Integration of [Kee et al. 2023]: "An Optimization-Based SPH Solver for Simulation of Hyperelastic Solids" #372
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…L-BFGS; validating line search
…ion, SVD polar decomposition fix - L-BFGS: runtime window size change with buffer renewal; window=0 for constant Hessian - Line search: backtracking Armijo + flat energy termination (|dE| < 1e-4); convergence check before LS - SVD polar decomposition: flip U.col(2) instead of R.col(2) for correct R under inversion - Non-convergence warning at max iterations - Kugelstadt2021: added neighbor list asymmetry check - Beam.json: updated scene config for validation
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Features:
Performance (beam twisting benchmark, ~9K particles, Poisson's ratio = 0.49):
Bug fix:
Fixed an asymmetry issue in neighbor list handling: when the maximum neighbor count is limited (default 15), particle i may include j as a neighbor while j does not include i, causing unbalanced elastic forces and violating momentum conservation. The beam benchmark requires up to 43 neighbors.