Comparison and Validation of Vortex Lattice Aerodynamic Analysis for - PowerPoint PPT Presentation

Comparison and Validation of Vortex Lattice Aerodynamic Analysis for the Learjet 24 Curtis Scholz & Andrew Hahn ASAB Systems Analysis and Concepts Directorate 08/06/2014 National Aeronautics and Space Administration

Caveats v This was done by a summer student over a few weeks. v Results are to be considered to be preliminary. v VSPaero is still in development and is at an Alpha state. ✧ Curtis’ work, along with 5 other students stress tested VSPaero, providing excellent feedback to the developer. National Aeronautics and Space Administration Validation of Vortex Lattice, CS 2

Motivation for Research v Aerodynamic analysis performed by the Georgia Tech team competing in the AIAA Design, Build, Fly competition indicated widely varying accuracy of Vortex Lattice flow solvers. National Aeronautics and Space Administration Validation of Vortex Lattice, CS 3

Measure Drawings for Unknown Parameters (CANVAS or AutoCAD) v Allow dimensioning of scaled 3-view drawings v Check Self Consistency v Measure: ✧ Lengths ✧ Areas ✧ Angles ✦ Sweep ✦ Bezier Tangent ✧ Not Tangent Strengths Figure ¡C-­‑A13.2-­‑4 ¡from ¡Aircra5 ¡Dynamics ¡From ¡Modeling ¡to ¡Simula?on ¡by ¡Marcello ¡R. ¡Napolitano ¡ National Aeronautics and Space Administration Validation of Vortex Lattice, CS 4

Good Information Is Hard To Come By Figure ¡C-­‑A13.4 ¡from ¡Aircra5 ¡Dynamics ¡From ¡Modeling ¡to ¡Simula?on ¡by ¡Marcello ¡R. ¡Napolitano ¡ hEp%3A%2F%2Fwww.pprune.org%2Farchive%2Findex.php%2Ft-­‑486918.html&ei=5ZjrU6_BIYqNyATqg4DgDQ&bvm=bv. 72938740,d.aWw&psig=AFQjCNHpwk1uIvhPF1bO12hvn9wm-­‑a6Gag&ust=1408034742416898 ¡ National Aeronautics and Space Administration Validation of Vortex Lattice, CS 5

Curtis Scholz’s OVSP Learjet 24 Model National Aeronautics and Space Administration Validation of Vortex Lattice, CS 6

VorView Analysis: Model Comparison – Learjet 24 National Aeronautics and Space Administration Validation of Vortex Lattice, CS 7

Meta-geometry Comparison – Learjet 24 Background ¡(transparent) ¡ = ¡Created ¡Model ¡ Front ¡(solid) ¡= ¡Provided ¡Model ¡ ¡ National Aeronautics and Space Administration Validation of Vortex Lattice, CS 8

VorView Analysis: Curtis’ Learjet 24 v Aerodynamic Coefficients ✧ Surface Pressure Integration ✧ Trefftz Plane Wake Integration National Aeronautics and Space Administration Validation of Vortex Lattice, CS 9

VorView and VSPaero Surface Pressure Integration Validation: Curtis’ Learjet 24 National Aeronautics and Space Administration Validation of Vortex Lattice, CS 10

VorView and VSPaero Trefftz Plane Integration Validation: Curtis’ Learjet 24 National Aeronautics and Space Administration Validation of Vortex Lattice, CS 11

VorView and VSPaero Comparison: Curtis’ Learjet 24 VorView VSPaero National Aeronautics and Space Administration Validation of Vortex Lattice, CS 12

Final Thoughts v This exercise provided an excellent learning experience for 6 summer students (modeling and analyzing 9 aircraft total). v This exercise provided a base validation suite that we will eventually take through all of the computational aerodynamics tools that we can lay our hands on, through RANS. v This exercise provided a stress test for VSPaero that definitely helped to improve it. v I still need to review their work, cleaning up and correcting as necessary, but I want to put the end products up on the OpenVSP website to act as guides for the community. v My organization needs to understand the cost-benefit ratio of these tools and this exercise was a great start. National Aeronautics and Space Administration Validation of Vortex Lattice, CS 13