1 VSP Workshop 2017 OpenVSP Parasite Drag Build...
Transcript of 1 VSP Workshop 2017 OpenVSP Parasite Drag Build...
NNX09CC86P SBIR Review, Presented to NASA, July 7th, 2009VSP Workshop 2017 Aug. 30th – Sep. 1st
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Empirical Systems Aerospace, Inc., Oceano, CA www.esaero.com
VSP Workshop 2017
OpenVSP – Parasite Drag Build Up
Presented by:
Bryan Schmidt
Empirical Systems Aerospace, Inc.
Work Support By:
AFRL SBIR Phase II
NNX09CC86P SBIR Review, Presented to NASA, July 7th, 2009VSP Workshop 2017 Aug. 30th – Sep. 1st
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Empirical Systems Aerospace, Inc., Oceano, CA www.esaero.com
Introduction
Goal
• Reduce the time it takes to complete a
parasitic build up for conceptual aircraft
utilizing OpenVSPs’ internal geometry
calculations
NNX09CC86P SBIR Review, Presented to NASA, July 7th, 2009VSP Workshop 2017 Aug. 30th – Sep. 1st
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Empirical Systems Aerospace, Inc., Oceano, CA www.esaero.com
Approach
• Uses existing geometry, equations for friction coefficient, form factor
equations, and flow conditions to create a full parasitic drag build up
of the selected components
– Plethora of options for calculated friction coefficient and calculated form factor
– Manually set freestream flow parameters or use a standard atmosphere model
• Export data to organized, parsable CSV file
NNX09CC86P SBIR Review, Presented to NASA, July 7th, 2009VSP Workshop 2017 Aug. 30th – Sep. 1st
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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
NNX09CC86P SBIR Review, Presented to NASA, July 7th, 2009VSP Workshop 2017 Aug. 30th – Sep. 1st
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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
NNX09CC86P SBIR Review, Presented to NASA, July 7th, 2009VSP Workshop 2017 Aug. 30th – Sep. 1st
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Empirical Systems Aerospace, Inc., Oceano, CA www.esaero.com
Order of Operations
1
Add and Edit Geoms
Edit Options as Desired
2
NNX09CC86P SBIR Review, Presented to NASA, July 7th, 2009VSP Workshop 2017 Aug. 30th – Sep. 1st
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Empirical Systems Aerospace, Inc., Oceano, CA www.esaero.com
Order of Operations – Cont.
2a 2bAdd Excrescence Edit Excrescence
NNX09CC86P SBIR Review, Presented to NASA, July 7th, 2009VSP Workshop 2017 Aug. 30th – Sep. 1st
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Empirical Systems Aerospace, Inc., Oceano, CA www.esaero.com
Order of Operations – Cont.
3
Options as Desired
4
Calculate CD0 or Export to CSV
NNX09CC86P SBIR Review, Presented to NASA, July 7th, 2009VSP Workshop 2017 Aug. 30th – Sep. 1st
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Empirical Systems Aerospace, Inc., Oceano, CA www.esaero.com
Order of Operations – Cont.
• 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
Final Results5
NNX09CC86P SBIR Review, Presented to NASA, July 7th, 2009VSP Workshop 2017 Aug. 30th – Sep. 1st
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Empirical Systems Aerospace, Inc., Oceano, CA www.esaero.com
Grouping
• Used to group the
wetted area of
geometries that
are better suited
as “one” geometry
• Can only be
attached to
parent(s) of similar
geometry type
NNX09CC86P SBIR Review, Presented to NASA, July 7th, 2009VSP Workshop 2017 Aug. 30th – Sep. 1st
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Empirical Systems Aerospace, Inc., Oceano, CA www.esaero.com
Subsurface Handling
• 3 choices for subsurface handling
– Same as parent
– Separate treatment
– Zero drag
• Separate treatment comes with the ability to control all
parameters similar to new geometry
NNX09CC86P SBIR Review, Presented to NASA, July 7th, 2009VSP Workshop 2017 Aug. 30th – Sep. 1st
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Empirical Systems Aerospace, Inc., Oceano, CA www.esaero.com
PARASITE DRAG BUILD UP DATA
Mach Altitude (ft) Vinf (ft/s) S_ref (ft^2)
0.649737 40000 629 598.00128
Temp (°F) Pressure (lbf/ft^2) Density (slug/ft^3)
-69.7 391.683791 0.000585
Lam Cf Eqn Turb Cf Eqn
Blasius Implicit Karman-Schoenerr
Component Name S_wet (ft^2) L_ref (ft) t/c or d/l FF FF Eqn Type Re (1e6) % Lam Cf (1e-3) Q (Interference Factor) f Cd % Total
Wing 1089.00712 9.808761 0.162611 1.367174 Hoerner 8169468.569 0 0.003036 1 4.520013 0.007559 0.446553
Wing_0 544.50356 9.808761 0.162611 1.367174 Hoerner 8169468.569 0 0.003036 1 2.260007 0.003779 0.223276
Wing_1 544.50356 9.808761 0.162611 1.367174 Hoerner 8169468.569 0 0.003036 1 2.260007 0.003779 0.223276
Fuse 989.029556 49.557828 0.163706 1.130066 Hoerner Streamlined Body 41275458.14 0 0.002356 1 2.633716 0.004404 0.260197
Fuse_0 989.029556 49.557828 0.163706 1.130066 Hoerner Streamlined Body 41275458.14 0 0.002356 1 2.633716 0.004404 0.260197
H-Tail 355.466618 7.001429 0.099919 1.205818 Hoerner 5831313.037 0 0.003212 1 1.376626 0.002302 0.136003
H-Tail_0 177.733309 7.001429 0.099919 1.205818 Hoerner 5831313.037 0 0.003212 1 0.688313 0.001151 0.068002
H-Tail_1 177.733309 7.001429 0.099919 1.205818 Hoerner 5831313.037 0 0.003212 1 0.688313 0.001151 0.068002
V-Tail 246.350315 9.669314 0.099919 1.205818 Hoerner 8053326.672 0 0.003043 1 0.903955 0.001512 0.089306
V-Tail_0 246.350315 9.669314 0.099919 1.205818 Hoerner 8053326.672 0 0.003043 1 0.903955 0.001512 0.089306
Excrescences
Miscellaneous Count (10000*CD) 8.5 0.00085 0
Cowl Boattail CD 0.0003 0.0003 0
Geometry Sub-Total: 9.43431 0.015776 0.932059
Excrescence Sub-Total: 0.687701 0.00115 0.067941
Totals: 10.122012 0.016926 1
Validation and Verification.
