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  <doc>
    <id>24263</id>
    <completedYear/>
    <publishedYear>2017</publishedYear>
    <thesisYearAccepted/>
    <language>eng</language>
    <pageFirst>449</pageFirst>
    <pageLast>496</pageLast>
    <pageNumber/>
    <edition/>
    <issue/>
    <volume>316</volume>
    <type>articler</type>
    <publisherName/>
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    <belongsToBibliography>0</belongsToBibliography>
    <completedDate>2019-07-30</completedDate>
    <publishedDate>--</publishedDate>
    <thesisDateAccepted>--</thesisDateAccepted>
    <title language="eng">Dual and approximate dual basis functions for B-splines and NURBS – Comparison and application for an efficient coupling of patches with the isogeometric mortar method</title>
    <abstract language="eng">This contribution defines and compares different methods for the computation of dual basis functions for B-splines and Non-Uniform Rational B-splines (NURBS). They are intended to be used as test functions for the isogeometric mortar method, but other fields of application are possible, too. Three different concepts are presented and compared. The first concept is the explicit formula for the computation of dual basis functions for NURBS proposed in the work of Carl de Boor. These dual basis functions entail minimal support, i.e., the support of the dual basis functions is equal to the support of the corresponding B-spline basis functions. In the second concept dual basis functions are derived from the inversion of the Gram matrix. These dual basis functions have global support along the interface. The third concept is the use of approximate dual basis functions, which were initially proposed for the use in harmonic analysis. The support of these functions is local but larger than the support of the associated B-spline basis functions. We propose an extension of the approximate dual basis functions for NURBS basis functions. After providing the general formulas, we elaborate explicit expressions for several degrees of spline basis functions. All three approaches are applied in the frame of the mortar method for the coupling of non-conforming NURBS patches. A method which allows complex discretizations with multiple intersecting interfaces is presented. Numerical examples show that the explicitly defined dual basis functions with minimal support severely deteriorate the global stress convergence behavior of the mechanical analysis. This fact is in accordance with mathematical findings in literature, which state that the optimal reproduction degree of arbitrary functions is not possible without extending the support of the dual basis functions. The dual basis functions computed from the inverse of the Gram matrix yield accurate numerical results but the global support yields significantly higher computational costs in comparison to computations of conforming meshes. Only the approximate dual basis functions yield accurate and efficient computations, where neither accuracy nor efficiency is significantly deteriorated in comparison to computations of conforming meshes. All basic cases of T-intersections and star-intersections are studied. Furthermore, an example which combines all basic cases in a complex discretization is given. The applicability of the presented method for the nonlinear case and for shell formulations is shown with the help of one numerical example.</abstract>
    <parentTitle language="eng">Computer Methods in Applied Mechanics and Engineering</parentTitle>
    <identifier type="doi">10.1016/j.cma.2016.07.038</identifier>
    <identifier type="issn">0045-7825</identifier>
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    <author>
      <firstName>Wolfgang</firstName>
      <lastName>Dornisch</lastName>
    </author>
    <submitter>
      <firstName>Wolfgang</firstName>
      <lastName>Dornisch</lastName>
    </submitter>
    <author>
      <firstName>Joachim</firstName>
      <lastName>Stöckler</lastName>
    </author>
    <author>
      <firstName>Ralf</firstName>
      <lastName>Müller</lastName>
    </author>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>Isogeometric analysis</value>
    </subject>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>Dual basis functions for NURBS</value>
    </subject>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>Optimal convergence</value>
    </subject>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>Mortar method</value>
    </subject>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>Coupling of non-conforming meshes</value>
