An approach for the spatial coupling of multibody system chain in a partitioned algorithm

Matijašević, Dubravko and Terze, Zdravko (2013) An approach for the spatial coupling of multibody system chain in a partitioned algorithm. = An approach for the spatial coupling of multibody system chain in a partitioned algorithm. In: ECCOMAS Thematic Conference on Multibody Dynamics 2013, 01-04.07.2013., Zagreb; Croatia.

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Abstract

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 discretisation 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.

Item Type: Conference or Workshop Item (Lecture)
Keywords (Croatian): Consistency conditions; Constant pressures; Multi Body Systems; Partitioned algorithm; Problem dimensionality; Radial basis function interpolation; Spatial couplings; Weakly coupled partitioned approach, Aeroelasticity; Ailerons; Chains; Deformation; Fluid dynamics; Fluid structure interaction; Interpolation; Radial basis function networks; Rigid structures; Velocity; Dynamics
Subjects: TECHNICAL SCIENCE > Aviation, rocket and space technology
Divisions: 1300 Department of Aeronautical Engineering > 1320 Chair of Aircraft Dynamics
Indexed in Web of Science: No
Indexed in Current Contents: No
Citations SCOPUS: 0 (12.5.2015.)
Date Deposited: 12 May 2015 12:38
Last Modified: 12 May 2015 12:38
URI: http://repozitorij.fsb.hr/id/eprint/4014

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