Historicalarchived
Aircraft Weapons Bay Flow Simulation Model
NAVAIR PATUXENT RIVER
An internal aircraft weapons bay, when exposed to freestream flow, experiences an intense aero-acoustic environment in and around the bay with loads as high as 160 to 180 decibels. High acoustic loads significantly reduce the life of aero-structures in the bay and damage sensitive electronic components. These loads disrupt the store separation process by inducing unfavorable moments on the store. Aircraft design engineers have been challenged to develop innovative suppression methods to control the acoustic environment in the weapons bay. Further, control of the aero-acoustic environment surrounding cavities exposed to high-speed flows has been the subject of several recent investigations. CRAFT Tech has developed a Hybrid Reynolds-Averaged Navier-Strokes Large Eddy Simulation (RANS-LES) model for the prediction of weapons bay aero-acoustics. The technology has aided in the design of control systems to minimize dynamic loading on the weapons bay structures and ensure the safe separation of stores for naval platforms.
Applications
- Military and Commercial Significance:
- Compressible and incompressible flow modules, advanced turbulence modeling, Reynolds Stress Models, Two-Equation Models, Large Eddy Simulation Models, & Hybrid RANS-LES models
- Noise reduction device for integration into the F404/414 engines
- CFD integrated optimization technique for the improvement of stern plane performance
- Analyze transport aircraft plumes; prediction of helicopter exhaust plumes in the presence of rotor downwash
- Moving body problems such as store separation applications
- The flexible Hybrid RANS-LES model enables the development of cost-effective control strategies for achieving successful store separation. It helps reduce the dynamic loading on the exposed weapons bay structures, thereby reducing the risks of fatigue-driven structural failure. The CRAFT Tech Hybrid RANS-LES model benefits any flow modeling efforts within the defense community. The basic technology uses a highly efficient parallel, portable, adaptive unstructured Computational Fluid Dynamics (CFD) framework, which permits the simulation of very complex problems. It predicts modes and amplitudes of oscillations, and models the effect of geometric variations for different aircraft without assumptions of simple rectangular bay geometries. The Hybrid RANS-LENS provides greater volume and detail of information, and its full scale simulations take the guess work out of the predictions.
Provenance
- Original
- https://dodtechmatch.com/dod/successstories/view.aspx?id=60054
- Archived copy
- Wayback Machine snapshot
This record was recovered from a public web archive of dodtechmatch.com and is preserved for historical reference. It may be outdated. Not affiliated with the U.S. Department of Defense. Contact details from the original listing have been withheld.