HAL will be down for maintenance from Friday, June 10 at 4pm through Monday, June 13 at 9am. More information

# Aeroelastic Coupling Between a Low Mach Inviscid Flow and a Flexible Generic Airship

3 SMASH - Simulation, modeling and analysis of heterogeneous systems
CRISAM - Inria Sophia Antipolis - Méditerranée , Université de Provence - Aix-Marseille 1
Abstract : In the context of an airship development programme, inviscid flow behavior and its coupling with structure flexibility are investigated. For this purpose, we have chosen a nonlinear analysis tool relying on the unsteady Euler model for the flow part and the classical elastodynamic equations for the structure. The numerical model for the flow is based on a Mixed Element Volume discretization derived in an Arbitrary-Lagrangian-Eulerian framework in order to cope with the structural deformations. The case of low-Mach flows (natural flight regime for an airship) can be handled by a special dissipation preconditioner which improves the accuracy of the flow simulation. The structural model, coupled to the flow solver, is discretized by the finite element method in a Lagrangian formulation. In this work we have performed a series of inviscid flow calculations with the goal to evaluate accurately the global aerodynamical coefficients. We first compare the influence of different stiffeners in the airship structural model for flows with zero and non-zero ($20^\circ$) angle of attack. Then, we study the influence of the numerical dissipation and of the low-Mach preconditioning. We observe -as expected- the stabilizing effect of the stiffeners, specially longitudinal ones. The positive impact of low Mach preconditioning and numerical dissipation on the results is also evaluated.
Keywords :
Document type :
Reports
Domain :

Cited literature [1 references]

https://hal.inria.fr/inria-00070550
Contributor : Rapport de Recherche Inria Connect in order to contact the contributor
Submitted on : Friday, May 19, 2006 - 8:49:59 PM
Last modification on : Wednesday, March 16, 2022 - 3:00:57 AM
Long-term archiving on: : Sunday, April 4, 2010 - 9:27:06 PM

### Identifiers

• HAL Id : inria-00070550, version 1

### Citation

Kamal El Omari, Éric Schall, Bruno Koobus, Alain Dervieux. Aeroelastic Coupling Between a Low Mach Inviscid Flow and a Flexible Generic Airship. [Research Report] RR-5456, INRIA. 2006, pp.22. ⟨inria-00070550⟩

Record views