Talk, SIAM CSE 2023, Amsterdam, NL
Discuss improvements in parallel scalability of high-order preconditioners through James Lottes’s novel fourth-kind Chebyshev polynomial smoothers.
Talk, CEED Annual Meeting 6, UIUC
Demonstrate improved convergence rate using novel 4th-kind and optimal 4th-kind Chebyshev smoothers based on Lottes’s work Optimal polynomial smoothers for multigrid V-cycles. In addition, analyze the applicability of one-sided V-cycles to improve the convergence rate of Chebyshev smoothers in both a high-order $p$-multigrid and finite difference geometric multigrid applications.
Talk, SIAM PP 2022, Virtual
Compare strong/weak scalability of various $p$-multigrid preconditioners and low-order operator preconditioning. A nascent tuning strategy is proposed to help alleviate the difficulty of choosing a reasonable preconditioner for a given problem.
Talk, Copper Mountain 2021, Virtual
Present novel $p$-MG preconditioner built on Chebyshev-accelerated additive Schwarz and restrictive additive Schwarz smoothers. These preconditioner techniques are now the default solvers utilized in nekRS, an open-source high-order CFD solver targeting GPUs.
Talk, SIAM CSE 2021, Virtual
Present novel $p$-MG preconditioner built on Chebyshev-accelerated additive Schwarz and restrictive additive Schwarz smoothers. These preconditioner techniques are now the default solvers utilized in nekRS, an open-source high-order CFD solver targeting GPUs.