The Use of VSAero CFD Tool in the UAV Aerodynamic Project
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1 DIASP Meeting #6 Turin 4-5 February 2003 The Use of VSAero CFD Tool in the UAV Aerodynamic Project Alberto PORTO Massimiliano FONTANA Porto Ricerca FDS Giulio ROMEO - Enrico CESTINO Giacomo FRULLA Politecnico di Torino, Dept. of Aerospace Eng.
2 DIASP Porto Ricerca S.n.c. Monza, (Milano) Italy Providers of CFD Software Engineering Research Consulting Services
3
4 Property of Dept. Of Aerospace Eng., Politecnico di Torino. All rights reserved DIASP Flow Analysis Components CAD GRID GENERATION AMIGRID SPIN GRIDALL FLOW SOLUTION VSAERO USAERO MGAERO NSAERO POST PROCESSING OMNIPLOT OMNI3D TECPLOT
5 DIASP VSAERO Subsonic, Quasi-Steady Flow Integral Panel/Boundary Layer Method Complex Geometries Thick and Vortex Lattice Surfaces Wake Modeling Performance Stability and Control
6 Boeing Lateral Symmetry 4100 Body Panels 3900 Wake Panels 1 Wake Iteration 3 Viscous Iterations CPU Requirement: SGI 4D/35 (R3000) 1.5 Hours SGI (R10000) 5 Minutes
7 Boeing
8 DIASP Akron - Airship the modified Stratford criteria of Mendenhall35 have been added to VSAERO to find the cross flow separation line.
9 DIASP Akron - Airship
10 Racing car LANGLEY FULL SCALE WIND TUNNEL LFST CFD analysis during the designee process research Wing tunnel drag coefficient: CFD drag coefficient prediction: Drag coefficient error: 4%
11 VICTORY Challenge Americas Cup Sailboat CFD analysis during the designed process research AC-base AC-2 Vsaero AC-2 Tank test Speed Percentage difference in drag on two different Americas Cup yachts calculated with VSAERO and tested in a towing tank CFD Wave height calculation Speed Dif. Vsaero % error in drag vs. speed for the an upwind case
12 Heliplat Solar-powered UAV ASI & EC (Helinet) projects Span:73m; TOGM:750kg; Mass PL:100kg Power PL:1kW; Req. Power=6 kw; TAS=71 km/h; Altitude: 17km; Endurance: 6 months Effic. s.c.:20%; Effic. f.c.+elect:60% Trademark of Dept. of Aerospace Engineering of Politecnico di Torino Property of Dept. Of Aerospace Eng., Politecnico di Torino. All rights reserved
13 Heliplat CASA Space- EADS POLITO / ARCHEMIDE Trademark of Dept. of Aerospace Engineering of Politecnico di Torino Property of Dept. Of Aerospace Eng., Politecnico di Torino. All rights reserved
14 Heliplat Trademark of Dept. of Aerospace Engineering of Politecnico di Torino Property of Dept. Of Aerospace Eng., Politecnico di Torino. All rights reserved
15 Trademark of Dept. of Aerospace Engineering of Politecnico di Torino DIASP Heliplat Preliminary wing - optimization In the preliminary wing analysis we have tested with VSAERO three airfoils on wing solo configuration MH32, E216, FX63137 E216 show a better compromise between the airfoil Drag and the induced wing Drag
16 Trademark of Dept. of Aerospace Engineering of Politecnico di Torino DIASP Heliplat Wing airfoil geometry 2D XFOIL optimization thickness effect camber effect combined effect
17 Heliplat By Using XFOIL, the optimal airfoil HPF118 has been designed instead of E216.The good performances of HPF118 are also demonstrated by experimental investigation in the Laminar Wind Tunnel in Stuttgart. Property of Dept. Of Aerospace Eng., Politecnico di Torino. All rights reserved
18 Heliplat The optimization of wing planform have the intention to minimize induced drag. Indeed it was found that some wing planforms increase the friction drag more than the induced drag reduction. Each wing have constant span and equal surface, i.e. AR=cost. Aerodynamics Efficiency E Rectangular Wing- FX PIANTA0- FX PIANTA0- E P IANTA0- HPF P IANTA8- HPF PIANTA8 twisted- HPF118 family CL Property of Dept. Of Aerospace Eng., Politecnico di Torino. All rights reserved
19 DIASP Why we have choose to use Vsaero panel methods technology? Contain the right physics Handle complex & arbitrary geometry Resolve all important physical & geometric length scale Reliably accurate numerics Timely Properly validated Can be run many, many times
20 DIASP Heliplat CP Cf visualization all over the Airplane Property of Dept. Of Aerospace Eng., Politecnico di Torino. All rights reserved
21 Heliplat Accurate pressure distribution on Heliplat complete configuration CP Station cut CP buttline cut Property of Dept. Of Aerospace Eng., Politecnico di Torino. All rights reserved
22 Heliplat The geometry panels are divided into several groups in order to identify the single part contribution to the total DRAG and LIFT coefficient Trademark of Dept. of Aerospace Engineering of Politecnico di Torino Property of Dept. Of Aerospace Eng., Politecnico di Torino. All rights reserved
23 Heliplat Propeller - analysis Property of Dept. Of Aerospace Eng., Politecnico di Torino. All rights reserved Skin friction coefficient
24 DIASP Aileron Heliplat Derivatives study Stabilizer Rudder Static derivatives Cm_δe ; CL_δe ; CFy_δa ; Cl_δa ; Cn_δa ; CFy_δr ; Cl_δr ; Cn_δr Property of Dept. Of Aerospace Eng., Politecnico di Torino. All rights reserved
25 Heliplat DIASP Derivatives study Roll rate p Pitch rate q Dynamic derivatives (p q r): Cl_p ; Cn_p ; Cy_p; CL_q ; Cm_q ; Cn_r ; Cy_r ;Cl_r Property of Dept. Of Aerospace Eng., Politecnico di Torino. All rights reserved
26 DIASP Conclusions Vsaero is an excellent tool in order to design the best package to fulfil the design targets. Good correlation between numeric and experimental data. calculation quickness
Prof. Ing. Giulio ROMEO, Politecnico di Torino (Turin Polytechnic University), Dept. of Aerospace Eng. giulio.romeo@polito.it
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