Open source ELMER software based FEM modeling of waveguides and resonant cavities for microwave heating and drying devices

Szałatkiewicz, Jakub; Szewczyk, Roman; Kalinowski, Mateusz; Kataja, Juhani; Råback, Peter; Ruokolainen, Juha; Kachniarz, Maciej

doi:10.1515/aee-2017-0056

Cited by 4 publications

(2 citation statements)

References 8 publications

(6 reference statements)

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“…In order to resolve the wave structure sufficiently precise, the space discretization ("mesh") needs 5 to 10 mesh points per photon wavelength. In this paper we consider the commercially available COMSOL Multiphysics R [45] (wave-optics module) and the open-source package Elmer [46,47] (VectorHelmholtz module). Using two different FEM tools enables us to cross-check the results obtained with both tools and to possibly disentangle systematics from the different algorithms or meshes from physical effects.…”

Section: Specialized Finite Element Methods (Fem)mentioning

confidence: 99%

A first look on 3D effects in open axion haloscopes

Knirck¹,

Schütte-Engel²,

Millar³

et al. 2019

J. Cosmol. Astropart. Phys.

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We explore finite size 3D effects in open axion haloscopes such as a dish antenna, a dielectric disk and a minimal dielectric haloscope consisting of a mirror and one dielectric disk. Particularly dielectric haloscopes are a promising new method for detecting dark matter axions in the mass range above 40 µeV. By using two specialized independent approaches -based on finite element methods and Fourier optics -we compute the electromagnetic fields in these settings expected in the presence of an axion dark matter field. This allows us to study diffraction and near field effects for realistically sized experimental setups in contrast to earlier idealized 1D studies with infinitely extended mirrors and disks. We also study axion velocity effects and disk tiling. Diffraction effects are found to become less relevant towards larger axion masses and for the larger disk radii for example aimed at in full size dielectric haloscopes such as MAD-MAX. The insights of our study not only provide a foundation for a realistic modelling of open axion dark matter search experiments in general, they are in particular also the first results taking into account 3D effects for dielectric haloscopes.

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Section: Specialized Finite Element Methods (Fem)mentioning

confidence: 99%

A first look on 3D effects in open axion haloscopes

Knirck¹,

Schütte-Engel²,

Millar³

et al. 2019

J. Cosmol. Astropart. Phys.

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“…The alternative is open-source software, which also has the benefit of freely available code for calculation verification purposes. Implementation of the proposed model was carried out exclusively with the use of an open-source microwave modelling tool chain, operated under LINUX MINT [37], covering OCTAVE (free equivalent of MATLAB) [38], NETGEN mesh generator [39][40][41], ELMER FEM microwave FEM solver [42] and PARA-VIEW [43,44] software for visualization of results.…”

Section: Implementation Of Proposed Models In Open-source Fem-oriented Softwarementioning

confidence: 99%

The Influence of Mesh Granularity on the Accuracy of FEM Modelling of the Resonant State in a Microwave Chamber

et al. 2021

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Microwave technology is widely used in different areas of advanced industry when energy must be provided to water-containing and other materials. The main barrier in the development of microwave devices is the possibility of efficient design by modelling a microwave system in a resonant state. For technical systems, the finite element method is widely used. However, the convergence process in the microwave finite element solver is sophisticated. The process itself and the influence of mesh granularity on the accuracy of modelling of microwave chambers in resonant states have not been investigated previously. The present paper aims to fill this gap. The resonance conditions of a microwave chamber were tested from the point of view of spatial resolution of the tetrahedral mesh used for open-source ELMER FEM software. The presented results experimentally determine the limits of accuracy of the geometry of microwave resonant chamber finite element method-based models. The determined values of microwave resonant chamber dimension tolerances should be considered for both open-source and commercial software for microwave modelling.

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