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Victor
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Comments
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Beam elements can capture global buckling and perhaps you can use the internal forces and bending moments from the solution to find local buckling using hand calculations in a spreadsheet or the formula feature in the solution? If you do use solids…
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I wouldn't have much hope for 8 million nodes on 32 GB of RAM, or even with any amount. I'm not sure what the limits really are but it depends on the matrix solver (Pardiso/Pastix/Spooles) and amount of RAM. It sounds like you should be using shell…
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Yes, you can't currently build a model from scratch with the API. Maybe start with one having placeholder loads? The API isn't frozen, and I'm frequently adding to it to make it more complete. It was a late addition to Mecway that hasn't caught up …
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Two ways: Python script like you suggested: * Easy to modify some aspects of the model such as node locations and most load values but not everything is available through the API. * Access to some tools like mesh refinement and integration of …
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That's great you found a solution. set the higher-spec computer to 24 processors rather than 36 Perhaps I should get Mecway to limit number of threads. 24 is probably way too high to give any speed advantage.
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Some ideas: 1. This first one is only relevant if you're using CCX compiled from the source in Mecway. Mecway versions 19 and earlier restricted the in-core memory available to Pardiso to 14.4 GB. I don't think you're using this and shouldn't. Ve…
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You could move the shell nodes to join with the beam nodes and use Shell offset (in Element properties) to position the shell midplane at the correct distance. Alternatively, you can generate all the beam elements quickly by selecting the nodes and…
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You're right that those small radii cause it trouble. I got a solid mesh with the default meshing parameters. However, the small radius leads to a lot of badly shaped elements which you probably encountered. Ways to correct that: Turn off Fit mids…
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That means the material is used by shell elements. It looks like you have a surface mesh instead of a volume mesh. That can happen either by setting the Surface mesh option in Meshing parameters or if the mesher failed to make the volume mesh and le…
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Not really. There's node-surface coupling for the CCX solver which connects a node to a set of faces, making them all a single rigid body. There's also contact with the bonded and constraint equations options for face-to-face rigid connection whil…
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Does it happen with the sample files too or just one model? All I can suggest at the moment is to re-install Mecway. It could be caused by some file missing or corrupt, not necessarily mecwayd.dll but perhaps another dll it depends on.
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That sounds like what the cyclic symmetry constraint does. In case your geometry is different, like maybe linear periodic symmetry, then no.
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Structural damping is only for steady state dynamics (frequency domain) according to the CCX manual. In case you want to use steady state dynamics, it kind of is possible but a lot more work. Some people have described how on this forum.
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Thanks for posting that @disla. Response to your notes: 1 - Direction is away from the origin. Not sure what the reasoning behind this originally was but a more obvious first point to last point must have had some problem. 2 - The SCL direction itse…
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With the CCX solver, you have to use external force instead of reaction force, and it includes applied forces. For nonlinear dynamic, even external force isn't available in the list. This might be because it's incorrect in some way. I'm not sure. Y…
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@German you're right. There's a pop-up tooltip saying it but it's easy to not realize that's there. I'll add something.
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Wow that's really pushing the boundaries. I'm not sure about multiple custom model definition and custom step contents because if you unsuppress more than one in a configuration, Mecway has to make a decision about the order they're applied in. It …
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You can find it with Edit -> Select elements by... and enter its number. First thing may be to delete the element and see if the solver then complains about a different one. There might be many of them. You may see that it's distorted. If it's …
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You can do it by deleting the input model and start and end tags from the .liml file. It normally has this structure: [ Input model is here ...] [ Solution model is here ...] and would end up containing only these parts: …
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@Tibor yes, version 21 that's currently available has the 6 components in SCL coordinates, both linearized (membrane+bending/etc) and not linearized (total stress).
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I'm not really sure, sorry. However, it's risky to use node-surface coupling on beams and shells. There's a warning about that because sometimes it doesn't work. Since you have a structured mesh, you could make the fasteners from solid elements sha…
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You can set some convergence criteria using the *CONTROLS keyword for CCX. Add it in Mecway under CCX -> custom model definition. But really you shouldn't touch that unless your problem really is special and probably models some extreme physical…
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CCX can do that with *PRE-TENSION SECTION applied to a beam element. The GUI in Mecway doesn't support that mode (beam element instead of section faces) so you have to write the card(s) yourself.
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Hello Hengre. I don't think you're doing anything wrong. It's just that discretization error can be significant when integrating a field variable that changes rapidly over individual elements, as it does here. EDIT: The error is in the current densi…
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Wow, that's definitely a challenge. I'd be skeptical of any solution from that mesh with the high aspect ratios of the elements. If these are shells, make a quad-dominant mesh instead to reduce the node count. They'll likely perform better with th…
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I don't have any other ideas for improving the solver, sorry. 100 MB of STEP file sounds like a lot more opportunities to defeature it. Usually, there will be a lot of details like fillets or small holes that hog elements but don't affect the resul…
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Thanks for confirming that it's easy! A lot of people are put off by the idea of compiling things because it's notoriously frustrating and time-consuming. You don't need to set the MKL environment variables since Mecway does that when it calls CCX.
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I'm not sure about memory requirements, but your problem sounds like a similar size to kuhl's above and he seemed to need a little over 100 GB to avoid out-of-core. Without more RAM, you should compile MKL Pardiso CCX from the source included in Me…
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I removed the setting from v21 and made it effectively infinite. Do you have a model which can solve in v20 but not in v21?
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I got ccx_dynamic.exe 2.21 from dhondt.de to work by including all dlls from OneAPI 2023.0.0 from these two locations: C:\Program Files (x86)\Intel\oneAPI\mkl\2023.0.0\redist\intel64 C:\Program Files (x86)\Intel\oneAPI\compiler\2023.0.0\windows\red…
