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National Aeronautics and Space Administration

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.

Validation of Vortex Lattice, CS 2

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Motivation for Research

Validation of Vortex Lattice, CS 3

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.

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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

Validation of Vortex Lattice, CS 4 Figure ¡C-­‑A13.2-­‑4 ¡from ¡Aircra5 ¡Dynamics ¡From ¡Modeling ¡to ¡Simula?on ¡by ¡Marcello ¡R. ¡Napolitano ¡

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Good Information Is Hard To Come By

Validation of Vortex Lattice, CS 5 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 ¡

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Curtis Scholz’s OVSP Learjet 24 Model

Validation of Vortex Lattice, CS 6

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VorView Analysis: Model Comparison – Learjet 24

Validation of Vortex Lattice, CS 7

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Meta-geometry Comparison – Learjet 24

Validation of Vortex Lattice, CS 8

Background ¡(transparent) ¡= ¡Created ¡Model ¡ Front ¡(solid) ¡= ¡Provided ¡Model ¡ ¡

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VorView Analysis: Curtis’ Learjet 24

Validation of Vortex Lattice, CS 9

v Aerodynamic Coefficients

✧ Surface Pressure Integration ✧ Trefftz Plane

Wake Integration

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VorView and VSPaero Surface Pressure Integration Validation: Curtis’ Learjet 24

Validation of Vortex Lattice, CS 10

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VorView and VSPaero Trefftz Plane Integration Validation: Curtis’ Learjet 24

Validation of Vortex Lattice, CS 11

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VorView and VSPaero Comparison: Curtis’ Learjet 24 VorView VSPaero

Validation of Vortex Lattice, CS 12

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Final Thoughts

Validation of Vortex Lattice, CS 13

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.