Highlights
Thru the Euler and ALE capabilities RADIOSS is brightly used for fluid structure interactions. In Version 14.0 improvements have been brought in the multi-material regarding the compatibility with the far field boundary conditions. A significant added value lies on the compatibility of the Tetra4 elements with ALE.
New TETRA4 element (Itet=3) compatible with ALE, reducing the volumetric locking.
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| • | Drücker-Prager yield criteria introduced. (/MAT/LAW51 – Iform=11). |
| • | Possibility to define relative pressure for inlet material boundary: PEXT (Iform = 4 or 5). |
| • | /INIVOL card is now compatible with boundary elements (Iform = 2 or 3). |
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/MAT/LAW5 and /MAT/LAW51: Burn fraction method for JWL EOS can be defined using IBFRAC flag. Usually two functions are evaluated: one is based on time, the second one is based on volumetric compression. The maximum of the two functions is used by default to set burn fraction value. Now the user can deactivate one of them. This especially enables to keep only function based on time control to get rid of erroneous ignition in some specific cases.
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| • | Degenerated pentahedra now compatible with /SUPG. |
| - | Possible time-step drop (Iform = 2, 3) due to Strain Rate incorrect value. |
| - | Possible Engine failure with negative density (rho=NaN) for unused submaterial in inlet/outlet formulation. |
| - | Possible Engine failure at cycle 0 on Windows. Issue occurring when using plasticity models with MM-ALE (Multi-Material-ALE) LAW51. |
| - | No strain rate dependency with JCOOK criteria. |
| - | Deviatoric stress is now taken into account for outlet frontier (Iform=3). |
| - | Fixed strain rate & temperature dependency in Johnson-Cook criteria when used with MM-ALE. |
| • | /INIVOL not working correctly when surface is defined with mixed 3N and 4N shells. |
| • | Multiple /INIVOL cards not working (last one overwrites previous ones). |
| • | /INIVOL: possible failure on Windows platform. |
| • | Drücker-Prager material LAW10 and LAW21. |
| - | Artificial Viscosity was not taken into account while computing energy integration from EOS numerical solving. Might affect numerical result unless user sets artificial viscosity to 0: qa=qb=1e-20. |
| - | Wrong Drücker-Prager behavior in tension: |
| ▪ | 1- Yield surface was symmetrized around fracture point, while there shouldn’t be any yield criteria below this point. This might affect numerical results since Yield surface was fixed |
| ▪ | 2- If Yield surface is mathematically not well defined user is warned |
| - | Introduction of PEXT parameter. User can now input EOS written in relative pressure formulation: new PEXT parameter enables to get correct energy balance. |
| - | Detonation wave velocity faster than expected results. ALE rezoning issue was fixed. It was computed only if second submaterial in input card required it. |
| - | Possible engine segmentation violation error if /ANIM/ELEM/VFRAC is used. |
| • | Rotations can now be imposed on Lagrangian nodes merged to an ALE element. |
| • | Error not returned when LAW3 format is the old v10 one: Using material card format 10.0 leads to error message in input files 110 120 130. |
| • | Warning message is issued if old format of LAW3, LAW4 and LAW49 is used. |
| • | /MAT/LAW37: Starter checks for massic liquid proportion out of range [0,1] and initial densities < 0. |
| • | Reinforced concrete material LAW24: Check the warning "increment too big on element ###" for LAW24 material elements in engine. Fix of Possible high occurrence of Warning message about too big increment on load path. |
| • | Possible read error with /CAA option, if /IOFLAG or /ANALY card was not present. |
User comfort (Input/Output/Manual)
| • | Manual for material law 11 (/MAT/BOUND) was rewritten to provide better understanding of different options (non-reflecting frontier(NRF), general outlet, inlet from stagnation condition, etc.) |
| • | Improved user readability in output files for ALE keywords: listing outputs and documentation are now consistent. |
| • | FSI interface 18 (/INTER/TYPE18) has no longer Istf flag. It is now removed from input card and the manual since it is now automatically set to 1.0. Other values led to error message about NEGATIVE STIFFNESS NODE. |
| • | Starter is checking if a Lagrangian element is connected to an Eulerian one. Warning message is printed in this case. |
| • | Surface defining elementary boundary condition (/EBCS) is now checked by Starter Warning messages are printed, if necessary. |
| • | Initial pressures for law 51 submaterial are printed in Starter listing file. |
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