• Using Technical Report Data for
Dimensions, recreated S3-Viking
for Parasite Drag comparison
NNX09CC86P SBIR Review, Presented to NASA, July 7th, 2009VSP Workshop 2017 Aug. 30th – Sep. 1st
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Empirical Systems Aerospace, Inc., Oceano, CA www.esaero.com
Validation and Verification.
S3 Aero
Data
Report
OpenVSP
Parasite
Drag
Percentage
Difference
CD0 0.01779 0.016926 -8.51%
• Did not model
pylons and cowls,
used base
geometry
• Total Data Report
CD0 comes to
0.01779
NNX09CC86P SBIR Review, Presented to NASA, July 7th, 2009VSP Workshop 2017 Aug. 30th – Sep. 1st
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Empirical Systems Aerospace, Inc., Oceano, CA www.esaero.com
API/Scripting Integration
• S-3 Viking Script Included with public release
– Example of how to change parameters and run Parasite
Drag analysis
• User has full access to all UI inputs through API
– All general options can be called through enumerators
(e.g. CF_TURB_IMPLICIT_KARMAN_SCHOENHERR)
– All table row inputs are found through the parent
geometry
– Or as part of AnalysisMgr
NNX09CC86P SBIR Review, Presented to NASA, July 7th, 2009VSP Workshop 2017 Aug. 30th – Sep. 1st
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Empirical Systems Aerospace, Inc., Oceano, CA www.esaero.com
Unit Tests and Visual Output
• Simple model
creation, analysis run,
option changes are all
tested through the
API
• S-3 Viking Model also
included as test
• All equation data
output to *.csv to be
displayed using
included Matlab script
NNX09CC86P SBIR Review, Presented to NASA, July 7th, 2009VSP Workshop 2017 Aug. 30th – Sep. 1st
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Empirical Systems Aerospace, Inc., Oceano, CA www.esaero.com
Units Tests and Visual Output
NNX09CC86P SBIR Review, Presented to NASA, July 7th, 2009VSP Workshop 2017 Aug. 30th – Sep. 1st
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Empirical Systems Aerospace, Inc., Oceano, CA www.esaero.com
Documentation
• Basic UI and usability
documentation within the
Parasite Drag Tool
• Reference length calculation
methods (body/wing)
• Partial turbulence friction
coefficient method
• Grouping
• Subsurface handling
• All friction coefficient and form
factor equations listed on wiki,
references included
• Visualization of data pulled
from unit tests
NNX09CC86P SBIR Review, Presented to NASA, July 7th, 2009VSP Workshop 2017 Aug. 30th – Sep. 1st
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Empirical Systems Aerospace, Inc., Oceano, CA www.esaero.com
Development Status
• What was presented last year?
– First draft of the Parasite Drag Tool
• What have been the major updates/improvements/fixes?
– Behind the scenes improvement efforts
– Inclusion of Subsurface handling
– Grouping
– Transonic (In development)
• When was it first released?
– Released in OpenVSP 3.12
• Who paid for the effort?
– Funded by AFRL SBIR Phase II
NNX09CC86P SBIR Review, Presented to NASA, July 7th, 2009VSP Workshop 2017 Aug. 30th – Sep. 1st
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Empirical Systems Aerospace, Inc., Oceano, CA www.esaero.com
DEMO/TUTORIAL
NNX09CC86P SBIR Review, Presented to NASA, July 7th, 2009VSP Workshop 2017 Aug. 30th – Sep. 1st
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Empirical Systems Aerospace, Inc., Oceano, CA www.esaero.com
Questions?
NNX09CC86P SBIR Review, Presented to NASA, July 7th, 2009VSP Workshop 2017 Aug. 30th – Sep. 1st
21
Empirical Systems Aerospace, Inc., Oceano, CA www.esaero.com
Contact Information
Bryan Schmidt
NNX09CC86P SBIR Review, Presented to NASA, July 7th, 2009VSP Workshop 2017 Aug. 30th – Sep. 1st
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Empirical Systems Aerospace, Inc., Oceano, CA www.esaero.com
Transonic Drag Rise Tool
• Adds multiple table
options for transonic
drag rise for wing
geometries
• Transonic drag rise
is added to total
drag in main table
tab