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NNX09CC86P SBIR Review, Presented to NASA, July 7th, 2009OpenVSP Workshop 2017 Aug. 30th – Sep. 1st

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Empirical Systems Aerospace, Inc. www.esaero.com

OpenVSP & VSPAERO

GUI Advanced

Presented by:

Nick Brake

Empirical Systems Aerospace, Inc.


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Agenda

• Introduction

• VSPAERO Advanced Options

• Tessellation

• Control Surfaces & Grouping

• Rotor Disks

• Panel Method

• Hands-on Walkthrough


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GUI – Advanced Tab (1/2)

Case Setup

• Filename override

• Num CPU – OpenMP thread count, set this to

the number of physical cores

• Batch calculation– OFF: immediate results plotting

– ON: Minor speed improvement and

ability to step through cases in

VSPViewer

• Jacobi Pre-conditioner– robustness & speed improvement

• X-Z symmetry – 2x speed improvement for

symmetric cases

• Write 2D FEM– outputs *.fem file for structural

calculations (e.g. Beam3D)


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GUI – Advanced Tab(2/2)

Other

• Clmax, Max Turning Angle– Coarse methods to globally limit

the lift from the inviscid solution

• Far Field Dist. – Ability to set distance to freestream

Unsteady

• Stability Calculation– Enable finite differencing for aero

coeff derivatives

– Num cases = 7+ ncontrols

• Additional unsteady

specification for single axis

unsteady p, q, r derivatives


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Tessellation

• Wing

– Defaults clustering at

LE/TE (0.25)

– Chordwise: “Plan” tab

– Spanwise: “Sect” tab

• Fuselage

– Skining drives

tessellation clustering


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GUI – Control Groups

User Groups

• Groups are analogous to control

“channels” that can deflect

multiple surfaces

• User defined or auto

Available Control Surfaces

• Surfaces that are available to

group

• There is a surface for each

reflected geometry

Control Surf. Group Details

• Location to edit the group

• Can edit individual surface gains

to get desired deflection

Auto Group EASY Button


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GUI – Control Grouping Workflow

1. Add a control surfaces

2. VSPAERO GUI Control

Grouping Tab

3. Add new group

4. Rename group [Optional]

5. Select Surfaces

6. Click “Add Selected”

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6. Click surface to highlight on

geometry

7. Set deflection gains as

needed

8. Set Deflection on Overview

Tab

9. Launch Solver

10. Check lift distribution for

expected results

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GUI – Rotor Disks

Rotor Disk Element Settings

• REQUIRES a “Disk” component

• Lists all disk settings in the

model

• Vinf, rho apply to all rotors

• All other params are rotor

specific


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Panel Method - Setup

Case Setup (Panel Method)

• Preview VLM Geometry

disabled

Control Group Deflections

• Deflections ignored for panel

method


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Known Issues

• VSPAERO only finds the first

control surface definition on a

wing

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Hands On

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