Dr. techn. Karl Hollaus

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Address

Institute for Analysis and Scientific Computing
Wiedner Hauptstrasse 8-10
A-1040 Vienna, Austria

phone: +43 1 58801 10116 email: karl.hollaus@tuwien.ac.at

Workshop

Projects

Research Interests

Computational Electromagnetics, Finite Element Method, Multiscale Method and Homogenization, Domain Decomposition, Software Development (Netgen/NGSolve)<br\>

Diploma Thesis

Identifikation optimaler Geometrieparameter einer SMES - Spulenanordnung mit deterministischen und stochastischen Optimierungsverfahren, TU Graz and Dipartimento di Ingegneria Elettrica, Università degli Studi di Genova, 1997.

PhD Thesis

Numerical Simulation of Eddy Currents and the Associated Losses in Laminated Ferromagnetic Materials by the Method of Finite Elements, TU Graz, 2001. pdf

Teaching

"Partielle Differentialgleichungen und Methode der finiten Elemente"

  1. Lecture Notes (2016): pdf
  2. Simulation Examples: zip
  3. NetgenNGSolve (Windows 64bit): exe

Talks

  • Multiscale and Harmonic Balance FEM for the Eddy Current Problem in Laminated Iron Cores, CEFC 2016, Miami, USA, Nov. 13 - 16, 2016. pdf
  • Various Two Dimensional Multiscale Finite Element Formulations for the Eddy Current Problem in Iron Laminates, EMF 2016, Lyon, France, April 12 - 14, 2016. pdf (highlighted talk)
  • Multi-Scale Finite Element Method to Simulate Eddy Currents in Laminated Iron, SCEE 2014, Wuppertal, Germany, July 22 - 25, 2014. pdf
  • Two-Scale Homogenization of the Nonlinear Eddy Current Problem with FEM, Compumag 2013, Budapest, June 30 - July 4, 2013. pdf
  • FEM: Domain Decomposition and Homogenization for Maxwell's Equations of Large Scale Problems, TCSE Vienna Workshop 2012, Vienna, February 13, 2012. pdf
  • Homogenization of the Eddy Current Problem in 2D, 14th International IGTE Symposium 2010, Graz, Austria, Sept. 19 - 22, 2010. pdf
  • Novel Variation Formulation for Domain Decomposition to solve Maxwell's Equations, DSPDES 2010, Barcelona, Spain, June 3, 2010. pdf

Recent Work

  • MSFEM with Network Coupling for the Eddy Current Problem of a Toroidal Transformer, Abstract for ISTET 2017, Ilmenau, Germany, July 16 - 19, 2017 (submitted, April, 2017). preprint
  • Some Two-Dimensional Multiscale Finite Element Formulations for the Eddy Current Problem in Iron Laminates, submitted to IEEE Trans. Magn., March 22, 2017. preprint
  • A Mixed Multiscale Finite Element Method with A and J for Eddy Currents in Iron Laminates, Digest for Compumag 2017, Daejeon, Korea, June 18 - 22, 2017 (submitted, Jan., 2017). preprint
  • Transient Finite Element Simulation of Non-Linear Eddy Current Problems with Biot-Savart-Field of Voltage-Driven Coils, Digest for Compumag 2017, Daejeon, Korea, June 18 - 22, 2017 (submitted, Jan., 2017). preprint
  • Adaptive Mesh Refinement for Multi-Scale FEM for the Eddy Current Problem in Laminated Materials, Digest for Compumag 2017, Daejeon, Korea, June 18 - 22, 2017 (submitted, Jan., 2017). preprint
  • Multiscale and Harmonic Balance FEM for the Eddy Current Problem in Laminated Iron Cores, Short paper for CEFC 2016, Miami, USA, Nov. 13 - 16, 2016 (submitted, April, 2016). preprint
  • An Efficient Reformulation of a Multiscale Method for the Eddy Current Problem, Abstract for IGTE 2016, Graz, Austria, Sept. 18 - 21, 2016. preprint
  • A Mixed Multiscale Finite Element Method for 3D Eddy Currents in Iron Laminates, Abstract for IGTE 2016, Graz, Austria, Sept. 18 - 21, 2016. preprint
  • Various two dimensional multi-scale finite element formulations for the eddy current problem in iron laminates, Abstract for EMF 2016, Lyon, France, from 12 to 14 April 2016. preprint
  • Multi-Scale FEM Modeling of Eddy Currents with a Current Vector Potential T in Laminated Media, Short paper for Compumag 2015, Montreal, Canada, 28 June - 2 July, 2015 (accepted, March, 2015). preprint
  • MSFEM to Simulate Eddy Currents in Laminated Iron, Abstract for Scientific Computing in Electrical Engineering SCEE 2014, Wuppertal, Germany, July 22 - 25, 2014. (submitted, June, 2014). pdf
  • Multi-scale FEM for the eddy current problem in laminated media, Short paper for CEFC 2014, Annecy, France, May 25 - 28, 2014 (submitted, Dec., 2013). preprint

