Ottmar's Homepage



Ottmar Klaas                                   email: oklaas@scorec.rpi.edu.  
Research Associate
Scientific Computation Research Center
Rensselaer Polytechnic Institute
110 8th St.
Troy, NY 12180-3590
Phone: (518) 276-2224
Fax: (518) 276-4886


Publications


Reviewed papers in international journals:

Klaas, O., Wedemeier, Th.:
Parallelrechner: Neue Spezialcomputer fuer Ingenieure und Naturwissenschaftler. (in German)
Bauingenieur mit Bauinformatik, Heft 2 (1992).

Klaas, O., Kreienmeyer, M., Stein, E.:
Elasto-plastic finite element analysis on a MIMD parallel-computer.
Eng. Comp. 11, Nr. 4, (1994) 347 --355.

Klaas, O., Schröder, J., Stein, E., Miehe, C.:
A Regularized Dual Mixed Element for Plane Elasticity. Implementation and Performance of the BDM--Element.
Comp. Meth. Appl. Mech. Engrg. 121 (1995), 201-209.

Klaas, O., Niekamp, R., Stein, E.:
Parallel Adaptive Finite Element Computations with Hierarchical Preconditioning.
Comp. Mech. Vol. 16, Nr. 1, (1995) 45-52.

Braess, D., Klaas, O., Niekamp, R., Stein, E., Wobschal, F.:
Error Indicators for mixed finite elements in 2-dimensional linear elasticity.
Comp. Meth. Appl. Mech. Engrg., 127 (1995), 345-356.

Brink, U., Klaas, O., Niekamp, R., Stein, E.:
Coupling of adaptively refined dual mixed finite elements and boundary elements in linear elasticity.
Advances in Engineering Software 24 (1995), 13-26.

Schröder, J., Klaas, O., Miehe, C., Stein, E.:
A physically Nonlinear Dual Mixed Finite Element Formulation.
Comp. Meth. Appl. Mech. Engrg., 144 (1997), 77-92.

Klaas, O., Niekamp, R., Stein, E.:
Algorithms for the calculation of limit and bifurcation points using Lanczos methods.
Comp. Mech. Vol 20, Nr. 3, (1997) 221-228

Bottasso, C.L., Klaas, O., Shephard, M.S.:
Data structures and mesh modification tools for unstructured multigrid adaptive techniques.
Engineering with Computers, 14 (1998), 235-247

Klaas, O., Maniatty, A., Shephard, M.S.:
A stabilized mixed finite element method for finite elasticity. Formulation for linear displacement and pressure interpolation.
Comput. Methods Appl. Mech. Engrg. 180 (1999) 65 - 79 (pdf file)

Klaas, O., Shephard, M.S.:
Automatic Generation of Octree based Three Dimensional Discretizations for Partition of Unity Methods.
Computational Mechanics 25 (2000) 2/3, 296 - 304 (pdf file)

Klaas, O.; Shephard, M.S.:
Embedding Reliable Numerical Analysis Capabilities into an Enterprise Wide Information System.
Engineering with Computers 17 (2000) 2, 151 - 161. (pdf file)

Maniatty, A.M., Liu, Y., Klaas, O., Shephard, M.S.:
Stabilized Finite Element Method for Viscoplastic Flow: Formulation and Simple Progressive Solution Strategy. Comput. Methods Appl. Mech. Engrg. 190 (2001) 4609 - 4625.

Maniatty, A.M., Liu, Y., Klaas, O., Shephard, M.S.:
Higher Order Stabilized Finite Element Method for Hyper-Elastic Finite Deformation. Comput. Methods Appl. Mech. Engrg. 191 (2002) 1491 - 1503.

Remacle, J.F., Klaas, O., Flaherty, J.E., Shephard, M.S.:
Parallel Algorithm Oriented Mesh Database. Submitted for publication to: Engineering with Computers. (pdf file)


Papers in proceedings etc.:

Klaas, O.:
Parallelrechner: Neue Spezialcomputer fuer Ingenieure und Naturwissenschaftler.
Fortschrittsberichte VDI. Hrsg.: W. Huhnt, A. Laabs, F. Molkenthing, Reihe 4: Bauingenieurwesen, Nr. 107 (1991)

Klaas, O., Kreienmeyer, M.:
Parallelisierung numerischer Algorithmen.
Fortschrittsberichte VDI. Hrsg: A. Fischer, U. Kolender, H.J. Schneider, Reihe 4: Bauingenieurwesen, Nr. 116 (1992).

