Experimental and Numerical Investigation of the Flow Topology During Airdrop Operations

This paper reviews experimental and numerical simulations of the dropping of simplified cargo supplies from a generic military transport aircraft carried out at DLR. Aiming at developing a well-validated process chain to accurately compute the trajectories and attitudes of airdropped cargo supplies in the proximate vicinity of the aircraft, extensive low-speed wind tunnel tests were conducted as a means to validate the numerical simu- lation. A simulation environment was established, coupling unsteady Navier-Stokes CFD methods with multi-body simulation methods, allowing for the precise computation of the time-dependent aerodynamic and ight mechanic behaviour of an airdropped supply. A comparison of selected results between the numerically simulated airdrop and the wind tunnel data is presented.

[1]  S. Dash,et al.  Aerodynamics of multi-body separation using adaptive unstructured grids , 2000 .

[2]  Niko Schade,et al.  Simulation of Trajectories of Cuboid Cargos Released from a Generic Transport Aircraft , 2011 .

[3]  W. F. Phillips,et al.  Review of Attitude Representations Used for Aircraft Kinematics , 2001 .

[4]  Robert Tomaro,et al.  An Overset Unstructured Grid Methodology Applied to a C-130 with a Cargo Pallet and Extraction Parachute , 2006 .

[5]  R. Heinrich,et al.  Fluid-Structure Coupling Using CFD and Multibody Simulation Methods , 2002 .

[6]  Scott M. Murman,et al.  Simulations of 6-DOF Motion with a Cartesian Method , 2003 .

[7]  Kenneth Desabrais.  The Motion and Aerodynamics of an Airdrop Platform , 2004 .

[8]  Richard Benney,et al.  Comparison of Numerical Flow Field Predictions for Army Airdrop Systems , 1999 .

[9]  Jean Potvin,et al.  Simulating the Flows About Cargo Containers Used During Parachute Airdrop Operations , 2011 .

[10]  Joseph D. Baum,et al.  Three-dimensional store separation using a finite element solver and adaptive remeshing , 1991 .

[11]  Thomas Gerhold,et al.  Overview of the Hybrid RANS Code TAU , 2005 .

[12]  Andreas Bergmann,et al.  Capabilities of Deployment Tests at DNW-NWB , 2006 .

[13]  A. Madrane.  Parallel Implementation of a Dynamic Overset Unstructured Grid Approach , 2006 .

[14]  A. Bergmann.  Modern Wind Tunnel Techniques for Unsteady Testing – Development of Dynamic Test Rigs , 2009 .

[15]  A. Jameson,et al.  Numerical solution of the Euler equations by finite volume methods using Runge Kutta time stepping schemes , 1981 .

[16]  Kenneth J. Desabrais,et al.  Aerodynamic Forces on an Airdrop Platform , 2005 .

[17]  Stephan Priebe,et al.  Computer Simulation of Paratrooper Deployment by Static Line from A400M , 2006 .

[18]  David W. Roberts,et al.  Separation Flight Tests of a Small Unmanned Air Vehicle from a C-130 Transport Aircraft , 2005 .