New features in Version 2.12 of CalculiX (check the documentation!)
Specific gas network elements (such as GAS PIPE FANNO) can be used in a purely thermal calculation (parameter THERMAL NETWORK on the *STEP card); in combination with the user subroutine film.f the heat transfer coefficient is determined by use of the Glielinski equation (cf. example beamhtfcnu.inp).
Improved the convergence of gas networks.
Updated the calculation of sensitivities (cf. *SENSITIVITY)
Coded *GREEN function calculations (response to unit forces at certain locations of the structure)
accelerated the reading of the global model in *SUBMODEL calculations.
Implemented the BEAM nonlinear MPC.
Coded *COUPLING followed by *KINEMATIC.
Coded *COUPLING followed by *DISTRIBUTING.
The GASPIPE network element was removed. Instead, the GASPIPE FANNO element should be used.
Coded the SPRING1 and SPRING2 element.
Coded the MASS element.
For shells a local coordinate system is automatically established by projecting the global or local (if defined by the user) x-axis on the shell surface.
Coded 6-node composite elements.
Updated the theoretical description of gas network elements.
Added the orientation in the dat-file for the quantities stored in local coordinates.
Coded *SECTION PRINT for the output of heat flux, section forces, section moments and section areas.
Included the relative stress error (heuristic relations) in the output of the error estimator ERR