Publications of Akwum Onwunta

Benner, P., Onwunta, A., & Stoll, M. (2019)A Low-Rank Inexact Newton-Krylov Method for Stochastic Eigenvalue ProblemsComputational Methods in Applied Mathematics, 19 (1), 5–22doi: 10.1515/cmam-2018-0030.

Benner, P., Dolgov, S., Onwunta, A., & Stoll, M. (2016)Low-Rank Solvers for Unsteady Stokes-Brinkman Optimal Control Problem with Random DataComputer Methods in Applied Mechanics and Engineering, 304, 26–54doi: 10.1016/j.cma.2016.02.004.

Benner, P., Onwunta, A., & Stoll, M. (2016)Block-diagonal Preconditioning for Optimal Control Problems Constrained by PDEs with Uncertain InputsSIAM Journal on Matrix Analysis and Applications, 37 (2), 491–518doi: 10.1137/15M1018502.

Benner, P., Onwunta, A., & Stoll, M. (2015)Low-Rank Solution of Unsteady Diffusion Equations with Stochastic CoefficientsSIAM/ASA Journal on Uncertainty Quantification, 3 (1), 622–649doi: 10.1137/130937251.

Benner, P., Onwunta, A., & Stoll, M.Fast Solvers for Optimal Control Problems Constrained by PDEs with Uncertain InputsPresented at: Computational Methods in Applied Mathematics (CMAM-7)Jyväskylä, Finland, July 31, 2016.

Benner, P., Onwunta, A., & Stoll, M.Block-diagonal Preconditioning for Optimal Control Problems Constrained by PDEs with Uncertain InputsPresented at: 87th annual conference of the International Association of Applied Mathematics and MechanicsBraunschweig, Germany, March 7, 2016.

Onwunta, A.Block-Diagonal Preconditioning for Optimal Control Problems Constrained by PDEs with Uncertain InputsPresented at: SIAM Conference on Uncertainty QuantificationLausanne, Switzerland, April 5, 2016.

Onwunta, A., Benner, P., & Stoll, M.Efficient solvers for optimal control problems constrained by PDEs with uncertain inputsPresented at: 20th Conference of the International Linear Algebra Society (ILAS)Leuven, Belgium, July 11, 2016.

Onwunta, A., Benner, P., & Stoll, M.Efficient solvers for optimal control problems constrained by PDEs with uncertain inputsPresented at: Workshop on Direct and Inverse Problems for PDEs with Random CoefficientsBerlin, Germany, November 9, 2015.

Onwunta, A., Stoll, M., & Benner, P.All-at-once Approach to Optimal Control Problems Constrained by PDEs with Uncertain InputsPresented at: SIAM Conference on Computational Science and EngineeringSalt Lake City, Utah, United States, March 14, 2015.

Benner, P., Onwunta, A., & Stoll, M.Low-Rank Solution of Unsteady Diffusion Equations with Stochastic CoefficientsPresented at: SIAM Conference on Uncertainty QuantificationSavannah, Georgia, USA, March 31, 2014.

Benner, P., Onwunta, A., & Stoll, M.Low-Rank Solution of Unsteady Diffusion Equations with Stochastic CoefficientsPresented at: 85th GAMM Annual Scientific ConferenceErlangen, Germany, March 10, 2014.

Onwunta, A. (2016)Low-Rank Iterative Solvers for Large-Scale Stochastic Galerkin Linear SystemsPhD Thesis, Otto-von-Guericke Universität, Magdeburgdoi: 10.25673/4440.

Benner, P., Onwunta, A., & Stoll, M. (in press)On the Existence and Uniqueness of the Solution of a Parabolic Optimal Control Problem with Uncertain Inputs.

Benner, P., Dolgov, S., Onwunta, A., & Stoll, M. (in press)Solving Optimal Control Problems governed by Random Navier-Stokes Equations using Low-Rank Methods.