VSP Workshop 2016 OpenVSP Parasite Drag Build Up Presented by: - - PowerPoint PPT Presentation

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VSP Workshop 2016 OpenVSP Parasite Drag Build Up Presented by: - - PowerPoint PPT Presentation

May 26, 2023 664 likes •798 views

1 VSP Workshop 2016 OpenVSP Parasite Drag Build Up Presented by: Bryan Schmidt Empirical Systems Aerospace, Inc. VSP Workshop 2016 Aug. 23 rd 25 th Empirical Systems Aerospace, Inc., Oceano, CA www.esaero.com NNX09CC86P SBIR Review,

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SLIDE 1

NNX09CC86P SBIR Review, Presented to NASA, July 7th, 2009 VSP Workshop 2016 Aug. 23rd – 25th 1 Empirical Systems Aerospace, Inc., Oceano, CA www.esaero.com

VSP Workshop 2016 OpenVSP – Parasite Drag Build Up

Presented by: Bryan Schmidt Empirical Systems Aerospace, Inc.

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SLIDE 2

NNX09CC86P SBIR Review, Presented to NASA, July 7th, 2009 VSP Workshop 2016 Aug. 23rd – 25th 2 Empirical Systems Aerospace, Inc., Oceano, CA www.esaero.com

Overview

  • Uses existing geometry, equations for friction coefficient, form factor

equations, and flow conditions to create a full parasitic drag build up

  • f the selected components
  • Research done to give user plenty of options for calculated friction

coefficient and calculated form factor

– However, manual input is also available

  • User can freestream flow parameters manual or use a standard

atmosphere model

  • Exports table data to organized CSV file
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SLIDE 3

NNX09CC86P SBIR Review, Presented to NASA, July 7th, 2009 VSP Workshop 2016 Aug. 23rd – 25th 3 Empirical Systems Aerospace, Inc., Oceano, CA www.esaero.com

Friction Coefficient Equations Used

  • Laminar:

– Blasius

  • Turbulent:

– “Fluid-Dynamic Drag” by S. F. Hoerner

  • Prandtl-Karman
  • Approximate Schoenherr
  • Intrinsic Schoenherr
  • Schultz-Grunow 1

– “A Simple New Analysis of Compressible Turbulent Two-Dimensional Skin Friction Under Arbitrary Conditions” by F. M. White and G. H. Christoph

  • Schultz-Grunow 2
  • Blasius Power Law
  • Intrinsic Von-Karman
  • Prandtl-Schlichting
  • White-Christoph Best Fit
  • White-Christoph w/ Heat Transfer

– “Viscous Fluid Flow” by Frank M. White

  • White Power Law
  • Prandtl Power Law
  • ‘Exact’ Solution
  • White w/ Roughness
  • Schlichting w/ Roughness

– “Thrust and Drag: Its Prediction and Verification” by Eugene E. Covert

  • Intrinsic Karman-Schoenherr
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SLIDE 4

NNX09CC86P SBIR Review, Presented to NASA, July 7th, 2009 VSP Workshop 2016 Aug. 23rd – 25th 4 Empirical Systems Aerospace, Inc., Oceano, CA www.esaero.com

Form Factor Equations Used

  • Wing:

– “Zero Lift Drag and Drag Divergence Prediction for Finite Wings in Aircraft Design” – AIAA Paper

  • EDET Conventional
  • EDET Advanced
  • DATCOM
  • Hoerner
  • Williams
  • Kroo
  • Torenbeek

– “Thrust and Drag: Its Prediction and Verification” by Eugene E. Covert

  • Covert
  • Body:

– “Thrust and Drag: Its Prediction and Verification” by Eugene E. Covert

  • Covert Body
  • Covert Nacelle

– “Fluid Dynamic Drag” by S.F. Hoerner

  • Hoerner Streamlined

– “Synthesis of Subsonic Airplane Design” by E. Torenbeek

  • Torenbeek
  • Shevell
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SLIDE 5

NNX09CC86P SBIR Review, Presented to NASA, July 7th, 2009 VSP Workshop 2016 Aug. 23rd – 25th 5 Empirical Systems Aerospace, Inc., Oceano, CA www.esaero.com

Features

  • Able to pull Swet and Lref directly from individual geometries
  • Copies any geoms created through symmetry, copying any user inputs
  • Optional inputs for surface roughness and heat transfer ratios
  • Can pull Sref directly from model or manually input
  • Excrescense drag input for additional factors not captured in VSP

geometry

  • Export to organized CSV file
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SLIDE 6

NNX09CC86P SBIR Review, Presented to NASA, July 7th, 2009 VSP Workshop 2016 Aug. 23rd – 25th 6 Empirical Systems Aerospace, Inc., Oceano, CA www.esaero.com

Order of Operations 1

Add and Edit Geoms Edit Options as Desired

2

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SLIDE 7

NNX09CC86P SBIR Review, Presented to NASA, July 7th, 2009 VSP Workshop 2016 Aug. 23rd – 25th 7 Empirical Systems Aerospace, Inc., Oceano, CA www.esaero.com

Order of Operations – Cont. 3

Options as Desired

4

Calculate Cd0

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SLIDE 8

NNX09CC86P SBIR Review, Presented to NASA, July 7th, 2009 VSP Workshop 2016 Aug. 23rd – 25th 8 Empirical Systems Aerospace, Inc., Oceano, CA www.esaero.com

Order of Operations – Cont. 5 Final Results

  • Use scrollbar or

expand window to see rest of data

  • Press “Export to CSV”

to output the data into an organized CSV file

  • Changes to

Freestream properties can be changed from here to witness changes to Cd0

  • If Geoms are added,

everything is cleared and must calculate again

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SLIDE 9

NNX09CC86P SBIR Review, Presented to NASA, July 7th, 2009 VSP Workshop 2016 Aug. 23rd – 25th 9 Empirical Systems Aerospace, Inc., Oceano, CA www.esaero.com

DEMO

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SLIDE 10

NNX09CC86P SBIR Review, Presented to NASA, July 7th, 2009 VSP Workshop 2016 Aug. 23rd – 25th 10 Empirical Systems Aerospace, Inc., Oceano, CA www.esaero.com

Questions?

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SLIDE 11

NNX09CC86P SBIR Review, Presented to NASA, July 7th, 2009 VSP Workshop 2016 Aug. 23rd – 25th 11 Empirical Systems Aerospace, Inc., Oceano, CA www.esaero.com

Contact Information

Bryan Schmidt Bryan.Schmidt@esaero.com