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Grounded scalar springs: CELAS1-4 with one point blank or 0 connect the other point to ground - #332
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…he other point to ground A spring with one point blank (or 0) is a spring to ground. MYSTRAN did not take it: CELAS1/CELAS2 stopped on the blank component (ERROR 1133), CELAS3 on the blank point (ERROR 1021), and CELAS4 later with "GRID 0 NOT DEFINED" (ERROR 1900). Grounded springs are common: soft mounts, and springs that hold the rigid-body modes of a free model. - Subr ELAS_GROUND_END (SPRING_BUSH_MASS.f03), called by BD_CELAS1-4: the element keeps its point first. - A blank first point swaps the two ends. - Point B becomes 0, or -1 when the ends were swapped. - Errors: ERROR 1218, no point; ERROR 1219, a component at the grounded end; ERROR 1220, a negative point. - CELAS1/CELAS3 skip the "> 0" check of point B only for a grounded spring. - CELAS1/CELAS2: a blank or 0 component is accepted, as the component of a scalar point. ELMDAT1 already turned it into 1 there, and stops with ERROR 1950 when it is on a grid with 6 components. - GET_ELGP: an ELAS with point B <= 0 has 1 grid point, so the lookups, DOF lists, assembly, node forces and grid point force balance see only its real point. - ELMDAT1: ELAS_COMP is read for the element's points only. ELAS_COMP(2) = point B (0 or -1) marks the grounded end. - ELAS1: a grounded spring has the 1 x 1 stiffness K. Its engineering force keeps the sign of the entry as written, K*(UA - UB) with the ground displacement 0: K*UA, or -K*UB when point A was the grounded end. - ELEMENT_RECOVERY_SUPPORT: the node force of a grounded spring is K*UA. Test (MYSTRAN_Validation): celas4_grounded.bdf, CELAS4,1,10.,1001 (second point blank) with a unit load on 1001: u = 0.1 (hand value). Current dev stops with ERROR 1900.
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Fixes #331.
One commit, in
SPRING_BUSH_MASS.f03,ELEMENT_LOOKUPS.f03,ELEMENT_DATA_GATHERING.f03,SPRING_ELEMENTS.f03andELEMENT_RECOVERY_SUPPORT.f03.Test: MYSTRAN_Validation MystranSolver/MYSTRAN_Validation#42,
celas4_grounded.bdf: CELAS4,1,10.,1001 with a unit load on 1001.dev: ERROR 1900. With this PR the checks pass.Also checked on this commit alone, outside the suite:
devdoes not have.Validation suite: with both PRs, 1 failure of 3,256 checks, the same one current
devhas without them ("mitc4 thermal strain free rectangle cylinder"). The new check passes.