1G. Einarsson / Institute of Aerodynamics and Flow Technology

SIMPACK in Multidisciplinary Use:Aerodynamics/Flight-Mechanics Coupling

Gunnar EinarssonAndreas SchütteBritta SchöningWulf Mönnich

SIMPACKUser Meeting

2001

13. - 14 November, Bad Ischl, Austria

2G. Einarsson / Institute of Aerodynamics and Flow Technology

OUTLINE

• Objectives

• Simulation Modules

• Validation Experiments / Test-Cases

• Simulation Results

• Conclusions and Perspectives

3G. Einarsson / Institute of Aerodynamics and Flow Technology

Objectives• Tool for CFD / Flight-Mechanic Coupled Simulations

• Aim: Numerical Simulation of a Full Fighter Aircraft

X-31

4G. Einarsson / Institute of Aerodynamics and Flow Technology

Simulation Modules: Aerodynamics (CFD)DLR-Tau Code: Finite Volume Scheme for solving Euler/RANS Equations

Tau

Preprocessor

Dual Meshes

Flow Solver

Solution

Adaptation

Primary Mesh- Unstructured Grid / Dual-Mesh Approach- Multigrid Computation

- One- and Two-Equation Turbulence Models - Dual Time-Stepping for Unsteady Cases - Explicit Runge-Kutta Time-Integration Scheme - Central and Upwind Flux-Calculation Schemes - Guided and Free Rigid-Body Motion - Parallelized using MPI

- Local Grid Refinement (steady computations)

5G. Einarsson / Institute of Aerodynamics and Flow Technology

Simulation Modules: Flight Mechanics

Implemented in theMulti-Body Simulation SoftwareSIMPACK

User Defined Capabilities:• Flight-Mechanic Equations

of Motion (1 to 6 DoF)• 2nd Order Runge-Kutta

Time Integration• Trim Function• Communication Interface

6G. Einarsson / Institute of Aerodynamics and Flow Technology

Simulation Modules:Communication Interface (KAPS)

KAPSMotion converts

position data

AerodynamicsTAU-Code

Solver reads motion data, performs calculations

Flight-MechanicsSIMPACK

Modules will be launched (Different Machines)

Integral Forces and Moments

Integral Forces and Moments

Position and Velocity Data

Position and Velocity Data

SIMPACKStarting Work-Flow

7G. Einarsson / Institute of Aerodynamics and Flow Technology

AeroSUM-Model

Experimental surrounding

Validation Experiments

8G. Einarsson / Institute of Aerodynamics and Flow Technology

Field Source

Leading edge adaptation

Test-Cases: AeroSUM Delta-Wing Model

9G. Einarsson / Institute of Aerodynamics and Flow Technology

Test-Cases: NACA0012 3D-Wing / 2D-Airfoil

10G. Einarsson / Institute of Aerodynamics and Flow Technology

φ-10 0 10 20 30 40 50 60 70 80 90 100-0.04

-0.03

-0.02

-0.01

0

0.01

0.02

Mr: 1750Ma = 0.5Θ = 17.7°φ= 44.7°Re = 3.7 Mio

cl

Simulation Results: Free Rolling Delta Wing

Static starting solution

11G. Einarsson / Institute of Aerodynamics and Flow Technology

Simulation Results: Free Rolling Delta Wing

12G. Einarsson / Institute of Aerodynamics and Flow Technology

Simulation Results: NACA0012 2D-Airfoil

13G. Einarsson / Institute of Aerodynamics and Flow Technology

Conclusions

• Coupling of Aerodynamics and Flight-Mechanics is Successful• Free-Pitching Symmetrical Wings Reach the Zero Trim-Condition

• Simulation of Delta-Wing with Movable Flaps (Chimera)• Implementation of Adaptation for Unsteady Cases• Investigations of Turbulence Models• Parallel Processing of all Tau-Modules• Increase the Complexity of the Aircraft Configuration• Implementation of Aeroelasticity (Project SikMa, 2002)

Perspectives