Publications

  1. Markus Schöbinger, J. Schöberl, K. Hollaus, "An Efficient Reformulation of a Multiscale Method for the Eddy Current Problem," COMPEL, vol. 36, 2017. (to be appear) preprint
  2. H. Davtjan, M. Kaltenbacher, J. Schöberl, M. Schöbinger, K. Hollaus, "Multiscale finite element methods for eddy current problems in laminated iron MSFEM4ECP", Technical article, Newsletter, International Compumag Society, Volume 23 No. 2. July, 2016.
  3. K. Hollaus, J. Schöberl, "Multi-scale FEM and magnetic vector potential A for 3D eddy currents in laminated media," COMPEL, vol. 34, no. 5, pp. 1598-1608, 2015. online
  4. K. Hollaus, J. Schöberl, "A Higher Order Multi-Scale FEM with A for 2D Eddy Current Problems in Laminated Iron", IEEE Transactions on Magnetics, (accepted for publication, Sept., 2014). Draft pdf
  5. K. Hollaus, A. Hannukainen, J. Schöberl, "Two-Scale Homogenization of the Nonlinear Eddy Current Problem with FEM," IEEE Transactions on Magnetics, vol. 50, no. 2, pp. 413-416, Feb., 2014. online
  6. K. Hollaus, M. Huber, J. Schöberl, P. Hamberger, "A Linear FEM Benchmark for the Homogenization of the Eddy Currents in Laminated Media in 3D," International Federation of Automatic Control IFAC, vol. 7, no. 1, pp. 1190-1194, 2012. preprint
  7. K. Hollaus, J. Schöberl, "Two-scale FEM for the linear Eddy Current Problem in 3D," Proceedings of the 18th Compumag Conference on the Computation of Electromagnetic Fields, 12-15 July 2011, Sydney, Australia. preprint
  8. K. Hollaus, J. Schöberl, "Homogenization of the Eddy Current Problem in 2D," Proceedings of the 14th International IGTE Symposium on Numerical Field Calculation in Electrical Engineering, pp. 154-159, Graz, Austria, September 19-22, 2010. preprint
  9. K. Hollaus, D. Feldengut, J. Schöberl, M. Wabro, D. Omeragic, "Nitsche-type Mortaring for Maxwell's Equations," Progress In Electromagnetics Research Symposium Proceedings, 397 - 402, July 5-8, Cambridge, USA 2010. preprint
  10. K. Hollaus, O. Bíró, P. Caldera, G. Matzenauer, G. Paoli, K. Preis, C. Stockreiter, "Extraction of Circuit Parameters from PCB by FDTD and SIBC," COMPEL, vol. 28, no. 4, pp. 1091-1101, 2009. online
  11. Björk et al., "System-Level Design," in G.Q. Zhang, A.J. van Roosmalen "More than Moore - Creating High Value Micro/Nanoelectronics Systems," Springer, pp. 305-330, 2009. online
  12. K. Hollaus, O. Bíró, P. Caldera, G. Matzenauer, G. Paoli, and G. Plieschenegger, "Simulation of Crosstalk on Printed Circuit Boards by FDTD, FEM, and a Circuit Model," IEEE Transactions on Magnetics, vol. 44, pp. 1486-1489, April 2008. online
  13. K. Hollaus, O. Bíró, K. Preis and C. Stockreiter, "Edge finite elements coupled with a circuit for wave problems," Internat. Conf. on Electromagnetics in Advanced Applications, ICEAA 2007, IEEE Xplore, pp. 956-959, Torino, Italy, 17th –21st Sept. 2007. online
  14. B. Weiß, O. Bíró, P. Caldera, K. Hollaus, G. Paoli, K. Preis, "A Multigrid Algorithm for the Transfinite-Element Time-Domain Method using the A, V -Formulation", IEEE Transactions on Magnetics, vol. 43, pp. 1353-1356, April 2007. online
  15. C. Stockreiter, G. Matzenauer, O. Biro, P. Caldera, G. Paoli, K. Hollaus, K. Preis, B. Weiss, "Transfinite Element Method Using the A, v-Potential Formulation With Edge Elements in the Frequency Domain," IEEE Transactions on Magnetics, vol. 43, pp. 1349-1352, April 2007. online
