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DOE OSTI · 3434792

mLaSDI: Multi-stage latent space dynamics identification

Anderson, William [Lawrence Livermore National Laboratory]·Chung, Kevin [Lawrence Livermore National Laboratory]·Choi, Youngsoo [Lawrence Livermore National Laboratory]·Stephany, Robert [Lawrence Livermore National Laboratory]
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Anderson, William [Lawrence Livermore National Laboratory], Chung, Kevin [Lawrence Livermore National Laboratory], Choi, Youngsoo [Lawrence Livermore National Laboratory], Stephany, Robert [Lawrence Livermore National Laboratory]. 2026-07-02. mLaSDI: Multi-stage latent space dynamics identification. https://doi.org/10.1016/j.cma.2026.119173

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DOE OSTI2026

High-Order Mesh r-Adaptivity with Tangential Relaxation and Guaranteed Mesh Validity

High-order meshes are crucial for achieving optimal convergence rates in curvilinear domains, preserving symmetry, and aligning with key flow features in moving mesh simulations [1], but their quality is challenging to control. In prior work, we have developed techniques based on Target-Matrix Optimization Paradigm (TMOP) to adapt a given high-order mesh to the geometry and solution of the partial differential equation (PDE) [2, 3]. Here, we extend this framework to address two key gaps in the literature for highorder mesh 𝑟-adaptivity. First, we introduce tangential relaxation on curved surfaces using solely the discrete mesh representation, eliminating the need for access to underlying geometry (e.g., CAD model). Second, we ensure a continuously positive Jacobian determinant throughout the domain. This determinant positivity is essential for using the high-order mesh resulting from 𝑟-adaptivity with arbitrary quadrature schemes in simulations. The proposed approach is demonstrated to be robust using a variety of numerical experiments.

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