50 research outputs found
Modelling of Transonic Shallow Cavity Flows, and Store Release Simulations from Weapon Bays
This paper aims to obtain more insight in the physics of cavit
y
flows. CFD results are analysed using a superposition of refle
cted
acoustic waves driven by the cavity flow showing clearly the r
elative
amplitude, and the time modulation of cavity tones. The tona
l, and
a part of the broadband noise, is found to be driven by the turb
u-
lent length scales, disabling the phase superposition of th
e smaller
wavelength. This can be seen as a way to complement the estab-
lished Rossiter formula. In addition Scale-Adaptive Simul
ations of
store release from weapon bays using overset grids are prese
nted. A
six-degree-of-freedom model is coupled with the HMB3 flow so
lver,
and store release simulations are performed for a finned stor
e inside
an idealised bay. It is found that the trajectories of stores
released
from the cavities are affected by the mean flow field, the standin
g
waves, and the dynamics of the shear layer formed along the ca
vity
opening