Abstract
Over the past few years, the CTH multiphysics hydrocode has overhauled its software quality and testing processes, implementing current best practices in software quality and building a robust V&V test suite comprised of traditional hydrocode veri?cation problems, including ASC Tri-Lab Test Suite [1] and Enhanced Tri-Lab Test Suite [17] problems, as well as validation problems for some of CTH?s most frequently used equations of state, materials models, and other key capabilities. Substantial progress towards building this new test suite was made in FY19 and FY20 (see [4] and [5]). In FY21, the test suite has been expanded to include veri?cation and validation tests of the Steinberg-Guinan-Lund (ST) viscoplastic model and the Johnson Cook (JFRAC) fracture model. Additionally, two new veri?cation tests were added, covering hydrodynamics and high explosive (HE) modeling capabilities: the Kidder Gaussian density problem and the Escape of HE Products (EHEP) problem from the Tri-Lab Test Suite. This report discusses each of these test problems in detail. Veri?cation test results are compared to analytic solutions. Validation test results are compared to experimental data. Wherever possible, convergence or mesh re?nement studies are included. Additionally, while implementing the Kidder veri?cation problem, a bug was identi?ed that affects the use of tables to initialize pressure or density in 1D or 2D calculations. A brief discussion of the bug and its ?x is included. CTH demonstrates good performance overall on the new test suite problems. Simulation results showed good agreement with analytic solutions for the Kidder problem, with convergence rates ranging between 1 . 8 and sub-linear, and relatively good agreement for the EHEP problem, though convergence rates for pressure and density were nearly 0. The ST and JFRAC strain rate loading veri?cation tests show good agreement with analytic solutions. Likewise, CTH simulation results show good agreement with experimental validation data, including Taylor rod impact testing, for the materials tested. Future V&V work will focus on adding 2D and 3D versions of existing veri?cation tests as well as adding validation tests of other frequently used capabilities such as other fracture models.
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