We held a presentation
(Tansient fluid structure interaction) during the NAFEMs Seminar:
Simulation of Coupled Flow Phenomena (Multifield FSI) - Applications and
Trends Event Type: Seminar, Location: Wiesbaden, Germany Date: May 8,
2006, Abstract:
Transient Fluid Structure Interaction,
Dr. Ulrich Heck
In transient fluid structure
interactions soft structures often abate the stiffness of the system.
Thereby, important physical properties like the wave speed in the fluid
can be altered by several orders of magnitude and the coupled systems
can provide a completely different physical characteristic. In numerical
FSI analysis, these kinds of problems are difficult to solve using
partitioned approaches due to the separate treatment of the fluid and
solid region. If a strong interaction of relevant physical timescales
takes place, direct solution methods often perform better by taking
those effects into consideration.
Configurations where these effects can
occur are found in a wide scope of FSI applications. Two examples are
presented, first is the flow through arteries, where the elastic artery
wall highly reduces the pulse wave velocity. In this section a
validation case is set up. In the second step, the flow through a
constricted vessel is discussed. Additional non-linear effects like
contact or non-linear rubber-like material behaviour are taken into
consideration. Further, the high frequency response of hydraulic engine
mounts (HEMs) is investigated by numerical and experimental methods. The
numerical model reproduces the important dynamic effects for HEM design
and the comparison with experimental data shows a good agreement,
considering the simplified dynamic material behaviour of the rubber.
