Master of science Thesis Download Page
- Hong-Te, Hsu (2002)
Modelling a jet in ground effect with vertical surfaces, with
particular emphasis on shipborne operations
M.Sc. Thesis, Department of Aerospace Engineering,
University of Southampton, UK
here to download the PDF format of thesis
The numerical simulation of predicting the full three dimensional mean flow
field around a V/STOL aircraft whilst operating in the presence of carrier ship
structure and side winds has been carried out by using unstructured grids in a
parallel computation solver, based on Flux-Corrected Transport algorithm.
The V/STOL aircraft is modelled by dual impinging jets from nozzles. The
computational method uses a three-dimensional finite-volume calculation.
The procedure of quadratic upstream difference weighted difference scheme
was used to calculate the convection terms and the standard k- e turbulence
model was used to calculate the distribution of the Reynolds Stress. The
IRIDIS, the Beowulf clusters of Southampton University, were used to
implement parallel computation.
Detailed pressure distribution results of the simulation are presented for dual
jets with velocity ratio ranging from 7.77 to 14.58 at a height of 6.67 nozzle
diameters at three different side winds. The jet model and the ship model are
combined to yield one flow solution, which, due to the severe non-linearities of
the problem, cannot be achieved by superposition. The calculation reveals the
existence of large regions of low pressure, associated with upstream
recirculating flow region, due to the interaction between upstream wall jet and
the cross flow, and the airwakes, due to the yaw angle-depend largely
separated flow behind sharp edges of ship.
- Key Words: Impinging Jet, Ground Effect, CFD, Ship Airwake, Ground Vortex,