  16. W. Renhart, K. Hollaus, C. Magele and G. Matzenauer, "Radiation of USB-WLAN Antenna Influenced by Human Tissue and by Notebook Enclosure," IEEE Transactions on Magnetics, vol. 43, pp. 1345-1348, April 2007. online
  17. B. Weiß, O. Bíró, P. Caldera, K. Hollaus, G. Paoli, K. Preis, C. Stockreiter, "On the convergence of the transfinite-element method," COMPEL, vol. 26, no. 3, pp. 600-611, 2007. online
  18. G. Matzenauer, O. Bíró, K. Hollaus, K. Preis, W. Renhart, "Perfectly Matched Layers for T, Phi Formulation," COMPEL, vol. 26, no. 3, pp. 612-625, 2007. online
  19. H. Scharfetter, K. Hollaus, J. Rosell-Ferrer, R. Merwa, "Single-step 3-D image reconstruction in magnetic induction tomography: Theoretical limits of spatial resolution and contrast to noise ratio," Annals of Biomedical Engineering, pp. 1-13, 2006. online
  20. K. Hollaus, O. Bíró, P. Caldera, G. Matzenauer, G. Paoli, K. Preis, W. Renhart, C. Stockreiter and B. Weiß, "Simulation of Microstrips on Printed Circuit Boards," Tagungsband des 51. Internationalen Wissenschaftliches Kolloquium der TU Ilmenau, ISBN 3-938843-16-0, 5 pages, Ilmenau, Germany, 11-15, September 2006. preprint
  21. K. Hollaus, O. Bíró, K. Preis, C. Stockreiter and B. Weiß, "S-Parameter Extraction from Structures on Printed Circuit Boards by FDTD and Surface Impedance Boundary Condition," Proceedings of The Twelfth IEEE Conference on Electromagnetic Field Computation, ISBN 1-4244-0319-7, p. 378, Miami, USA, April 30th-May 3rd, 2006. online
  22. K. Hollaus, O. Bíró, G. Matzenauer, K. Preis, C. Stockreiter, B. Weiß, P. Caldera and G. Paoli, "Comparison of FETD and FDTD to Simulate Micro-strip Structures on PCBs," Proceedings of The Sixth International Conference on Computation in Electromagnetics CEM 2006, ISBN 3-8007-2957-1, p. 209-210, Aachen, Germany, April 4-6, 2006. preprint
  23. B. Weiß, O. Bíró, K. Hollaus, K. Preis, P. Caldera, G. Paoli, "A Multigrid Solver for Time Harmonic Three-Dimensional Electromagnetic Wave Problems," IEEE Transactions on Magnetics, vol. 42, pp. 639-642, April 2006. online
  24. K. Hollaus, O. Bíró, P. Caldera, G. Matzenauer, G. Paoli, K. Preis, C. Stockreiter, and B. Weiss, "Electromagnetic Field Computation of Simple Structures on Printed Circuit Boards by the Finite-Element Method," IEEE Transactions on Magnetics, vol. 42, pp. 815-818, April 2006. online
  25. B. Wagner, K. Hollaus, Ch. Magele, "Reconstruction of the anisotropic complex conductivity distribution of a human thigh in three dimensions," IEEE Transactions on Magnetics, vol. 42, pp. 1171-1174, April 2006. online
  26. P. Brunner, R. Merwa, A. Missner, J. Rosell, K. Hollaus, H. Scharfetter, "Reconstruction of the shape of conductivity spectra using differential multi-frequency magnetic induction tomography", Physiol. Meas., vol. 27, no. 5, pp. S237-S248, May 2006. online
  27. R. Merwa, P. Brunner, A. Missner, K. Hollaus, H. Scharfetter, "Solution of the inverse problem of magnetic induction tomography (MIT) with multiple objects: analysis of detectability and statistical properties with respect to the reconstructed conducting region", Physiol. Meas., vol. 27, no. 5, pp. S249-S259, May 2006. online
