=0 What I get is error notification ('0=0') or breakdown of FlexPDE. Has anybody encountered this kind of problem? Thank you in advance. | ||
| Robert G. Nelson (rgnelson) Moderator Username: rgnelson Post Number: 1301 Registered: 06-2003 |
The diagnostic means that one or more of your equations has collapsed to 0=0. That is, all of the coefficients of the variables have vanished. Since you have not posted your script, we cannot comment on what might be the cause. But if you examine your equations and substitute the initial values and parameter definitions, you will probably see immediately why one or more of the equations evaluate to 0=0. Our examples Free_Plate.pde and Fixed_Plate.pde in the "Samples|Applications|Stress" folder ("Samples|Steady_State|Stress" in version 5) demonstrate a similar splitting of variables. |