Aerospace
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Browsing Aerospace by Subject "'Aerodynamics (excl. Hypersonic Aerodynamics)'"
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Item Open Access Air jet flow control on pitching aerofoils(Cranfield University, 2019-07-08 09:09) Prince, Simon; Green, Richard; Khodaglian, VahikExperimental data on the effect of steady and pulsed air jet vortex generator blowing on a RAE9645 aerofoil section in dynamic stall.Item Open Access Assessment of Turbulence Models for Transonic / Supersonic Smooth Surface Separation(Cranfield University, 2021-06-21 13:14) Prince, Simon; González caballero, Roberto; Di Pasquale, DavideA systematic comparison of the principle modern turbulence prediction methods for the solution of the Navier-Stokes equations for the calculation of high speed flows about slender forebodies at low to moderate angle of attack is presented. This class of flow involves smooth surface turbulent boundary layer separation resulting in steady symmetric leeside vortices, and also the formation of embedded shock waves from the displacement effect of the large vortices in supersonic flow. As such this flow is both complex and highly sensitive to the state of the boundary layers on the body. This study revealed that the method which most consistently provides accurate predictions of the overall forces and moments on the body, the most accurate distribution of surface pressure and can most accurately resolve the flow features, including leeside vortices and embedded shock wave features, is the Solution Adaptive Simulation method. Detached Eddy Simulation and the Reynold Stress Model, which would be expected to provide superior accuracy over the RANS based linear eddy viscosity models, on the whole, failed to provide better predictions. In fact, the k-omega Realizable and k-omega SST turbulence models provided data which was almost as consistently accurate as the Solution Adaptive Simulation method. The standard k-omega turbulence model appears to be completely unsuitable for the computation of this class of high speed flow problem, and this may be associated with the poor initial / default prescription of the value of omega at the far-field boundary.Item Open Access Cranfield DrivAer] CAD_Pack_1 Main Body(Cranfield University, 2018-04-10 16:30) Francisco Soares, Renan; Garry, Kevin; Holt, JennyMain Body CAD Pack (35% scaled-version), including:1. DrivAer_hp - Main_body (S):Main-body surface, with two cuttings for Rear-end and Diffuser CAD Pack.2. DrivAer_hp - Main_body (S) (diffuser lid):'Diffuser lid' surface, which matches the Main-body's Diffuser cutting in order to complete the Main-body, smooth underfloor version (S).CAD files available in IGS, STEP, STL, and Parasolid formats. All geometries are provided in [mm].Notation:(S) = [modified] Smooth Underfloor CAD designed and uploaded by:Renan F Soares - PhD in Aerospace Applied Aerodynamics Group Cranfield University, United KingdomItem Open Access [Cranfield DrivAer] CAD_Pack_2 Rear-end (Standard DrivAer)(Cranfield University, 2018-04-10 16:30) Francisco Soares, Renan; Garry, Kevin; Holt, JennyRear-end CAD Pack (35% scaled-version), including:1. DrivAer - Rear-end Fastback (F):Rear-end surface equivalent to a generic Fastback car model.2. DrivAer - Rear-end Notchback (N):Rear-end surface equivalent to a generic Notchback car model.3. DrivAer - Rear-end Estateback (E):Rear-end surface equivalent to a generic Estateback car model.CAD files available in IGS, STEP, STL, and Parasolid formats. All geometries are provided in [mm].Notation:(F) = Fastback(N) = Notchback(E) = EstatebackReference:1. DrivAer Model : “Geometry”. Institute of Aerodynamics and Fluid Mechanics. Technical University of Munich. http://www.aer.mw.tum.de/en/research-groups/automotive/ drivaer/geometry/.