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MikeMcMullen
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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.
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Will Paraview in this context work with Windows?
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I believe the Calculix manual describes this in 6.9.7 of the CCX_2.19 manual. I think this is only in Explicit analysis. And yes there needs to be mass to use mass scaling. I have not gotten into explicit analysis in calculix yet as I am still ru…
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In practice here in the US, for civil structures, especially bridges, torque is not used directly. Calibrated crush washers, turn of the nut, or torque jobsite determined on a sampling of bolts and nuts with the same grip, washers, batch, using a h…
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My experience too. Now when running huge problems in Calculix (2,000,000 nodes +) it will trim itself down to under 2 GB from 8GB or so at the start. Yeah Victor!
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I had a sucesssful rin witn Mecway internal (Spooles I think) with about 4.3 million nodes. Worked OK if you have a day and night for a run. Screen sluggish viewing results too. MKL Pardiso will run non-lin on 2 Meg of nodes in about an hour.
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My experience with out of core and an SSD is that the bandwidth required is within the capabilities of a SATA SSD. Apparently a lot of overhead in the operating and Callculix or Mecway with the writing. What seems to work though is the freeing up …
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3rav--- I am successfully running your 31 August version of ccx with pastix thanks to your instructions, but it gags on 1, 890,000 nodes in iteration 1. I believe this is due to nnz being about 6.9 GB. Reading in the Pastix documentation it gives …
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Seems to work (running now pastix) on yesterday's release.
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I have a long list of ccx.exe files. They are all different depending on what was included in the compilation. Some don't work for me. Whatever Victor provides works, but is not the bleeding latest. Paradiso is proprietary, so he can't provide i…
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I saw prop_designs intermittant multi core use with earlier versions last year.
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4 Threads Pastix (25 wrz 2020 08:54:48 Windows from 3rav) shown above, about 3 seconds slower than 8 threads. 6 threads a tad less than 8 threads. 5 threads a tad worse than 4. CPU utilization a function of # of threads for either verision of CCX.…
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OK, Mecway 14 Static 3D, Out of core of a 1 span prestressed girder bridge with Hex20 elements. Mostly 8 elements thick for analysis of rail impact loads from a 36000 kg truck. 929180 elements, 4083375 nodes. Run using 4 cpu's of a Ryzen …
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Last run mentioned was 3:11:33 run time. Trying a slightly larger version of the problem 4588000 nodes failed with a P-2 message at the start of solving the Matrix at 46:00, decreased to 4083375 nodes, but with probably a significantly wider bandwi…
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Mecway 14 using intermal solver may be a good choice for linear large problems. I just reran one of my problem sets, and then changed all the elements from Hex8 to Hex20 drastically increasing the problem size. Using 4 cores: Hex8, 391680 element…
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Yeah, and I use windows. My last update was a compile with the latest MKL paradiso which required a Linux shell (I used msys2-Shell), a makefile, all the pieces, and a lot of intel files direct from intel. My first compile in many a year. A littl…
