101. |
- Johansson, Håkan, 1979, et al.
(author)
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Computational Constitutive Calibration for Groundwater Flow
- 2003
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In: ADMOS 2003, Adaptive modeling and simulation, September 29-October 1, 2003, Göteborg, Sweden, P.Díez and N.-E.Wiberg (eds). - 8495999307 ; , s. 157-158
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Conference paper (other academic/artistic)
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102. |
- Johansson, Håkan, 1979, et al.
(author)
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Error Computation for Parameter Identification Problems
- 2006
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In: GAMM (Gesellshaft für Angewandte Mathematik und Mechanik) Annual meering, Book of abstracts, March 27-31, 2006, Berlin, Germany. ; , s. 221-
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Conference paper (other academic/artistic)
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103. |
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104. |
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105. |
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106. |
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107. |
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108. |
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109. |
- Johansson, Håkan, 1979, et al.
(author)
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Parameter identification for constitutive models with error control
- 2004
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In: ECCOMAS 2004, European Congress on Computational Methods in Applied Sciences and Engineering. - 9513918688
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Conference paper (other academic/artistic)abstract
- A recently proposed technique for the calibration ofconstitutive models, that is based on optimization with built-in error control, is applied to Norton's viscoelasticity model. In order to focus on the characteristic features, only the constitutive response for uniaxial stress is considered; however, the extension to multiaxial states and spatially non-homogeneous situations is quite straightforward although technically more complex. Essentially, the optimization strategy is based onNewton's method and consists of solving three linear problems running forwards in time and one linear problem (for the costate) running backwards in time. It is interesting to note that the same problem character is pertinent to the solution of the dual problem, which is the basis for the a posteriori error computation.
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110. |
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