Linking simulation codes is an increasingly important workflow for multiphysics simulations. &nbsp;&nbsp;Different codes have different functionality and different regimes for which they have been optimized.&nbsp; Linking codes means leveraging the models available in each code and being able to have additional combinations of physics by using different codes.&nbsp; The question then arises of how to perform verification and validation activities on linked simulations.&nbsp; One key concern is ensuring that the physics models on all sides of the link are compatible enough at link conditions that a smooth simulation continuation is possible. &nbsp;The link itself may also introduce additional uncertainties and even numerical errors.&nbsp;The LANL Lynx team has been working on how to pass information via fields on meshes between codes. With the software package Zelda mature enough to reliably remap fields like density and stress from mesh suitable for Abaqus to mesh suitable for FLAG (a LANL Lagrangian finite volume code), we have turned our attention to material models and what needs to be done to ensure that the fields are consistent enough for a smooth simulation continuation. The scientific question under exploration is exactly what “consistent enough for a smooth simulation continuation” means in a V&amp;V sense.We chose a Taylor cylinder of cerium running into an infinitely hard wall as our test case. Cerium has a complicated enough phase diagram to show some interesting behavior during the simulation, which allows us to explore the effect of link conditions upon continuation.We have used two strength models in Abaqus for this initial exploration: (a) tabulated stress-strain curves generated from the Preston-Tonks-Wallace model at multiple temperatures and strain rates and (b) an elastic-perfectly plastic model.Preliminary results indicate that these two models are sufficiently different for us to observe discrepancies during link time as well as comparison to a system run fully in FLAG. This work will show effects of link time and the strength model chosen for simulations run in FLAG.&nbsp;

Linking Material Models Between Codes: Example of a Cerium Taylor Cylinder

Paper Proceedings: https://asmedigitalcollection.asme.org/VVS/VVS2021/volume/84782

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