Research interests

My research interests lie on computational solid and structrural mechanics and in their engineering and scientific applications. Current research project:

"How to Handle the Prima Donna of Structures: Analysis and Development of Advanced Discretization Techniques for the Simulation of Thin Shells"

Recent talks

  • A family of triangular shell elements, XII Finnish Mechanics Days, Tampere, Finland, June 2015. [ pdf ]

  • Scordelis-Lo Roof Revisited, NSCM-27, Stockholm, Sweden, October 2014. [ pdf ]

  • Discontinuous Petrov-Galerkin finite element method for numerical analysis of partial differential equations, FinEst Math, Helsinki, Finland, January 2014. [ pdf ]

Publications

Peer-reviewed journals and conference proceedings

[1] Antti H. Niemi, Nathaniel O. Collier, and Victor M. Calo. Discontinuous Petrov-Galerkin method based on the optimal test space norm for one-dimensional transport problems. Submitted to Journal of Computational Science.
[2] Antti H. Niemi, Ivo Babuška, Juhani Pitkäranta, and Leszek Demkowicz. Finite element analysis of the Girkmann problem using the modern hp-version and the classical h-version. Engineering with Computers, In press, 2011.
[3] Leszek Demkowicz, Jay Gopalakrishnan, and Antti H. Niemi. A class of discontinuous Petrov-Galerkin methods. Part III: Adaptivity. To appear in Applied Numerical Mathematics.
[4] Antti H. Niemi, Jamie A. Bramwell, and Leszek F. Demkowicz. Discontinuous Petrov-Galerkin methods for thin-body problems in solid mechanics. Computer Methods in Applied Mechanics and Engineering, 200:1291-1300, 2011. [ DOI ]
[5] Antti H. Niemi. A bilinear shell element based on a refined shallow shell model. International Journal for Numerical Methods in Engineering, 81:485-512, 2010. [ DOI ]
[6] Antti H. Niemi. Recent developments in the analysis and design of bilinear shell elements. Rakenteiden mekaniikka, 42:171-186, 2009. [ .pdf ]
[7] Antti H. Niemi. Approximation of shell layers using bilinear elements on anisotropically refined rectangular meshes. Computer Methods in Applied Mechanics and Engineering, 197:3964-3975, 2008. [ DOI ]
[8] Antti H. Niemi and Juhani Pitkäranta. Bilinear finite element for shells: isoparametric quadrilaterals. International Journal for Numerical Methods in Engineering, 75:212-240, 2008. [ DOI ]
[9] Antti H. Niemi, Juhani Pitkäranta, and Harri Hakula. Benchmark computations on point-loaded shallow shells: Fourier vs. FEM. Computer Methods in Applied Mechanics and Engineering, 196:894-907, 2007. [ DOI ]

Technical reports

[1] Antti H. Niemi, Ivo Babuška, Juhani Pitkäranta, and Leszek Demkowicz. Finite element analysis of the Girkmann problem using the modern hp-version and the classical h-version. ICES REPORT 10-47, The Institute for Computational Engineering and Sciences, The University of Texas at Austin, 2010. Submitted to Engineering with Computers. [ .pdf ]
[2] Leszek Demkowicz, Jay Gopalakrishnan, and Antti H. Niemi. A Class of Discontinuous Petrov-Galerkin Methods. Part III: Adaptivity. ICES REPORT 10-01, The Institute for Computational Engineering and Sciences, The University of Texas at Austin, 2010. [ .pdf ]
[3] Antti H. Niemi, Jamie A. Bramwell, and Leszek F. Demkowicz. Discontinuous Petrov-Galerkin methods for thin-body problems in solid mechanics. ICES REPORT 10-13, The Institute for Computational Engineering and Sciences, The University of Texas at Austin, 2010. [ .pdf ]
[4] Antti H. Niemi. Best bilinear shell element: flat, twisted or curved? Institute of Mathematics Research Reports A564, Helsinki University of Technology, 2009. [ .pdf ]
[5] Antti H. Niemi. A bilinear shell element based on a refined shallow shell model. Institute of Mathematics Research Reports A562, Helsinki University of Technology, 2008. [ .pdf ]
[6] Timo Eirola, Juho Könnö, Toni Lassila, Antti H. Niemi, and Rolf Stenberg. Perspectives in numerical analysis, TKK, May 27-29, 2008. Institute of Mathematics Reports C19, Helsinki University of Technology, 2008. [ .pdf ]