adaptive structures for fluid flow regulation
Post on 09-Dec-2021
9 Views
Preview:
TRANSCRIPT
www.bristol.ac.uk/composites
A design concept for an adaptive, variable geometry fluid inlet is presented. Theinlet’s shape adapts passively in response to varying flow conditions. In contrast totraditional designs, the inlet does not rely on separate mechanisms for actuation.Instead, the novelty of the present approach is that a variety of adaptive responsesare obtained by exploiting the nonlinear behaviour of post-buckled structures.
Adaptive structures for fluid flow regulation
Gaetano Arena, Rainer Groh, Raf Theunissen, Paul Weaver & Alberto Pirrera
Supported by
Coupled Eulerian-Lagrangian (CEL) fluid-structure interaction
Adaptive inlet with monostable snap-through behaviour
1) Open stable state 2) Snap-through occurs once a critical velocity is reached
3) Unstable closed state 4) Suction holds the inlet in itsclosed state.
INTERACTION
FLUID
Abaqus solves the Equation of State (EOS), plus the continuity and momentum equations.
p=pressure; pH=Hugoniot pressure; Γ=Grüneisen ratio; EH=Hugoniot specific energy; e=internal energy;ρ=density; v=velocity; f=body forces, σ=Cauchy stress tensor=-pI+σdev.
Precompression
Adaptive behaviour through nonlinear structural mechanics
Influence of pre-compression and pre-bending (1) on a post-buckled beam (2). When symmetry is broken (broken pitchfork), regions of bistability (3), monostability with snap-through behaviour (4) and simple monostability are identified.
Centr
al dis
pla
cem
ent
(1)
(2) (3)
(4)Bistability
STRUCTURE
Monostability with snap-through behaviour
Sim
ple
sta
bility
Forc
e
Snap-through
Unloading path
0
Central displacement
Forc
eSnap-through
Unloading path
0
Applications
top related