  28. K. Hollaus, B. Wagner, O. Bíró, "Simulation of the quasi-static electric field by an electric current vector potential approximated by edge elements", COMPEL, vol. 24, no. 2, pp. 581-590, 2005. online
  29. B. Wagner, K. Hollaus, Ch. Magele, "Reconstruction of the anisotropic complex conductivity distribution in 3D", COMPEL, vol. 24, no. 2, pp. 558-564, 2005. online
  30. K. Hollaus, O. Bíró, P. Caldera, G. Matzenauer, G. Paoli, K. Preis, B. Weiss, "Simulation of Simple Topologies on a PCB by a Frequency and a Time Domain Method," Proceedings of Joint 9th ICEAA `05 and 11th EESC `05, Torino, Italy, 12th Sept. – 16th Sept. 2005, ISBN 88-8202-094-0, pp. 893-896.preprint
  31. K. Hollaus, O. Bíró, "Comparison of Tetrahedral Edge Finite-Elements Using Different Potential Formulations,” IEEE Transactions on Magnetics, vol. 41, pp. 1676-1679, May 2005. online
  32. K. Hollaus, O. Bíró, C. Gerstenberger, K. Preis, R. Stollberger, B. Wagner, "Effect of Stray Capacitances on Bio-Impedances in Quasi-Static Electric Field,” IEEE Transactions on Magnetics, vol. 41, pp. 1940-1943, May 2005. online
  33. R. Merwa, K. Hollaus, P. Brunner, H. Scharfetter, "Solution of the inverse problem of magnetic induction tomography (MIT)", Physiol. Meas., vol. 26, no. 2, pp. S241-S250, April 2005. online
  34. K. Hollaus, C. Gerstenberger, C. Magele, H. Hutten, "Accurate Reconstruction Algorithm of the Complex Conductivity Distribution in Three Dimensions," IEEE Transactions on Magnetics, vol. 40, pp. 1144-1147, March 2004. online
  35. K. Hollaus, C. Magele, R. Merwa, H. Scharfetter, "Numerical Simulation of the Eddy Current Problem in Magnetic Induction Tomography for Biomedical Applications by Edge Elements,” IEEE Transactions on Magnetics, vol. 40, pp. 623-626, March 2004. online
  36. K. Hollaus, C. Magele, R. Merwa, H. Scharfetter, "Fast calculation of the sensitivity matrix in magnetic induction tomography by tetrahedral edge finite elements and the reciprocity theorem", Physiol. Meas., vol. 25, no. 1, pp. 159-168, February 2004. online
  37. K. Hollaus, B. Weiß, Ch. Magele, H. Hutten, "Geometric multigrid to accelerate the solution of the quasi-static electric field problem by tetrahedral finite elements", Physiol. Meas., vol. 25, no. 1, pp. 169-179, February 2004. online
  38. R. Casañas, H. Scharfetter, A. Altes, A. Remacha, P. Sarda, J. Sierra, R. Merwa, K. Hollaus, J. Rosell, "Measurement of liver iron overload by magnetic induction using a planar gradiometer: preliminary human results", Physiol. Meas., vol. 25, no. 1, pp. 315-323, February 2004. online
  39. H. Scharfetter, S. Rauchenzauner, R. Merwa, O. Bíró, K. Hollaus, "Planar gradiometer for magnetic induction tomography (MIT): theoretical and experimental sensitivity maps for a low-contrast phantom", Physiol. Meas., vol. 25, no. 1, pp. 325-333, February 2004. online
  40. R. Merwa, K. Hollaus, O. Bíró, H. Scharfetter, "Detection of brain oedema using magnetic induction tomography: A feasibility study of the likely sensitivity and detectability", Physiol. Meas., vol. 25, no. 1, pp. 347-354, February 2004. online
  41. R. Casañas, H. Scharfetter, A. Altes, A. Remacha, P. Sarda, J. Sierra, R. Merwa, K. Hollaus, J. Rosell, "In-vitro and in-vivo measurement of iron concentration in human hepatic tissue by magnetic induction methods," Proc. 25th Annual Int. Conf. IEEE, Eng. in Med. and Biol. Society, vol. 4, pp. 3064-3067, Sept. 2003. online
