Naslov
An Approach for the Spatial Coupling of Multibody System Chain in a Partitioned Algorithm

Autori
Matijašević, Dubravko ; Terze, Zdravko

Vrsta, podvrsta i kategorija rada
Radovi u zbornicima skupova, cjeloviti rad (in extenso), znanstveni

Izvornik
Proceedings of the ECCOMAS - Multibody Dynamics 2013 Conference / Terze, Zdravko ; Vrdoljak, Milan - Zagreb, 2013, 883-892

ISBN
978-953-7738-22-8

Skup
ECCOMAS - Multibody Dynamics 2013

Mjesto i datum
Zagreb, Hrvatska, 01.07.2013. - 04.07.2013

Vrsta sudjelovanja
Predavanje

Vrsta recenzije
Međunarodna recenzija

Ključne riječi
Multibody System; Fluid Structure Interaction; Conservative Spatial Coupling; Weakly Coupled Partitioned Approach; Radial Basis Function Interpolation.

Sažetak
In this paper, we analyze an approach for constructing an aeroelastic interface, when a multibody system (MBS) is used to represent a structural partition and a boundary-fitted deforming mesh represents the flow domain. Conservation and consistency of the interface is considered at a global level (the MBS as a whole), as well as for every body in the MBS. Due to the flexibility with respect to the problem dimensionality and distribution of data centers, a radial basis function interpolation is considered in this analysis for the spatial interface formulation. If different rigid bodies of the MBS are separated with a good clearance, there is a fluid domain mesh between them, meaning that the interface around each body can be mapped rigidly. That approach is both consistent and conservative. However, the problem occurs when bodies are closely situated, allowing for avoidance of the discretization of the flow domain between them. The origin of the problem is a geometry simplification which, if not taken into the account, implies the assumption that if the velocity field is not significantly influenced by the gap between rigid bodies, then the pressure field in the gap is not significant for the coupled fluid-structure interaction dynamics. However, in this paper we will adopt the assumption that pressure can propagate to surfaces in the gaps even if the flow field is not discretised there and we refer to this assumption as the approximation consistency. An example of an open-chain MBS with closely situated consecutive bodies, between which the discretisation of the fluid flow can be avoided, is a wing-aileron system. As it is the case with the most hinging systems of the aircraft control surfaces, this system has a such configuration that restricting the deformable region to the aileron gives a reasonably good approximation of the real geometry. We will show that such an approach results in the formulation that implies the conservative virtual work transfer in the context of each body, if the approximation consistency condition is met. Furthermore, under the same assumption, correct net loads on each body will be transferred from a constant pressure field.

Izvorni jezik
Engleski

Znanstvena područja
Zrakoplovstvo, raketna i svemirska tehnika

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