-CAD adapted and uploaded by:Renan F Soares - PhD in AerospaceApplied Aerodynamics GroupCranfield University, United KingdomItem Open Access [Cranfield DrivAer] CAD_Pack_3 Mirrors(Cranfield University, 2018-04-10 16:30) Francisco Soares, Renan; Garry, Kevin; Holt, JennyMirrors CAD Pack (35% scaled-version), including:1. DrivAer - Mirrors (base plate only) (woM):DrivAer mirrors, base plate only.2. DrivAer - Mirrors (standard) (wM):DrivAer mirrors, standard version.CAD files available in IGS, STEP, STL, and Parasolid formats. All geometries are provided in [mm].Notation:(woM) = without external mirrors.(wM) = with external mirrors. --CAD designed and uploaded by:Renan F Soares - PhD in Aerospace Applied Aerodynamics Group Cranfield University, United KingdomItem Open Access [Cranfield DrivAer] CAD_Pack_6 Strakes(Cranfield University, 2018-04-10 16:32) Francisco Soares, Renan; Knowles, Andrew; Garry, Kevin; Holt, JennyStrakes CAD Pack (35% scaled-version), including:1. DrivAer_hp - Strakes (Lower-pair S-size):Lower pair of strakes, in nominal Small size.2. DrivAer_hp - Strakes (Lower-pair M-size):Lower pair of strakes, in nominal Medium size.3. DrivAer_hp - Strakes (Lower-pair L-size):Lower pair of strakes, in nominal Large size.4. DrivAer_hp - Strakes (Upper-pair S-size):Upper pair of strakes, in nominal Small size.5. DrivAer_hp - Strakes (Upper-pair M-size):Upper pair of strakes, in nominal Medium size.6. DrivAer_hp - Strakes (Upper-pair L-size):Upper pair of strakes, in nominal Large size.CAD files available in IGS, STEP, STL, and Parasolid formats. All geometries are provided in [mm].Notation:(Lower-set) = lower pais of strakes.(Upper-set) = upper pais of strakes.(Full-set) = both lower and upper pairs of strakes. CAD designed and uploaded by: Renan F Soares - PhD in Aerospace Applied Aerodynamics Group Cranfield University, United KingdomItem Open Access [Cranfield DrivAer] CAD_Pack_7 Spoilers(Cranfield University, 2018-04-10 16:32) Francisco Soares, Renan; Golons Olives, Sergio; Garry, Kevin; Holt, JennySpoilers CAD Pack (35% scaled-version), including:1. DrivAer_hp - Spoiler (spL040 spA40): Spoiler pack with plate size of 40 mm, set at 40 deg.2. DrivAer_hp - Spoiler (spL080 spA40):Spoiler pack with plate size of 80 mm, set at 40 deg.3. DrivAer_hp - Spoiler (spL120 spA40):Spoiler pack with plate size of 120 mm, set at 40 deg.4. DrivAer_hp - Spoiler (spL080 spA20):Spoiler pack with plate size of 80 mm, set at 20 deg.5. DrivAer_hp - Spoiler (spL080 spA60):Spoiler pack with plate size of 80 mm, set at 60 deg.CAD files available in IGS, STEP, STL, and Parasolid formats. All geometries are provided in [mm].Notation:(spL) = length of the spoiler plate.(spA) = angle of the spoiler plate, in reference to the ground. CAD designed and uploaded by:Renan F Soares - PhD in AerospaceApplied Aerodynamics GroupCranfield University, United KingdomItem Open Access [Cranfield DrivAer] CAD_Pack_8 Diffusers(Cranfield University, 2018-04-10 16:33) Francisco Soares, Renan; Goñalons Olives, Sergio; Garry, Kevin; Holt, JennyDiffusers CAD Pack (35% scaled-version), including:1. DrivAer_hp - Diffuser (side plates):Side plates used to generate an diffuser channel for slopping angles protruding the DrivAer main body (i.e. diffA < 7 deg).2. DrivAer_hp - Diffuser (diffA00 plain):Diffuser pack with a plain, sloping surface of 0 deg (i.e. 