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MikeMcMullen
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I routinely work with meshs of about 2M nodes (using quite a bit of page fileing). They take a couple of hours on my 64 GB machine, though I usually run non-linear which is much much slower than purely linear problems. At this size viewing mesh or…
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It appears that the problem runs OK, though convergence is iffy. I got the stresses etc to show. Problem was that element and model edges obscured the color. The deflection of bars is still iffy not being very close to the concrete they are attac…
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Seems to be a difficulty keeping the common nodes common between Mecway and CCX with the forced rectangular element which has the nodes at the corners of the shape, and the Mecway truss members which have the nodes along the CL. I will need to chan…
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I think I thought out what the problem is. I think video card latency as the model gets larger causes the existing node to not be found quickly on the second pick for the line 2 element creation. I am running a Nvidia 1660 Ti. Used to use a Ryzen…
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I will work on this a bit more. I think that issue may relate to the phrase "existing node". When I try to click on existing nodes, sometimes it selects an existing node, and sometimes creates a new one. I have no clue why one case and not the ot…
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4 to 6 x added nodes does not sound bad. I may try again. My main issues were difficulties generating the truss members, the bigger problem being not snapping on the second point, but treating it as a manual point location. that when located in th…
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I agree, but my thinking is that looking into the python used for the freedad examples may give a clue to what needs to be done in Mecway. I think the Freecad uses Calculix for this exasmple, but I am not sure.
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I think there is a similar example in FreeCAD. https://youtube.com/watch?v=VQINrNWdOHo
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I am probably never going to do this, but can you potentially show progress by using two instances of Mecway, one running the Iron python script to run the problems save them, and alter run and save again with an incremented name, and another instan…
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May be vaguely related to what I found running largish problems on my Ryzen 3700X, 8 cores, 16 thread, two channel machine. I found that assigning 8 cores/threads was slower than 6, and 4 only a few percent slower than 6, and more memory was needed…
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That location no longer works for accessing those DLLs, and the later fersion from 2023.1 or 2023.2 don't work for downloading, at least with a computer with an AMD processor. Older dlls work with other compiles. I have yet to try downloading from…
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Started playing with this yesterday. Internal solver is very fast. The CCX provided is not as it seems to single thread. Not your problem, but I also Looked at Calculix 4win2.21 and have difficulty with getting the appropriate MKL dlls for the dy…
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I think it is a limitation of the implicit solution process in general as often there is a problem with converging on a solution if the resistance does not increase at least a little with increasing strain. Therefore the material models are not per…
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14.4 GB was probably related to a point relevent to an 8 GB or 16 GB laptop with a slow hard drive.
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This may help me as well. 100 GB might have been faster simply due to never getting out of core. I dealt with some of these issues by increasing virtual memory which worked pretty well for problems needing up to 160% of available ram, above that g…
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If this uses the Pastix solver I had this issue a couple of years back. Someone (3rav?) did a recompile with i8 for me that corrected this. Otherwise use Pardiso with the intel speed ups. The advantage of Pastix seems to fade somewhat for larger …
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I am always careful not to post due to potential prior art. Lurk instead so I can pick up bits here and there. May get back to running some simpler FEM problems after a while. Buckling always interested me (especially plastic post buckling behavi…
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Buy two licenses. I did, but it was due to a very fatal CPU/MB crash, until Victor sent me an e-mail after I had purchased another, I had lost the KEY due to this crash. He offered to refund me the price of one of the keys, but I refused due to hi…
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Correct about Freecad, and I don't use it for that reason. Its method of just defining constraints and relationships has its virtues when the dimensions are unknowns, but I don't work that way. That is the part of the design process that I occupy.…
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Depends upon your problem size. The i8 only seems to be needed for problems over 500,000 nodes or so, so if you don't need it the i4 compile should be fine and perhaps a touch faster. It was a factor for me as my problems tend to run over 500,000 …
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Oh, I am quite familiar with these models and sometimes use them by hand or spreadsheet. They are not available in calculix, and I am not familiar with MFront enough to compile a material model for calculix and integrate it with Calculix. I do app…
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I am quite interested in progress on this. What I ran into is a lack of material models that model both compression and tension behavior of the arch. Also the actual behavior is not easily captured once there is some tension failure as the stiffn…
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A year or so ago I was having trouble with large pastix runs going into limbo (hang) and ran accros something in a dscourse about Pastix at the time that large problems could overflow the array counters. I think it was 3rav recompiled the windows v…
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Probably not, as Mecway is not open source (Victor may weigh in), though I believe it developed from what was at the time a simpler earlier project, Lisa, but has been expanded in capability since then, especially by easy linkage and function as a p…
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I believe the element properties are applied to the element, not the node. So if the stress in the element is under the tensile stress limit a corner could easily be over it. For a location where the stress does not vary drastically over the eleme…
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If I recall correctly the tension limit of the compression only material type is not linear, but more like a yeild stress of a metal like material, increasing gradually. I think this is so that the slight increase in stress with strain allows for c…
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You might be able to get by without calculus, but without algebra will be tough. If I were you and I had a non-mathematical background I would read up on Isaac Newton, and repeatedly reread the parts on the three laws of motion. Then I would read u…
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That looks useful. While the fabricator normally figures it, the distortion for steel girder welding has to be figured into plate cutting for bridge girders.
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Don't know. Haven't worked with blast. I believe a lot of the problem involves reflections as well as the inertial effects. Calcullix might be able to be tricked into doing this since it has fluid and gas flow capacities, but that would be out o…
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This could also be very helpful to me as well.