Klaas, O., Kreienmeyer, M., Stein, E.:
Numerische Lösung ebener Probleme der linearen Elastizitätstheorie mit der direkten Randelementmethode auf einem MIMD--Parallelrechner.
Baumann, Grube (Hrsg.): Proceedings der TAT, Springer Verlag, Aachen, 1992

Stein, E., Klaas, O., Niekamp, R.:
A Nonlinear Finite Element Program with Adaptive Mesh Refinement for a MIMD Parallel Computer.
Proc. Sec. Int. Conference on Computational Structures Technology, Athens, Greece, 30.8. -- 1.9.1994.

Klaas, O., Niekamp, R., Stein, E.:
Parallel Eigenvalue Computations on Hierarchical Refined Finite Element Meshes.
Proceedings of the IV. International Conference on Computing in Civil and Building Engineering, Berlin, 12.7.-15.7.95, 1995.

Beckedahl, H., Huertgen, H., Straube, E., Horz, W., Wolf, W., Klaas, O., Lengnick, M.:
Begleitende Forschung zur Einfuehrung des Falling Weight Deflectometer (FWD) in der Bundesrepublik Deutschland.
Forschung Strassenbau und Strassenverkehrstechnik, Heft 733, 1996. Herausgegeben vom Bundesministerium fuer Verkehr.

Klaas, O., Niekamp, R., Stein, E.:
Algorithms for the Calculation of Limit and Bifurcation Points of Stability Problems in Structural Mechanics using Krylov based Methods on a MIMD Parallel Computer.
ECCOMAS'96 Proceedings. Paris, September 9-13, (1996).

Klaas, O.:
Adaptive Finite-Elemente-Methoden fuer MIMD-Parallelrechner zur Behandlung von Strukturproblemen mit Anwendung auf Stabilitaetsprobleme.
Forschungs- und Seminarberichte aus dem Bereich der Mechanik der Universitaet Hannover, Bericht-Nr. F96/7.

Klaas, O., Shephard, M.S.:
Automatic Generation of Partition of Unity Discretizations for Three Dimensional Domains.
International Conference on Computational Engineering Science. Atlanta, GA, October 6-9, 1998.

Klaas, O., Maniatty, A., Shephard, M.S.:
Three-Dimensional Stabilized Finite Element Model for Finite Deformation Processes.
In: Constitutive and Damage Modeling of Inelastic Deformation and Phase Transformation. Proceedings of Plasticity'99: The Seventh International Symposium on Plasticity and its current Applications. Cancun, Mexico January 5-13, 1999.

Klaas, O., Shephard, M.S.:
Automatic Generation of Partition of Unity Discretizations for Three Dimensional Domains.
In: Theoretische und numerische Methoden in der angewandten Mechanik mit Praxisbeispielen.
Forschungs- und Seminarberichte aus dem Bereich der Mechanik der Universitaet Hannover. R. Mahnken (Hrsg.). Bericht Nr. F 98/4.

Maniatty, A.M., Liu, Y., Klaas, O.:
Heterogeneous Stresses in Thin Polycrystalline Films on Substrates. In: Proceedings of Plasticity 2000: Plastic and Viscoplastic Response of Materials and Metal Forming. A. Khan, H. Zhang, Y. Yuan (eds.) Neat Press, pp. 635 - 637. The 8th international Symposium on Plasticity. Whistler Resort, British Columbia, Canada. July 17 to 21, 2000.

Maniatty, A.M., Liu, Y., Klaas, O., Shephard, M.S.:
Higher order Stabilized FEM for Modeling Finite Deformations. In: Proceedings of Plasticity 2000: Plastic and Viscoplastic Response of Materials and Metal Forming. A. Khan, H. Zhang, Y. Yuan (eds.) Neat Press, pp. 83 - 85. The 8th international Symposium on Plasticity. Whistler Resort, British Columbia, Canada. July 17 to 21, 2000.

Liu, Y., Maniatty, A.M., Klaas, O., Shephard, M.S.:
A Stabilized Mixed FEM for Viscoplastic Flow Analysis.
In: Proceedings of IMECE 2000. ASME Press, pp. 761 - 767. 2000 International Mechanical Engineering Congress and Exposition. November 5-10, 2000, Orlando, Florida, USA.

Remacle, J-F., Klaas, O., Flaherty, J.E., Shephard, M.S.:
Parallel Algorithm Oriented Mesh Database. In: Proceedings of the 10th International Meshing Roundtable. October 7-10, 2001, Newport Beach, California. (pdf file)


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