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International Journal of Aerodynamics (4 papers in press)
Simulations of shallow water surface waves and comparison with water table experiments by M. Hafez, A. Chuen, A. Burkhead Abstract: . Keywords: .
Aerodynamic investigation of blunt and slender bodies in ground effect using OpenFOAM by Umberto Ravelli, Marco Savini Abstract: The main purpose of this numerical study is to assess the capability of OpenFOAM in predicting aerodynamic performance of blunt and slender devices for automotive and motorsport applications such as a diffuser-equipped blunt body and a F1 single element front wing in ground effect. Reynolds Averaged Navier-Stokes (RANS) simulations were carried out at different values of ride height and diffuser angle/angle of attack: predictions of integral quantities, such as drag (CD) and lift (CL) coefficients were validated against the available set of experimental data from Loughborough and Southampton Universities. Results put in evidence that OpenFOAM is suitable for fulfilling the goal of this study, even if the entire workflow (from meshing to calculation) is not user-friendly: the success of the simulations strongly depends on quality of the mesh, turbulence model, type of solver and numerical setup.
Keywords: open-source; OpenFOAM; CFD; aerodynamics; ground effect; motorsport; automotive; diffuser; blunt body; wing; ride height; Reynolds averaged Navier-Stokes; RANS. DOI: 10.1504/IJAD.2019.10019148
Solar Powered Unmanned Aerial Vehicle: A numerical approach in improving solar cell performance by Rowayne E. Murzello, Mehdi Nazarinia, Amanda J. Hughes Abstract: Solar powered unmanned aerial vehicles (SPUAV) have numerous applications and are considered as environmentally friendly vehicles since they only use suns energy for propulsion. In this study, a conceptional design was proposed which integrates a cooling duct inside the airfoil to provide cooling for the backside of solar cells at Reynolds number of 206,000 at an altitude of 1 km. Duct dimensions were first optimised using a MATLAB program. Computational fluid dynamics (CFD) was used to investigate the lift and drag characteristics of the modified airfoil. Heat transfer analysis on the solar array using CFD was performed to obtain solar cell temperatures of the baseline and modified design. Results obtained from the cruising conditions showed that the maximum temperature drop was 3 Keywords: cooling duct; computational fluid dynamics; CFD; unmanned aerial vehicle; solar powered UAV; heat transfer enhancement; solar cell. DOI: 10.1504/IJAD.2019.10019804
Connection between rear-end extensions and yaw response of a passenger vehicle by Lennert Sterken, Simone Sebben, Lennart Löfdahl Abstract: This paper aims to investigate the sensitivity of the rear-end design to the yaw response of a passenger vehicle. To accomplish this, rear-end extensions are attached to the base perimeter of a Sports Utility Vehicle (SUV). The intention of the extensions is to improve and to smooth out the pressure recovery such that a more stable wake is created. The extensions facilitate the implementation of configuration changes with respect to design, inclination angle and length. To control the separation conditions of the flow entering the near-wake, two different designs are studied. The yaw response is analysed through the global forces and flow field measurements presented as surface- pressure distributions and wake plane measurements of local drag. The results show that the rear-end can be designed as to control the yaw response so the aerodynamic drag is minimized and passenger vehicle stability is maintained. Keywords: Full-scale wind tunnel experiments; Yaw response; Drag reduction; Rear-end stability; Rear-end design.