A pressure-based implicit procedure to solve the Euler and Navier-Stokes equations on a nonorthogonal mesh with collocated finite volume formulation is described. The boundedness criteria for this procedure are determined from Normalized Variable diagram (NVD) scheme.The procedure incorporates the ε−k eddy-viscosity turbulence model. The algorithm is tested for inviscid and turbulent transonic ...

The DSTO water tunnel’s balance and rotary support mechanism provides a measurement capability for longitudinal dynamic derivatives. This report documents the underlying theory and computational implementation of a technique which uses the water tunnel for determination of normal force and pitching moment coefficient derivatives with respect to angle of attack, nondimensional pitch rate and ang...

The angle and number of wind turbine blades. used for testing is a vertical Darrieus-H type with variations in the blades 2, 3, 4. Blades NACA 4415 specifications, speeds 4 m/s, 5 6 7 m/s s, 8 m/s. source using fan. Variations attack are 0o, 10o, 20o, 30o. blade made sea sengon wood. At position attack, 10o rotates faster due to influence lifting force 0o difficult rotate because straight direc...

Airplanes and helicopters use high aspect ratio wings to reduce the power required to fly, but must operate at low angle of attack to prevent flow separation and stall. Animals capable of slow sustained flight, such as hummingbirds, have low aspect ratio wings and flap their wings at high angle of attack without stalling. Instead, they generate an attached vortex along the leading edge of the w...

BACKGROUND AND OBJECTIVE After a single unilateral acute primary angle-closure glaucoma attack, retinal nerve fiber layer (RNFL) may be thinned. The current study measured the RNFL thickness using optical coherence tomography in eyes with normal visual fields after recovery from a single attack of acute primary angle-closure glaucoma. PATIENTS AND METHODS Twenty-one patients and age-matched c...