Zobrazeno 1 - 10
of 81
pro vyhledávání: '"Dölz, Jürgen"'
We discuss the advantages of a spline-based freeform shape optimization approach using the example of a multi-tapered coaxial balun connected to a spiral antenna. The underlying simulation model is given in terms of a recently proposed isogeometric i
Externí odkaz:
http://arxiv.org/abs/2406.19025
We consider Maxwell eigenvalue problems on uncertain shapes with perfectly conducting TESLA cavities being the driving example. Due to the shape uncertainty the resulting eigenvalues and eigenmodes are also uncertain and it is well known that the eig
Externí odkaz:
http://arxiv.org/abs/2401.11890
Autor:
Nolte, Maximilian, Torchio, Riccardo, Schöps, Sebastian, Dölz, Jürgen, Wolf, Felix, Ruehli, Albert E.
This contribution investigates the connection between isogeometric analysis and integral equation methods for full-wave electromagnetic problems up to the low-frequency limit. The proposed spline-based integral equation method allows for an exact rep
Externí odkaz:
http://arxiv.org/abs/2401.10735
We study time harmonic acoustic scattering on large deviation rough random scatterers. Therein, the roughness of the scatterers is caused by a low Sobolev regularity in the covariance function of their deformation field. The motivation for this study
Externí odkaz:
http://arxiv.org/abs/2311.12565
We solve acoustic scattering problems by means of the isogeometric boundary integral equation method. In order to avoid spurious modes, we apply the combined field integral equations for either sound-hard scatterers or sound-soft scatterers. These in
Externí odkaz:
http://arxiv.org/abs/2306.11324
Autor:
Dölz, Jürgen, Henríquez, Fernando
We consider a family of boundary integral operators supported on a collection of parametrically defined bounded Lipschitz boundaries. Consequently, the boundary integral operators themselves also depend on the parametric variables, thus leading to a
Externí odkaz:
http://arxiv.org/abs/2305.19853
Autor:
Dölz, Jürgen
We consider the $\mathcal{H}^2$-formatted compression and computational estimation of covariance functions on a compact set in $\mathbb{R}^d$. The classical sample covariance or Monte Carlo estimator is prohibitively expensive for many practically re
Externí odkaz:
http://arxiv.org/abs/2301.11992
Autor:
Dölz, Jürgen, Ebert, David
We consider generalized operator eigenvalue problems in variational form with random perturbations in the bilinear forms. This setting is motivated by variational forms of partial differential equations with random input data. The considered eigenpai
Externí odkaz:
http://arxiv.org/abs/2210.09089
The numerical solution of dynamical systems with memory requires the efficient evaluation of Volterra integral operators in an evolutionary manner. After appropriate discretisation, the basic problem can be represented as a matrix-vector product with
Externí odkaz:
http://arxiv.org/abs/2103.12834
This paper considers the iterative solution of linear systems arising from discretization of the anisotropic radiative transfer equation with discontinuous elements on the sphere. In order to achieve robust convergence behavior in the discretization
Externí odkaz:
http://arxiv.org/abs/2102.09038