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The MISDL software combines the subsonic and supersonic capabilities of programs SUBDL and SUPDL into a single software package and single input description. In addition, the body modeling in MISDL has been extended so that noncircular body shapes can be modeled, including those with chines.
Fast-running program MISDL employs elements of classical aerodynamic theory, including vortical theory. The software package predicts overall aerodynamic performance coefficients and detailed aerodynamic loading distributions on the body and fins of a missile. The missile finned sections can have planar, triform, cruciform, and low profile fin layouts. Fin planform can be arbitrary. Effects of rotational rates and of nonuniform flow are included. The overall and detailed aerodynamics predicted by these programs are useful to aerodynamic, structural, and control system engineers. The software packages include a postprocessor for generating aerodynamic forces for input to structural analysis program NASTRAN. The prediction programs are not limited to missile configurations; aircraft aerodynamic performance coefficients can also be determined.
| Range of Flow Parameters |
Subsonic - supersonic Mach number
(fin loads valid to Mach 6.0) |
| Angles of attack up to 30 deg |
| Roll angle arbitrary |
| Fin control deflection angles to 20 deg |
| Important Modeling Features |
| Nonlinear effects of body and fin vortices |
| Damping effects due to rotational rates (p,q,r) |
| Effects of user-specified nonuniform flow |
| Applicable Configurations |
| Up to 2 fin sections |
1, 2, 3, or 4 fins per fin section
Arbitrary attachment and dihedral angles |
| Arbitrary fin planform shape |
| Aerodynamic Quantities Computed |
Overall 6-DOF forces and moments:
axial, side, and normal forces
rolling, pitching, and yawing moments |
Fin forces and moments:
fin axial and normal forces
fin hinge and bending moments |
| Body pressure distribution |
| Fin load distributions |
| Detailed axial force breakdown |
| Output Options |
| Detailed output file |
| Amtec TECPLOT compatible files |
| Spreadsheet compatible files |
As an option, MISDL can be linked with the NEAR store separation program STRLNCH for detailed aerodynamic analysis of store carriage loads and trajectories.
MISDL is available for most workstation computers subject to license fees and a software license agreement. Delivery to foreign contries requires U.S. State Department export license. NEAR recommends a two-day training course which includes interpretation of the output and "hands-on" code running.
References
- Control of Hinge Moment by Tailoring Fin Structure and Planform - with M. F. E. Dillenius, J. F. Love and S. C. Perkins, Jr., NEAR TR 530, December 1997.
- Missile Fin Planform Optimization for Improved Performance - with M. F. E. Dillenius and T. O. Lesieutre, Presented at AGARD 82nd Fluid Dynamics Panel Symposium on Missile Aerodynamics, Sorrento, Italy, May 1998.
- Engineering, Intermediate, and High Level Aerodynamic Prediction Methods and Applications - with M. F. E. Dillenius, M. C. Hegedus, S. C. Perkins, Jr., J. F. Love, and T. O. Lesieutre, AIAA Paper 97 2278, June 1997. Presented at AIAA Conference, Atlanta, GA, June 1997.
- Optimal Aerodynamic Design of Advanced Missile Configurations with Geometric and Structural Constraints - with T. O. Lesieutre and M. F. E Dillenius, NEAR TR 520, April 1997.
- Planform/Configuration Optimization Program OPTMIS for Arbitrary Cross Section Configurations With Up To Two Fin Sets, Software User's Manual and Software Programmer's Manual - with T. O. Lesieutre and M. F. E. Dillenius, NEAR TR 519, April 1997.
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