Unsteady FSI Analysis of a Square Array of Tubes in Water Crossflow

Costa, Emiliano; Groth, Corrado; Lavedrine, Jacques; Caridi, Domenico; Dupain, Gaëtan; Biancolini, Marco Evangelos

doi:10.1007/978-3-030-36514-1_8

Cited by 8 publications

(5 citation statements)

References 18 publications

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“…which is required for the matrix of metric coefficients, A αβ = A T α A β , to calculate the gradient vectors A α . This allows the calculation of the deformation gradient (1) and, accordingly, the principal stretches (10).…”

Section: Application Of Radial Basis Functions For Strain Determinationmentioning

confidence: 99%

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Full-Field Strain Determination for Additively Manufactured Parts Using Radial Basis Functions

2021

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Additively manufactured components, especially those produced in deposition welding processes, have a rough curvilinear surface. Strain and surface deformation analysis of such components is increasingly performed using digital image correlation (DIC) methods, which raises questions regarding interpretability of the results. Furthermore, in triangulation or local tangential plane based DIC strain analysis, the principal strain directions are difficult to be calculated at any point, which is due to the non-continuity of the approach. Thus, both questions will be addressed in this article. Apart from classical local strain analysis based on triangulation or local linearization concepts, the application of globally formulated radial basis functions (RBF) is investigated for the first time, with the advantage that it is possible to evaluate all interesting quantities at arbitrary points. This is performed for both interpolation and regression. Both approaches are studied at three-dimensional, curvilinear verification examples and real additively manufactured cylindrical specimens. It is found out that, if real applications are investigated, the RBF-approach based on interpolation and regression has to be considered carefully due to so-called boundary effects. This can be circumvented by only considering the region that has a certain distance to the edges of the evaluation domain. Independent of the evaluation scheme, the error of the maximum principal strains increases with increasing surface roughness, which has to be kept in mind for such applications when interpreting or evaluating the results of manufactured parts. However, the entire scheme offers interesting properties for the treatment of DIC-data.

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Section: Application Of Radial Basis Functions For Strain Determinationmentioning

confidence: 99%

“…Refs. [9,10] apply RBFs within the field of fluid-structure interactions using mesh morphing techniques. For unstructured meshes, Ref.…”

Section: Introductionmentioning

confidence: 99%

Full-Field Strain Determination for Additively Manufactured Parts Using Radial Basis Functions

2021

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“…Transient modal superposition can also be successfully applied when more than one structure has to be studied in an FSI analysis. In [60], a 3X4 tubes array in an inline crossflow heat exchanger was analyzed in ANSYS Workbench using Fluent and Mechanical, and results compared with the ones found in [48]. In this case, since the tubes were identical, only one eigenvalue analysis was performed to extract modal shapes and natural frequencies for all the tubes.…”

Section: Transient Fsi Examplesmentioning

confidence: 99%

Radial Basis Functions Vector Fields Interpolation for Complex Fluid Structure Interaction Problems

Groth

Porziani

Biancolini

2021

Fluids

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Fluid structure interaction (FSI) is a complex phenomenon that in several applications cannot be neglected. Given its complexity and multi-disciplinarity the solution of FSI problems is difficult and time consuming, requiring not only the solution of the structural and fluid domains, but also the use of expensive numerical methods to couple the two physics and to properly update the numerical grid. Advanced mesh morphing can be used to embed into the fluid grid the vector fields resulting from structural calculations. The main advantage is that such embedding and the related computational costs occur only at initialization of the computation. A proper combination of embedded vector fields can be used to tackle steady and transient FSI problems by structural modes superposition, for the case of linear structures, or to impose a full non-linear displacement time history. Radial basis functions interpolation, a powerful and precise meshless tool, is used in this work to combine the vector fields and propagate their effect to the full fluid domain of interest. A review of industrial high fidelity FSI problems tackled by means of the proposed method and RBF is given for steady, transient, and non-linear transient FSI problems.

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“…Transient modal superposition allows also to deal with cases in which multiple different flexible objects are interacting each other’s, as in the case shown by Costa et al (2017), in which the aim was to study the vortex shedding in an in-line cross-flow heat exchanger composed by a 3X4 array of tubes and to compare results to the literature values found in (Ali Abd-rabbo, 1984). A single eigenvalue problem was solved to obtain modal shapes and frequencies, being the same for all tubes.…”

Section: Industrial Applications Of Fluid Structure Interaction Modal Approachmentioning

confidence: 99%

Fast high fidelity CFD/CSM fluid structure interaction using RBF mesh morphing and modal superposition method

Groth¹,

Cella

Costa

et al. 2019

AEAT

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Purpose This paper aims to present a fast and effective approach to tackle complex fluid structure interaction problems that are relevant for the aeronautical design. Design/methodology/approach High fidelity computer-aided engineering models (computational fluid dynamics [CFD] and computational structural mechanics) are coupled by embedding modal shapes into the CFD solver using RBF mesh morphing. Findings The theoretical framework is first explained and its use is then demonstrated with a review of applications including both steady and unsteady cases. Different flow and structural solvers are considered to showcase the portability of the concept. Practical implications The method is flexible and can be used for the simulation of complex scenarios, including components vibrations induced by external devices, as in the case of flapping wings. Originality/value The computation mesh of the CFD model becomes parametric with respect to the modal shape and, so, capable to self-adapt to the loads exerted by the surrounding fluid both for steady and transient numerical studies.

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Unsteady FSI Analysis of a Square Array of Tubes in Water Crossflow

Cited by 8 publications

References 18 publications

Full-Field Strain Determination for Additively Manufactured Parts Using Radial Basis Functions

Full-Field Strain Determination for Additively Manufactured Parts Using Radial Basis Functions

Radial Basis Functions Vector Fields Interpolation for Complex Fluid Structure Interaction Problems

Fast high fidelity CFD/CSM fluid structure interaction using RBF mesh morphing and modal superposition method

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