Bletzinger, Kai-Uwe

Ghantasala, Aditya

Kodunthirappully Narayanan, Navaneeth

Meethal, Rishith

Wüchner, Roland

Ghent University Academic Bibliography

Robustness and challenges in 3D FSI simulations withChimera-based flow solvers: Application to flexible structures inenvironmental flows.A. Ghantasala∗, N. K. Narayanan†, R. E. Meethal†, R. Wu¨chner†and K.-U. Bletzinger†∗ † Lehrstuhl fu¨r Statik,Technische Universita¨t Mnchen,Arcisstr. 21, 80333 Mu¨nchen, GermanyE-mail : aditya.ghantasala@tum.de∗ , web page : https://www.st.bgu.tum.deABSTRACTProblems involving fluid simulations have a wide spread applications. Some of these involve ex-treme modifications of fluid domain, for example configuration optimization and coupled prob-lems like fluid-structure interaction simulations involving highly flexible structures. Many ap-proaches like re-meshing, mesh deformation, embedded and chimera techniques have been usedin the past to address the issue of changing fluid domain during these simulations. Although,some of these approaches are suitable for such problems, they have their limitations and targetedapplication range. Among these, Chimera technique offers a promising compromise.(a) Illustration of Backgroundand patch meshes(b) Velocity magnitudeThis contribution discusses the implementation details ofChimera technique for fluid solver using finite element for-mulation and challenges involved in using this fluid solver influid-structure interaction simulations. The implementation ofthis is done in Finite-Element based open-source frameworkKRATOS[2]. In the Chimera technique, the fluid domain is di-vided into a number of overlapping sub-domains called patches.These patches are coupled to a background mesh during the so-lution process to obtain the solution. This coupling of patchesand the background is done monolithically for the solution onentire fluid domain. A coupled simulation involving a chimeraformulated fluid solver, especially when changes in fluid domainare involved, poses different challenges in terms of including thepatches in the background domain. One such application involv-ing fluid domain changes is fluid-structure interaction simulation.Different challenges involved in fluid-structure simulation, theirillustration and the way of tackling them is outlined in detailin this contribution. Figure 1b shows the deformed patch meshfor an fluid-structure simulation and corresponding magnitude ofvelocity distribution which is continuous across the patch andbackground domains.REFERENCES[1] H. Hadzˇic´. Development and Application of a Finite Volume Method for the Computation ofFlows Around Moving Bodies on Unstructured, Overlapping Grids. PhD Thesis, TechnischeUniverstt Hamburg, 2005.[2] P. Dadvand, R. Riccardo and E. On˜ate. An object-oriented environment for developingfinite element codes for multi-disciplinary applications. Archives of computational methodsin engineering (2010) 17(3):253297.

Robustness and Challenges in 3D FSI Simulations with Chimera-Based Flow Solvers: Application to Flexible Structures in Environmental Flows

https://biblio.ugent.be/publication/8639263/file/8639267.pdf

Robustness and Challenges in 3D FSI Simulations with Chimera-Based Flow Solvers: Application to Flexible Structures in Environmental Flows

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Ghent University Academic Bibliography