'no-diffuser' case).3. DrivAer_hp - Diffuser (diffA05 plain):Diffuser pack with a plain, sloping surface of 5 deg.4. DrivAer_hp - Diffuser (diffA10 plain):Diffuser pack with a plain, sloping surface of 10 deg.5. DrivAer_hp - Diffuser (diffA16 plain):Diffuser pack with a plain, sloping surface of 16 deg.6. DrivAer_hp - Diffuser (diffA05 SEP_on):Diffuser pack with a plain, sloping surface of 5 deg and 3 equidistant separators ('fins').7. DrivAer_hp - Diffuser (diffA10 SEP_on):Diffuser pack with a plain, sloping surface of 10 deg and 3 equidistant separators ('fins').8. DrivAer_hp - Diffuser (diffA16 SEP_on):Diffuser pack with a plain, sloping surface of 16 deg and 3 equidistant separators ('fins').CAD files available in IGS, STEP, STL, and Parasolid formats. All geometries are provided in [mm].Notation:(diffA) = nominal diffuser angle.(SEP_on) = use of longitudinal separators ('fins').-------------------------------------------------CAD designed and uploaded by:Renan F Soares - PhD in AerospaceApplied Aerodynamics GroupCranfield University, United KingdomItem Open Access Dataset for SAE 2018-01-0725 "On the Aerodynamics of an Enclosed-Wheel Racing Car: an assessment and proposal of add-on devices for a fourth, high-performance configuration of the DrivAer model"(Cranfield University, 2018-04-10 08:56) Francisco Soares, Renan; Garry, Kevin; Holt, JennyExpansion dataset for the SAE Technical Paper 2018-01-0725, which includes:- experimental results (Figures 10 to 18) in spreadsheet format.- summary of experimental testing conditions per run.- details of statistical analysis per blocking factor (i.e. group of testing cases).- addition of corrected coefficients for wall interference (wind tunnel area blockage of 10.2%).SUMMARY:A. Front bumper splitter:Figure 10. Front bumper splitter: influence of splitter size on aerodynamic loads.B. Forebody lateral strakes:Figure 11. Forebody lateral strakes: influence of strake size on aerodynamic loads.Figure 12. Forebody lateral strakes: influence of assembly set on aerodynamic loads.C. Rear-end spoiler:Figure 13. Rear-end spoiler: influence of spoiler angle on aerodynamic loads.Figure 14. Rear-end spoiler: influence of spoiler size on aerodynamic loads.D. Underfloor diffuser:Figure 15. Underbody diffuser: influence of the diffuser angle on aerodynamic loads.Figure 16. Underbody diffuser: influence of longitudinal separators on aerodynamic loads.E. DrivAer high-performance Fastback configuration:Figure 17. High-performance Fastback DrivAer configuration: comparison of aerodynamic loads against the standard version.Figure 18. High-performance Fastback DrivAer configuration: Reynolds number sensitivity of aerodynamic loads.SUPPLEMENTARY MATERIALS:I. Publication:Soares, R., Knowles, A., Goñalons Olives, S., Garry, K. et al., "On the Aerodynamics of an Enclosed-Wheel Racing Car: An Assessment and Proposal of Add-On Devices for a Fourth, High-Performance Configuration of the DrivAer Model," SAE Technical Paper 2018-01-0725, 2018, https://doi.org/10.4271/2018-01-0725.II. CAD geometry:Soares, Renan francisco; Olives, Sergio Goñalons; Knowles, Andrew Paul; Garry, Kevin; Holt, Jenny (2018): DrivAer hp-F: the CAD geometry pack. figshare. Collection. doi:10.17862/cranfield.rd.c.3969120.Item Open Access Extremum Seeking Control for Truck Drag Reduction(Cranfield University, 2018-06-20 16:09) Whidborne, James; Garry, KevinMATLAB/Simulink codes for "Extremum Seeking Control for Truck Drag Reduction" G Papageorgiou, J Barden, J Whidborne, K Garry 12th UKACC International Conference on Control Sheffield, UK, 5th - 7th September 2018 Videos: converge.mp4 - shows ESC controller convergence with Speed controller reference, Vr=24 m/s Initial deflector height limits, deltaH=1.16 Gradient and wind speed are set to zero