A division of Post Processing Cart3D CFD Analyses using Tecplot Chorus August 14 th 2014.

A division of

Post Processing Cart3D CFD Analyses using Tecplot Chorus

August 14th 2014

2Agenda

• Introductions• GoCart/Cart3D Background• Sample Problem 1: A320 Sweeps

– Analysis Setup: Geometry & Flight Conditions– Results– Post-Processing in Chorus: Plotting sweeps

• Sample Problem 2: Surface Deflection– Analysis Setup– Post-Processing in Chorus: Generating Response Surface

Welcome!

• About Tecplot Inc.– Founded in 1981 in Bellevue WA

(Near Seattle)– 50,000 users across the world– 100 Academic Site Licenses

• About Me– UCLA and University of Utah– Mobusho Fellow Osaka University– Post doc at University of WA– 14 first author publications– 100s of talks on Tecplot

4Janet Zhen Bio

• M.S. Mechanical Engineering – Fluid dynamics and biofluidics– Deformation of elastomeric channels

• Desktop Aeronautics– Product Manager for software– Applications Engineer for support

• NASA Ames Research Center– Small Sats for Space Biology– Send E. Coli into space

• Northrop Grumman – CFD analyst for Trident II underwater

missile launching system

5Introduction

Desktop Aeronautics– Founded in 1994 and purchased by Aerion Corporation in 2012– Currently a 12 person company located in Palo Alto, CA– Licensed distributors of NASA’s Cart3D

Analysis Tool Background

• Cart3D is CFD analysis tool developed by NASA Ames

Research Center and the Courant Institute at NYU– Cartesian Euler code that generates mesh for arbitrarily complex geometries

– Scalable and can be run in batch mode

• GoCart is the GUI that wraps around Cart3D executables– Users can import CAD geometry, build a Cartesian volume mesh, run the flow solver,

and view the results in the post processor within minutes

• Typical Applications: – Propulsion-Airframe Integration and Optimization

– Aircraft Conceptual Design

– Extended Formation Flight

– Launch Vehicle Analysis

– Sonic Boom Prediction

– Fly-back Boosters

Effects of Jet-Interaction on Pitch Control of a Launch Abort Vehicle. M. Aftosmis and S. Rogers AIAA 2008-1281.

Cart3D can be used to rapidly generate thousands of analysis cases

7Example Problem 1: A320 Sweeps

• Objective– Analyze Airbus A320 at different Mach and Alpha sweeps to

determine drag polar– Run flow analysis for 0.5<M<0.85 at increments of 0.5 for

3.5<alpha<6.0 at increments of 0.5

8Analysis Setup

• Import A320 step file into GoCart

• Build computational mesh• Run initial analysis to

check out grid and flow solver settings

• Set up sweeps for varying Mach # and Alphas: Total of 80 cases

9Results

• GoCart calculates CD and CL for each case• Tecplot solution files (cutPlanes.dat and Components.i.dat) files are

generated• GoCart plots contours from a single run

10Dropping Results into Chorus

11

A320 Demo

12Example Problem 2: Surface Deflection Study

Objective:

Use GoCart to simulate simple takeoff and landing scenario and characterize response surface of rolling moment at various angles of attack for multiple aileron configurations at low Mach number

13Problem Setup

• Bring in geometry to GoCart and rotate outer aileron• Run alpha sweep at different aileron angles

14

Flap Demo

15

Results Viewed in Chorus

• Kriging model applied to angle of attack and angle of the aileron to visualize Cy

16Questions?

www.desktop.aeroJanet [email protected]

www.tecplot.comDurrell [email protected]

Thank you for joining us!