Publication: A numerical study on transverse gusts at low Reynolds number
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Publication date
2018-09
Defense date
2018-10-08
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Abstract
The emerging design of MAVs has arisen a great interest in making research about
unsteady Aerodynamics of
flapping wings at low Re. When MAVs are
flying in
real conditions in the atmosphere, they have to face winds' unsteadiness such as
continuous turbulence or discrete gusts.
The purpose of this thesis is to better understand the physics behind a gust encounter
at low Reynolds number. For that, direct numerical simulations are carried
out for different transverse gusts with large amplitudes, where the gust velocities
are comparable to the freestream velocity. In addition, two different setups are
prepared for DNSs and their results are compared with similar experiments from
the literature. A third setup for DNS is presented conceptually as well.
For the DNS results, a parametric study is done in terms of gust intensity. After
analyzing the aerodynamic forces during the gust encounters, some models are
developed to predict the lift force during and after the gust encounter.
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Keywords
Aerodynamics, Reynolds number, Micro Air Vehicle (MAV), Simulation, Direct Numerical Simulation (DNS), Gust analysis, Computational fluid