| Author | Message | |||
     Ranjan Radhamohan (mrranjan2) New member Username: mrranjan2 Post Number: 1 Registered: 07-2004 |
Hello, I've been having great success so far with FlexPDE, but I have one issue. I'm trying to add periodicity in the extruded dimension using the command PERIODIC EXTRUSION z = a,b,c. FlexPDE 4.0.7a reports: Memory Protection Fault ---Called from mesher3::build_3d_domain ---Called from mesher3::grid3d ---Called from control::do_gridgen ---Called from ccontrol::runphase ---Called from ccontrol::control_loop or Unknown Exception! ---Called from mesher3::build_3d_domain ---Called from mesher3::grid3d ---Called from control::do_gridgen ---Called from ccontrol::runphase ---Called from ccontrol::control_loop There is no overlap in the model I've constructed, i.e., the extruding arcs and beam hole on the top and bottom layers are each only 1/2 the depth of the full piece. I'm pretty sure the two surfaces match, so I don't know what the problem could be. Do you have any suggestions? Thank you very much, Ranjan
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| Ranjan Radhamohan (mrranjan2) New member Username: mrranjan2 Post Number: 2 Registered: 07-2004 |
Hello, I was also wondering how to add a phase shift to the TWT cavity. Is this possible using periodic boundary conditions? Thanks again, Ranjan P.S. If it's important, I'm an intern at NASA Glenn using my mentor's dongle and software. | |||
| Robert G. Nelson (rgnelson) Moderator Username: rgnelson Post Number: 180 Registered: 06-2003 |
With Periodic boundary conditions, FlexPDE tries to match up the boundary definitions on the periodic faces. It is being confused because, in your case, some of those boundaries are by implication absent. But specifying a periodic extrusion is meaningless here, because you have already defined value boundary conditions on those faces, so the solution is already "periodic". As far as generating a phase shift by periodic boundaries, I fail to see how it would have that effect. You have to go to the mathematical statement of the problem and enter terms to create the phase shift. | |||
| Ranjan Radhamohan (mrranjan2) Junior Member Username: mrranjan2 Post Number: 3 Registered: 07-2004 |
I think I posed my second question incorrectly. Is it possible to apply a phase-shifted periodic boundary condition? Thank you for your help, Ranjan | |||
| Robert G. Nelson (rgnelson) Moderator Username: rgnelson Post Number: 187 Registered: 06-2003 |
You can select periodic or antiperiodic (sign reversed) conditions, but you cannot apply arbitrary shifts to the periodic values. |
TWT