  42. K. Hollaus, R. Stollberger, B. Wagner, C. Gerstenberger, Ch. Magele, H. Hutten, "Simulations of the bio-impedance of the human thigh by the finite element method in 3D", Tagungsband des 48. Internationalen Wissenschaftliches Kolloquium der TU Ilmenau, ISSN 1619-4098, pp. 425-426, Ilmenau, Germany, 22-25, September 2003. preprint
  43. R. Merwa, K. Hollaus, B. Brandstätter, H. Scharfetter, "Numerical solution of the general 3D eddy current problem for magnetic induction tomography (spectroscopy)", Physiol. Meas., vol. 24, no. 2, pp. 545-554, May 2003. online
  44. B. Brandstätter, K. Hollaus, Ch. Magele, M. Michael, R. Merwa, H. Scharfetter, H. Hutten, "Direct estimation of Cole parameters in multifrequency EIT using a regularized Gauss-Newton method", Physiol. Meas., vol. 24, no. 2, pp. 437-448, May 2003. online
  45. K. Hollaus, O. Bíró, B. Brandstätter, S. P. Cermak, H. Zangl, G. Brasseur, "Design and Optimization of a Multi-Induction-Loop Access Control System", Proceedings of the International Symposium on Electromagnetic Compatibility, EMC Europe 2002, vol. 2, pp. 883-888, Sorrent, Italy, September 9-13, 2002. preprint
  46. K. Hollaus, O. Bíró, "Derivation of a Complex Permeability from the Preisach Model," IEEE Transactions on Magnetics, vol. 38, pp. 905-908, March 2002. online
  47. D. Rodger, P. C. Coles, O. Bíró, K. Hollaus, J. Pávó, "An Aluminium Plate Benchmark for ECT", in Electromagnetic Nondestructive Evaluation (V), eds. J. Pávó et al, IOS Press, Amsterdam, vol. 21, pp. 46-48, 2001. online
  48. O. Bíró, K. Hollaus, J. Pávó and K. Preis, "Numerical computation of the magnetic field due to a crack in a conducting plate", in Electromagnetic Nondestructive Evaluation (V), eds. J. Pávó et al, IOS Press, Amsterdam, vol. 21, pp. 11-15, 2001. online
  49. J. Pávó, O. Bíró, K. Hollaus, "Calculation of the field map from the measurement data of the fluxset sensor", COMPEL, vol. 20, no. 2, pp. 404-416, 2001. online
  50. K. Hollaus, O. Bíró, "A FEM of the Eddy Current Losses in Thin Ferromagnetic Sheets", Proceedings of the 9th International IGTE Symposium on Numerical Field Calculation in Electrical Engineering, pp. 152-157, Graz, Austria, September 11-13, 2000. preprint
  51. K. Hollaus, O. Bíró, "A FEM Formulation to Treat 3D Eddy Currents in Laminations," IEEE Transactions on Magnetics, vol. 36, pp. 1289-1292, July 2000. online
  52. D. Rodger, P. C. Coles, O. Bíró, K. Hollaus, J. Pávó, "An Aluminium Plate Benchmark for ECT", in Short Papers of The Sixth International Workshop on Electromagnetic Nondestructive Evaluation, ISBN 9-634206-42-5, Budapest, Hungary, pp. 39-40, 28th-30th July, 2000.
  53. O. Bíró, K. Hollaus, J. Pávó and K. Preis, "Numerical computation of the magnetic field due to a crack in a conducting plate", in Short Papers of The Sixth International Workshop on Electromagnetic Nondestructive Evaluation, ISBN 9-634206-42-5, Budapest, Hungary, pp. 7-8, 28th-30th July, 2000.
  54. K. Hollaus, O. Bíró, "Estimation of 3-D eddy currents in conducting laminations by an anisotropic conductivity and a 1-D analytical solution", COMPEL, vol. 18, no. 3, pp. 494-503, 1999. online