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Welcome to Discourse
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0
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3632
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July 28, 2020
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Discord server for PrePoMax / CalculiX and GitHub repo with validation cases
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3
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201
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November 8, 2026
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Norton *CREEP in a linear *VISCO step: a large increment stops ccx with "matrix found to be singular" (exit 255) instead of a cutback
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10
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129
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November 7, 2026
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Advocating for a no-AI/no-LLM policy for CalculiX
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11
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106
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November 6, 2026
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Mitigating Jacobian Negativity & Sliver Tetrahedra When Importing CAD STEP/STL Meshes in CALCULIX Workflows
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1
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40
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November 6, 2026
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Ccx 2.23: 12 further issues, one per reply below (all still present on master 537aa81)
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14
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71
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November 5, 2026
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CalculiX User Meeting 2026
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10
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1174
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November 5, 2026
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Global moment equilibrium issue with TIE connections between thickened shell meshes v2
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4
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71
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November 4, 2026
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Mortar contact pair
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11
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586
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November 4, 2026
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*ORIENTATION: a *DISTRIBUTION name that reads as a number (D1, E1, E5, 12, ...) is taken as zero coordinates, and the run stops with only "matrix found to be singular"
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4
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77
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November 4, 2026
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A linear step followed by an NLGEOM step: beams and shells with rotational SPCs stop with "*ERROR in meanrotmpc: MPC has wrong number of terms" (exit 201)
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2
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37
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November 4, 2026
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*CONTACT PRINT CF / CFN / CFS segfaults in a *BUCKLE or *STEADY STATE DYNAMICS step (face-to-face pair, elastic material; own or carried request)
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2
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30
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November 4, 2026
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Axisymmetric model with node-to-surface contact: *EL FILE S plus *CONTACT FILE aborts with SIGABRT and no message (double free in frdcyc.c)
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2
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31
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November 4, 2026
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*EL PRINT ELKE in a linear *STATIC or *BUCKLE step: segmentation fault (resultsmech.f reads the velocities, which linstatic.c and arpackbu.c pass as NULL)
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2
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39
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November 4, 2026
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*SECTION PRINT: FREQUENCYF= does not change how often SOF or FLUX are printed in a mechanical or heat-transfer step, and FREQUENCY= is "not recognized"
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2
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36
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November 4, 2026
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Extrapolated nodal values (S, E, ENER, *SECTION PRINT) of C3D8, C3D8I, C3D20R and expanded 2-D/shell elements are 4e-5 low: the 2x2x2 table in extrapolate.f has 4-digit constants
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2
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27
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November 4, 2026
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*MODEL CHANGE toggles elements: ADD switches an active element off, a second REMOVE switches it back on; GENERATE element sets are misread (random segfault)
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2
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24
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November 4, 2026
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Node-to-surface contact: a slave surface with many faces (e.g. a whole body) overflows the slave-face arrays in inicont.c: wrong forces, hangs or crashes
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2
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32
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November 4, 2026
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Thermal contact: pressure-dependent *GAP CONDUCTANCE is evaluated at the wrong contact pressure (node-to-surface LINEAR/TABULAR, face-to-face TABULAR)
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2
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32
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November 4, 2026
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*PLASTIC, HARDENING=KINEMATIC / COMBINED without NLGEOM: the back stress is updated with the wrong sign, so a tension test softens
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2
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31
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November 4, 2026
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Norton *CREEP with isotropic *ELASTIC: A·t^m is floored at 1e-20, so laws in Pa and s creep too fast and the result depends on the unit system
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2
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30
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November 4, 2026
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Linear *STATIC: SPRING1 / SPRING2 forces caused by a nonzero *BOUNDARY are left out of the load vector, so a SPRING2 from a moved node transmits nothing (exit 0)
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2
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43
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November 4, 2026
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*TRANSFORM is ignored for rotations at shell knots and *KINEMATIC reference nodes; *EQUATION terms on DOF 5/6 of a transformed node are misread
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2
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32
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November 4, 2026
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NLGEOM: an *EQUATION tied to a *RIGID BODY member is not satisfied after a large rotation (also why an identity ORIENTATION changes a *KINEMATIC coupling)
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2
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27
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November 4, 2026
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Steps without NLGEOM that ccx iterates (e.g. an unreached *PLASTIC): *RIGID BODY, *KINEMATIC and mean-rotation MPCs use finite rotations
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2
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29
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November 4, 2026
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NLGEOM is lost after a *FREQUENCY or *BUCKLE step: the next *STATIC step runs geometrically linear unless its *STEP card repeats NLGEOM (exit 0)
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2
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40
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November 4, 2026
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*MODAL DAMPING: the ratio table is sized by the deck's last card (out-of-bounds write, SIGABRT), and RAYLEIGH discards later ratio cards and the *DAMPING values
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2
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28
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November 4, 2026
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*DYNAMIC, EXPLICIT: spring elements are left out of the stable time increment, so a stiff spring makes the solution grow without bound (exit 0, no message)
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2
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31
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November 4, 2026
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Implicit *DYNAMIC (and transient *COUPLED TEMPERATURE-DISPLACEMENT) runs CPE4, CPS4, CAX4, CPE8R, CPS8R and CAX8R elements with half their mass
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2
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44
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November 4, 2026
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CalculiX and LIS solver
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18
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423
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November 4, 2026
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