Stuck? 
support@mecway.com
support@mecway.com
Mecway
FEA
Victor
About
- Username
- Victor
- Joined
- Visits
- 4,723
- Last Active
- Roles
- Administrator
Comments
-
Fantastic bug report, ehoule! This has been a very elusive problem before but hopefully I'll be able to get it solved using this reproducible example.
-
I don't think it's possible to do that in Mecway. If it were static with hydrostatic pressure, you could use a low Young's modulus (hence low shear modulus) and a Poisson's ratio near 0.5 such as 0.4999 but that doesn't sound like it would work corr…
-
Hello JL82. You can do it using *RIGID BODY like this: * Change Analysis settings -> Solver to CCX. * Add a node on the axis of the pin. * Create 2 node selections for the 3 hole surfaces. * Add a CCX -> custom model definition contai…
-
There's no complete API. But there is: Python API for scripts run from Mecway that currently covers: * Simple operations on nodes and elements * Read data from the solution * Measurement tools that integrate over elements or faces * Read t…
-
Thanks. I don't want to study it too much but that adds a little clarity to something that I never quite understood - how materials with different mechanisms for storing thermal energy can manage to completely transfer it between each other and reac…
-
Oh, that's interesting about the cause of thermal resistance. Thanks for confirming the name is OK. It looks like "thermal conductance" would have been alright instead of "thermal conductance per unit area", but hopefully the extra words add more cl…
-
There isn't yet an easy way to modify the loads but you can write an external script that generates a .liml file with the loads, runs Mecway using the command line parameters to solve and exit, then reads the solution, possibly from a .csv file. Do…
-
Yes, that's fine. If the response is independent of load history, then it's equivalent to many separate solves, otherwise, time just determines the sequence of loading so it's probably still suitable.
-
These large deformations with contact can be finicky. It sometimes helps to turn off automatic time stepping and use a small time step. Also, make sure the pipe is fully constrained, perhaps at its other end, so that when the contacts let go, it's…
-
No plans for integrating *STEP into the GUI.
-
Hello pschwenn. Best to try the CCX group https://calculix.discourse.group/ But since you're here, a couple of general ideas to bear in mind: A solution that looks continuous is consistent with a discontinuous one for small enough discontinuities…
-
Thanks for sharing. To be honest, I'm never quite clear on the definitions of all those TCCs and CTCs and all that. I named the parameter using what I hoped was the more obvious term "thermal conductance" (=1/thermal resistance). But it turns out t…
-
Works fine in CCX 2.16 but not 2.17. I'm not sure what's wrong but it seems like a bug so it might be better to isolate it post on the CCX forum.
-
That scrolling back to the top is a bug, sorry. It can help if you collapse parts of the tree to keep it within the window.
-
Oh, yes. Maybe my 3 replies were lost on the way. I'll resend from alternative account.
-
I've never seen that before except the situation JohnM described where the bad elements have nodes moved by the *TIE or elastic bonded contact. Perhaps you can send me the model privately to investigate?
-
Turn off View -> Show element edges and Show element surfaces so only the selected element is visible.
-
Named loads - yes Multiplicative constants - probably but it might be in the form of constants you can include in load formulas and not quite as visual as what's shown on your screenshot. Load groups - maybe Country specific input format - It's a…
-
Some possible reasons: A ) If stress is listed in the outline tree but has no data, it may have failed to converge. In that case, it sometimes shows the final displacement without stress. B ) If stress isn't shown in the outline tree, add it throu…
-
If this is not too simple, you could substitute the pin with pressure, force, or normal displacement (under frictionless support) on the arms and use fixed support or displacement constraints at the location where it's being pulled. I would use 3D w…
-
I expect CCX will be more accurate. If it's treating them analogously to external force, then it should be accurate regardless of mesh density, but if it's using the temperature gradient like Mecway does, you need to check for mesh convergence by re…
-
It may be a bit too rough to integrate the heat flux magnitude since it can include some component tangent to the surface or in the opposite direction which won't be counted properly. The error seems to be in the wrong direction for that though so …
-
If you don't open the solver window, or press Hide, it can be much faster because of not displaying those messages. You can just open it when you want to check then hide it again. I'm not sure if that's still slower than CCX on its own though.
-
Edit -> Create -> Element has an option for choosing the component. Most other tools that create new elements from existing ones (extrude, copy, etc.) follow the component of the existing element. But Quick cube, Quick square, Plate mesh, Cur…
-
The internal solver uses either of two eigenvalue solvers depending on the size of the model: 500 DOFs or more: ARPACK's Implicitly Restarted Arnoldi Method which is similar to Lanczos since the matrices are symmetric (except for cyclic symmetry wh…
-
You can store units in the default model by having some unused thing there with those units, such as a material with thickness of 1 mm. Then it will use mm as the default for new things like STEP file meshing parameters. I'm also wondering about ma…
-
You mean to find the damped natural frequencies? Neither solver has that capability, sorry. I'm not sure why, other than perhaps it's difficult to implement and not widely needed.
-
I think that would work. Or you could replace ccx.exe in Tools -> Options -> CalculiX with a .bat file that starts it. Then when you close Mecway, CCX should keep running. Beware though that doing these things will lose some data that's not i…
-
Here you go. I made these changes: * Used Mecway's spring and damper materials instead of defining the CCX cards by hand. Those get generated automatically. * Changed the analysis type to Dynamic response 3D * Added density to the beam materi…
-
Mecway doesn't participate in the solving with CCX so that memory is just what it uses for its internal data and things. If you're really tight on memory, you might need to save the model as .inp, close Mecway, then run ccx on that directly instead …
