A theoretical analysis of the flexural wrinkling of a honeycomb sandwich beam with laminated faces having non-linear stress-strain behaviour is presented. Appropriate tangent moduli are used in the constitutive equations for the compression face and a double iteration technique is used to calculate wrinkling loads. Numerical results are given for sandwich beams with unidirectional and cross-ply carbon fibre reinforced plastic (CFRP) faces. Experimental failure loads of sandwich beams are compared with theoretical predictions, and, in general, the agreement between the two is good.

Measurements are presented of the static pressure, total pressure, swirl and three-dimensional turbulence in the flow through an S-curved rectangular duct mounted in a wind tunnel at different incidences, yaw angles and mass flow ratios. The results show that at high incidence there is a large vortex around an area of flow separation after the first bend and a pair of contra-rotating vortices in the flow after the second bend. The distortion of total pressure at the exit of the S-duct is significantly high, and the corresponding three-dimensional turbulence is up to 16.7%. Appreciation of the existence of this type of flow is important in the field of air intake design for jet aircraft.

The problem considered is that of Poiseuille flow in a two dimensional channel impinging on a flat plate placed symmetrically between the two channel walls so as to bifurcate the channel into two equal branches. The results of a theoretical study of the problem are presented and analysed to portray in full details the characteristics of the flow before and after the bifurcation point. In particular the effects of the flow divider on the flow near the channel walls and the effects of the channel walls on the flow near the flow divider are examined.

Simulations of vortex sheet dynamics by the discrete vortex method have often shown a growing randomness of the discrete vortices. This paper describes two techniques which attempt to mitigate this tendency whilst preserving the overall structure of the vortex sheet. Clusters of vortices near the points of concentration are amalgamated into a single equivalent vortex and a process of repeated rediscretization of the remaining part of the sheet maintains the integrity of its representation. Use of these techniques allow the flow model to be followed beyond previous expectations, without undue randomisation of the vortex positions. The effects of using these techniques on the overall vortex sheet development are fully investigated in order to validate their use in future investigations.

The flow around a normal flat plate close to a large plane surface has been investigated for a range of boundary-layer thickness on the plane surface of 0.72 to 2.53 times the plate height, h. As the gap between the plate and the plane surface is reduced below about 0.55h vortex shedding from the plate is inhibited by the presence of the plane surface. Boundary layer thickness has little effect on the gap at which this occurs, but does affect the strength and frequency of vortex shedding at greater gaps. As the gap between the plate lower edge and the plane surface is decreased towards the critical value of 0.55h, both vortex strength and Strouhal number are more significantly affected when the approaching boundary layer is thin. It is not clear whether this is a result of shear or increased turbulent intensity.