    </subject>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>Approximate dual basis functions for NURBS</value>
    </subject>
    <collection role="institutes" number="6309">FG Statik und Dynamik</collection>
  </doc>
  <doc>
    <id>24863</id>
    <completedYear/>
    <publishedYear>2017</publishedYear>
    <thesisYearAccepted/>
    <language>eng</language>
    <pageFirst>467</pageFirst>
    <pageLast>470</pageLast>
    <pageNumber/>
    <edition/>
    <issue/>
    <volume/>
    <type>conferenceobject_ref</type>
    <publisherName>Institute for Structural Mechanics University of Stuttgart</publisherName>
    <publisherPlace>Stuttgart</publisherPlace>
    <creatingCorporation/>
    <contributingCorporation/>
    <belongsToBibliography>0</belongsToBibliography>
    <completedDate>2019-12-13</completedDate>
    <publishedDate>--</publishedDate>
    <thesisDateAccepted>--</thesisDateAccepted>
    <title language="eng">Recent advances in isogeometric dual mortar patch coupling</title>
    <abstract language="eng">Isogeometric analysis fosters the integration of design and analysis by using the geometry description of the CAD system also for the numerical analysis. Hereby, the use of NURBS surfaces is common but entails the need for a coupling of non-conforming patches. The use of mortar methods allows a coupling which requires neither additional variables nor empirical parameters. In this contribution dual basis functions are used in order to obtain an accurate and efficient mortar method.</abstract>
    <parentTitle language="eng">Proceedings of the 7th GACM Colloquium on Computational Mechanics&#13;
for Young Scientists from Academia and Industry, October 11-13, 2017 in Stuttgart, Germany</parentTitle>
    <identifier type="urn">urn:nbn:de:bsz:93-opus-ds-93516</identifier>
    <identifier type="doi">10.18419/opus-9334</identifier>
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    <author>
      <firstName>Wolfgang</firstName>
      <lastName>Dornisch</lastName>
    </author>
    <submitter>
      <firstName>Wolfgang</firstName>
      <lastName>Dornisch</lastName>
    </submitter>
    <author>
      <firstName>Joachim</firstName>
      <lastName>Stöckler</lastName>
    </author>
    <author>
      <firstName>Ralf</firstName>
      <lastName>Müller</lastName>
    </author>
    <collection role="institutes" number="6309">FG Statik und Dynamik</collection>
  </doc>
  <doc>
    <id>28015</id>
    <completedYear/>
    <publishedYear>2021</publishedYear>
    <thesisYearAccepted/>
    <language>eng</language>
    <pageFirst>871</pageFirst>
    <pageLast>931</pageLast>
    <pageNumber/>
    <edition/>
    <issue>4</issue>
    <volume>149</volume>
    <type>articler</type>
    <publisherName/>
    <publisherPlace/>
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    <belongsToBibliography>0</belongsToBibliography>
    <completedDate>2021-11-29</completedDate>
    <publishedDate>--</publishedDate>
    <thesisDateAccepted>--</thesisDateAccepted>
    <title language="eng">An isogeometric mortar method for the coupling of multiple NURBS domains with optimal convergence rates</title>
    <abstract language="eng">We investigate the mortar finite element method for second order elliptic boundary value problems on domains which are decomposed into patchesk with tensor-product NURBS parameterizations. We follow the methodology of IsoGeometric Analysis (IGA) and choose discrete spaces Xh,k on each patch k as tensor-product NURBS spaces of the same or higher degree as given by the parameterization. Our work is an&#13;
extension of Brivadis et al. (Comput Methods Appl Mech Eng 284:292–319, 2015) and highlights several aspects which did not receive full attention before. In particular, by choosing appropriate spaces of polynomial splines as Lagrange multipliers, we obtain&#13;
a uniform infsup-inequality. Moreover, we provide a new additional condition on the discrete spaces Xh,k which is required for obtaining optimal convergence rates of the mortar method. Our numerical examples demonstrate that the optimal rate is lost if this condition is neglected.</abstract>
    <parentTitle language="deu">Numerische Mathematik</parentTitle>
    <identifier type="issn">0945-3245</identifier>
    <identifier type="issn">0029-599X</identifier>
    <identifier type="doi">10.1007/s00211-021-01246-z</identifier>
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    <enrichment key="opus.source">publish</enrichment>
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    <author>
      <firstName>Wolfgang</firstName>
      <lastName>Dornisch</lastName>
    </author>
    <submitter>
      <firstName>Wolfgang</firstName>
      <lastName>Dornisch</lastName>
