Numerical investigation of characteristics of pitch and roll damping coefficients for missile models

Download
2012
Kayabaşı, İskander
In this thesis the characteristics of pitch and roll damping coefficients of missile models are investigated by using Computational Fluid Dynamics (CFD) techniques. Experimental data of NACA0012 airfoil, Basic Finner (BF) and Modified Basic Finner (MBF) models are used for validation and verification studies. Numerical computations are performed from subsonic to supersonic flow regimes. Grid refinement and turbulence model selection studies are conducted before starting the dynamic motion simulations. Numerical method of dynamic motion simulation is validated with a 2D NACA0012 airfoil. After the validation of numerical method, forced-oscillation motion is given to the BF and MBF models. In order to get deeper understandings about the characteristics of dynamic pitching and rolling motions, parametric studies are performed. The amplitude and frequency of forced-oscillation motions are investigated one by one. The effects of angle of attacks are also investigated for both pitching and rolling motions. The results of CFD simulations are compared with experimental data obtained from different wind tunnel and free flight tests. It is seen from these comparisons that experimental and numerical results are in good agreement throughout the whole flow regime. In conclusion, the numerical method presented in this study is validated and can be used for the prediction of pitch and roll damping coefficient of any missile configurations.

Suggestions

Investigation of missiles with strake fins and reduction of aerodynamic cross coupling effects by optimization
Usta, Engin; Tuncer, İsmail Hakkı; Department of Aerospace Engineering (2015)
Missiles with very low aspect ratio fins (also called strakes) are generally difficult to model by using engineering level aerodynamic methods and linear theories break due to complex nature of the flow adjacent to the mutual interference of the body and fin. Since fast prediction methods cannot accurately model vortex development along and downstream of very low aspect ratio fins, they have limited success for application to missiles with strake fins. Moreover, there is limited number of CFD studies for in...
Computational and experimental study of high-speed impact of metallic Taylor cylinders
Konokman, H. Emrah; Coruh, M. Murat; Kayran, Altan (Springer Science and Business Media LLC, 2011-08-01)
High-speed impact of metallic Taylor cylinders is investigated computationally and experimentally. On the computational side, a modular explicit finite element hydrocode based on updated Lagrangian formulation is developed. A non-classical contour integration is employed to calculate the nodal forces in the constant strain axisymmetric triangular elements. Cell and nodal averaging of volumetric strain formulations are implemented on different mesh architectures to reduce the incompressibility constraints an...
Application of spring analogy mesh deformation technique in airfoil design optimization
Yang, Yosheph; Özgen, Serkan; Department of Aerospace Engineering (2015)
In this thesis, an airfoil design optimization with Computational Fluid Dynamics (CFD) analysis combined with mesh deformation method is elaborated in detail. The mesh deformation technique is conducted based on spring analogy method. Several improvements and modifications are addressed during the implementation of this method. These enhancements are made so that good quality of the mesh can still be maintained and robustness of the solution can be achieved. The capability of mesh deformation is verified by...
Analysis, design and test of a jet vane based thrust vector control for tactical missiles
Eren, Oğuz; Eyi, Sinan; Department of Aerospace Engineering (2017)
In this thesis, a design effort for a jet vane based Thrust Vector Control (TVC) in the scope of mechanical design, computational analysis and validating test process is executed to be able to find an optimum CFD approach to this kind of work. To do that, a preliminary design phase is initiated with an already optimized geometry which provides an aerodynamic surface to be worked on. After mechanical design approach to the geometry with system requirements, some of the unverified aspects of the design are te...
End effect evaluation in rheological measurement of drilling fluids using Coutte coaxial cylinder viscometer
Gücüyener, I. Hakki; Kök, Mustafa Verşan; Batmaz, Taner (2002-05-01)
This paper demonstrates the order of influence of end effects on the application of a theory to determine and correct the end effects in Couette coaxial cylinder rotational viscometers, which are commonly used for the rheological evaluation of drilling fluids. It is found that higher shear stresses are measured due to end effects and, consequently, this error bearing shear stress-shear rate data leads to unreliable predictions of the rheological parameters. Evaluation of the shear stress-shear rate data obt...
Citation Formats
İ. Kayabaşı, “Numerical investigation of characteristics of pitch and roll damping coefficients for missile models,” M.S. - Master of Science, Middle East Technical University, 2012.