    </submitter>
    <author>
      <firstName>Joachim</firstName>
      <lastName>Stöckler</lastName>
    </author>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>Isogeometric analysis</value>
    </subject>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>Mortar Method</value>
    </subject>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>Approximate duals</value>
    </subject>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>domain coupling</value>
    </subject>
    <collection role="institutes" number="6309">FG Statik und Dynamik</collection>
  </doc>
  <doc>
    <id>29288</id>
    <completedYear/>
    <publishedYear>2022</publishedYear>
    <thesisYearAccepted/>
    <language>eng</language>
    <pageFirst/>
    <pageLast/>
    <pageNumber/>
    <edition/>
    <issue/>
    <volume/>
    <type>conferenceobject_noref</type>
    <publisherName/>
    <publisherPlace/>
    <creatingCorporation/>
    <contributingCorporation>Institute of Fundamental Technological Research, Polish Academy of Sciences</contributingCorporation>
    <belongsToBibliography>0</belongsToBibliography>
    <completedDate>2022-09-14</completedDate>
    <publishedDate>--</publishedDate>
    <thesisDateAccepted>--</thesisDateAccepted>
    <title language="eng">An isogeometric mortar method with optimal convergence and reduced support</title>
    <abstract language="eng">The main feature of isogeometric analysis is the usage of a coherent geometry description for design and analysis. In most cases, Non-Uniform Rational B-splines (NURBS) are used within the frame of the finite element method, which combines the most common geometrical modeling concept with the most common analysis method in structural mechanics. NURBS are a versatile tool for geometric modeling, and in order to define complex geometric structures, a multitude of tensor-product NURBS patches is required. Typical software in Computer-Aided design can manage smoothness requirements across common interfaces of neighboring patches. For the finite element method, a different type of coupling across interfaces must be achieved. Due to the nature of tensor product NURBS, the simple concept of mutual refinement and subsequent coupling by shared degrees of freedom is prohibitively costly and, in some cases, even not possible. A multitude of coupling methods has been proposed over the last years. The most common concepts are known as mortar methods. In particular, the dual mortar method has been shown to yield very efficient computations. A recent paper by the authors has provided an isogeometric mortar method with mathematically proven optimal convergence of the stress errors over the entire domain. We use dual basis functions, which have support only on one interface and avoid interrelations between different interfaces. Models with a large number of intersecting interfaces can be handled. However, the basis functions have full support on the interfaces. In our current contribution, we propose the use of approximate dual basis functions with the advantage of having local support on the interfaces. These functions fulfill the duality only in an approximate way, but still guarantee the optimal degree for the convergence of the mortar method. Since the duality is not fulfilled, an additional lumping of the mortar matrix is introduced. The error of this lumping can be analyzed mathematically and is not significant in comparison to the global approximation error of the finite element method. The use of the approximate dual basis functions restores the local support of basis functions along the interface while the convergence properties remain intact. Numerical examples show the convergence behavior for simple and complex models.</abstract>
    <parentTitle language="eng">24th International Conference on Computer Methods in Mechanics (CMM) and the 42nd Solid Mechanics Conference (SolMech)</parentTitle>
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    <enrichment key="Artikelnummer">119</enrichment>
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    <enrichment key="Fprofil">4 Künstliche Intelligenz und Sensorik / Artificial Intelligence and Sensor Technology</enrichment>
    <author>
      <firstName>Wolfgang</firstName>
      <lastName>Dornisch</lastName>
    </author>
    <submitter>
      <firstName>Wolfgang</firstName>
      <lastName>Dornisch</lastName>
    </submitter>
    <author>
      <firstName>Joachim</firstName>
      <lastName>Stöckler</lastName>
    </author>
    <collection role="institutes" number="6309">FG Statik und Dynamik</collection>
  </doc>
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